feat(radio): bluetooth audio KCX mod support for TX16S MK3 (#7056)

radio/src/boards/rm-h750/audio_driver.cpp

@@ -163,7 +163,7 @@ static void audio_update_dma_buffer(uint8_t tc)
 bool audioHeadphoneDetect()
 {
 #if defined(KCX_BTAUDIO)
-  return gpio_read(AUDIO_HP_DETECT_PIN) || gpio_read(BTAUDIO_LINKED_GPIO);
+  return gpio_read(AUDIO_HP_DETECT_PIN) || btAudioLinked();
 #else
   return gpio_read(AUDIO_HP_DETECT_PIN);
 #endif

radio/src/drivers/kcx_btaudio.cpp

@@ -26,6 +26,10 @@
 
 void btAudioInit()
 {
+#if defined(BTAUDIO_POWER_GPIO)
+  gpio_init(BTAUDIO_POWER_GPIO, GPIO_OUT, GPIO_PIN_SPEED_LOW);
+  gpio_set(BTAUDIO_POWER_GPIO);
+#endif
   gpio_init(BTAUDIO_LINKED_GPIO, GPIO_IN, GPIO_PIN_SPEED_LOW);
   gpio_init(BTAUDIO_CONNECT_GPIO, GPIO_OUT, GPIO_PIN_SPEED_LOW);
   gpio_set(BTAUDIO_CONNECT_GPIO);
@@ -33,7 +37,7 @@ void btAudioInit()
 
 bool btAudioLinked()
 {
-  return gpio_read(BTAUDIO_LINKED_GPIO);
+  return gpio_read(BTAUDIO_LINKED_GPIO) != 0;
 }
 
 void btAudioConnect()

radio/src/targets/tx16smk3/CMakeLists.txt

@@ -8,6 +8,7 @@ option(MODULE_SIZE_STD "Standard size TX Module" ON)
 option(LUA_MIXER "Enable LUA mixer/model scripts support" ON)
 option(DISK_CACHE "Enable SD card disk cache" ON)
 option(INTERNAL_GPS "Support for internal GPS" ON)
+option(KCX_BTAUDIO "KCX_BTAUDIO audio emitter installed" OFF)
 
 set(FIRMWARE_QSPI YES)
 set(FIRMWARE_FORMAT_UF2 YES)
@@ -71,8 +72,11 @@ set(SOFTWARE_KEYBOARD ON)
 set(FUNCTION_SWITCHES ON)
 set(USB_CHARGER YES)
 set(AUX_SERIAL YES)
-set(AUX2_SERIAL YES)
-
+if(KCX_BTAUDIO)
+  set(AUX2_SERIAL NO)
+else()
+  set(AUX2_SERIAL YES)
+endif()
 add_definitions(
   -DSTM32H750XBTx -DSTM32H750xx
   -DSDRAM -DCCMRAM
@@ -208,5 +212,12 @@ if (MULTIMODULE)
     )
 endif()
 
+if(KCX_BTAUDIO)
+  set(SRC ${SRC}
+    drivers/kcx_btaudio.cpp
+  )
+  add_definitions(-DKCX_BTAUDIO)
+endif()
+
 # Make malloc() thread-safe
 add_definitions(-DTHREADSAFE_MALLOC)

radio/src/targets/tx16smk3/hal.h

@@ -541,6 +541,7 @@ USART6: INTMODULE_USART
 #define AUX_SERIAL_DMA_RX_CHANNEL           LL_DMAMUX1_REQ_UART5_RX
 #define AUX_SERIAL_PWR_GPIO                 GPIO_PIN(GPIOB, 7) // PB.07
 
+#if defined(AUX2_SERIAL)
 #define AUX2_SERIAL_TX_GPIO                 GPIO_PIN(GPIOB, 10) // PB.10
 #define AUX2_SERIAL_RX_GPIO                 GPIO_PIN(GPIOB, 11) // PB.11
 #define AUX2_SERIAL_USART                   USART3
@@ -553,6 +554,11 @@ USART6: INTMODULE_USART
 #define AUX2_SERIAL_DMA_RX_STREAM           LL_DMA_STREAM_6
 #define AUX2_SERIAL_DMA_RX_CHANNEL          LL_DMAMUX1_REQ_USART3_RX
 #define AUX2_SERIAL_PWR_GPIO                GPIO_PIN(GPIOC, 13) // PC.13
+#elif defined(KCX_BTAUDIO)
+#define BTAUDIO_POWER_GPIO                  GPIO_PIN(GPIOC, 13)
+#define BTAUDIO_LINKED_GPIO                 GPIO_PIN(GPIOB, 11)
+#define BTAUDIO_CONNECT_GPIO                GPIO_PIN(GPIOB, 10)
+#endif
 
 // Touch
 #define TOUCH_I2C_BUS                   I2C_Bus_1