feat(tx15): support for KCX BT audio (#6777)

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

@@ -1,3 +1,24 @@
+/*
+* Copyright (C) EdgeTX
+ *
+ * Based on code named
+ *   opentx - https://github.com/opentx/opentx
+ *   th9x - http://code.google.com/p/th9x
+ *   er9x - http://code.google.com/p/er9x
+ *   gruvin9x - http://code.google.com/p/gruvin9x
+ *
+ * License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
 #include "drivers/tas2505.h"
 
 #include "stm32_dma.h"
@@ -141,11 +162,20 @@ 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);
+#else
   return gpio_read(AUDIO_HP_DETECT_PIN);
+#endif
 }
 
 void audioSetVolume(uint8_t volume)
 {
+#if defined(KCX_BTAUDIO)
+  // KCX need a volume boost
+  if (btAudioLinked())
+    volume = volume + (volume	>> 2);
+#endif
   tas2505_set_volume(&_tas2505, volume * 9 / 10, audioHeadphoneDetect()); // TX15 HP cannot handle the full power of TAS2505
 }
 

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

@@ -135,6 +135,10 @@ void boardInit()
   // enable interrupts
   __enable_irq();
 
+#if defined(KCX_BTAUDIO)
+  btAudioInit();
+#endif
+
   ledInit();
   boardInitModulePorts();