Add CDC serial for a secret reset knock.

.github/workflows/cmake.yml

@@ -20,7 +20,6 @@ jobs:
             name: Linux
             cache-key: linux
             cmake-args: '-DPIMORONI_PICO_PATH=$GITHUB_WORKSPACE/pimoroni-pico -DPICO_SDK_PATH=$GITHUB_WORKSPACE/pico-sdk'
-            apt-packages: clang-tidy gcc-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib
 
     runs-on: ${{matrix.os}}
 
@@ -60,11 +59,10 @@ jobs:
         ref: sdk-2.0.0
         submodules: true
 
-    # Linux deps
-    - name: Install deps
-      if: runner.os == 'Linux'
-      run: |
-        sudo apt update && sudo apt install ${{matrix.apt-packages}}
+    - name: Install Arm GNU Toolchain (arm-none-eabi-gcc)
+      uses: carlosperate/arm-none-eabi-gcc-action@v1
+      with:
+        release: '12.2.Rel1'
 
     - name: Create Build Environment
       run: cmake -E make_directory ${{runner.workspace}}/build

CMakeLists.txt

@@ -25,9 +25,9 @@ include(drivers/button/button)
 add_executable(${NAME})
 
 target_sources(${NAME} PUBLIC
-    ${CMAKE_CURRENT_SOURCE_DIR}/src/main.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/src/i2s_audio.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/src/usb_descriptors.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/main.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/i2s_audio.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/usb_descriptors.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/src/board.cpp
 )
 

README.md

@@ -1,14 +1,23 @@
-# Pico TinyUSB i2s Speaker
+# Picade Max: Audio And Volume Control Board
 
-A USB speaker firmware for the RP2040/Pico using TinyUSB and i2s.
+Firmware for the Picade Max audio board. Includes encoder volume control with
+push-button mute.
+
+## Status LED
+
+* Red - Lights up when board is muted
+* Green - Should idle blink at 1s intervals, and flash quickly when audio is streaming
+* Blue - Brightness indicates volume
 
 ## Updating the firmware for the board
 
 Push the volume button in for 2 seconds and hold.
 
+Alternatively run `echo "multiverse:_usb" > /dev/serial/by-id/usb-Pimoroni_Picade_USB_Audio_*-if02` via SSH or a terminal.
+
 This will put the audio board into bootloader mode.
 
-If you're using Recalbox, you may see a pop up that states a new USB device named RPI-RP2 has been discovered and asks you if you wish to initialise.  You can ignore this screen.
+If you're using Recalbox, you may see a pop up that states a new USB device named RPI-RP2 has been discovered and asks you if you wish to initialise. You can ignore this screen.
 
 If you don't have any other external USB devices plugged in, you should be able to access the bootloader at:
 

reset-picade-audio.py

@@ -0,0 +1,8 @@
+import glob
+import serial
+
+picade = glob.glob("/dev/serial/by-id/usb-Pimoroni_Picade_USB_Audio_*")[0]
+
+device = serial.Serial(picade)
+
+device.write(b"multiverse:_usb")

src/board.cpp

@@ -20,52 +20,51 @@ Button button(BUTTON, pimoroni::ACTIVE_LOW, 0);
 bool pressed = false;
 absolute_time_t pressed_time;
 
-extern "C" {
-    void system_init() {
-        // Apply a modest overvolt, default is 1.10v.
-        // this is required for a stable 250MHz on some RP2040s
-        vreg_set_voltage(VREG_VOLTAGE_1_20);
-        sleep_ms(10);
-        set_sys_clock_khz(250000, true);
 
-        // DCDC PSM control
-        // 0: PFM mode (best efficiency)
-        // 1: PWM mode (improved ripple)
-        gpio_init(PIN_DCDC_PSM_CTRL);
-        gpio_set_dir(PIN_DCDC_PSM_CTRL, GPIO_OUT);
-        gpio_put(PIN_DCDC_PSM_CTRL, 1); // PWM mode for less Audio noise
+void system_init() {
+    // Apply a modest overvolt, default is 1.10v.
+    // this is required for a stable 250MHz on some RP2040s
+    vreg_set_voltage(VREG_VOLTAGE_1_20);
+    sleep_ms(10);
+    set_sys_clock_khz(250000, true);
 
-        volume_control.init();
-    }
+    // DCDC PSM control
+    // 0: PFM mode (best efficiency)
+    // 1: PWM mode (improved ripple)
+    gpio_init(PIN_DCDC_PSM_CTRL);
+    gpio_set_dir(PIN_DCDC_PSM_CTRL, GPIO_OUT);
+    gpio_put(PIN_DCDC_PSM_CTRL, 1); // PWM mode for less Audio noise
 
-    int32_t get_volume_delta() {
-        return volume_control.delta();
-    }
+    volume_control.init();
+}
 
-    bool get_mute_button_pressed() {
-        return button.read();
-    }
+int32_t get_volume_delta() {
+    return volume_control.delta();
+}
+
+bool get_mute_button_pressed() {
+    return button.read();
+}
 
-    void handle_mute_button_held() {
+void handle_mute_button_held() {
 #ifdef DEBUG_BOOTLOADER_SHORTCUT
-        bool current = button.raw();
-        if(current && pressed) {
-            if (absolute_time_diff_us(pressed_time, get_absolute_time()) >= 2000000ul) {
-                sleep_ms(500);
-                save_and_disable_interrupts();
-                rosc_hw->ctrl = ROSC_CTRL_ENABLE_VALUE_ENABLE << ROSC_CTRL_ENABLE_LSB;
-                reset_usb_boot(0, 0);
-            }
-        } else if (current) {
-            pressed_time = get_absolute_time();
-            pressed = true;
-        } else {
-            pressed = false;
+    bool current = button.raw();
+    if(current && pressed) {
+        if (absolute_time_diff_us(pressed_time, get_absolute_time()) >= 2000000ul) {
+            sleep_ms(500);
+            save_and_disable_interrupts();
+            rosc_hw->ctrl = ROSC_CTRL_ENABLE_VALUE_ENABLE << ROSC_CTRL_ENABLE_LSB;
+            reset_usb_boot(0, 0);
         }
-#endif
+    } else if (current) {
+        pressed_time = get_absolute_time();
+        pressed = true;
+    } else {
+        pressed = false;
     }
+#endif
+}
 
-    void system_led(uint8_t r, uint8_t g, uint8_t b) {
-        rgbled.set_rgb(r, g, b);
-    }
+void system_led(uint8_t r, uint8_t g, uint8_t b) {
+    rgbled.set_rgb(r, g, b);
 }

src/i2s_audio.c → src/i2s_audio.cpp

@@ -18,8 +18,8 @@ void i2s_audio_init() {
 
     // initialize for 48k we allow changing later
     static audio_format_t audio_format_48k = {
-            .format = AUDIO_BUFFER_FORMAT_PCM_S16,
             .sample_freq = 48000,
+            .format = AUDIO_BUFFER_FORMAT_PCM_S16,
             .channel_count = 2,
     };