Implement mute button and hold-to-bootloader.

CMakeLists.txt

@@ -19,6 +19,7 @@ pico_sdk_init()
 # Include Pimoroni libraries
 include(drivers/rgbled/rgbled)
 include(drivers/encoder/encoder)
+include(drivers/button/button)
 
 # Add your source files
 add_executable(${NAME})
@@ -42,10 +43,11 @@ add_compile_definitions(${NAME}
         PICO_AUDIO_I2S_MONO_INPUT=0
         PICO_AUDIO_I2S_DATA_PIN=14
         PICO_AUDIO_I2S_CLOCK_PIN_BASE=15
+        DEBUG_BOOTLOADER_SHORTCUT=1
 )
 
 target_link_libraries(${NAME} PUBLIC
-    pico_stdlib pico_audio_i2s pico_unique_id pico_multicore rgbled encoder tinyusb_device tinyusb_board
+    pico_stdlib pico_audio_i2s pico_unique_id pico_multicore rgbled encoder button tinyusb_device tinyusb_board
 )
 
 # create map/bin/hex file etc.

src/board.cpp

@@ -1,12 +1,22 @@
 #include "encoder.hpp"
 #include "rgbled.hpp"
+#include "button.hpp"
 #include "board_config.h"
 
+#include "pico/bootrom.h"
+#include "hardware/structs/rosc.h"
+#include "hardware/watchdog.h"
+#include "hardware/sync.h"
+
 using namespace encoder;
 using namespace pimoroni;
 
 Encoder volume_control(pio1, 0, {ENC_A, ENC_B});
 RGBLED rgbled(LED_R, LED_G, LED_B);
+Button button(BUTTON, pimoroni::ACTIVE_LOW, 0);
+
+bool pressed = false;
+absolute_time_t pressed_time;
 
 extern "C" {
     void system_init() {
@@ -24,6 +34,29 @@ extern "C" {
         return volume_control.delta();
     }
 
+    bool get_mute_button_pressed() {
+        return button.read();
+    }
+
+    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;
+        }
+#endif
+    }
+
     void system_led(uint8_t r, uint8_t g, uint8_t b) {
         rgbled.set_rgb(r, g, b);
     }

src/board.h

@@ -2,4 +2,6 @@
 
 void system_init();
 int32_t get_volume_delta();
-void system_led(uint8_t r, uint8_t g, uint8_t b);
+void system_led(uint8_t r, uint8_t g, uint8_t b);
+bool get_mute_button_pressed();
+void handle_mute_button_held();

src/main.c

@@ -433,6 +433,14 @@ void audio_task(void)
   if (board_millis() - start_ms >= volume_interval_ms)
   {
     int32_t volume_delta = get_volume_delta();
+
+    // Long press triggers reset to bootloader
+    handle_mute_button_held();
+
+    if(get_mute_button_pressed()) {
+      mute[0] = !mute[0];
+      mute[1] = !mute[1];
+    }
     /*if(volume_delta > 0) {
       system_led(0, 255, 0);
     } else if (volume_delta < 0) {