always return content type application/json

- Reset the app idle timer when interacting with the webapp, so that the
  device does not turn off while the web ui is used.

- Handle denying put/post while playback is active centrally in the
  before_request handler, so that it does not need to be copy/pasted
  into every request handler.

Signed-off-by: Matthias Blankertz <matthias@blankertz.org>

.gitea/workflows/build.yaml

@@ -17,9 +17,9 @@ jobs:
         uses: actions/upload-artifact@v3
         with:
           name: firmware-RPi-Pico-W
-          path: software/lib/micropython/ports/rp2/build-TONBERRY_RPI_PICO_W/firmware.uf2
+          path: software/build/firmware-*.uf2
       - name: Upload firmware w/ filesystem
         uses: actions/upload-artifact@v3
         with:
           name: firmware-RPi-Pico-W-with-fs
-          path: software/lib/micropython/ports/rp2/build-TONBERRY_RPI_PICO_W/firmware-filesystem-*.uf2
+          path: software/build/firmware-filesystem-*.uf2

DEVELOP.md

@@ -9,3 +9,46 @@ python -m venv test-venv
 pip install -r tests/requirements.txt
 pip install -U micropython-rp2-pico_w-stubs --target typings
 ```
+
+
+## 'database' schema for btree db
+
+### Playlist storage
+
+The playlist data is stored in the btree database in a hierarchical schema. The hierarchy levels are
+separated by the '/' character.  Currently, the schema is as follows: The top level for a playlist
+is the 'tag' id encoded as a hexadecimal string. Beneath this, the 'playlist' key contains the
+elements in the playlist. The keys used for the playlist entries must be decimal integers,
+left-padded with zeros so their length is 5 (e.g. format `{:05}`).
+
+#### Playlist modes
+
+The 'playlistshuffle' key located under the 'tag' key can be 'no' or 'yes' and specifies whether the
+playlist is in shuffle mode. Should this key be absent the default value is 'no'.
+
+The 'playlistpersist' key located under the 'tag' key can be 'no', 'track' or 'offset'. Should this
+key be absent the default value is 'track'.
+
+ * When it is 'no', the playlist position is not saved when playback stops. If shuffle mode is
+   active, the shuffle random seed is also not saved.
+ * When it is 'track', the currently playing track is saved when playback stops. If shuffle mode is
+   active, the shuffle random seed is also saved. Should playback reach the last track (in shuffle
+   mode: the last track in the permutated order), the saved position is reset and playback is
+   stopped. The next time the playlist is started it will start from the first track and with a new
+   shuffle seed if applicable.
+ * When it is 'offset', the operation is basically the same as in 'track' mode. The difference is
+   that the offset in the currently playing track is also saved and playback will resume at that
+   position.
+
+The 'playlistpos' key located under the 'tag' key stores the key of the current playlist
+entry. The 'playlistshuffleseed' key stores the random seed used to shuffle the playlist.
+The 'playlistposoffset' key stores the offset in the current playlist entry.
+
+#### Example
+
+For example, a playlist with two entries 'a.mp3' and 'b.mp3' for a tag with the id '00aa11bb22'
+would be stored in the following key/value pairs in the btree db:
+
+ * 00aa11bb22/playlist/00000: a.mp3
+ * 00aa11bb22/playlist/00001: b.mp3
+ * 00aa11bb22/playlistpos: 00000

hardware/tonberry-pico/tonberry-pico.kicad_dru

@@ -5,18 +5,18 @@
 	(condition "A.Type == 'pad' && (B.Type == 'text' || B.Type == 'graphic')"))
 
 (rule "drill hole size (mechanical)"
-	(constraint hole_size (min 0.3mm) (max 6.3mm)))
+	(constraint hole_size (min 0.2mm) (max 6.3mm)))
 
 (rule "Minimum Via Hole Size"
-	(constraint hole_size (min 0.3mm))
+	(constraint hole_size (min 0.2mm))
 	(condition "A.Type == 'via'"))
 
 (rule "Minimum Via Diameter"
-	(constraint via_diameter (min 20mil))
+	(constraint via_diameter (min 0.35mm))
 	(condition "A.Type == 'via'"))
 
 (rule "PTH Hole Size"
-	(constraint hole_size (min 12mil) (max 6.35mm))
+	(constraint hole_size (min 0.2mm) (max 6.35mm))
 	(condition "A.isPlated()"))
 
 (rule "Minimum Non-plated Hole Size"
@@ -24,5 +24,5 @@
 	(condition "A.Type == 'pad' && !A.isPlated()"))
 
 (rule "Pad to Track clearance"
-	(constraint clearance (min 0.2mm))
-	(condition "A.isPlated() && A.Type != 'Via' && B.Type == 'track'"))
+	(constraint clearance (min 0.1mm))
+	(condition "A.isPlated() && A.Type != 'Via' && B.Type == 'track'"))

hardware/tonberry-pico/tonberry-pico.kicad_prl

@@ -1,6 +1,6 @@
 {
   "board": {
-    "active_layer": 5,
+    "active_layer": 0,
     "active_layer_preset": "",
     "auto_track_width": true,
     "hidden_netclasses": [],
@@ -18,17 +18,17 @@
       "zones": 0.6
     },
     "selection_filter": {
-      "dimensions": true,
-      "footprints": true,
+      "dimensions": false,
+      "footprints": false,
       "graphics": true,
-      "keepouts": true,
+      "keepouts": false,
       "lockedItems": false,
-      "otherItems": true,
-      "pads": true,
+      "otherItems": false,
+      "pads": false,
       "text": true,
       "tracks": true,
       "vias": true,
-      "zones": true
+      "zones": false
     },
     "visible_items": [
       "vias",
@@ -51,7 +51,7 @@
       "conflict_shadows",
       "shapes"
     ],
-    "visible_layers": "00000000_00000000_0fffffff_ffffffff",
+    "visible_layers": "00000000_00000000_0ffffff7_ffffffff",
     "zone_display_mode": 0
   },
   "git": {

hardware/tonberry-pico/tonberry-pico.kicad_pro

@@ -37,9 +37,9 @@
         "other_text_thickness": 0.15,
         "other_text_upright": false,
         "pads": {
-          "drill": 3.2,
-          "height": 3.2,
-          "width": 3.2
+          "drill": 0.8,
+          "height": 1.6,
+          "width": 1.6
         },
         "silk_line_width": 0.1,
         "silk_text_italic": false,
@@ -48,7 +48,7 @@
         "silk_text_thickness": 0.1,
         "silk_text_upright": false,
         "zones": {
-          "min_clearance": 0.0
+          "min_clearance": 0.4064
         }
       },
       "diff_pair_dimensions": [
@@ -60,31 +60,11 @@
       ],
       "drc_exclusions": [
         [
-          "items_not_allowed|117348000|131000000|4c513f4f-0c90-4a64-b2d1-bf0189c761db|00000000-0000-0000-0000-000000000000",
+          "lib_footprint_mismatch|148587019|59126370|4f17c230-1bc1-45e3-8816-9cf9d13e3a5c|00000000-0000-0000-0000-000000000000",
           ""
         ],
         [
-          "items_not_allowed|117348000|131000000|fea7aba8-73c4-4553-8cc8-83472c47a83b|00000000-0000-0000-0000-000000000000",
-          ""
-        ],
-        [
-          "items_not_allowed|122420000|136975000|8ffc6a0d-806e-4b99-922f-2baead2bd98b|00000000-0000-0000-0000-000000000000",
-          ""
-        ],
-        [
-          "items_not_allowed|148270000|136975000|804b9d74-91fa-4f75-bc54-8f55b801562f|00000000-0000-0000-0000-000000000000",
-          ""
-        ],
-        [
-          "items_not_allowed|148720706|136551802|f2c1e20e-a272-42d8-a551-3e9074b96921|00000000-0000-0000-0000-000000000000",
-          ""
-        ],
-        [
-          "nonmirrored_text_on_back_layer|210811000|131073000|e87ca627-5327-4f7e-ac1a-c1eadd662c0a|00000000-0000-0000-0000-000000000000",
-          ""
-        ],
-        [
-          "silk_overlap|115550000|131000000|cd433b4c-40ac-48cc-b03e-5acf3357d88b|fea7aba8-73c4-4553-8cc8-83472c47a83b",
+          "nonmirrored_text_on_back_layer|213233000|81790000|e87ca627-5327-4f7e-ac1a-c1eadd662c0a|00000000-0000-0000-0000-000000000000",
           ""
         ]
       ],
@@ -153,22 +133,22 @@
       },
       "rules": {
         "max_error": 0.005,
-        "min_clearance": 0.2032,
+        "min_clearance": 0.15,
         "min_connection": 0.0,
         "min_copper_edge_clearance": 0.2,
         "min_groove_width": 0.0,
         "min_hole_clearance": 0.35,
-        "min_hole_to_hole": 0.45,
+        "min_hole_to_hole": 0.2,
         "min_microvia_diameter": 0.2,
         "min_microvia_drill": 0.1,
         "min_resolved_spokes": 2,
         "min_silk_clearance": 0.0,
         "min_text_height": 1.0,
         "min_text_thickness": 0.15,
-        "min_through_hole_diameter": 0.3,
-        "min_track_width": 0.2032,
+        "min_through_hole_diameter": 0.2,
+        "min_track_width": 0.15,
         "min_via_annular_width": 0.15,
-        "min_via_diameter": 0.5,
+        "min_via_diameter": 0.35,
         "solder_mask_to_copper_clearance": 0.005,
         "use_height_for_length_calcs": true
       },
@@ -280,7 +260,12 @@
     "equivalence_files": []
   },
   "erc": {
-    "erc_exclusions": [],
+    "erc_exclusions": [
+      [
+        "pin_to_pin|1549400|977900|f11a46f2-13fb-4d63-9b53-b032e49a375d|4b6603d6-e95b-4131-942b-96ddc8a9a606|/7226ca0f-138a-46b4-89f3-dc32dfb1f9f7|/7226ca0f-138a-46b4-89f3-dc32dfb1f9f7|/7226ca0f-138a-46b4-89f3-dc32dfb1f9f7",
+        "Raspberry Pi Pico W Datasheet p. 9:  If the ADC is not used or ADC performance is not critical, this pin can be connected to digital ground."
+      ]
+    ],
     "meta": {
       "version": 0
     },
@@ -468,9 +453,9 @@
       "extra_units": "error",
       "footprint_filter": "ignore",
       "footprint_link_issues": "warning",
-      "four_way_junction": "ignore",
+      "four_way_junction": "warning",
       "global_label_dangling": "warning",
-      "hier_label_mismatch": "error",
+      "hier_label_mismatch": "warning",
       "label_dangling": "error",
       "label_multiple_wires": "warning",
       "lib_symbol_issues": "warning",
@@ -485,14 +470,14 @@
       "no_connect_dangling": "warning",
       "pin_not_connected": "error",
       "pin_not_driven": "error",
-      "pin_to_pin": "warning",
+      "pin_to_pin": "error",
       "power_pin_not_driven": "error",
       "same_local_global_label": "warning",
       "similar_label_and_power": "warning",
       "similar_labels": "warning",
       "similar_power": "warning",
       "simulation_model_issue": "ignore",
-      "single_global_label": "ignore",
+      "single_global_label": "warning",
       "unannotated": "error",
       "unconnected_wire_endpoint": "warning",
       "undefined_netclass": "error",

software/boards/RPI_PICO_W/manifest-Rev1.py

@@ -0,0 +1,3 @@
+include("manifest.py")
+
+module("hwconfig.py", "../../src/hwconfig_Rev1")

software/boards/RPI_PICO_W/manifest-breadboard.py

@@ -0,0 +1,3 @@
+include("manifest.py")
+
+module("hwconfig.py", "../../src/hwconfig_breadboard")

software/boards/RPI_PICO_W/manifest.py

@@ -15,3 +15,10 @@ module("microdot.py", "../../lib/microdot/src/microdot/")
 # TonberryPico modules
 module("audiocore.py", "../../modules/audiocore")
 module("rp2_neopixel.py", "../../modules")
+
+module("main.py", "../../src")
+module("app.py", "../../src")
+module("mp3player.py", "../../src")
+module("webserver.py", "../../src")
+package("utils", base_path="../../src")
+package("nfc", base_path="../../src")

software/boards/RPI_PICO_W/mpconfigboard.h

@@ -25,3 +25,12 @@ int mp_hal_is_pin_reserved(int n);
 #define MICROPY_HW_PIN_RESERVED(i) mp_hal_is_pin_reserved(i)
 
 #define MICROPY_PY_THREAD (0)
+
+#define TONBERRY_POWER_EN 22
+
+#define MICROPY_BOARD_STARTUP()                \
+    {                                          \
+        gpio_init(TONBERRY_POWER_EN);          \
+        gpio_set_dir(TONBERRY_POWER_EN, true); \
+        gpio_put(TONBERRY_POWER_EN, true);     \
+    }

software/boards/tonberry_unix/manifest.py

@@ -0,0 +1,5 @@
+include("$(PORT_DIR)/variants/manifest.py")
+
+include("$(MPY_DIR)/extmod/asyncio")
+
+module("microdot.py", "../../lib/microdot/src/microdot/")

software/boards/tonberry_unix/mpconfigvariant.h

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// Set base feature level.
+#define MICROPY_CONFIG_ROM_LEVEL (MICROPY_CONFIG_ROM_LEVEL_EXTRA_FEATURES)
+
+// Enable extra Unix features.
+#include "mpconfigvariant_common.h"

software/boards/tonberry_unix/mpconfigvariant.mk

@@ -0,0 +1,3 @@
+# This is the default variant when you `make` the Unix port.
+
+FROZEN_MANIFEST ?= $(VARIANT_DIR)/manifest.py

software/boards/tonberry_unix/mpconfigvariant_common.h

@@ -0,0 +1,126 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Jim Mussared
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// This file enables and configures features common to all variants
+// other than "minimal".
+
+// Send raise KeyboardInterrupt directly from the signal handler rather than
+// scheduling it into the VM.
+#define MICROPY_ASYNC_KBD_INTR         (!MICROPY_PY_THREAD_GIL)
+
+// Enable helpers for printing debugging information.
+#ifndef MICROPY_DEBUG_PRINTERS
+#define MICROPY_DEBUG_PRINTERS         (1)
+#endif
+
+// Enable floating point by default.
+#ifndef MICROPY_FLOAT_IMPL
+#define MICROPY_FLOAT_IMPL             (MICROPY_FLOAT_IMPL_DOUBLE)
+#endif
+
+// Don't use native _Float16 because it increases code size by a lot.
+#ifndef MICROPY_FLOAT_USE_NATIVE_FLT16
+#define MICROPY_FLOAT_USE_NATIVE_FLT16 (0)
+#endif
+
+// Enable arbitrary precision long-int by default.
+#ifndef MICROPY_LONGINT_IMPL
+#define MICROPY_LONGINT_IMPL           (MICROPY_LONGINT_IMPL_MPZ)
+#endif
+
+// Enable use of C libraries that need read/write/lseek/fsync, e.g. axtls.
+#define MICROPY_STREAMS_POSIX_API      (1)
+
+// REPL conveniences.
+#define MICROPY_REPL_EMACS_WORDS_MOVE  (1)
+#define MICROPY_REPL_EMACS_EXTRA_WORDS_MOVE (1)
+#define MICROPY_USE_READLINE_HISTORY   (1)
+#ifndef MICROPY_READLINE_HISTORY_SIZE
+#define MICROPY_READLINE_HISTORY_SIZE  (50)
+#endif
+
+// Seed random on import.
+#define MICROPY_PY_RANDOM_SEED_INIT_FUNC (mp_random_seed_init())
+
+// Allow exception details in low-memory conditions.
+#define MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF (1)
+#define MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE (256)
+
+// Allow loading of .mpy files.
+#define MICROPY_PERSISTENT_CODE_LOAD   (1)
+
+// Extra memory debugging.
+#define MICROPY_MALLOC_USES_ALLOCATED_SIZE (1)
+#define MICROPY_MEM_STATS              (1)
+
+// Enable a small performance boost for the VM.
+#define MICROPY_OPT_COMPUTED_GOTO      (1)
+
+// Return number of collected objects from gc.collect().
+#define MICROPY_PY_GC_COLLECT_RETVAL   (1)
+
+// Enable detailed error messages and warnings.
+#define MICROPY_ERROR_REPORTING     (MICROPY_ERROR_REPORTING_DETAILED)
+#define MICROPY_WARNINGS               (1)
+#define MICROPY_PY_STR_BYTES_CMP_WARN  (1)
+
+// Configure the "sys" module with features not usually enabled on bare-metal.
+#define MICROPY_PY_SYS_ATEXIT          (1)
+#define MICROPY_PY_SYS_EXC_INFO        (1)
+
+// Configure the "os" module with extra unix features.
+#define MICROPY_PY_OS_INCLUDEFILE      "ports/unix/modos.c"
+#define MICROPY_PY_OS_ERRNO            (1)
+#define MICROPY_PY_OS_GETENV_PUTENV_UNSETENV (1)
+#define MICROPY_PY_OS_SYSTEM           (1)
+#define MICROPY_PY_OS_URANDOM          (1)
+
+// Enable the unix-specific "time" module.
+#define MICROPY_PY_TIME                (1)
+#define MICROPY_PY_TIME_TIME_TIME_NS   (1)
+#define MICROPY_PY_TIME_CUSTOM_SLEEP   (1)
+#define MICROPY_PY_TIME_INCLUDEFILE    "ports/unix/modtime.c"
+
+#if MICROPY_PY_SSL
+#define MICROPY_PY_HASHLIB_MD5         (1)
+#define MICROPY_PY_HASHLIB_SHA1        (1)
+#define MICROPY_PY_CRYPTOLIB           (1)
+#endif
+
+// The "select" module is enabled by default, but disable select.select().
+#define MICROPY_PY_SELECT_POSIX_OPTIMISATIONS (1)
+#define MICROPY_PY_SELECT_SELECT       (0)
+
+// Enable the "websocket" module.
+#define MICROPY_PY_WEBSOCKET           (1)
+
+// Enable the "machine" module, mostly for machine.mem*.
+#define MICROPY_PY_MACHINE             (1)
+#define MICROPY_PY_MACHINE_PULSE       (1)
+#define MICROPY_PY_MACHINE_PIN_BASE    (1)
+
+#define MICROPY_VFS_ROM                (1)
+#define MICROPY_VFS_ROM_IOCTL          (0)

software/build.sh

@@ -6,40 +6,55 @@ set -eu
 
 ( cd lib/micropython
   make -C mpy-cross -j "$(nproc)"
-  make -C ports/rp2 BOARD=TONBERRY_RPI_PICO_W BOARD_DIR="$TOPDIR"/boards/RPI_PICO_W clean
-  make -C ports/rp2 BOARD=TONBERRY_RPI_PICO_W BOARD_DIR="$TOPDIR"/boards/RPI_PICO_W \
-       USER_C_MODULES="$TOPDIR"/modules/micropython.cmake -j "$(nproc)"
+
+  # build tonberry specific unix port of micropython
+  make -C ports/unix VARIANT_DIR="$TOPDIR"/boards/tonberry_unix clean
+  make -C ports/unix VARIANT_DIR="$TOPDIR"/boards/tonberry_unix -j "$(nproc)"
 )
 
 ( cd tools/mklittlefs
   make -j "$(nproc)"
 )
 
-PICOTOOL=picotool
-if ! command -v $PICOTOOL >/dev/null 2>&1; then
-    echo "system picotool not found, checking SDK build dir"
-    PICOTOOL=lib/micropython/ports/rp2/build-TONBERRY_RPI_PICO_W/_deps/picotool-build/picotool
-    if ! command -v $PICOTOOL >/dev/null 2>&1; then
-       echo "No picotool found, exiting"
-       exit 1
-    fi
-fi
 BUILDDIR=lib/micropython/ports/rp2/build-TONBERRY_RPI_PICO_W/
+BUILDDIR_UNIX=lib/micropython/ports/unix/build-tonberry_unix/
+OUTDIR=$(pwd)/build
+mkdir -p "$OUTDIR"
 FS_STAGE_DIR=$(mktemp -d)
+mkdir  "$FS_STAGE_DIR"/fs
 trap 'rm -rf $FS_STAGE_DIR' EXIT
-for hwconfig in src/hwconfig_*.py; do
+tools/mklittlefs/mklittlefs -p 256 -s 868352 -c "$FS_STAGE_DIR"/fs "$FS_STAGE_DIR"/filesystem.bin
+
+for hwconfig in boards/RPI_PICO_W/manifest-*.py; do
     hwconfig_base=$(basename "$hwconfig")
-    hwname=${hwconfig_base##hwconfig_}
+    hwname=${hwconfig_base##manifest-}
     hwname=${hwname%%.py}
-    find src/ -iname '*.py' \! -iname 'hwconfig_*.py' | cpio -pdm "$FS_STAGE_DIR"
-    cp "$hwconfig" "$FS_STAGE_DIR"/src/hwconfig.py
-    tools/mklittlefs/mklittlefs -p 256 -s 868352 -c "$FS_STAGE_DIR"/src $BUILDDIR/filesystem.bin
+    hwconfig_abs=$(realpath "$hwconfig")
+    ( cd lib/micropython
+      make -C ports/rp2 BOARD=TONBERRY_RPI_PICO_W BOARD_DIR="$TOPDIR"/boards/RPI_PICO_W clean
+      make -C ports/rp2 BOARD=TONBERRY_RPI_PICO_W BOARD_DIR="$TOPDIR"/boards/RPI_PICO_W \
+           USER_C_MODULES="$TOPDIR"/modules/micropython.cmake \
+           FROZEN_MANIFEST="$hwconfig_abs" -j "$(nproc)"
+    )
+    PICOTOOL=picotool
+    if ! command -v $PICOTOOL >/dev/null 2>&1; then
+        echo "system picotool not found, checking SDK build dir"
+        PICOTOOL=lib/micropython/ports/rp2/build-TONBERRY_RPI_PICO_W/_deps/picotool-build/picotool
+        if ! command -v $PICOTOOL >/dev/null 2>&1; then
+            echo "No picotool found, exiting"
+            exit 1
+        fi
+    fi
     truncate -s 2M $BUILDDIR/firmware-filesystem.bin
     dd if=$BUILDDIR/firmware.bin of=$BUILDDIR/firmware-filesystem.bin bs=1k
-    dd if=$BUILDDIR/filesystem.bin of=$BUILDDIR/firmware-filesystem.bin bs=1k seek=1200
-    $PICOTOOL uf2 convert $BUILDDIR/firmware-filesystem.bin $BUILDDIR/firmware-filesystem-"$hwname".uf2
-    rm -r "${FS_STAGE_DIR:?}"/*
+    dd if="$FS_STAGE_DIR"/filesystem.bin of=$BUILDDIR/firmware-filesystem.bin bs=1k seek=1200
+    cp $BUILDDIR/firmware.uf2 "$OUTDIR"/firmware-"$hwname".uf2
+    $PICOTOOL uf2 convert $BUILDDIR/firmware-filesystem.bin "$OUTDIR"/firmware-filesystem-"$hwname".uf2
 done
 
-echo "Output in $BUILDDIR/firmware.uf2"
-echo "Images with filesystem in" ${BUILDDIR}firmware-filesystem-*.uf2
+cp "$BUILDDIR_UNIX"/micropython "$OUTDIR"/micropython-tonberry_unix
+chmod u+x "$OUTDIR"/micropython-tonberry_unix
+
+echo "Output in" "${OUTDIR}"/firmware-*.uf2
+echo "Images with filesystem in" "${OUTDIR}"/firmware-filesystem-*.uf2
+echo "Unix build in" "${OUTDIR}"/micropython-tonberry_unix

software/flash.sh

@@ -2,6 +2,8 @@
 
 set -eu
 
+TOPDIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
 check_command()
 {
     name=$1
@@ -16,7 +18,7 @@ check_command lsusb
 check_command picotool
 
 DEVICEPATH=/dev/disk/by-label/RPI-RP2
-IMAGEPATH=lib/micropython/ports/rp2/build-TONBERRY_RPI_PICO_W/
+IMAGEPATH=${TOPDIR}/build
 REVISION=Rev1
 
 flash_via_mountpoint()
@@ -41,7 +43,7 @@ flash_via_picotool()
     local device="${bus_device[1]//[!0-9]/}"
     echo "Found RP2 with serial $serial on Bus $bus Device $device"
     
-    picotool load --bus "$bus" --address "$device" "$IMAGEFILE"
+    picotool load --update --bus "$bus" --address "$device" "$IMAGEFILE"
 }
 
 FLASH_VIA_MOUNTPOINT=0
@@ -83,7 +85,7 @@ if [ $# -gt 0 ]; then
     usage
 fi
 
-IMAGEFILE="$IMAGEPATH"/firmware-filesystem-$REVISION.uf2
+IMAGEFILE="$IMAGEPATH"/firmware-$REVISION.uf2
 
 if [ "$FLASH_VIA_MOUNTPOINT" -eq 0 ]; then
     flash_via_picotool

software/modules/audiocore/i2s.c

@@ -91,19 +91,21 @@ void i2s_stop(void)
 {
     if (!i2s_context.playback_active)
         return;
-    bool have_data = false;
-    do {
+    while (true) {
         const long flags = save_and_disable_interrupts();
         const int next_buf = (i2s_context.cur_playing + 1) % AUDIO_BUFS;
-        have_data = i2s_context.has_data[next_buf];
+        const bool have_data = i2s_context.has_data[next_buf];
+        if (!have_data) {
+            i2s_context.playback_active = false;
+            shared_context.underruns = 0;
+            restore_interrupts(flags);
+            break;
+        }
+        __wfi();
         restore_interrupts(flags);
-        if (have_data)
-            __wfi();
-    } while (have_data);
-    const long flags = save_and_disable_interrupts();
-    i2s_context.playback_active = false;
-    shared_context.underruns = 0;
-    restore_interrupts(flags);
+        __nop(); // Ensure at least two instructions between enable interrupts and subsequent disable
+        __nop();
+    }
     // Workaround rp2040 E13
     dma_channel_set_irq1_enabled(i2s_context.dma_ch, false);
     dma_channel_abort(i2s_context.dma_ch);

software/modules/rp2_sd/sd.c

@@ -130,57 +130,62 @@ static void sd_dump_cid [[maybe_unused]] (void)
 static bool sd_read_csd(struct sd_context *sd_context)
 {
     uint8_t buf[16];
-    if (sd_cmd_read(9, 0, 16, buf)) {
-        const uint8_t crc = sd_crc7(15, buf);
-        const uint8_t card_crc = buf[15] >> 1;
-        if (card_crc != crc) {
-            printf("CRC mismatch: Got %02hhx, expected %02hhx\n", card_crc, crc);
-            // Some cheap SD cards always report CRC=0, don't fail in that case
-            if (card_crc != 0) {
-                return false;
-            }
-        }
-        const unsigned csd_ver = buf[0] >> 6;
-        unsigned blocksize [[maybe_unused]] = 0;
-        unsigned blocks = 0;
-        unsigned version [[maybe_unused]] = 0;
-        switch (csd_ver) {
-        case 0: {
-            if (sd_context->sdhc_sdxc) {
-                printf("sd_init: Got CSD v1.0 but card is SDHC/SDXC?\n");
-                return false;
-            }
-            const unsigned read_bl_len = buf[5] & 0xf;
-            if (read_bl_len < 9 || read_bl_len > 11) {
-                printf("Invalid read_bl_len in CSD 1.0\n");
-                return false;
-            }
-            blocksize = 1 << (buf[5] & 0xf);
-            const unsigned c_size_mult = (buf[9] & 0x1) << 2 | (buf[10] & 0xc0) >> 6;
-            const unsigned c_size = (buf[6] & 0x3) << 10 | (buf[7] << 2) | (buf[8] & 0xc0) >> 6;
-            blocks = (c_size + 1) * (1 << (c_size_mult + 2));
-            version = 1;
-            break;
-        }
-        case 1: {
-            blocksize = SD_SECTOR_SIZE;
-            const unsigned c_size = (buf[7] & 0x3f) << 16 | buf[8] << 8 | buf[9];
-            blocks = (c_size + 1) * 1024;
-            version = 2;
-            break;
-        }
-        case 2: {
-            printf("sd_init: Got CSD v3.0, but SDUC does not support SPI.\n");
+    if (!sd_cmd_read(9, 0, 16, buf)) {
+        printf("Failed to read CSD\n");
+        return false;
+    }
+    const uint8_t crc = sd_crc7(15, buf);
+    const uint8_t card_crc = buf[15] >> 1;
+    if (card_crc != crc) {
+        printf("CRC mismatch: Got %02hhx, expected %02hhx\n", card_crc, crc);
+        // Some cheap SD cards always report CRC=0, don't fail in that case
+        if (card_crc != 0) {
             return false;
         }
-        }
-        sd_context->blocks = blocks;
-        sd_context->blocksize = blocksize;
-#ifdef SD_DEBUG
-        printf("CSD version %u.0, blocksize %u, blocks %u, capacity %llu MiB\n", version, blocksize, blocks,
-               ((uint64_t)blocksize * blocks) / (1024 * 1024));
-#endif
     }
+    const unsigned csd_ver = buf[0] >> 6;
+    unsigned blocksize [[maybe_unused]] = 0;
+    unsigned blocks = 0;
+    unsigned version [[maybe_unused]] = 0;
+    unsigned max_speed [[maybe_unused]] = 0;
+    switch (csd_ver) {
+    case 0: {
+        if (sd_context->sdhc_sdxc) {
+            printf("sd_init: Got CSD v1.0 but card is SDHC/SDXC?\n");
+            return false;
+        }
+        const unsigned read_bl_len = buf[5] & 0xf;
+        if (read_bl_len < 9 || read_bl_len > 11) {
+            printf("Invalid read_bl_len in CSD 1.0\n");
+            return false;
+        }
+        blocksize = 1 << (buf[5] & 0xf);
+        const unsigned c_size_mult = (buf[9] & 0x1) << 2 | (buf[10] & 0xc0) >> 6;
+        const unsigned c_size = (buf[6] & 0x3) << 10 | (buf[7] << 2) | (buf[8] & 0xc0) >> 6;
+        blocks = (c_size + 1) * (1 << (c_size_mult + 2));
+        version = 1;
+        max_speed = buf[3];
+        break;
+    }
+    case 1: {
+        blocksize = SD_SECTOR_SIZE;
+        const unsigned c_size = (buf[7] & 0x3f) << 16 | buf[8] << 8 | buf[9];
+        blocks = (c_size + 1) * 1024;
+        version = 2;
+        max_speed = buf[3];
+        break;
+    }
+    case 2: {
+        printf("sd_init: Got CSD v3.0, but SDUC does not support SPI.\n");
+        return false;
+    }
+    }
+    sd_context->blocks = blocks;
+    sd_context->blocksize = blocksize;
+#ifdef SD_DEBUG
+    printf("CSD version %u.0, blocksize %u, blocks %u, capacity %llu MiB, max speed %u\n", version, blocksize, blocks,
+           ((uint64_t)blocksize * blocks) / (1024 * 1024), max_speed);
+#endif
     return true;
 }
 
@@ -191,52 +196,52 @@ bool sd_init(struct sd_context *sd_context, int mosi, int miso, int sck, int ss,
     }
 
     if (!sd_early_init()) {
-        return false;
+        goto out_spi;
     }
 
     if (!sd_check_interface_condition()) {
-        return false;
+        goto out_spi;
     }
 
     uint32_t ocr;
     if (!sd_read_ocr(&ocr)) {
         printf("sd_init: read OCR failed\n");
-        return false;
+        goto out_spi;
     }
     if ((ocr & 0x00380000) != 0x00380000) {
         printf("sd_init: unsupported card voltage range\n");
-        return false;
+        goto out_spi;
     }
 
     if (!sd_send_op_cond())
-        return false;
+        goto out_spi;
 
     sd_spi_set_bitrate(rate);
 
     if (!sd_read_ocr(&ocr)) {
         printf("sd_init: read OCR failed\n");
-        return false;
+        goto out_spi;
     }
     if (!(ocr & (1 << 31))) {
         printf("sd_init: card not powered up but !idle?\n");
-        return false;
+        goto out_spi;
     }
     sd_context->sdhc_sdxc = (ocr & (1 << 30));
 
     if (!sd_read_csd(sd_context)) {
-        return false;
+        goto out_spi;
     }
 
     if (sd_context->blocksize != SD_SECTOR_SIZE) {
         if (sd_context->blocksize != 1024 && sd_context->blocksize != 2048) {
             printf("sd_init: Unsupported block size %u\n", sd_context->blocksize);
-            return false;
+            goto out_spi;
         }
         // Attempt SET_BLOCKLEN command
         uint8_t resp[1];
         if (!sd_cmd(16, SD_SECTOR_SIZE, 1, resp)) {
             printf("sd_init: SET_BLOCKLEN failed\n");
-            return false;
+            goto out_spi;
         }
         // Successfully set blocksize to SD_SECTOR_SIZE, adjust context
         sd_context->blocks *= sd_context->blocksize / SD_SECTOR_SIZE;
@@ -253,6 +258,10 @@ bool sd_init(struct sd_context *sd_context, int mosi, int miso, int sck, int ss,
 
     sd_context->initialized = true;
     return true;
+
+out_spi:
+    sd_spi_deinit();
+    return false;
 }
 
 bool sd_deinit(struct sd_context *sd_context)

software/modules/rp2_sd/sd_spi.c

@@ -12,13 +12,15 @@
 #include <pico/time.h>
 #include <string.h>
 
+typedef enum { DMA_READ_TOKEN, DMA_READ, DMA_IDLE } sd_dma_state;
+
 struct sd_dma_context {
     uint8_t *read_buf;
     size_t len;
     uint8_t crc_buf[2];
     uint8_t read_token_buf;
     uint8_t wrdata;
-    _Atomic enum { DMA_READ_TOKEN, DMA_READ, DMA_IDLE } state;
+    _Atomic sd_dma_state state;
 };
 
 struct sd_spi_context {
@@ -111,8 +113,18 @@ static void __time_critical_func(sd_spi_dma_isr)(void)
 
 void sd_spi_wait_complete(void)
 {
-    while (sd_spi_context.sd_dma_context.state != DMA_IDLE)
+    while (true) {
+        const long flags = save_and_disable_interrupts();
+        const sd_dma_state state = sd_spi_context.sd_dma_context.state;
+        if (state == DMA_IDLE) {
+            restore_interrupts(flags);
+            return;
+        }
         __wfi();
+        restore_interrupts(flags);
+        __nop(); // Ensure at least two instructions between enable interrupts and subsequent disable
+        __nop();
+    }
 }
 
 bool sd_cmd_read_is_complete(void) { return sd_spi_context.sd_dma_context.state == DMA_IDLE; }
@@ -208,6 +220,12 @@ bool sd_cmd_read_complete(void)
     sd_spi_wait_complete();
     gpio_put(sd_spi_context.ss, true);
     sd_spi_read_blocking(0xff, &buf, 1);
+    if (sd_spi_context.sd_dma_context.read_token_buf != 0xfe) {
+#ifdef SD_DEBUG
+        printf("read failed: invalid read token %02hhx\n", sd_spi_context.sd_dma_context.read_token_buf);
+#endif
+        return false;
+    }
 #ifdef SD_READ_CRC_CHECK
     const uint16_t expect_crc = sd_crc16(sd_spi_context.sd_dma_context.len, sd_spi_context.sd_dma_context.read_buf);
     const uint16_t act_crc = sd_spi_context.sd_dma_context.crc_buf[0] << 8 | sd_spi_context.sd_dma_context.crc_buf[1];
@@ -218,7 +236,7 @@ bool sd_cmd_read_complete(void)
         return false;
     }
 #endif
-    return (sd_spi_context.sd_dma_context.read_token_buf == 0xfe);
+    return true;
 }
 
 bool sd_cmd_write(uint8_t cmd, uint32_t arg, unsigned datalen, uint8_t data[const static datalen])

software/modules/rp2_sd/sd_spi_pio.pio

@@ -52,10 +52,12 @@ static inline void sd_spi_pio_program_init(PIO pio, uint sm, uint offset, uint m
     sm_config_set_out_shift(&c, false, true, 8);
     sm_config_set_in_shift(&c, false, true, 8);
 
+    // high speed SPI needs to bypass the input synchronizers on the MISO pin
+    hw_set_bits(&pio->input_sync_bypass, 1u << miso);
+
     const unsigned pio_freq = bitrate*4;
     const float div = clock_get_hz(clk_sys) / (float)pio_freq;
-    // for some reason, small clkdiv values (even integer ones) cause issues
-    sm_config_set_clkdiv(&c, div < 2.5f ? 2.5f : div);
+    sm_config_set_clkdiv(&c, div);
     pio_sm_init(pio, sm, offset, &c);
 }
 %}

software/src/app.py

@@ -2,64 +2,94 @@
 # Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
 
 from collections import namedtuple
-import os
 import time
 from utils import TimerManager
 
 
-Dependencies = namedtuple('Dependencies', ('mp3player', 'nfcreader', 'buttons'))
+Dependencies = namedtuple('Dependencies', ('mp3player', 'nfcreader', 'buttons', 'playlistdb', 'hwconfig', 'leds',
+                                           'config'))
 
 # Should be ~ 6dB steps
 VOLUME_CURVE = [1, 2, 4, 8, 16, 32, 63, 126, 251]
 
 
 class PlayerApp:
+    class TagStateMachine:
+        def __init__(self, parent, timer_manager, timeout=5000):
+            self.parent = parent
+            self.timer_manager = timer_manager
+            self.current_tag = None
+            self.current_tag_time = time.ticks_ms()
+            self.timeout = timeout
+
+        def onTagChange(self, new_tag):
+            if new_tag is not None:
+                self.timer_manager.cancel(self.onTagRemoveDelay)
+            if new_tag == self.current_tag:
+                return
+            # Change playlist on new tag
+            if new_tag is not None:
+                self.current_tag_time = time.ticks_ms()
+                self.current_tag = new_tag
+                self.parent.onNewTag(new_tag)
+            else:
+                self.timer_manager.schedule(time.ticks_ms() + self.timeout, self.onTagRemoveDelay)
+
+        def onTagRemoveDelay(self):
+            if self.current_tag is not None:
+                self.current_tag = None
+                self.parent.onTagRemoved()
+
     def __init__(self, deps: Dependencies):
-        self.current_tag = None
-        self.current_tag_time = time.ticks_ms()
         self.timer_manager = TimerManager()
+        self.config = deps.config(self)
+        self.tag_timeout_ms = self.config.get_tag_timeout() * 1000
+        self.idle_timeout_ms = self.config.get_idle_timeout() * 1000
+        self.tag_state_machine = self.TagStateMachine(self, self.timer_manager, self.tag_timeout_ms)
         self.player = deps.mp3player(self)
-        self.nfc = deps.nfcreader(self)
+        self.nfc = deps.nfcreader(self.tag_state_machine)
+        self.playlist_db = deps.playlistdb(self)
+        self.hwconfig = deps.hwconfig(self)
+        self.leds = deps.leds(self)
+        self.tag_mode = self.playlist_db.getSetting('tagmode')
+        self.playing_tag = None
+        self.playlist = None
         self.buttons = deps.buttons(self) if deps.buttons is not None else None
         self.mp3file = None
         self.volume_pos = 3
+        self.paused = False
+        self.playing = False
         self.player.set_volume(VOLUME_CURVE[self.volume_pos])
+        self._onIdle()
 
     def __del__(self):
         if self.mp3file is not None:
             self.mp3file.close()
             self.mp3file = None
 
-    def onTagChange(self, new_tag):
-        if new_tag is not None:
-            self.timer_manager.cancel(self.onTagRemoveDelay)
-        if new_tag == self.current_tag:
-            return
-        # Change playlist on new tag
-        if new_tag is not None:
-            self.current_tag_time = time.ticks_ms()
-            self.current_tag = new_tag
-            uid_str = ''.join('{:02x}'.format(x) for x in new_tag)
-            try:
-                testfiles = [f'/sd/{uid_str}/'.encode() + name for name in os.listdir(f'/sd/{uid_str}'.encode())
-                             if name.endswith(b'mp3')]
-            except OSError as ex:
-                print(f'Could not get playlist for tag {uid_str}: {ex}')
-                self.current_tag = None
-                self.player.stop()
-                return
-            testfiles.sort()
-            self._set_playlist(testfiles)
-        else:
-            self.timer_manager.schedule(time.ticks_ms() + 5000, self.onTagRemoveDelay)
+    def onNewTag(self, new_tag):
+        """
+        Callback (typically called by TagStateMachine) to signal that a new tag has been presented.
+        """
+        uid_str = b''.join('{:02x}'.format(x).encode() for x in new_tag)
+        if self.tag_mode == 'tagremains' or (self.tag_mode == 'tagstartstop' and new_tag != self.playing_tag):
+            self._set_playlist(uid_str)
+            self.playing_tag = new_tag
+        elif self.tag_mode == 'tagstartstop':
+            print('Tag presented again, stopping playback')
+            self._unset_playlist()
+            self.playing_tag = None
 
-    def onTagRemoveDelay(self):
-        if self.current_tag is not None:
+    def onTagRemoved(self):
+        """
+        Callback (typically called by TagStateMachine) to signal that a tag has been removed.
+        """
+        if self.tag_mode == 'tagremains':
             print('Tag gone, stopping playback')
-            self.current_tag = None
-            self.player.stop()
+            self._unset_playlist()
 
     def onButtonPressed(self, what):
+        assert self.buttons is not None
         if what == self.buttons.VOLUP:
             self.volume_pos = min(self.volume_pos + 1, len(VOLUME_CURVE) - 1)
             self.player.set_volume(VOLUME_CURVE[self.volume_pos])
@@ -68,26 +98,98 @@ class PlayerApp:
             self.player.set_volume(VOLUME_CURVE[self.volume_pos])
         elif what == self.buttons.NEXT:
             self._play_next()
+        elif what == self.buttons.PREV:
+            self._play_prev()
+        elif what == self.buttons.PLAY_PAUSE:
+            self._pause_toggle()
 
     def onPlaybackDone(self):
+        assert self.mp3file is not None
         self.mp3file.close()
         self.mp3file = None
         self._play_next()
 
-    def _set_playlist(self, files: list[bytes]):
-        self.playlist_pos = 0
-        self.playlist = files
-        self._play(self.playlist[self.playlist_pos])
+    def onIdleTimeout(self):
+        if self.hwconfig.get_on_battery():
+            self.hwconfig.power_off()
+        else:
+            # Check again in a minute
+            self.timer_manager.schedule(time.ticks_ms() + self.idle_timeout_ms, self.onIdleTimeout)
+
+    def reset_idle_timeout(self):
+        if not self.playing:
+            self.timer_manager.schedule(time.ticks_ms() + self.idle_timeout_ms, self.onIdleTimeout)
+
+    def is_playing(self) -> bool:
+        return self.playing
+
+    def _set_playlist(self, tag: bytes):
+        if self.playlist is not None:
+            pos = self.player.stop()
+            if pos is not None:
+                self.playlist.setPlaybackOffset(pos)
+        self.playlist = self.playlist_db.getPlaylistForTag(tag)
+        self._play(self.playlist.getCurrentPath() if self.playlist is not None else None,
+                   self.playlist.getPlaybackOffset() if self.playlist is not None else 0)
+
+    def _unset_playlist(self):
+        if self.playlist is not None:
+            pos = self.player.stop()
+            self._onIdle()
+            if pos is not None:
+                self.playlist.setPlaybackOffset(pos)
+            self.playlist = None
 
     def _play_next(self):
-        if self.playlist_pos + 1 < len(self.playlist):
-            self.playlist_pos += 1
-            self._play(self.playlist[self.playlist_pos])
+        if self.playlist is None:
+            return
+        filename = self.playlist.getNextPath()
+        self._play(filename)
+        if filename is None:
+            self.playlist = None
+            self.playing_tag = None
 
-    def _play(self, filename: bytes):
+    def _play_prev(self):
+        if self.playlist is None:
+            return
+        filename = self.playlist.getPrevPath()
+        self._play(filename)
+        if filename is None:
+            self.playlist = None
+            self.playing_tag = None
+
+    def _play(self, filename: bytes | None, offset=0):
         if self.mp3file is not None:
             self.player.stop()
             self.mp3file.close()
             self.mp3file = None
-        self.mp3file = open(filename, 'rb')
-        self.player.play(self.mp3file)
+            self._onIdle()
+        if filename is not None:
+            print(f'Playing {filename!r}')
+            self.mp3file = open(filename, 'rb')
+            self.player.play(self.mp3file, offset)
+            self.paused = False
+            self._onActive()
+
+    def _pause_toggle(self):
+        if self.playlist is None:
+            return
+        if self.paused:
+            self._play(self.playlist.getCurrentPath(), self.pause_offset)
+        else:
+            self.pause_offset = self.player.stop()
+            self.paused = True
+            self._onIdle()
+
+    def _onIdle(self):
+        self.timer_manager.schedule(time.ticks_ms() + self.idle_timeout_ms, self.onIdleTimeout)
+        self.leds.set_state(self.leds.IDLE)
+        self.playing = False
+
+    def _onActive(self):
+        self.timer_manager.cancel(self.onIdleTimeout)
+        self.leds.set_state(self.leds.PLAYING)
+        self.playing = True
+
+    def get_nfc(self):
+        return self.nfc

software/src/hwconfig_Rev1/hwconfig.py

@@ -28,24 +28,24 @@ RC522_SS = Pin.board.GP13
 
 # WS2812
 LED_DIN = Pin.board.GP16
-LED_COUNT = 1
 
 # Buttons
-BUTTON_VOLUP = Pin.board.GP17
-BUTTON_VOLDOWN = Pin.board.GP19
-BUTTON_NEXT = Pin.board.GP18
-BUTTON_POWER = Pin.board.GP21
+BUTTONS = [Pin.board.GP17,
+           Pin.board.GP18,
+           Pin.board.GP19,
+           Pin.board.GP20,
+           Pin.board.GP21,
+           ]
 
 # Power
 POWER_EN = Pin.board.GP22
 VBAT_ADC = Pin.board.GP26
+VBUS_DET = Pin.board.WL_GPIO2
 
 
 def board_init():
-    # Keep power turned on
+    # POWER_EN turned on in MICROPY_BOARD_STARTUP
     # TODO: Implement soft power off
-    POWER_EN.init(mode=Pin.OUT)
-    POWER_EN.value(1)
 
     # SD_DO / MISO input doesn't need any special configuration
     # Set 8 mA drive strength for SCK and MOSI
@@ -63,3 +63,13 @@ def get_battery_voltage():
     adc = machine.ADC(VBAT_ADC)     # create ADC object on ADC pin
     battv = adc.read_u16()/65535.0*3.3*2
     return battv
+
+
+def power_off():
+    POWER_EN.init(mode=Pin.OUT)
+    POWER_EN.value(0)
+
+
+def get_on_battery():
+    vbus = VBUS_DET.value()
+    return not vbus

software/src/hwconfig_breadboard/hwconfig.py

@@ -27,13 +27,12 @@ RC522_SS = Pin.board.GP13
 
 # WS2812
 LED_DIN = Pin.board.GP16
-LED_COUNT = 1
 
 # Buttons
-BUTTON_VOLUP = Pin.board.GP17
-BUTTON_VOLDOWN = Pin.board.GP19
-BUTTON_NEXT = Pin.board.GP18
-BUTTON_POWER = None
+BUTTONS = [Pin.board.GP17,
+           Pin.board.GP18,
+           Pin.board.GP19,
+           ]
 
 # Power
 POWER_EN = None
@@ -47,3 +46,12 @@ def board_init():
 def get_battery_voltage():
     # Not supported on breadboard
     return None
+
+
+def power_off():
+    # Not supported on breadboard
+    pass
+
+
+def get_on_battery():
+    return False

software/src/led_test.py

@@ -1,58 +0,0 @@
-# SPDX-License-Identifier: MIT
-# Copyright (c) 2024 Matthias Blankertz <matthias@blankertz.org>
-
-# Run with mpremote.py run src/led_test.py
-
-from machine import Pin
-from math import pi, sin, pow
-from micropython import const
-from rp2_neopixel import NeoPixel
-from time import sleep, ticks_ms
-import asyncio
-
-pin = Pin.board.GP16
-leds = const(10)
-brightness = 0.5
-
-np = NeoPixel(pin, leds)
-
-# test fill and write
-
-print("LEDs should now turn red")
-np.fill((255, 0, 0))
-np.write()
-sleep(1)
-
-print("LEDs should now turn green")
-np.fill((0, 255, 0))
-np.write()
-sleep(1)
-
-print("LEDs should now turn blue")
-np.fill((0, 0, 255))
-np.write()
-sleep(1)
-
-
-# test async
-def gamma(value, X=2.2):
-    return min(max(int(brightness * pow(value / 255.0, X) * 255.0 + 0.5), 0), 255)
-
-
-async def rainbow(np, period=10):
-    count = 0.0
-    while True:
-        for i in range(leds):
-            ofs = (count + i) % leds
-            np[i] = (gamma((sin(ofs / leds * 2 * pi) + 1) * 127),
-                     gamma((sin(ofs / leds * 2 * pi + 2/3*pi) + 1) * 127),
-                     gamma((sin(ofs / leds * 2 * pi + 4/3*pi) + 1) * 127))
-        count += 0.2
-        before = ticks_ms()
-        await np.async_write()
-        now = ticks_ms()
-        if before + 20 > now:
-            await asyncio.sleep_ms(20 - (now - before))
-
-print("LEDs should now start rainbowing")
-asyncio.run(rainbow(np))

software/src/main.py

@@ -3,10 +3,13 @@
 
 import aiorepl  # type: ignore
 import asyncio
+from errno import ENOENT
 import machine
 import micropython
+import network
+import os
 import time
-from math import pi, sin, pow
+import ubinascii
 
 # Own modules
 import app
@@ -15,7 +18,8 @@ from mfrc522 import MFRC522
 from mp3player import MP3Player
 from nfc import Nfc
 from rp2_neopixel import NeoPixel
-from utils import Buttons, SDContext, TimerManager
+from utils import BTreeFileManager, Buttons, SDContext, TimerManager, LedManager, Configuration
+from webserver import start_webserver
 
 try:
     import hwconfig
@@ -28,62 +32,104 @@ micropython.alloc_emergency_exception_buf(100)
 # Machine setup
 hwconfig.board_init()
 
-
-async def rainbow(np, period=10):
-    def gamma(value, X=2.2):
-        return min(max(int(brightness * pow(value / 255.0, X) * 255.0 + 0.5), 0), 255)
-
-    brightness = 0.05
-    count = 0.0
-    leds = len(np)
-    while True:
-        for i in range(leds):
-            ofs = (count + i) % leds
-            np[i] = (gamma((sin(ofs / leds * 2 * pi) + 1) * 127),
-                     gamma((sin(ofs / leds * 2 * pi + 2/3*pi) + 1) * 127),
-                     gamma((sin(ofs / leds * 2 * pi + 4/3*pi) + 1) * 127))
-        count += 0.02 * leds
-        before = time.ticks_ms()
-        await np.async_write()
-        now = time.ticks_ms()
-        if before + 20 > now:
-            await asyncio.sleep_ms(20 - (now - before))
-
-
 # high prio for proc 1
 machine.mem32[0x40030000 + 0x00] = 0x10
 
 
+def setup_wifi():
+    network.hostname("TonberryPico")
+    wlan = network.WLAN(network.WLAN.IF_AP)
+    wlan.config(ssid=f"TonberryPicoAP_{machine.unique_id().hex()}", security=wlan.SEC_OPEN)
+    wlan.active(True)
+
+    # disable power management
+    wlan.config(pm=network.WLAN.PM_NONE)
+
+    mac = ubinascii.hexlify(network.WLAN().config('mac'), ':').decode()
+    print(f"     mac: {mac}")
+    print(f" channel: {wlan.config('channel')}")
+    print(f"   essid: {wlan.config('essid')}")
+    print(f" txpower: {wlan.config('txpower')}")
+    print(f"ifconfig: {wlan.ifconfig()}")
+
+
+async def wdt_task(wdt):
+    # TODO: more checking of app health
+    # Right now this only protects against the asyncio executor crashing completely
+    while True:
+        await asyncio.sleep_ms(500)
+        wdt.feed()
+
+DB_PATH = '/sd/tonberry.db'
+
+config = Configuration()
+
+
 def run():
     asyncio.new_event_loop()
     # Setup LEDs
-    np = NeoPixel(hwconfig.LED_DIN, hwconfig.LED_COUNT, sm=1)
-    asyncio.create_task(rainbow(np))
+    np = NeoPixel(hwconfig.LED_DIN, config.get_led_count(), sm=1)
+
+    # Wifi with default config
+    setup_wifi()
 
     # Setup MP3 player
     with SDContext(mosi=hwconfig.SD_DI, miso=hwconfig.SD_DO, sck=hwconfig.SD_SCK, ss=hwconfig.SD_CS,
-                   baudrate=hwconfig.SD_CLOCKRATE), \
-         AudioContext(hwconfig.I2S_DIN, hwconfig.I2S_DCLK, hwconfig.I2S_LRCLK) as audioctx:
+                   baudrate=hwconfig.SD_CLOCKRATE):
+        # Temporary hack: build database from folders if no database exists
+        # Can be removed once playlists can be created via API
+        try:
+            _ = os.stat(DB_PATH)
+        except OSError as ex:
+            if ex.errno == ENOENT:
+                print("No playlist DB found, trying to build DB from tag dirs")
+                builddb()
 
-        # Setup NFC
-        reader = MFRC522(spi_id=hwconfig.RC522_SPIID, sck=hwconfig.RC522_SCK, miso=hwconfig.RC522_MISO,
-                         mosi=hwconfig.RC522_MOSI, cs=hwconfig.RC522_SS, rst=hwconfig.RC522_RST, tocard_retries=20)
+        with BTreeFileManager(DB_PATH) as playlistdb, \
+             AudioContext(hwconfig.I2S_DIN, hwconfig.I2S_DCLK, hwconfig.I2S_LRCLK) as audioctx:
 
-        # Setup app
-        deps = app.Dependencies(mp3player=lambda the_app: MP3Player(audioctx, the_app),
-                                nfcreader=lambda the_app: Nfc(reader, the_app),
-                                buttons=lambda the_app: Buttons(the_app, pin_volup=hwconfig.BUTTON_VOLUP,
-                                                                pin_voldown=hwconfig.BUTTON_VOLDOWN,
-                                                                pin_next=hwconfig.BUTTON_NEXT))
-        the_app = app.PlayerApp(deps)
+            # Setup NFC
+            reader = MFRC522(spi_id=hwconfig.RC522_SPIID, sck=hwconfig.RC522_SCK, miso=hwconfig.RC522_MISO,
+                             mosi=hwconfig.RC522_MOSI, cs=hwconfig.RC522_SS, rst=hwconfig.RC522_RST, tocard_retries=20)
 
-        # Start
-        asyncio.create_task(aiorepl.task({'timer_manager': TimerManager(),
-                                          'app': the_app}))
-        asyncio.get_event_loop().run_forever()
+            # Setup app
+            deps = app.Dependencies(mp3player=lambda the_app: MP3Player(audioctx, the_app),
+                                    nfcreader=lambda the_app: Nfc(reader, the_app),
+                                    buttons=lambda the_app: Buttons(the_app, config, hwconfig),
+                                    playlistdb=lambda _: playlistdb,
+                                    hwconfig=lambda _: hwconfig,
+                                    leds=lambda _: LedManager(np),
+                                    config=lambda _: config)
+            the_app = app.PlayerApp(deps)
+
+            start_webserver(config, the_app)
+            # Start
+            wdt = machine.WDT(timeout=1000)
+            asyncio.create_task(aiorepl.task({'timer_manager': TimerManager(),
+                                              'app': the_app}))
+            asyncio.create_task(wdt_task(wdt))
+            asyncio.get_event_loop().run_forever()
+
+
+def builddb():
+    """
+    For testing, build a playlist db based on the previous tag directory format.
+    Can be removed once uploading files / playlist via the web api is possible.
+    """
+    try:
+        os.unlink(DB_PATH)
+    except OSError:
+        pass
+    with BTreeFileManager(DB_PATH) as db:
+        for name, type_, _, _ in os.ilistdir(b'/sd'):
+            if type_ != 0x4000:
+                continue
+            fl = [b'/sd/' + name + b'/' + x for x in os.listdir(b'/sd/' + name) if x.endswith(b'.mp3')]
+            db.createPlaylistForTag(name, fl)
+    os.sync()
 
 
 if __name__ == '__main__':
-    if machine.Pin(17, machine.Pin.IN, machine.Pin.PULL_UP).value() != 0:
-        time.sleep(1)
+    time.sleep(1)
+    if machine.Pin(hwconfig.BUTTONS[0], machine.Pin.IN, machine.Pin.PULL_UP).value() != 0:
         run()

software/src/mfrc522_test.py

@@ -1,73 +0,0 @@
-from mfrc522 import MFRC522
-import asyncio
-import time
-
-delay_sum = 0
-delay_count = 0
-max_delay = 0
-
-
-async def latency_test():
-    global delay_sum
-    global delay_count
-    global max_delay
-    global min_delay
-    min_delay = 0xffffffff
-    await asyncio.sleep_ms(1)
-    while True:
-        for _ in range(2000):
-            before = time.ticks_us()
-            await asyncio.sleep(0)
-            after = time.ticks_us()
-            delay = after - before
-            delay_sum += delay
-            delay_count += 1
-            if delay > max_delay:
-                max_delay = delay
-            if delay < min_delay:
-                min_delay = delay
-            await asyncio.sleep_ms(1)
-        print(f"delay (min / max / avg) [µs]: ({min_delay} / {max_delay} / {delay/delay_sum})")
-
-
-def uid_to_string(uid: list):
-    return '0x' + ''.join(f'{i:02x}' for i in uid)
-
-
-async def get_tag_uid(reader: MFRC522, poll_interval_ms: int = 50) -> list:
-    '''
-    The maximum measured delay with poll_interval_ms=50 and a reader with tocard_retries=5 is
-    15.9 ms:
-        delay (min / max / avg) [µs]: (360 / 15945 / 1.892923e-06)
-
-    The maximum measured delay dropped to 11.6 ms by setting tocard_retries=1:
-        delay (min / max / avg) [µs]: (368 / 11696 / 6.204211e-06)
-    '''
-    while True:
-        reader.init()
-
-        # For now we omit the tag type
-        (stat, _) = reader.request(reader.REQIDL)
-        if stat == reader.OK:
-            (stat, uid) = reader.SelectTagSN()
-            if stat == reader.OK:
-                print(f"uid={uid_to_string(uid)}")
-
-        await asyncio.sleep_ms(poll_interval_ms)
-
-
-def main():
-    reader = MFRC522(spi_id=1, sck=10, miso=12, mosi=11, cs=13, rst=9, tocard_retries=1)
-
-    print("")
-    print("Please place card on reader")
-    print("")
-
-    asyncio.create_task(get_tag_uid(reader))
-    asyncio.create_task(latency_test())
-
-    asyncio.get_event_loop().run_forever()
-
-
-if __name__ == "__main__":
-    main()

software/src/microdot_test.py

@@ -1,38 +0,0 @@
-import rp2
-import network
-import ubinascii
-from microdot import Microdot
-
-rp2.country('DE')
-
-wlan = network.WLAN(network.AP_IF)
-wlan.config(ssid='TonberryPico', security=network.WLAN.SEC_OPEN)
-# Important: we cannot change the ip in station mode, otherwise dhcp won't work!
-# wlan.ipconfig(addr4='10.0.0.1')
-wlan.active(True)   # loads the firmware
-while wlan.active() is False:
-    pass
-wlan.config(pm=network.WLAN.PM_NONE)
-
-mac = ubinascii.hexlify(network.WLAN().config('mac'), ':').decode()
-print(f"     mac: {mac}")
-print(f" channel: {wlan.config('channel')}")
-print(f"   essid: {wlan.config('essid')}")
-print(f" txpower: {wlan.config('txpower')}")
-print(f"ifconfig: {wlan.ifconfig()}")
-
-app = Microdot()
-
-
-@app.route('/')
-async def index(request):
-    print("wohoo, a guest :)")
-    print(f"  app: {request.app}")
-    print(f"  client: {request.client_addr}")
-    print(f"  method: {request.method}")
-    print(f"  url: {request.url}")
-    print(f"  headers: {request.headers}")
-    print(f"  cookies: {request.cookies}")
-    return "TonberryPico says 'Hello World!'"
-
-app.run(port=80)

software/src/mp3player.py

@@ -21,14 +21,19 @@ class MP3Player:
         self.mp3task = None
         self.volume = 128
         self.cb = cb
+        self.pos = 0
 
-    def play(self, stream):
+    def play(self, stream, offset=0):
         """
         Play from byte stream.
+        If offset > 0, discard the first offset bytes
         """
         if self.mp3task is not None:
             self.mp3task.cancel()
             self.mp3task = None
+        if offset > 0:
+            stream.seek(offset, 1)
+        self.pos = offset
         self.mp3task = asyncio.create_task(self._play_task(stream))
 
     def stop(self):
@@ -38,6 +43,8 @@ class MP3Player:
         if self.mp3task is not None:
             self.mp3task.cancel()
             self.mp3task = None
+            return self.pos
+        return None
 
     def set_volume(self, volume: int):
         """
@@ -60,6 +67,7 @@ class MP3Player:
                     # End of file
                     break
                 _, _, underruns = await self.audiocore.async_put(data[:bytes_read])
+                self.pos += bytes_read
                 if underruns > known_underruns:
                     print(f"{underruns:x}")
                     known_underruns = underruns

software/src/nfc/nfc.py

@@ -6,6 +6,7 @@ Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
 
 import asyncio
 import time
+from utils import safe_callback
 
 from mfrc522 import MFRC522
 try:
@@ -74,7 +75,7 @@ class Nfc:
                 self.last_uid = uid
                 self.last_uid_timestamp = time.ticks_us()
             if self.cb is not None and last_callback_uid != uid:
-                self.cb.onTagChange(uid)
+                safe_callback(lambda: self.cb.onTagChange(uid), "nfc tag change")
                 last_callback_uid = uid
 
             await asyncio.sleep_ms(poll_interval_ms)

software/src/test.py

@@ -1,113 +0,0 @@
-# SPDX-License-Identifier: MIT
-# Copyright (c) 2024-2025 Matthias Blankertz <matthias@blankertz.org>
-
-import aiorepl
-import asyncio
-import machine
-import micropython
-import os
-import time
-from machine import Pin
-from math import pi, sin, pow
-from micropython import const
-
-# Own modules
-from audiocore import Audiocore
-from mp3player import MP3Player
-from rp2_neopixel import NeoPixel
-from rp2_sd import SDCard
-
-micropython.alloc_emergency_exception_buf(100)
-
-leds = const(10)
-brightness = 0.5
-
-
-def gamma(value, X=2.2):
-    return min(max(int(brightness * pow(value / 255.0, X) * 255.0 + 0.5), 0), 255)
-
-
-async def rainbow(np, period=10):
-    count = 0.0
-    while True:
-        for i in range(leds):
-            ofs = (count + i) % leds
-            np[i] = (gamma((sin(ofs / leds * 2 * pi) + 1) * 127),
-                     gamma((sin(ofs / leds * 2 * pi + 2/3*pi) + 1) * 127),
-                     gamma((sin(ofs / leds * 2 * pi + 4/3*pi) + 1) * 127))
-        count += 0.2
-        before = time.ticks_ms()
-        await np.async_write()
-        now = time.ticks_ms()
-        if before + 20 > now:
-            await asyncio.sleep_ms(20 - (now - before))
-
-
-# Set 8 mA drive strength and fast slew rate
-machine.mem32[0x4001c004 + 6*4] = 0x67
-machine.mem32[0x4001c004 + 7*4] = 0x67
-machine.mem32[0x4001c004 + 8*4] = 0x67
-
-
-def list_sd():
-    try:
-        sd = SDCard(mosi=Pin(3), miso=Pin(4), sck=Pin(2), ss=Pin(5), baudrate=15000000)
-    except OSError:
-        for i in range(leds):
-            np[i] = (255, 0, 0)
-        np.write()
-        return
-    try:
-        os.mount(sd, '/sd')
-        print(os.listdir(b'/sd'))
-    except OSError as ex:
-        print(f"{ex}")
-
-
-delay_sum = 0
-delay_count = 0
-max_delay = 0
-
-
-async def latency_test():
-    global delay_sum
-    global delay_count
-    global max_delay
-    await asyncio.sleep_ms(1)
-    while True:
-        for _ in range(2000):
-            before = time.ticks_us()
-            await asyncio.sleep(0)
-            after = time.ticks_us()
-            delay = after - before
-            delay_sum += delay
-            delay_count += 1
-            if delay > max_delay:
-                max_delay = delay
-            await asyncio.sleep_ms(1)
-        print(f"Max delay {max_delay} us, average {delay/delay_sum} us")
-
-pin = Pin.board.GP16
-np = NeoPixel(pin, leds)
-
-# Test SD card
-list_sd()
-
-# Test NeoPixel
-asyncio.create_task(rainbow(np))
-
-# Test audio
-audioctx = Audiocore(Pin(8), Pin(6))
-
-player = MP3Player(audioctx)
-
-# high prio for proc 1
-machine.mem32[0x40030000 + 0x00] = 0x10
-
-testfiles = [b'/sd/' + name for name in os.listdir(b'/sd') if name.endswith(b'mp3')]
-player.set_playlist(testfiles)
-asyncio.create_task(player.task())
-
-
-asyncio.create_task(aiorepl.task({'player': player}))
-asyncio.get_event_loop().run_forever()

software/src/tonberry.schema.json

@@ -0,0 +1,53 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "definitions": {
+        "PlaybackPosition": {
+            "type": "object",
+            "properties": {
+                "position_seconds": { "type": "number" },
+                "device_uptime": { "type": "number" }
+            },
+            "required": ["position_seconds"]
+        },
+        "AudioFile": {
+            "type": "object",
+            "properties": {
+                "id": { "type": "string", "format": "uuid" },
+                "filename": { "type": "string" },
+                "size_bytes": { "type": "integer" },
+                "duration_seconds": { "type": "number" },
+                "last_played_uptime": { "type": "number" },
+                "playback_position": { "$ref": "#/definitions/PlaybackPosition" }
+            },
+            "required": ["id", "filename"]
+        },
+        "Playlist": {
+            "type": "object",
+            "properties": {
+                "id": { "type": "string", "format": "uuid" },
+                "name": { "type": "string" },
+                "audio_files": {
+                    "type": "array",
+                    "items": { "$ref": "#/definitions/AudioFile" }
+                },
+                "current_track_index": { "type": "integer", "minimum": 0 },
+                "last_played_uptime": { "type": "number" },
+                "playback_position": { "$ref": "#/definitions/PlaybackPosition" }
+            },
+            "required": ["id", "name", "audio_files"]
+        },
+        "NfcTag": {
+            "type": "object",
+            "properties": {
+                "uid": { "type": "string" },
+                "name": { "type": "string" },
+                "linked_type": {
+                    "type": "string",
+                    "enum": ["audio_file", "playlist"]
+                },
+                "linked_id": { "type": "string", "format": "uuid" }
+            },
+            "required": ["uid", "linked_type", "linked_id"]
+        }
+    }
+}

software/src/utils/__init__.py

@@ -1,10 +1,15 @@
 # SPDX-License-Identifier: MIT
 # Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
 
+from utils.helpers import safe_callback
 from utils.buttons import Buttons
+from utils.config import Configuration
+from utils.leds import LedManager
 from utils.mbrpartition import MBRPartition
 from utils.pinindex import get_pin_index
+from utils.playlistdb import BTreeDB, BTreeFileManager
 from utils.sdcontext import SDContext
 from utils.timer import TimerManager
 
-__all__ = ["Buttons", "get_pin_index", "MBRPartition", "SDContext", "TimerManager"]
+__all__ = ["BTreeDB", "BTreeFileManager", "Buttons", "Configuration", "get_pin_index", "LedManager", "MBRPartition",
+           "safe_callback", "SDContext", "TimerManager"]

software/src/utils/buttons.py

@@ -5,6 +5,7 @@ import asyncio
 import machine
 import micropython
 import time
+from utils import safe_callback
 try:
     from typing import TYPE_CHECKING  # type: ignore
 except ImportError:
@@ -17,14 +18,27 @@ if TYPE_CHECKING:
 
 
 class Buttons:
-    def __init__(self, cb: "ButtonCallback", pin_volup=17, pin_voldown=19, pin_next=18):
-        self.VOLUP = micropython.const(1)
-        self.VOLDOWN = micropython.const(2)
-        self.NEXT = micropython.const(3)
+    VOLUP = micropython.const(1)
+    VOLDOWN = micropython.const(2)
+    NEXT = micropython.const(3)
+    PREV = micropython.const(4)
+    PLAY_PAUSE = micropython.const(5)
+    KEYMAP = {VOLUP: 'VOLUP',
+              VOLDOWN: 'VOLDOWN',
+              NEXT: 'NEXT',
+              PREV: 'PREV',
+              PLAY_PAUSE: 'PLAY_PAUSE'}
+
+    def __init__(self, cb: "ButtonCallback", config, hwconfig):
+        self.button_map = config.get_button_map()
+        self.hw_buttons = hwconfig.BUTTONS
         self.cb = cb
-        self.buttons = {machine.Pin(pin_volup, machine.Pin.IN, machine.Pin.PULL_UP): self.VOLUP,
-                        machine.Pin(pin_voldown, machine.Pin.IN, machine.Pin.PULL_UP): self.VOLDOWN,
-                        machine.Pin(pin_next, machine.Pin.IN, machine.Pin.PULL_UP): self.NEXT}
+        self.buttons = dict()
+        for key_id, key_name in self.KEYMAP.items():
+            pin = self._get_pin(key_name)
+            if pin is None:
+                continue
+            self.buttons[pin] = key_id
         self.int_flag = asyncio.ThreadSafeFlag()
         self.pressed: list[int] = []
         self.last: dict[int, int] = {}
@@ -32,6 +46,17 @@ class Buttons:
             button.irq(handler=self._interrupt, trigger=machine.Pin.IRQ_FALLING | machine.Pin.IRQ_RISING)
         asyncio.create_task(self.task())
 
+    def _get_pin(self, key):
+        key_id = self.button_map.get(key, None)
+        if key_id is None:
+            return None
+        if key_id < 0 or key_id >= len(self.hw_buttons):
+            return None
+        pin = self.hw_buttons[key_id]
+        if pin is not None:
+            pin.init(machine.Pin.IN, machine.Pin.PULL_UP)
+        return pin
+
     def _interrupt(self, button):
         keycode = self.buttons[button]
         last = self.last.get(keycode, 0)
@@ -50,4 +75,4 @@ class Buttons:
             await self.int_flag.wait()
             while len(self.pressed) > 0:
                 what = self.pressed.pop()
-                self.cb.onButtonPressed(what)
+                safe_callback(lambda: self.cb.onButtonPressed(what), "button callback")

software/src/utils/config.py

@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
+
+from errno import ENOENT
+import json
+import os
+try:
+    from typing import TYPE_CHECKING, Mapping, Any
+except ImportError:
+    TYPE_CHECKING = False
+
+
+class Configuration:
+    DEFAULT_CONFIG = {
+        'LED_COUNT': 1,
+        'IDLE_TIMEOUT_SECS': 60,
+        'TAG_TIMEOUT_SECS': 5,
+        'BUTTON_MAP': {
+            'PLAY_PAUSE': 4,
+            'VOLUP': 0,
+            'VOLDOWN': 2,
+            'PREV': None,
+            'NEXT': 1,
+        }
+    }
+
+    def __init__(self, config_path='/config.json'):
+        self.config_path = config_path
+        try:
+            with open(self.config_path, 'r') as conf_file:
+                self.config = json.load(conf_file)
+        except OSError as ex:
+            if ex.errno == ENOENT:
+                self.config = Configuration.DEFAULT_CONFIG
+                self._save()
+            else:
+                raise
+        except ValueError as ex:
+            print(f"Warning: Could not load configuration {self.config_path}:\n{ex}")
+            self._move_config_to_backup()
+            self.config = Configuration.DEFAULT_CONFIG
+
+    def _move_config_to_backup(self):
+        # Remove old backup
+        try:
+            os.remove(self.config_path + '.bup')
+            os.rename(self.config_path, self.config_path + '.bup')
+        except OSError as ex:
+            if ex.errno != ENOENT:
+                raise
+        os.sync()
+
+    def _save(self):
+        with open(self.config_path + '.new', 'w') as conf_file:
+            json.dump(self.config, conf_file)
+        self._move_config_to_backup()
+        os.rename(self.config_path + '.new', self.config_path)
+        os.sync()
+
+    def _get(self, key):
+        return self.config.get(key, self.DEFAULT_CONFIG[key])
+
+    def get_led_count(self) -> int:
+        return self._get('LED_COUNT')
+
+    def get_idle_timeout(self) -> int:
+        return self._get('IDLE_TIMEOUT_SECS')
+
+    def get_tag_timeout(self) -> int:
+        return self._get('TAG_TIMEOUT_SECS')
+
+    def get_button_map(self) -> Mapping[str, int | None]:
+        return self._get('BUTTON_MAP')
+
+    # For the web API
+    def get_config(self) -> Mapping[str, Any]:
+        return self.config
+
+    def _validate(self, default, config, path=''):
+        for k in config.keys():
+            if k not in default:
+                raise ValueError(f'Invalid config key {path}/{k}')
+            if isinstance(default[k], dict):
+                if not isinstance(config[k], dict):
+                    raise ValueError(f'Invalid config: Value of {path}/{k} must be mapping')
+                self._validate(default[k], config[k], f'{path}/{k}')
+
+    def set_config(self, config):
+        self._validate(self.DEFAULT_CONFIG, config)
+        self.config = config
+        self._save()

software/src/utils/helpers.py

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
+
+import sys
+
+
+def safe_callback(func, name="callback"):
+    try:
+        func()
+    except Exception as ex:
+        print(f"Uncaught exception in {name}")
+        sys.print_exception(ex)

software/src/utils/leds.py

@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
+
+import asyncio
+from math import sin, pi
+from micropython import const
+import time
+
+
+class LedManager:
+    IDLE = const(0)
+    PLAYING = const(1)
+
+    def __init__(self, np):
+        self.led_state = LedManager.IDLE
+        self.np = np
+        self.brightness = 0.1
+        self.leds = len(self.np)
+        asyncio.create_task(self.run())
+
+    def set_state(self, state):
+        assert state in [LedManager.IDLE, LedManager.PLAYING]
+        self.led_state = state
+
+    def _gamma(self, value, X=2.2):
+        result = min(max(int(self.brightness * pow(value / 255.0, X) * 255.0 + 0.5), 0), 255)
+        if value > 0:
+            result = max(1, result)
+        return result
+
+    def _rainbow(self, time):
+        for i in range(self.leds):
+            ofs = (time * self.leds + i) % self.leds
+            self.np[i] = (self._gamma((sin(ofs / self.leds * 2 * pi) + 1) * 127),
+                          self._gamma((sin(ofs / self.leds * 2 * pi + 2/3*pi) + 1) * 127),
+                          self._gamma((sin(ofs / self.leds * 2 * pi + 4/3*pi) + 1) * 127))
+
+    def _pulse(self, time, color, speed):
+        scaled_sin = max(1, abs(sin(time / speed * 2 * pi)) * 255)
+        val = (self._gamma(color[0]*scaled_sin),
+               self._gamma(color[1]*scaled_sin),
+               self._gamma(color[2]*scaled_sin))
+        for i in range(self.leds):
+            self.np[i] = val
+
+    async def run(self):
+        time_ = 0.0
+        while True:
+            if self.led_state == LedManager.IDLE:
+                self._pulse(time_, (0, 1, 0), 3)
+            elif self.led_state == LedManager.PLAYING:
+                self._rainbow(time_)
+            time_ += 0.02
+            before = time.ticks_ms()
+            await self.np.async_write()
+            now = time.ticks_ms()
+            if before + 20 > now:
+                await asyncio.sleep_ms(20 - (now - before))

software/src/utils/playlistdb.py

@@ -0,0 +1,397 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
+
+import btree
+import random
+import time
+try:
+    import typing
+    from typing import TYPE_CHECKING, Iterable  # type: ignore
+except ImportError:
+    TYPE_CHECKING = False
+if TYPE_CHECKING:
+    class IPlaylist(typing.Protocol):
+        def getPaths(self) -> Iterable[bytes]: ...
+        def getCurrentPath(self) -> bytes: ...
+        def getNextPath(self) -> bytes | None: ...
+
+    class IPlaylistDB(typing.Protocol):
+        def getPlaylistForTag(self, tag: bytes) -> IPlaylist: ...
+else:
+    class IPlaylistDB(object):
+        ...
+
+    class IPlaylist(object):
+        ...
+
+
+class BTreeDB(IPlaylistDB):
+    SHUFFLE_NO = b'no'
+    SHUFFLE_YES = b'yes'
+    PERSIST_NO = b'no'
+    PERSIST_TRACK = b'track'
+    PERSIST_OFFSET = b'offset'
+    DEFAULT_SETTINGS = {
+        b'tagmode': b'tagremains'
+    }
+
+    class Playlist(IPlaylist):
+        def __init__(self, parent: "BTreeDB", tag: bytes, pos: int, persist, shuffle):
+            self.parent = parent
+            self.tag = tag
+            self.pos = pos
+            self.persist = persist
+            self.shuffle = shuffle
+            self.length = self.parent._getPlaylistLength(self.tag)
+            self._shuffle()
+
+        def _getPlaylistPos(self):
+            """
+            Gets the position to pass to parent._getPlaylistEntry etc.
+            """
+            if self.shuffle == BTreeDB.SHUFFLE_YES:
+                return self.shuffle_order[self.pos]
+            else:
+                return self.pos
+
+        def _shuffle(self, reshuffle=False):
+            if self.shuffle == BTreeDB.SHUFFLE_NO:
+                return
+
+            self.shuffle_seed = None
+            # Try to get seed from DB if persisted
+            if self.persist != BTreeDB.PERSIST_NO and not reshuffle:
+                self.shuffle_seed = self.parent._getPlaylistShuffleSeed(self.tag)
+            if self.shuffle_seed is None:
+                # Either not persisted or could not read from db
+                self.shuffle_seed = time.ticks_cpu()
+                if self.persist != BTreeDB.PERSIST_NO:
+                    self.parent._setPlaylistShuffleSeed(self.tag, self.shuffle_seed)
+            # TODO: Find an algorithm for shuffling that does not use O(n) memory for playlist of length n
+            random.seed(self.shuffle_seed)
+            entries = list(range(0, self.length))
+            # We don't have random.shuffle in micropython, so emulate it with random.choice
+            self.shuffle_order = []
+            while len(entries) > 0:
+                chosen = random.choice(entries)
+                self.shuffle_order.append(chosen)
+                entries.remove(chosen)
+
+        def getPaths(self):
+            """
+            Get entire playlist in storage order
+            """
+            return self.parent._getPlaylistValueIterator(self.tag)
+
+        def getCurrentPath(self):
+            """
+            Get path of file that should be played.
+            """
+            return self.parent._getPlaylistEntry(self.tag, self._getPlaylistPos())
+
+        def getNextPath(self):
+            """
+            Select next track and return path.
+            """
+            if self.pos + 1 >= self.length:
+                self.pos = 0
+                if self.persist != BTreeDB.PERSIST_NO:
+                    self.parent._setPlaylistPos(self.tag, self.pos)
+                    self.setPlaybackOffset(0)
+                    self._shuffle(True)
+                return None
+
+            self.pos += 1
+            if self.persist != BTreeDB.PERSIST_NO:
+                self.parent._setPlaylistPos(self.tag, self.pos)
+                self.setPlaybackOffset(0)
+            return self.getCurrentPath()
+
+        def getPrevPath(self):
+            """
+            Select prev track and return path.
+            """
+            if self.pos > 0:
+                self.pos -= 1
+            if self.persist != BTreeDB.PERSIST_NO:
+                self.parent._setPlaylistPos(self.tag, self.pos)
+                self.setPlaybackOffset(0)
+            return self.getCurrentPath()
+
+        def setPlaybackOffset(self, offset):
+            """
+            Store the current position in the track for PERSIST_OFFSET mode
+            """
+            if self.persist != BTreeDB.PERSIST_OFFSET:
+                return
+            self.parent._setPlaylistPosOffset(self.tag, offset)
+
+        def getPlaybackOffset(self):
+            """
+            Get the current position in the track for PERSIST_OFFSET mode
+            """
+            if self.persist != BTreeDB.PERSIST_OFFSET:
+                return 0
+            return self.parent._getPlaylistPosOffset(self.tag)
+
+    def __init__(self, db: btree.BTree, flush_func: typing.Callable | None = None):
+        self.db = db
+        self.flush_func = flush_func
+
+    @staticmethod
+    def _keyPlaylistPos(tag):
+        return b''.join([tag, b'/playlistpos'])
+
+    @staticmethod
+    def _keyPlaylistPosOffset(tag):
+        return b''.join([tag, b'/playlistposoffset'])
+
+    @staticmethod
+    def _keyPlaylistShuffle(tag):
+        return b''.join([tag, b'/playlistshuffle'])
+
+    @staticmethod
+    def _keyPlaylistShuffleSeed(tag):
+        return b''.join([tag, b'/playlistshuffleseed'])
+
+    @staticmethod
+    def _keyPlaylistPersist(tag):
+        return b''.join([tag, b'/playlistpersist'])
+
+    @staticmethod
+    def _keyPlaylistEntry(tag, pos):
+        return b''.join([tag, b'/playlist/', '{:05}'.format(pos).encode()])
+
+    @staticmethod
+    def _keyPlaylistStart(tag):
+        return b''.join([tag, b'/playlist/'])
+
+    @staticmethod
+    def _keyPlaylistStartEnd(tag):
+        return (b''.join([tag, b'/playlist/']),
+                b''.join([tag, b'/playlist0']))
+
+    def _flush(self):
+        """
+        Flush the database and call the flush_func if it was provided.
+        """
+        self.db.flush()
+        if self.flush_func is not None:
+            self.flush_func()
+
+    def _getPlaylistValueIterator(self, tag: bytes):
+        start, end = self._keyPlaylistStartEnd(tag)
+        return self.db.values(start, end)
+
+    def _getPlaylistEntry(self, tag: bytes, pos: int) -> bytes:
+        return self.db[self._keyPlaylistEntry(tag, pos)]
+
+    def _setPlaylistPos(self, tag: bytes, pos: int, flush=True):
+        self.db[self._keyPlaylistPos(tag)] = str(pos).encode()
+        if flush:
+            self._flush()
+
+    def _setPlaylistPosOffset(self, tag: bytes, offset: int, flush=True):
+        self.db[self._keyPlaylistPosOffset(tag)] = str(offset).encode()
+        if flush:
+            self._flush()
+
+    def _getPlaylistPosOffset(self, tag: bytes) -> int:
+        return int(self.db.get(self._keyPlaylistPosOffset(tag), b'0'))
+
+    def _getPlaylistShuffleSeed(self, tag: bytes) -> int | None:
+        try:
+            return int(self.db[self._keyPlaylistShuffleSeed(tag)])
+        except (ValueError, KeyError):
+            return None
+
+    def _setPlaylistShuffleSeed(self, tag, seed: int, flush=True):
+        self.db[self._keyPlaylistShuffleSeed(tag)] = str(seed).encode()
+        if flush:
+            self._flush()
+
+    def _getPlaylistLength(self, tag: bytes) -> int:
+        start, end = self._keyPlaylistStartEnd(tag)
+        for k in self.db.keys(end, start, btree.DESC):
+            # There is a bug in btreedb that causes an additional key after 'end' to be returned when iterating in
+            # descending order
+            # Check for this and skip it if needed
+            elements = k.split(b'/')
+            if len(elements) >= 2 and elements[1] == b'playlist':
+                last = k
+                break
+        elements = last.split(b'/')
+        if len(elements) != 3:
+            raise RuntimeError("Malformed playlist key")
+        return int(elements[2])+1
+
+    def _savePlaylist(self, tag, entries, persist, shuffle, flush=True):
+        self._deletePlaylist(tag, False)
+        for idx, entry in enumerate(entries):
+            self.db[self._keyPlaylistEntry(tag, idx)] = entry
+        self.db[self._keyPlaylistPersist(tag)] = persist
+        self.db[self._keyPlaylistShuffle(tag)] = shuffle
+        if flush:
+            self._flush()
+
+    def _deletePlaylist(self, tag, flush=True):
+        start_key, end_key = self._keyPlaylistStartEnd(tag)
+        for k in self.db.keys(start_key, end_key):
+            try:
+                del self.db[k]
+            except KeyError:
+                pass
+        for k in (self._keyPlaylistPos(tag), self._keyPlaylistPosOffset(tag),
+                  self._keyPlaylistPersist(tag), self._keyPlaylistShuffle(tag),
+                  self._keyPlaylistShuffleSeed(tag)):
+            try:
+                del self.db[k]
+            except KeyError:
+                pass
+        if flush:
+            self._flush()
+
+    def getPlaylistForTag(self, tag: bytes):
+        """
+        Lookup the playlist for 'tag' and return the Playlist object. Return None if no playlist exists for the given
+        tag.
+        """
+        persist = self.db.get(self._keyPlaylistPersist(tag), self.PERSIST_TRACK)
+        pos = 0
+        if persist != self.PERSIST_NO and self._keyPlaylistPos(tag) in self.db:
+            try:
+                pos = int(self.db[self._keyPlaylistPos(tag)])
+            except ValueError:
+                pass
+        if self._keyPlaylistEntry(tag, 0) not in self.db:
+            # Empty playlist
+            return None
+        if self._keyPlaylistEntry(tag, pos) not in self.db:
+            pos = 0
+        shuffle = self.db.get(self._keyPlaylistShuffle(tag), self.SHUFFLE_NO)
+        return self.Playlist(self, tag, pos, persist, shuffle)
+
+    def createPlaylistForTag(self, tag: bytes, entries: typing.Iterable[bytes], persist=PERSIST_TRACK,
+                             shuffle=SHUFFLE_NO):
+        """
+        Create and save a playlist for 'tag' and return the Playlist object. If a playlist already existed for 'tag' it
+        is overwritten.
+        """
+        assert persist in (self.PERSIST_NO, self.PERSIST_TRACK, self.PERSIST_OFFSET)
+        assert shuffle in (self.SHUFFLE_NO, self.SHUFFLE_YES)
+        self._savePlaylist(tag, entries, persist, shuffle)
+        return self.getPlaylistForTag(tag)
+
+    def getSetting(self, key: bytes | str) -> str:
+        if type(key) is str:
+            key = key.encode()
+        return self.db.get(b'settings/' + key, self.DEFAULT_SETTINGS[key]).decode()
+
+    def validate(self, dump=False):
+        """
+        Validate the structure of the playlist database.
+        """
+        result = True
+
+        def fail(msg):
+            nonlocal result
+            print(msg)
+            result = False
+
+        last_tag = None
+        last_pos = None
+        for k in self.db.keys():
+            fields = k.split(b'/')
+            if len(fields) <= 1:
+                fail(f'Malformed key {k!r}')
+                continue
+            if fields[0] == b'settings':
+                val = self.db[k].decode()
+                print(f'Setting {fields[1].decode()} = {val}')
+                continue
+            if last_tag != fields[0]:
+                last_tag = fields[0]
+                last_pos = None
+                if dump:
+                    print(f'Tag {fields[0]}')
+            if fields[1] == b'playlist':
+                if len(fields) != 3:
+                    fail(f'Malformed playlist entry: {k!r}')
+                    continue
+                try:
+                    idx = int(fields[2])
+                except ValueError:
+                    fail(f'Malformed playlist entry: {k!r}')
+                    continue
+                if len(fields[2]) != 5:
+                    fail(f'Bad index width for {last_tag} at {idx}')
+                if (last_pos is not None and last_pos + 1 != idx) or \
+                   (last_pos is None and idx != 0):
+                    fail(f'Bad playlist entry sequence for {last_tag} at {idx}')
+                last_pos = idx
+                if dump:
+                    print(f'\tTrack {idx}: {self.db[k]!r}')
+            elif fields[1] == b'playlistpos':
+                val = self.db[k]
+                try:
+                    idx = int(val)
+                except ValueError:
+                    fail(f'Malformed playlist position: {val!r}')
+                    continue
+                if 0 > idx or idx > last_pos:
+                    fail(f'Playlist position out of range for {last_tag}: {idx}')
+                elif dump:
+                    print(f'\tPosition {idx}')
+            elif fields[1] == b'playlistshuffle':
+                val = self.db[k]
+                if val not in (b'no', b'yes'):
+                    fail(f'Bad playlistshuffle value for {last_tag}: {val!r}')
+                if dump and val == b'yes':
+                    print('\tShuffle')
+            elif fields[1] == b'playlistpersist':
+                val = self.db[k]
+                if val not in (b'no', b'track', b'offset'):
+                    fail(f'Bad playlistpersist value for {last_tag}: {val!r}')
+                elif dump:
+                    print(f'\tPersist: {val.decode()}')
+            elif fields[1] == b'playlistshuffleseed':
+                val = self.db[k]
+                try:
+                    _ = int(val)
+                except ValueError:
+                    fail(f' Bad playlistshuffleseed value for {last_tag}: {val!r}')
+            elif fields[1] == b'playlistposoffset':
+                val = self.db[k]
+                try:
+                    _ = int(val)
+                except ValueError:
+                    fail(f' Bad playlistposoffset value for {last_tag}: {val!r}')
+            else:
+                fail(f'Unknown key {k!r}')
+        return result
+
+
+class BTreeFileManager:
+    """
+    Context manager for a BTreeDB playlist db backed by a file in the filesystem.
+    """
+    def __init__(self, db_path: str | bytes):
+        self.db_path = db_path
+
+    def __enter__(self):
+        try:
+            self.db_file = open(self.db_path, 'r+b')
+        except OSError:
+            self.db_file = open(self.db_path, 'w+b')
+        try:
+            self.db = btree.open(self.db_file, pagesize=512, cachesize=1024)
+            btdb = BTreeDB(self.db, lambda: self.db_file.flush())
+            btdb.validate(True)  # while testing, validate and dump DB on startup
+            return btdb
+        except Exception:
+            self.db_file.close()
+            raise
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.db.close()
+        self.db_file.close()

software/src/utils/timer.py

@@ -4,6 +4,7 @@
 import asyncio
 import heapq
 import time
+from utils import safe_callback
 
 TIMER_DEBUG = True
 
@@ -22,6 +23,7 @@ class TimerManager(object):
 
     def schedule(self, when, what):
         cur_nearest = self.timers[0][0] if len(self.timers) > 0 else None
+        self._remove_timer(what)  # Ensure timer is not already scheduled
         heapq.heappush(self.timers, (when, what))
         if cur_nearest is None or cur_nearest > self.timers[0][0]:
             # New timer is closer than previous closest timer
@@ -31,41 +33,53 @@ class TimerManager(object):
             self.worker_event.set()
 
     def cancel(self, what):
-        try:
-            (when, _), i = next(filter(lambda item: item[0][1] == what, zip(self.timers, range(len(self.timers)))))
-        except StopIteration:
-            return False
-        del self.timers[i]
-        heapq.heapify(self.timers)
-        if i == 0:
+        remove_idx = self._remove_timer(what)
+        if remove_idx == 0:
             # Cancel timer was closest timer
             if self.timer_debug:
                 print("cancel: wake")
             self.worker_event.set()
         return True
 
+    def _remove_timer(self, what):
+        try:
+            (when, _), i = next(filter(lambda item: item[0][1] == what, zip(self.timers, range(len(self.timers)))))
+        except StopIteration:
+            return False
+        del self.timers[i]
+        heapq.heapify(self.timers)
+        return i
+
+    def _next_timeout(self):
+        if len(self.timers) == 0:
+            if self.timer_debug:
+                print("timer: worker: queue empty")
+            return None
+        cur_nearest = self.timers[0][0]
+        next_timeout = cur_nearest - time.ticks_ms()
+        if self.timer_debug:
+            if next_timeout > 0:
+                print(f"timer: worker: next is {self.timers[0]}, sleep {next_timeout} ms")
+            else:
+                print(f"timer: worker: {self.timers[0]} elapsed @{cur_nearest}, delay {-next_timeout} ms")
+        return next_timeout
+
+    async def _wait(self, timeout):
+        try:
+            await asyncio.wait_for_ms(self.worker_event.wait(), timeout)
+            if self.timer_debug:
+                print("timer: worker: event")
+            # got woken up due to event
+            self.worker_event.clear()
+            return True
+        except asyncio.TimeoutError:
+            return False
+
     async def _timer_worker(self):
         while True:
-            if len(self.timers) == 0:
-                # Nothing to do
-                await self.worker_event.wait()
-                if self.timer_debug:
-                    print("_timer_worker: event 0")
-                self.worker_event.clear()
-                continue
-            cur_nearest = self.timers[0][0]
-            wait_time = cur_nearest - time.ticks_ms()
-            if wait_time > 0:
-                if self.timer_debug:
-                    print(f"_timer_worker: next is {self.timers[0]}, sleep {wait_time} ms")
-                try:
-                    await asyncio.wait_for_ms(self.worker_event.wait(), wait_time)
-                    if self.timer_debug:
-                        print("_timer_worker: event 1")
-                    # got woken up due to event
-                    self.worker_event.clear()
-                    continue
-                except asyncio.TimeoutError:
-                    pass
-            _, callback = heapq.heappop(self.timers)
-            callback()
+            next_timeout = self._next_timeout()
+            if next_timeout is None or next_timeout > 0:
+                await self._wait(next_timeout)
+            else:
+                _, callback = heapq.heappop(self.timers)
+                safe_callback(callback, "timer callback")

software/src/webserver.py

@@ -0,0 +1,74 @@
+'''
+SPDX-License-Identifier: MIT
+Copyright (c) 2024-2025 Stefan Kratochwil <Kratochwil-LA@gmx.de>
+'''
+
+import asyncio
+
+from microdot import Microdot
+
+webapp = Microdot()
+server = None
+config = None
+app = None
+nfc = None
+
+
+def start_webserver(config_, app_):
+    global server, config, app, nfc
+    server = asyncio.create_task(webapp.start_server(port=80))
+    config = config_
+    app = app_
+    nfc = app.get_nfc()
+
+
+@webapp.before_request
+async def before_request_handler(request):
+    if request.method in ['PUT', 'POST'] and app.is_playing():
+        return "Cannot write to device while playback is active", 503
+    app.reset_idle_timeout()
+
+
+@webapp.route('/')
+async def index(request):
+    print("wohoo, a guest :)")
+    print(f"  app: {request.app}")
+    print(f"  client: {request.client_addr}")
+    print(f"  method: {request.method}")
+    print(f"  url: {request.url}")
+    print(f"  headers: {request.headers}")
+    print(f"  cookies: {request.cookies}")
+    return "TonberryPico says 'Hello World!'"
+
+
+@webapp.route('/api/v1/filesystem', methods=['POST'])
+async def filesystem_post(request):
+    # curl -X POST -d "burp" http://192.168.4.1/api/v1/filesystem
+    print(request)
+    return {'success': False}
+
+
+@webapp.route('/api/v1/playlist', methods=['POST'])
+async def playlist_post(request):
+    print(request)
+    return {'success': False}
+
+
+@webapp.route('/api/v1/config', methods=['GET'])
+async def config_get(request):
+    return config.get_config()
+
+
+@webapp.route('/api/v1/config', methods=['PUT'])
+async def config_put(request):
+    try:
+        config.set_config(request.json)
+    except ValueError as ex:
+        return str(ex), 400
+    return '', 204
+
+
+@webapp.route('/api/v1/last_tag_uid', methods=['GET'])
+async def last_tag_uid_get(request):
+    tag, _ = nfc.get_last_uid()
+    return {'tag': tag}

software/tests/mocks/btree.py

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
+
+from typing import Iterable
+
+
+class BTree:
+    def close(self): ...
+
+    def values(self, start_key: str | bytes, end_key: str | bytes | None = None, flags=None) -> Iterable[str | bytes]:
+        pass
+
+    def __setitem__(self, key: str | bytes, val: str | bytes): ...
+
+    def flush(self): ...
+
+    def get(self, key: str | bytes, default: str | bytes | None = None) -> str | bytes: ...
+
+
+def open(dbfile) -> BTree:
+    pass
+
+
+DESC = 1
+INCL = 2

software/tests/mocks/micropython.py

@@ -1,2 +1,5 @@
 # SPDX-License-Identifier: MIT
 # Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
+
+def const(x):
+    return x

software/tests/test_playerapp.py

@@ -0,0 +1,336 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
+
+import app
+import builtins
+import pytest  # type: ignore
+import time
+import utils
+
+
+@pytest.fixture
+def micropythonify():
+    def time_ticks_ms():
+        return time.time_ns() // 1000000
+    time.ticks_ms = time_ticks_ms
+    yield
+    del time.ticks_ms
+
+
+class FakeFile:
+    def __init__(self, filename, mode):
+        self.filename = filename
+        self.mode = mode
+        self.closed = False
+
+    def close(self):
+        self.closed = True
+
+
+class FakeMp3Player:
+    def __init__(self):
+        self.volume: int | None = None
+        self.track: FakeFile | None = None
+
+    def set_volume(self, vol: int):
+        self.volume = vol
+
+    def play(self, track: FakeFile, offset: int):
+        self.track = track
+
+    def stop(self):
+        self.track = None
+
+
+class FakeTimerManager:
+    def __init__(self):
+        self.queued = []
+
+    def cancel(self, timer):
+        self.queued = [(elem[0], elem[1], True) if elem[1] == timer else elem for elem in self.queued]
+
+    def schedule(self, when, what):
+        self.queued.append((when, what, False))
+
+    def testing_run_queued(self):
+        queued = self.queued
+        self.queued = []
+        for when, what, canceled in queued:
+            if not canceled:
+                what()
+
+
+class FakeNfcReader:
+    tag_callback = None
+
+    def __init__(self, tag_callback=None):
+        FakeNfcReader.tag_callback = tag_callback
+
+
+class FakeButtons:
+    def __init__(self): pass
+
+
+class FakePlaylistDb:
+    class FakePlaylist:
+        def __init__(self, parent, pos=0):
+            self.parent = parent
+            self.pos = 0
+
+        def getCurrentPath(self):
+            return self.parent.tracklist[self.pos]
+
+        def getNextPath(self):
+            self.pos += 1
+            if self.pos >= len(self.parent.tracklist):
+                return None
+            return self.parent.tracklist[self.pos]
+
+        def getPlaybackOffset(self):
+            return 0
+
+    def __init__(self, tracklist=[b'test/path.mp3']):
+        self.tracklist = tracklist
+
+    def getPlaylistForTag(self, tag: bytes):
+        return self.FakePlaylist(self)
+
+    def getSetting(self, key: bytes | str):
+        if key == 'tagmode':
+            return 'tagremains'
+        return None
+
+
+class FakeHwconfig:
+    def __init__(self):
+        self.powered = True
+        self.on_battery = False
+
+    def power_off(self):
+        self.powered = False
+
+    def get_on_battery(self):
+        return self.on_battery
+
+
+class FakeLeds:
+    IDLE = 0
+    PLAYING = 1
+
+    def __init__(self):
+        self.state = None
+
+    def set_state(self, state):
+        self.state = state
+
+
+class FakeConfig:
+    def __init__(self): pass
+
+    def get_led_count(self):
+        return 1
+
+    def get_idle_timeout(self):
+        return 60
+
+    def get_tag_timeout(self):
+        return 5
+
+
+def fake_open(filename, mode):
+    return FakeFile(filename, mode)
+
+
+@pytest.fixture
+def faketimermanager(monkeypatch):
+    fake_timer_manager = FakeTimerManager()
+    monkeypatch.setattr(utils.timer.TimerManager, '_instance', fake_timer_manager)
+    yield fake_timer_manager
+
+
+def _makedeps(mp3player=FakeMp3Player, nfcreader=FakeNfcReader, buttons=FakeButtons,
+              playlistdb=FakePlaylistDb, hwconfig=FakeHwconfig, leds=FakeLeds, config=FakeConfig):
+    return app.Dependencies(mp3player=lambda _: mp3player() if callable(mp3player) else mp3player,
+                            nfcreader=lambda x: nfcreader(x) if callable(nfcreader) else nfcreader,
+                            buttons=lambda _: buttons() if callable(buttons) else buttons,
+                            playlistdb=lambda _: playlistdb() if callable(playlistdb) else playlistdb,
+                            hwconfig=lambda _: hwconfig() if callable(hwconfig) else hwconfig,
+                            leds=lambda _: leds() if callable(leds) else leds,
+                            config=lambda _: config() if callable(config) else config)
+
+
+def test_construct_app(micropythonify, faketimermanager):
+    fake_mp3 = FakeMp3Player()
+    deps = _makedeps(mp3player=fake_mp3)
+    dut = app.PlayerApp(deps)
+    fake_mp3 = dut.player
+    assert fake_mp3.volume is not None
+
+
+def test_load_playlist_on_tag(micropythonify, faketimermanager, monkeypatch):
+    fake_db = FakePlaylistDb()
+    fake_mp3 = FakeMp3Player()
+    deps = _makedeps(mp3player=fake_mp3, playlistdb=fake_db)
+    app.PlayerApp(deps)
+    with monkeypatch.context() as m:
+        m.setattr(builtins, 'open', fake_open)
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'test/path.mp3'
+        assert "r" in fake_mp3.track.mode
+        assert "b" in fake_mp3.track.mode
+
+
+def test_playlist_seq(micropythonify, faketimermanager, monkeypatch):
+    fake_db = FakePlaylistDb([b'track1.mp3', b'track2.mp3', b'track3.mp3'])
+    fake_mp3 = FakeMp3Player()
+    deps = _makedeps(mp3player=fake_mp3, playlistdb=fake_db)
+    dut = app.PlayerApp(deps)
+    with monkeypatch.context() as m:
+        m.setattr(builtins, 'open', fake_open)
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'track1.mp3'
+
+        fake_mp3.track = None
+        dut.onPlaybackDone()
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'track2.mp3'
+
+        fake_mp3.track = None
+        dut.onPlaybackDone()
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'track3.mp3'
+
+        fake_mp3.track = None
+        dut.onPlaybackDone()
+        assert fake_mp3.track is None
+
+
+def test_playlist_unknown_tag(micropythonify, faketimermanager, monkeypatch):
+    class FakeNoPlaylistDb:
+        def getPlaylistForTag(self, tag):
+            return None
+
+        def getSetting(self, key: bytes | str):
+            return None
+
+    fake_db = FakeNoPlaylistDb()
+    fake_mp3 = FakeMp3Player()
+    deps = _makedeps(mp3player=fake_mp3, playlistdb=fake_db)
+    app.PlayerApp(deps)
+    with monkeypatch.context() as m:
+        m.setattr(builtins, 'open', fake_open)
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_mp3.track is None
+
+
+def test_tagmode_startstop(micropythonify, faketimermanager, monkeypatch):
+    class MyFakePlaylistDb(FakePlaylistDb):
+        def __init__(self, tracklist=[b'test/path.mp3']):
+            super().__init__(tracklist)
+
+        def getSetting(self, key: bytes | str):
+            if key == 'tagmode':
+                return 'tagstartstop'
+            return None
+
+    fake_db = MyFakePlaylistDb()
+    fake_mp3 = FakeMp3Player()
+    deps = _makedeps(mp3player=fake_mp3, playlistdb=fake_db)
+    app.PlayerApp(deps)
+    with monkeypatch.context() as m:
+        m.setattr(builtins, 'open', fake_open)
+        # Present tag to start playback
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'test/path.mp3'
+        # Removing tag should not stop playback
+        FakeNfcReader.tag_callback.onTagChange(None)
+        faketimermanager.testing_run_queued()
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'test/path.mp3'
+        # Presenting tag should stop playback
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_mp3.track is None
+        # Nothing should change here
+        FakeNfcReader.tag_callback.onTagChange(None)
+        faketimermanager.testing_run_queued()
+        assert fake_mp3.track is None
+        # Presenting tag again should start playback again
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'test/path.mp3'
+
+
+def test_tagmode_remains(micropythonify, faketimermanager, monkeypatch):
+    class MyFakePlaylistDb(FakePlaylistDb):
+        def __init__(self, tracklist=[b'test/path.mp3']):
+            super().__init__(tracklist)
+
+        def getSetting(self, key: bytes | str):
+            if key == 'tagmode':
+                return 'tagremains'
+            return None
+
+    fake_db = MyFakePlaylistDb()
+    fake_mp3 = FakeMp3Player()
+    deps = _makedeps(mp3player=fake_mp3, playlistdb=fake_db)
+    app.PlayerApp(deps)
+    with monkeypatch.context() as m:
+        m.setattr(builtins, 'open', fake_open)
+        # Present tag to start playback
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'test/path.mp3'
+        # Remove tag to stop playback
+        FakeNfcReader.tag_callback.onTagChange(None)
+        faketimermanager.testing_run_queued()
+        assert fake_mp3.track is None
+        # Presenting tag again should start playback again
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_mp3.track is not None
+        assert fake_mp3.track.filename == b'test/path.mp3'
+
+
+def test_led_state(micropythonify, faketimermanager, monkeypatch):
+    fake_leds = FakeLeds()
+    deps = _makedeps(leds=fake_leds)
+    app.PlayerApp(deps)
+    assert fake_leds.state == FakeLeds.IDLE
+    with monkeypatch.context() as m:
+        m.setattr(builtins, 'open', fake_open)
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        assert fake_leds.state == FakeLeds.PLAYING
+        FakeNfcReader.tag_callback.onTagChange(None)
+        faketimermanager.testing_run_queued()
+        assert fake_leds.state == FakeLeds.IDLE
+
+
+def test_idle_shutdown_after_start(micropythonify, faketimermanager, monkeypatch):
+    fake_hwconfig = FakeHwconfig()
+    fake_hwconfig.on_battery = True
+    deps = _makedeps(hwconfig=fake_hwconfig)
+    app.PlayerApp(deps)
+    assert fake_hwconfig.powered
+    faketimermanager.testing_run_queued()
+    assert not fake_hwconfig.powered
+
+
+def test_idle_shutdown_after_playback(micropythonify, faketimermanager, monkeypatch):
+    fake_hwconfig = FakeHwconfig()
+    fake_hwconfig.on_battery = True
+    deps = _makedeps(hwconfig=fake_hwconfig)
+    app.PlayerApp(deps)
+    assert fake_hwconfig.powered
+    with monkeypatch.context() as m:
+        m.setattr(builtins, 'open', fake_open)
+        FakeNfcReader.tag_callback.onTagChange([23, 42, 1, 2, 3])
+        faketimermanager.testing_run_queued()
+        assert fake_hwconfig.powered
+        # Stop playback
+        FakeNfcReader.tag_callback.onTagChange(None)
+        faketimermanager.testing_run_queued()
+        # Elapse idle timer
+        faketimermanager.testing_run_queued()
+        assert not fake_hwconfig.powered

software/tests/utils_test/test_btreedb.py

@@ -0,0 +1,197 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
+
+import btree
+import pytest
+import time
+from utils import BTreeDB
+
+
+@pytest.fixture(autouse=True)
+def micropythonify():
+    def time_ticks_cpu():
+        return time.time_ns()
+    time.ticks_cpu = time_ticks_cpu
+    yield
+    del time.ticks_cpu
+
+
+class FakeDB:
+    def __init__(self, contents):
+        self.contents = contents
+        self.saved_contents = dict(contents)
+
+    def flush(self):
+        self.saved_contents = dict(self.contents)
+
+    def values(self, start_key=None, end_key=None, flags=None):
+        res = []
+        for key in sorted(self.contents):
+            if start_key is not None and start_key > key:
+                continue
+            if end_key is not None and end_key <= key:
+                break
+            yield self.contents[key]
+            res.append(self.contents[key])
+
+    def keys(self, start_key=None, end_key=None, flags=None):
+        keys = []
+        if flags is not None and flags & btree.DESC != 0:
+            start_key, end_key = end_key, start_key
+        for key in sorted(self.contents):
+            if start_key is not None and start_key > key:
+                continue
+            if end_key is not None and end_key <= key:
+                break
+            keys.append(key)
+        if flags is not None and flags & btree.DESC != 0:
+            keys.reverse()
+        return iter(keys)
+
+    def get(self, key, default=None):
+        return self.contents.get(key, default)
+
+    def __getitem__(self, key):
+        return self.contents[key]
+
+    def __setitem__(self, key, val):
+        self.contents[key] = val
+
+    def __delitem__(self, key):
+        del self.contents[key]
+
+    def __contains__(self, key):
+        return key in self.contents
+
+
+def test_playlist_load():
+    contents = {b'foo/part': b'no',
+                b'foo/playlist/00000': b'track1',
+                b'foo/playlist/00001': b'track2',
+                b'foo/playlisttt': b'no'
+                }
+    uut = BTreeDB(FakeDB(contents))
+    pl = uut.getPlaylistForTag(b'foo')
+    assert list(pl.getPaths()) == [b'track1', b'track2']
+    assert pl.getCurrentPath() == b'track1'
+
+
+def test_playlist_nextpath():
+    contents = FakeDB({b'foo/part': b'no',
+                       b'foo/playlist/00000': b'track1',
+                       b'foo/playlist/00001': b'track2',
+                       b'foo/playlisttt': b'no'
+                       })
+    uut = BTreeDB(contents)
+    pl = uut.getPlaylistForTag(b'foo')
+    assert pl.getNextPath() == b'track2'
+    assert contents.saved_contents[b'foo/playlistpos'] == b'1'
+
+
+def test_playlist_nextpath_last():
+    contents = FakeDB({b'foo/playlist/00000': b'track1',
+                       b'foo/playlist/00001': b'track2',
+                       b'foo/playlistpos': b'1'
+                       })
+    uut = BTreeDB(contents)
+    pl = uut.getPlaylistForTag(b'foo')
+    assert pl.getNextPath() is None
+    assert contents.saved_contents[b'foo/playlistpos'] == b'0'
+
+
+def test_playlist_create():
+    contents = FakeDB({b'foo/playlist/00000': b'track1',
+                       b'foo/playlist/00001': b'track2',
+                       b'foo/playlistpos': b'1'
+                       })
+    newplaylist = [b'never gonna give you up.mp3', b'durch den monsun.mp3']
+    uut = BTreeDB(contents)
+    new_pl = uut.createPlaylistForTag(b'foo', newplaylist)
+    assert list(new_pl.getPaths()) == newplaylist
+    assert new_pl.getCurrentPath() == newplaylist[0]
+    assert uut.validate(True)
+
+
+def test_playlist_load_notexist():
+    contents = FakeDB({b'foo/playlist/00000': b'track1',
+                       b'foo/playlist/00001': b'track2',
+                       b'foo/playlistpos': b'1'
+                       })
+    uut = BTreeDB(contents)
+    assert uut.getPlaylistForTag(b'notfound') is None
+
+
+def test_playlist_starts_at_beginning_in_persist_no_mode():
+    contents = FakeDB({b'foo/playlist/00000': b'track1',
+                       b'foo/playlist/00001': b'track2',
+                       b'foo/playlistpersist': b'no',
+                       })
+    uut = BTreeDB(contents)
+    pl = uut.getPlaylistForTag(b'foo')
+    assert pl.getCurrentPath() == b'track1'
+    assert pl.getNextPath() == b'track2'
+    del pl
+    pl = uut.getPlaylistForTag(b'foo')
+    assert pl.getCurrentPath() == b'track1'
+
+
+@pytest.mark.parametrize("mode", [b'no', b'track'])
+def test_playlist_ignores_offset_in_other_modes(mode):
+    contents = FakeDB({b'foo/playlist/00000': b'track1',
+                       b'foo/playlist/00001': b'track2',
+                       b'foo/playlistpersist': mode,
+                       })
+    uut = BTreeDB(contents)
+    pl = uut.getPlaylistForTag(b'foo')
+    pl.setPlaybackOffset(42)
+    del pl
+    pl = uut.getPlaylistForTag(b'foo')
+    assert pl.getPlaybackOffset() == 0
+
+
+def test_playlist_stores_offset_in_offset_mode():
+    contents = FakeDB({b'foo/playlist/00000': b'track1',
+                       b'foo/playlist/00001': b'track2',
+                       b'foo/playlistpersist': b'offset',
+                       })
+    uut = BTreeDB(contents)
+    pl = uut.getPlaylistForTag(b'foo')
+    pl.setPlaybackOffset(42)
+    del pl
+    pl = uut.getPlaylistForTag(b'foo')
+    assert pl.getPlaybackOffset() == 42
+
+
+def test_playlist_resets_offset_on_next_track():
+    contents = FakeDB({b'foo/playlist/00000': b'track1',
+                       b'foo/playlist/00001': b'track2',
+                       b'foo/playlistpersist': b'offset',
+                       })
+    uut = BTreeDB(contents)
+    pl = uut.getPlaylistForTag(b'foo')
+    pl.setPlaybackOffset(42)
+    assert pl.getNextPath() == b'track2'
+    del pl
+    pl = uut.getPlaylistForTag(b'foo')
+    assert pl.getCurrentPath() == b'track2'
+    assert pl.getPlaybackOffset() == 0
+
+
+def test_playlist_shuffle():
+    contents_dict = {b'foo/playlistpersist': b'track',
+                     b'foo/playlistshuffle': b'yes',
+                     }
+    for i in range(256):
+        contents_dict['foo/playlist/{:05}'.format(i).encode()] = 'track{}'.format(i).encode()
+    contents = FakeDB(contents_dict)
+    uut = BTreeDB(contents)
+    pl = uut.getPlaylistForTag(b'foo')
+    shuffled = False
+    last_idx = int(pl.getCurrentPath().removeprefix(b'track'))
+    while (t := pl.getNextPath()) is not None:
+        idx = int(t.removeprefix(b'track'))
+        if idx != last_idx + 1:
+            shuffled = True
+            break
+    # A false negative ratr of 1 in 256! should be good enough for this test
+    assert shuffled

software/tools/standalone-mp3/CMakeLists.txt

@@ -10,6 +10,7 @@ include(../../lib/micropython/lib/pico-sdk/pico_sdk_init.cmake)
 project(standalone_mp3)
 
 option(ENABLE_WRITE_TEST "Enable write test" OFF)
+option(ENABLE_READ_TEST "Enable read test" ON)
 option(ENABLE_PLAY_TEST "Enable mp3 playback test" OFF)
 option(ENABLE_SD_READ_CRC "Enable crc check when reading from sd card" OFF)
 option(ENABLE_SD_DEBUG "Enable debug output for sd card driver" OFF)
@@ -37,6 +38,10 @@ if(ENABLE_WRITE_TEST)
     target_compile_definitions(standalone_mp3 PRIVATE WRITE_TEST)
 endif()
 
+if(ENABLE_READ_TEST)
+    target_compile_definitions(standalone_mp3 PRIVATE READ_TEST)
+endif()
+
 if(ENABLE_PLAY_TEST)
     target_compile_definitions(standalone_mp3 PRIVATE PLAY_TEST)
 endif()

software/tools/standalone-mp3/main.c

@@ -157,7 +157,7 @@ static void write_test(struct sd_context *sd_context)
             data_buffer[i] ^= 0xff;
         }
 
-        if(!sd_writeblock(sd_context, 0, data_buffer)) {
+        if (!sd_writeblock(sd_context, 0, data_buffer)) {
             printf("sd_writeblock failed\n");
             return;
         }
@@ -165,6 +165,20 @@ static void write_test(struct sd_context *sd_context)
     } while (data_buffer[SD_SECTOR_SIZE - 1] != 0xAA);
 }
 
+static void read_test(struct sd_context *sd_context)
+{
+    uint8_t data_buffer[512];
+    const uint64_t before = time_us_64();
+    for (int block = 0; block < 245760; ++block) {
+        if (!sd_readblock(sd_context, block, data_buffer)) {
+            printf("sd_readblock(%d) failed\n", block);
+            return;
+        }
+    }
+    const uint64_t elapsed = time_us_64() - before;
+    printf("%llu ms elapsed, %f kB/s\n", elapsed / 1000LLU, 128 * 1024.f / (elapsed / 1000000.f));
+}
+
 int main()
 {
     stdio_init_all();
@@ -172,10 +186,23 @@ int main()
 
     struct sd_context sd_context;
 
-    if (!sd_init(&sd_context, 3, 4, 2, 5, 15000000)) {
+#define DRIVE_STRENGTH GPIO_DRIVE_STRENGTH_8MA
+#define SLEW_RATE GPIO_SLEW_RATE_SLOW
+
+    gpio_set_drive_strength(2, DRIVE_STRENGTH);
+    gpio_set_slew_rate(2, SLEW_RATE);
+    gpio_set_drive_strength(3, DRIVE_STRENGTH);
+    gpio_set_slew_rate(3, SLEW_RATE);
+
+    if (!sd_init(&sd_context, 3, 4, 2, 5, 25000000)) {
+        printf("sd_init failed\n");
         return 1;
     }
 
+#ifdef READ_TEST
+    read_test(&sd_context);
+#endif
+
 #ifdef WRITE_TEST
     write_test(&sd_context);
 #endif