Partial fix for speaker pop when a voiceprompt begins

openrtx/src/core/voicePrompts.c

@@ -412,14 +412,16 @@ void vp_terminate()
 void vp_stop()
 {
     voicePromptActive = false;
+    disableSpkOutput();
+    codec_stop();
+
+    // Clear voice prompt sequence data
     vpCurrentSequence.pos          = 0;
     vpCurrentSequence.c2DataIndex  = 0;
     vpCurrentSequence.c2DataLength = 0;
-    codec_stop();
 
     // If any beep is playing, immediately stop it.
     beep_flush();
-    disableSpkOutput();
 }
 
 void vp_flush()
@@ -562,8 +564,8 @@ void vp_play()
 
     voicePromptActive = true;
 
-    enableSpkOutput();
     codec_startDecode(SINK_SPK);
+    enableSpkOutput();
 }
 
 void vp_tick()
@@ -619,11 +621,11 @@ void vp_tick()
     // see if we've finished.
     if(vpCurrentSequence.pos == vpCurrentSequence.length)
     {
+        disableSpkOutput();
         voicePromptActive              = false;
         vpCurrentSequence.pos          = 0;
         vpCurrentSequence.c2DataIndex  = 0;
         vpCurrentSequence.c2DataLength = 0;
-        disableSpkOutput();
         codec_stop();
     }
 }
@@ -657,8 +659,8 @@ void vp_beep(uint16_t freq, uint16_t duration)
     beepSeriesBuffer[1].duration = 0;
     currentBeepDuration = duration;
     beepSeriesIndex     = 0;
-    enableSpkOutput();
     platform_beepStart(freq);
+    enableSpkOutput();
 }
 
 void vp_beepSeries(const uint16_t* beepSeries)

platform/drivers/audio/audio_MDx.c

@@ -51,6 +51,8 @@ void audio_init()
     #endif
     #endif
 
+    gpio_setMode(BEEP_OUT, INPUT);
+
     gpio_setPin(SPK_MUTE);          // Speaker muted
     #ifndef PLATFORM_MD9600
     gpio_clearPin(AUDIO_AMP_EN);    // Audio PA off

platform/drivers/audio/outputStream_MDx.cpp

@@ -178,7 +178,7 @@ streamId outputStream_start(const enum AudioSink destination,
     NVIC_EnableIRQ(DMA1_Stream2_IRQn);
 
     // Enable compare channel
-    TIM3->CCR3 = 0;
+    TIM3->CCR3 = buf[0];
     TIM3->CCER |= TIM_CCER_CC3E;
     TIM3->CR1  |= TIM_CR1_CEN;