feat: Change LED pattern based on playback state

Move the LED control to the utils.LedManager class. For the first
implementation, support two LED patterns 'idle' and 'playing'.

Extend the PlayerApp to set the LED pattern based on playback state.

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

software/src/main.py

@@ -9,7 +9,6 @@ import micropython
 import network
 import os
 import time
-from math import pi, sin, pow
 
 # Own modules
 import app
@@ -18,7 +17,7 @@ from mfrc522 import MFRC522
 from mp3player import MP3Player
 from nfc import Nfc
 from rp2_neopixel import NeoPixel
-from utils import BTreeFileManager, Buttons, SDContext, TimerManager
+from utils import BTreeFileManager, Buttons, SDContext, TimerManager, LedManager
 
 try:
     import hwconfig
@@ -31,28 +30,6 @@ 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
 
@@ -71,7 +48,6 @@ def run():
     asyncio.new_event_loop()
     # Setup LEDs
     np = NeoPixel(hwconfig.LED_DIN, hwconfig.LED_COUNT, sm=1)
-    asyncio.create_task(rainbow(np))
 
     # Wifi with default config
     setup_wifi()
@@ -101,7 +77,8 @@ def run():
                                     buttons=lambda the_app: Buttons(the_app, pin_volup=hwconfig.BUTTON_VOLUP,
                                                                     pin_voldown=hwconfig.BUTTON_VOLDOWN,
                                                                     pin_next=hwconfig.BUTTON_NEXT),
-                                    playlistdb=lambda _: playlistdb)
+                                    playlistdb=lambda _: playlistdb,
+                                    leds=lambda _: LedManager(np))
             the_app = app.PlayerApp(deps)
 
             # Start