diff --git a/radio/src/audio_arm.cpp b/radio/src/audio.cpp
similarity index 100%
rename from radio/src/audio_arm.cpp
rename to radio/src/audio.cpp
diff --git a/radio/src/audio_arm.h b/radio/src/audio.h
similarity index 100%
rename from radio/src/audio_arm.h
rename to radio/src/audio.h
diff --git a/radio/src/cli.h b/radio/src/cli.h
index fdb96d6d1..a590e101c 100644
--- a/radio/src/cli.h
+++ b/radio/src/cli.h
@@ -28,7 +28,7 @@ extern uint8_t cliTracesEnabled;
 #ifdef __cplusplus
 #include "fifo.h"
 extern Fifo<uint8_t, 256> cliRxFifo;
-#include "tasks_arm.h"
+#include "tasks.h"
 extern RTOS_TASK_HANDLE cliTaskId;
 extern RTOS_DEFINE_STACK(cliStack, CLI_STACK_SIZE);
 #endif
diff --git a/radio/src/main_arm.cpp b/radio/src/main.cpp
similarity index 100%
rename from radio/src/main_arm.cpp
rename to radio/src/main.cpp
diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index ec716ea5f..feb604939 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -1907,7 +1907,6 @@ void opentxInit(OPENTX_INIT_ARGS)
   init_trainer_capture();
 #endif
 
-
   startPulses();
 
   wdt_enable(WDTO_500MS);
diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index add26a283..e2d79bc14 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -657,7 +657,7 @@ uint16_t isqrt32(uint32_t n);
 #define pauseMixerCalculations()
 #define resumeMixerCalculations()
 #else
-#include "tasks_arm.h"
+#include "tasks.h"
 extern RTOS_MUTEX_HANDLE mixerMutex;
 inline void pauseMixerCalculations()
 {
@@ -1040,7 +1040,7 @@ enum AUDIO_SOUNDS {
 };
 
 #if defined(AUDIO)
-#include "audio_arm.h"
+#include "audio.h"
 #endif
 
 #include "buzzer.h"
diff --git a/radio/src/pulses/pulses_arm.cpp b/radio/src/pulses/pulses_arm.cpp
index 290369e3a..83963ed86 100755
--- a/radio/src/pulses/pulses_arm.cpp
+++ b/radio/src/pulses/pulses_arm.cpp
@@ -48,7 +48,7 @@ uint8_t getRequiredProtocol(uint8_t port)
           break;
 #endif
         case MODULE_TYPE_XJT:
-          required_protocol = PROTOCOL_CHANNELS_PXX;
+          required_protocol = PROTOCOL_CHANNELS_PXX2;
           break;
         default:
           required_protocol = PROTOCOL_CHANNELS_NONE;
@@ -139,58 +139,118 @@ void setupPulsesPXX(uint8_t port)
 #endif
 }
 
-void setupPulses(uint8_t port)
+void setupPulsesPXX2(uint8_t module)
 {
-  bool init_needed = false;
-  uint8_t required_protocol = getRequiredProtocol(port);
+  if (module == INTERNAL_MODULE) {
+    modulePulsesData[module].pxx2.setupFrame(module);
+    intmoduleSendNextFrame();
+  }
 
-  heartbeat |= (HEART_TIMER_PULSES << port);
+#if 0
+  // here we have to wait that telemetryInit() is called, hence this test
+  if (telemetryProtocol == PROTOCOL_TELEMETRY_PXX2) {
+    modulePulsesData[port].pxx2.setupFrame(port);
+    sportSendBuffer(modulePulsesData[port].pxx2.getData(), modulePulsesData[port].pxx2.getSize());
+  }
+#endif
+}
 
-  if (s_current_protocol[port] != required_protocol) {
-    init_needed = true;
-    switch (s_current_protocol[port]) { // stop existing protocol hardware
-      case PROTOCOL_CHANNELS_PXX:
-        disable_pxx(port);
-        break;
+void disablePulses(uint8_t port, uint8_t protocol)
+{
+  // stop existing protocol hardware
+
+  switch (protocol) {
+    case PROTOCOL_CHANNELS_PXX:
+      disable_pxx(port);
+      break;
 
 #if defined(DSM2)
-      case PROTOCOL_CHANNELS_DSM2_LP45:
-      case PROTOCOL_CHANNELS_DSM2_DSM2:
-      case PROTOCOL_CHANNELS_DSM2_DSMX:
-        disable_serial(port);
-        break;
+    case PROTOCOL_CHANNELS_DSM2_LP45:
+    case PROTOCOL_CHANNELS_DSM2_DSM2:
+    case PROTOCOL_CHANNELS_DSM2_DSMX:
+      disable_serial(port);
+      break;
 #endif
 
 #if defined(CROSSFIRE)
-      case PROTOCOL_CHANNELS_CROSSFIRE:
-        disable_module_timer(port);
-        break;
+    case PROTOCOL_CHANNELS_CROSSFIRE:
+      disable_module_timer(port);
+      break;
 #endif
 
-      case PROTOCOL_CHANNELS_PXX2:
-        disable_module_timer(port);
-        break;
+    case PROTOCOL_CHANNELS_PXX2:
+      disable_pxx2(port);
+      break;
 
 #if defined(MULTIMODULE)
       case PROTOCOL_CHANNELS_MULTIMODULE:
 #endif
-      case PROTOCOL_CHANNELS_SBUS:
-        disable_serial(port);
-        break;
+    case PROTOCOL_CHANNELS_SBUS:
+      disable_serial(port);
+      break;
 
-      case PROTOCOL_CHANNELS_PPM:
-        disable_ppm(port);
-        break;
+    case PROTOCOL_CHANNELS_PPM:
+      disable_ppm(port);
+      break;
 
-      default:
-        disable_no_pulses(port);
-        break;
-    }
-    s_current_protocol[port] = required_protocol;
+    default:
+      disable_no_pulses(port);
+      break;
   }
+}
 
-  // Set up output data here
-  switch (required_protocol) {
+void enablePulses(uint8_t port, uint8_t protocol)
+{
+  // start new protocol hardware here
+
+  #warning "CHECK THAT ALL PROTOCOL INIT WON'T SEND A FIRST WRONG FRAME HERE"
+
+  switch (protocol) {
+    case PROTOCOL_CHANNELS_PXX:
+      init_pxx(port);
+      break;
+
+#if defined(DSM2)
+    case PROTOCOL_CHANNELS_DSM2_LP45:
+    case PROTOCOL_CHANNELS_DSM2_DSM2:
+    case PROTOCOL_CHANNELS_DSM2_DSMX:
+      init_serial(port, DSM2_BAUDRATE, DSM2_PERIOD * 2000);
+      break;
+#endif
+
+#if defined(CROSSFIRE)
+    case PROTOCOL_CHANNELS_CROSSFIRE:
+      init_module_timer(port, CROSSFIRE_PERIOD, true);
+      break;
+#endif
+
+    case PROTOCOL_CHANNELS_PXX2:
+      init_pxx2(port);
+      break;
+
+#if defined(MULTIMODULE)
+    case PROTOCOL_CHANNELS_MULTIMODULE:
+      init_serial(port, MULTIMODULE_BAUDRATE, MULTIMODULE_PERIOD * 2000);
+      break;
+#endif
+
+    case PROTOCOL_CHANNELS_SBUS:
+      init_serial(port, SBUS_BAUDRATE, SBUS_PERIOD_HALF_US);
+      break;
+
+    case PROTOCOL_CHANNELS_PPM:
+      init_ppm(port);
+      break;
+
+    default:
+      init_no_pulses(port);
+      break;
+  }
+}
+
+void sendPulses(uint8_t port, uint8_t protocol)
+{
+  switch (protocol) {
     case PROTOCOL_CHANNELS_PXX:
       setupPulsesPXX(port);
       scheduleNextMixerCalculation(port, PXX_PERIOD);
@@ -212,7 +272,7 @@ void setupPulses(uint8_t port)
 
 #if defined(CROSSFIRE)
     case PROTOCOL_CHANNELS_CROSSFIRE:
-      if (telemetryProtocol == PROTOCOL_TELEMETRY_CROSSFIRE && !init_needed) {
+      if (telemetryProtocol == PROTOCOL_TELEMETRY_CROSSFIRE) {
         uint8_t * crossfire = modulePulsesData[port].crossfire.pulses;
         uint8_t len;
 #if defined(LUA)
@@ -234,11 +294,7 @@ void setupPulses(uint8_t port)
 #endif
 
     case PROTOCOL_CHANNELS_PXX2:
-      // here we have to wait that telemetryInit() is called, hence this test
-      if (telemetryProtocol == PROTOCOL_TELEMETRY_PXX2 && !init_needed) {
-        modulePulsesData[port].pxx2.setupFrame(port);
-        sportSendBuffer(modulePulsesData[port].pxx2.getData(), modulePulsesData[port].pxx2.getSize());
-      }
+      setupPulsesPXX2(port);
       scheduleNextMixerCalculation(port, PXX2_PERIOD);
       break;
 
@@ -251,7 +307,7 @@ void setupPulses(uint8_t port)
 
     case PROTOCOL_CHANNELS_PPM:
 #if defined(PCBSKY9X)
-    case PROTOCOL_CHANNELS_NONE:
+      case PROTOCOL_CHANNELS_NONE:
 #endif
       setupPulsesPPMModule(port);
       scheduleNextMixerCalculation(port, PPM_PERIOD(port));
@@ -260,49 +316,21 @@ void setupPulses(uint8_t port)
     default:
       break;
   }
+}
 
-  if (init_needed) {
-    switch (required_protocol) { // Start new protocol hardware here
-      case PROTOCOL_CHANNELS_PXX:
-        init_pxx(port);
-        break;
+void setupPulses(uint8_t module)
+{
+  uint8_t required_protocol = getRequiredProtocol(module);
 
-#if defined(DSM2)
-      case PROTOCOL_CHANNELS_DSM2_LP45:
-      case PROTOCOL_CHANNELS_DSM2_DSM2:
-      case PROTOCOL_CHANNELS_DSM2_DSMX:
-        init_serial(port, DSM2_BAUDRATE, DSM2_PERIOD * 2000);
-        break;
-#endif
+  heartbeat |= (HEART_TIMER_PULSES << module);
 
-#if defined(CROSSFIRE)
-      case PROTOCOL_CHANNELS_CROSSFIRE:
-        init_module_timer(port, CROSSFIRE_PERIOD, true);
-        break;
-#endif
-
-      case PROTOCOL_CHANNELS_PXX2:
-        init_module_timer(port, PXX2_PERIOD, true);
-        break;
-
-#if defined(MULTIMODULE)
-      case PROTOCOL_CHANNELS_MULTIMODULE:
-        init_serial(port, MULTIMODULE_BAUDRATE, MULTIMODULE_PERIOD * 2000);
-        break;
-#endif
-
-      case PROTOCOL_CHANNELS_SBUS:
-        init_serial(port, SBUS_BAUDRATE, SBUS_PERIOD_HALF_US);
-        break;
-
-      case PROTOCOL_CHANNELS_PPM:
-        init_ppm(port);
-        break;
-
-      default:
-        init_no_pulses(port);
-        break;
-    }
+  if (s_current_protocol[module] != required_protocol) {
+    disablePulses(module, s_current_protocol[module]);
+    s_current_protocol[module] = required_protocol;
+    enablePulses(module, required_protocol);
+  }
+  else {
+    sendPulses(module, required_protocol);
   }
 }
 
diff --git a/radio/src/targets/common/arm/CMakeLists.txt b/radio/src/targets/common/arm/CMakeLists.txt
index 3acf9aaa1..3e1b89fb6 100644
--- a/radio/src/targets/common/arm/CMakeLists.txt
+++ b/radio/src/targets/common/arm/CMakeLists.txt
@@ -88,9 +88,9 @@ foreach(LANGUAGE ${TTS_LANGUAGES})
 endforeach()
 set(SRC
   ${SRC}
-  main_arm.cpp
-  tasks_arm.cpp
-  audio_arm.cpp
+  main.cpp
+  tasks.cpp
+  audio.cpp
   io/frsky_sport.cpp
   telemetry/telemetry.cpp
   telemetry/telemetry_holders.cpp
diff --git a/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp b/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
index b372d8744..a91b944f6 100755
--- a/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/intmodule_serial_driver.cpp
@@ -23,40 +23,20 @@
 void intmoduleStop()
 {
   INTERNAL_MODULE_OFF();
-
-  NVIC_DisableIRQ(INTMODULE_TIMER_IRQn);
-
   INTMODULE_DMA_STREAM->CR &= ~DMA_SxCR_EN; // Disable DMA
-  INTMODULE_TIMER->DIER &= ~TIM_DIER_CC2IE;
-  INTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
-}
-
-void intmoduleNoneStart()
-{
-  INTERNAL_MODULE_OFF();
-
-  GPIO_InitTypeDef GPIO_InitStructure;
-  GPIO_InitStructure.GPIO_Pin = INTMODULE_TX_GPIO_PIN;
-  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
-  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
-  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
-  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
-  GPIO_Init(INTMODULE_TX_GPIO, &GPIO_InitStructure);
-  GPIO_SetBits(INTMODULE_TX_GPIO, INTMODULE_TX_GPIO_PIN); // Set high
-
-  INTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
-  INTMODULE_TIMER->PSC = INTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS (2Mhz)
-  INTMODULE_TIMER->ARR = 36000; // 18mS
-  INTMODULE_TIMER->CCR2 = 32000; // Update time
-  INTMODULE_TIMER->EGR = 1; // Restart
-  INTMODULE_TIMER->SR &= ~TIM_SR_CC2IF; // Clear flag
-  INTMODULE_TIMER->DIER |= TIM_DIER_CC2IE; // Enable this interrupt
-  INTMODULE_TIMER->CR1 |= TIM_CR1_CEN;
-  NVIC_EnableIRQ(INTMODULE_TIMER_IRQn);
-  NVIC_SetPriority(INTMODULE_TIMER_IRQn, 7);
 }
 
 void intmodulePxxStart()
+{
+  // shouldn't be used anymore
+}
+
+void intmoduleTimerStart(uint32_t period, uint8_t state)
+{
+  // shouldn't be used anymore
+}
+
+void intmodulePxx2Start()
 {
   INTERNAL_MODULE_ON();
 
@@ -94,23 +74,6 @@ void intmodulePxxStart()
   USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
   USART_Init(INTMODULE_USART, &USART_InitStructure);
   USART_Cmd(INTMODULE_USART, ENABLE);
-
-  // Timer
-  INTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
-  INTMODULE_TIMER->PSC = INTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS (2Mhz)
-  INTMODULE_TIMER->ARR = PXX_PERIOD_HALF_US;
-  INTMODULE_TIMER->CCR2 = PXX_PERIOD_HALF_US - 2000; // Update time
-  INTMODULE_TIMER->CCER = TIM_CCER_CC3E;
-  INTMODULE_TIMER->CCMR2 = 0;
-  INTMODULE_TIMER->EGR = 1; // Restart
-
-  INTMODULE_TIMER->CCMR2 = TIM_CCMR2_OC3M_1 | TIM_CCMR2_OC3M_0; // Toggle CC1 o/p
-  INTMODULE_TIMER->SR &= ~TIM_SR_CC2IF; // Clear flag
-  INTMODULE_TIMER->DIER |= TIM_DIER_CC2IE;  // Enable this interrupt
-  INTMODULE_TIMER->CR1 |= TIM_CR1_CEN;
-
-  NVIC_EnableIRQ(INTMODULE_TIMER_IRQn);
-  NVIC_SetPriority(INTMODULE_TIMER_IRQn, 7);
 }
 
 extern "C" void INTMODULE_DMA_STREAM_IRQHandler(void)
@@ -124,14 +87,14 @@ extern "C" void INTMODULE_DMA_STREAM_IRQHandler(void)
 
 void intmoduleSendNextFrame()
 {
-  if (s_current_protocol[INTERNAL_MODULE] == PROTOCOL_CHANNELS_PXX) {
+  if (s_current_protocol[INTERNAL_MODULE] == PROTOCOL_CHANNELS_PXX2) {
     DMA_InitTypeDef DMA_InitStructure;
     DMA_DeInit(INTMODULE_DMA_STREAM);
     DMA_InitStructure.DMA_Channel = INTMODULE_DMA_CHANNEL;
     DMA_InitStructure.DMA_PeripheralBaseAddr = CONVERT_PTR_UINT(&INTMODULE_USART->DR);
     DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
-    DMA_InitStructure.DMA_Memory0BaseAddr = CONVERT_PTR_UINT(modulePulsesData[INTERNAL_MODULE].pxx_uart.getData());
-    DMA_InitStructure.DMA_BufferSize = modulePulsesData[INTERNAL_MODULE].pxx_uart.getSize();
+    DMA_InitStructure.DMA_Memory0BaseAddr = CONVERT_PTR_UINT(modulePulsesData[INTERNAL_MODULE].pxx2.getData());
+    DMA_InitStructure.DMA_BufferSize = modulePulsesData[INTERNAL_MODULE].pxx2.getSize();
     DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
     DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
     DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
@@ -143,21 +106,7 @@ void intmoduleSendNextFrame()
     DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
     DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
     DMA_Init(INTMODULE_DMA_STREAM, &DMA_InitStructure);
-
     DMA_Cmd(INTMODULE_DMA_STREAM, ENABLE);
     USART_DMACmd(INTMODULE_USART, USART_DMAReq_Tx, ENABLE);
   }
 }
-
-extern "C" void INTMODULE_TIMER_IRQHandler()
-{
-  DEBUG_INTERRUPT(INT_TIM1CC);
-  DEBUG_TIMER_SAMPLE(debugTimerIntPulses);
-  DEBUG_TIMER_START(debugTimerIntPulsesDuration);
-
-  INTMODULE_TIMER->SR &= ~TIM_SR_CC2IF;           // clear flag
-  setupPulses(INTERNAL_MODULE);
-  intmoduleSendNextFrame();
-  
-  DEBUG_TIMER_STOP(debugTimerIntPulsesDuration);
-}
diff --git a/radio/src/targets/horus/extmodule_driver.cpp b/radio/src/targets/horus/extmodule_driver.cpp
index be1248b54..e8e71ae76 100644
--- a/radio/src/targets/horus/extmodule_driver.cpp
+++ b/radio/src/targets/horus/extmodule_driver.cpp
@@ -65,7 +65,6 @@ void extmoduleTimerStart(uint32_t period, uint8_t state)
   NVIC_SetPriority(EXTMODULE_TIMER_IRQn, 7);
 }
 
-
 void extmodulePpmStart()
 {
   EXTERNAL_MODULE_ON();
@@ -165,6 +164,11 @@ void extmodulePxxStart()
   NVIC_SetPriority(EXTMODULE_TIMER_IRQn, 7);
 }
 
+void extmodulePxx2Start()
+{
+  // TODO just enable the S.PORT line (or let telemetry init do it)
+}
+
 #if defined(DSM2)
 void extmoduleSerialStart(uint32_t /*baudrate*/, uint32_t period_half_us)
 {
diff --git a/radio/src/targets/horus/pulses_driver.cpp b/radio/src/targets/horus/pulses_driver.cpp
index 97305df0b..16009415c 100644
--- a/radio/src/targets/horus/pulses_driver.cpp
+++ b/radio/src/targets/horus/pulses_driver.cpp
@@ -20,23 +20,20 @@
 
 #include "opentx.h"
 
-void intmoduleStop(void);
-void extmoduleStop(void);
-
-void intmoduleNoneStart(void);
-void intmodulePxxStart(void);
+void intmoduleStop();
+void intmoduleTimerStart(uint32_t period, uint8_t state);
+void intmodulePxxStart();
 
+void extmoduleStop();
 void extmoduleTimerStart(uint32_t period, uint8_t state);
-void extmodulePpmStart(void);
-void extmodulePxxStart(void);
+void extmodulePpmStart();
+void extmodulePxxStart();
+void extmodulePxx2Start();
 void extmoduleSerialStart(uint32_t baudrate, uint32_t period_half_us);
 
 void init_no_pulses(uint32_t port)
 {
-  if (port == INTERNAL_MODULE)
-    intmoduleNoneStart();
-  else
-    extmoduleTimerStart(18, false);
+  init_module_timer(port, 18, false);
 }
 
 void disable_no_pulses(uint32_t port)
@@ -61,6 +58,14 @@ void disable_ppm(uint32_t port)
   }
 }
 
+void init_pxx2(uint32_t port)
+{
+  if (port == INTERNAL_MODULE)
+    intmodulePxx2Start();
+  else
+    extmodulePxx2Start();
+}
+
 void init_pxx(uint32_t port)
 {
   if (port == INTERNAL_MODULE)
@@ -95,15 +100,17 @@ void disable_serial(uint32_t port)
 
 void init_module_timer(uint32_t port, uint32_t period, uint8_t state)
 {
-  if (port == EXTERNAL_MODULE) {
+  if (port == INTERNAL_MODULE)
+    intmoduleTimerStart(period, state);
+  else
     extmoduleTimerStart(period, state);
-  }
 }
 
 void disable_module_timer(uint32_t port)
 {
-  if (port == EXTERNAL_MODULE) {
+  if (port == INTERNAL_MODULE)
+    intmoduleStop();
+  else
     extmoduleStop();
-  }
 }
 
diff --git a/radio/src/targets/taranis/CMakeLists.txt b/radio/src/targets/taranis/CMakeLists.txt
index 262c4ee5a..10c8405c0 100644
--- a/radio/src/targets/taranis/CMakeLists.txt
+++ b/radio/src/targets/taranis/CMakeLists.txt
@@ -119,6 +119,7 @@ elseif(PCB STREQUAL XLITES)
 endif()
 
 if(PCB STREQUAL XLITE OR PCB STREQUAL XLITES)
+  add_definitions(-DINTERNAL_MODULE_SERIAL)
   if(PXX_FREQUENCY STREQUAL HIGH)
     add_definitions(-DPXX_FREQUENCY_HIGH)
   endif()
diff --git a/radio/src/targets/taranis/board.h b/radio/src/targets/taranis/board.h
index d451cd5ad..89905bd43 100644
--- a/radio/src/targets/taranis/board.h
+++ b/radio/src/targets/taranis/board.h
@@ -180,16 +180,19 @@ uint32_t isBootloaderStart(const uint8_t * buffer);
 #else
   #define IS_UART_MODULE(port)          (false)
 #endif
-void init_no_pulses(uint32_t port);
-void disable_no_pulses(uint32_t port);
-void init_ppm( uint32_t module_index);
-void disable_ppm( uint32_t module_index);
-void init_pxx( uint32_t module_index);
-void disable_pxx( uint32_t module_index);
-void init_serial( uint32_t module_index, uint32_t baudrate, uint32_t period);
-void disable_serial( uint32_t module_index);
-void init_module_timer( uint32_t module_index, uint32_t period, uint8_t state);
-void disable_module_timer( uint32_t module_index);
+void init_no_pulses(uint8_t module);
+void disable_no_pulses(uint8_t module);
+void init_ppm(uint8_t module);
+void disable_ppm(uint8_t module);
+void intmoduleSendNextFrame();
+void init_pxx2(uint8_t module);
+void disable_pxx2(uint8_t module);
+void init_pxx(uint8_t module);
+void disable_pxx(uint8_t module);
+void init_serial(uint8_t module, uint32_t baudrate, uint32_t period);
+void disable_serial(uint8_t module);
+void init_module_timer(uint8_t module, uint32_t period, uint8_t state);
+void disable_module_timer(uint8_t module);
 
 // Trainer driver
 #define SLAVE_MODE()                    (g_model.trainerData.mode == TRAINER_MODE_SLAVE)
diff --git a/radio/src/targets/taranis/extmodule_driver.cpp b/radio/src/targets/taranis/extmodule_driver.cpp
index b092499b9..109275c6f 100644
--- a/radio/src/targets/taranis/extmodule_driver.cpp
+++ b/radio/src/targets/taranis/extmodule_driver.cpp
@@ -200,6 +200,11 @@ void extmodulePxxStart()
 {
   extmoduleInvertedSerialStart(EXTMODULE_USART_PXX_BAUDRATE, PXX_PERIOD_HALF_US);
 }
+
+void extmodulePxx2Start()
+{
+  extmoduleInvertedSerialStart(EXTMODULE_USART_PXX_BAUDRATE, PXX_PERIOD_HALF_US);
+}
 #else
 void extmodulePxxStart()
 {
@@ -234,6 +239,11 @@ void extmodulePxxStart()
   NVIC_EnableIRQ(EXTMODULE_TIMER_CC_IRQn);
   NVIC_SetPriority(EXTMODULE_TIMER_CC_IRQn, 7);
 }
+
+void extmodulePxx2Start()
+{
+  // TODO just enable the S.PORT line (or let telemetry init do it)
+}
 #endif
 
 void extmoduleSendNextFrame()
diff --git a/radio/src/targets/taranis/intmodule_pulses_driver.cpp b/radio/src/targets/taranis/intmodule_pulses_driver.cpp
index 10ef3303c..5058f3b74 100644
--- a/radio/src/targets/taranis/intmodule_pulses_driver.cpp
+++ b/radio/src/targets/taranis/intmodule_pulses_driver.cpp
@@ -32,9 +32,14 @@ void intmoduleStop()
   INTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
 }
 
-void intmoduleNoneStart()
+void intmoduleTimerStart(uint32_t period, uint8_t state)
 {
-  INTERNAL_MODULE_OFF();
+  if (state)
+    INTERNAL_MODULE_ON();
+  else
+    INTERNAL_MODULE_OFF();
+
+  GPIO_PinAFConfig(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PinSource, 0);
 
   GPIO_InitTypeDef GPIO_InitStructure;
   GPIO_InitStructure.GPIO_Pin = INTMODULE_TX_GPIO_PIN;
@@ -46,9 +51,9 @@ void intmoduleNoneStart()
   GPIO_SetBits(INTMODULE_TX_GPIO, INTMODULE_TX_GPIO_PIN); // Set high
 
   INTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
-  INTMODULE_TIMER->PSC = INTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS from 30MHz
-  INTMODULE_TIMER->ARR = 36000; // 18mS
-  INTMODULE_TIMER->CCR2 = 32000; // Update time
+  INTMODULE_TIMER->PSC = EXTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS from 30MHz
+  INTMODULE_TIMER->ARR = (2000 * period);
+  INTMODULE_TIMER->CCR2 = (2000 * period) - 1000;
   INTMODULE_TIMER->EGR = 1; // Restart
   INTMODULE_TIMER->SR &= ~TIM_SR_CC2IF; // Clear flag
   INTMODULE_TIMER->DIER |= TIM_DIER_CC2IE; // Enable this interrupt
diff --git a/radio/src/targets/taranis/pulses_driver.cpp b/radio/src/targets/taranis/pulses_driver.cpp
index 9b7cfea4d..6e5070222 100644
--- a/radio/src/targets/taranis/pulses_driver.cpp
+++ b/radio/src/targets/taranis/pulses_driver.cpp
@@ -20,103 +20,118 @@
 
 #include "opentx.h"
 
-void intmoduleStop(void);
-void extmoduleStop(void);
-
-void intmoduleNoneStart(void);
-void intmodulePxxStart(void);
+void intmoduleStop();
+void intmoduleTimerStart(uint32_t period, uint8_t state);
+void intmodulePxxStart();
+void intmodulePxx2Start();
 #if defined(TARANIS_INTERNAL_PPM)
 void intmodulePpmStart(void);
 #endif
 
+void extmoduleStop();
 void extmoduleTimerStart(uint32_t period, uint8_t state);
-void extmodulePpmStart(void);
-void extmodulePxxStart(void);
+void extmodulePpmStart();
+void extmodulePxxStart();
+void extmodulePxx2Start();
 void extmoduleSerialStart(uint32_t baudrate, uint32_t period_half_us);
 
-
-void init_pxx(uint32_t port)
+void init_pxx(uint8_t module)
 {
-  if (port == INTERNAL_MODULE)
+  if (module == INTERNAL_MODULE)
     intmodulePxxStart();
   else
     extmodulePxxStart();
 }
 
-void disable_pxx(uint32_t port)
+void disable_pxx(uint8_t module)
 {
-  if (port == INTERNAL_MODULE)
+  if (module == INTERNAL_MODULE)
+    intmoduleStop();
+  else
+    extmoduleStop();
+}
+
+void init_pxx2(uint8_t module)
+{
+  if (module == INTERNAL_MODULE)
+    intmodulePxx2Start();
+  else
+    extmodulePxx2Start();
+}
+
+void disable_pxx2(uint8_t module)
+{
+  if (module == INTERNAL_MODULE)
     intmoduleStop();
   else
     extmoduleStop();
 }
 
 #if defined(DSM2)
-void init_serial(uint32_t port, uint32_t baudrate, uint32_t period_half_us)
+void init_serial(uint8_t module, uint32_t baudrate, uint32_t period_half_us)
 {
-  if (port == EXTERNAL_MODULE) {
+  if (module == EXTERNAL_MODULE) {
     extmoduleSerialStart(baudrate, period_half_us);
   }
 }
 
-void disable_serial(uint32_t port)
+void disable_serial(uint8_t module)
 {
-  if (port == EXTERNAL_MODULE) {
+  if (module == EXTERNAL_MODULE) {
     extmoduleStop();
   }
 }
 #endif
 
-void init_ppm(uint32_t port)
+void init_ppm(uint8_t module)
 {
-  if (port == EXTERNAL_MODULE) {
+  if (module == EXTERNAL_MODULE) {
     extmodulePpmStart();
   }
 #if defined(TARANIS_INTERNAL_PPM)
-  else if (port == INTERNAL_MODULE) {
+  else {
     intmodulePpmStart();
   }
 #endif
 }
 
-void disable_ppm(uint32_t port)
+void disable_ppm(uint8_t module)
 {
-  if (port == EXTERNAL_MODULE) {
+  if (module == EXTERNAL_MODULE) {
     extmoduleStop();
   }
 #if defined(TARANIS_INTERNAL_PPM)
-  else if (port == INTERNAL_MODULE) {
+  else {
     intmoduleStop();
   }
 #endif
 }
 
-void init_no_pulses(uint32_t port)
+void init_no_pulses(uint8_t module)
 {
-  if (port == INTERNAL_MODULE)
-    intmoduleNoneStart();
-  else
-    extmoduleTimerStart(18, false);
+  init_module_timer(module, 18, false);
 }
 
-void disable_no_pulses(uint32_t port)
+void disable_no_pulses(uint8_t module)
 {
-  if (port == INTERNAL_MODULE)
+  if (module == INTERNAL_MODULE)
     intmoduleStop();
   else
     extmoduleStop();
 }
 
-void init_module_timer(uint32_t port, uint32_t period, uint8_t state)
+void init_module_timer(uint8_t module, uint32_t period, uint8_t state)
 {
-  if (port == EXTERNAL_MODULE) {
+  if (module == INTERNAL_MODULE)
+    intmoduleTimerStart(period, state);
+  else
     extmoduleTimerStart(period, state);
-  }
 }
 
-void disable_module_timer(uint32_t port)
+void disable_module_timer(uint8_t module)
 {
-  if (port == EXTERNAL_MODULE) {
+  if (module == INTERNAL_MODULE)
+    intmoduleStop();
+  else
     extmoduleStop();
-  }
 }
diff --git a/radio/src/tasks_arm.cpp b/radio/src/tasks.cpp
similarity index 91%
rename from radio/src/tasks_arm.cpp
rename to radio/src/tasks.cpp
index 129684a4d..41901446d 100644
--- a/radio/src/tasks_arm.cpp
+++ b/radio/src/tasks.cpp
@@ -73,6 +73,21 @@ bool isForcePowerOffRequested()
   return false;
 }
 
+bool isProtocolSynchronous(uint8_t protocol)
+{
+  return (protocol == PROTOCOL_CHANNELS_PXX2 || protocol == PROTOCOL_CHANNELS_NONE);
+}
+
+void sendSynchronousPulses()
+{
+  for (uint8_t module = 0; module < NUM_MODULES; module++) {
+    uint8_t protocol = s_current_protocol[module];
+    if (isProtocolSynchronous(protocol)) {
+      setupPulses(module);
+    }
+  }
+}
+
 uint32_t nextMixerTime[NUM_MODULES];
 
 TASK_FUNCTION(mixerTask)
@@ -89,8 +104,9 @@ TASK_FUNCTION(mixerTask)
     RTOS_WAIT_TICKS(1);
 
 #if defined(SIMU)
-    if (pwrCheck() == e_power_off)
+    if (pwrCheck() == e_power_off) {
       TASK_RETURN();
+    }
 #else
     if (isForcePowerOffRequested()) {
       pwrOff();
@@ -153,7 +169,9 @@ TASK_FUNCTION(mixerTask)
       }
 
       t0 = getTmr2MHz() - t0;
-      if (t0 > maxMixerDuration) maxMixerDuration = t0 ;
+      if (t0 > maxMixerDuration) maxMixerDuration = t0;
+
+      sendSynchronousPulses();
     }
   }
 }
diff --git a/radio/src/tasks_arm.h b/radio/src/tasks.h
similarity index 100%
rename from radio/src/tasks_arm.h
rename to radio/src/tasks.h
diff --git a/radio/src/trainer_input.cpp b/radio/src/trainer_input.cpp
index 838c78297..a84ed0d6e 100644
--- a/radio/src/trainer_input.cpp
+++ b/radio/src/trainer_input.cpp
@@ -24,7 +24,7 @@ int16_t ppmInput[MAX_TRAINER_CHANNELS];
 uint8_t ppmInputValidityTimer;
 
 
-#include "audio_arm.h"
+#include "audio.h"
 
 void checkTrainerSignalWarning()
 {