tools: standalone_mp3: Add read test, increase speed to 25 MHz

Add a read test to the SD tests in standalone_mp3, and also apply the
drive strength setup and higher clockrate from board_Rev1.py.

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

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