diff --git a/radio/src/targets/common/arm/stm32/extmodule_serial_driver.cpp b/radio/src/targets/common/arm/stm32/extmodule_serial_driver.cpp
index a36d47fb2..50cec65dd 100644
--- a/radio/src/targets/common/arm/stm32/extmodule_serial_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/extmodule_serial_driver.cpp
@@ -19,7 +19,7 @@
  * GNU General Public License for more details.
  */
 
-#include "hal/serial_driver.h"
+#include "extmodule_serial_driver.h"
 #include "board.h"
 
 #if defined(EXTMODULE_USART)
@@ -93,6 +93,16 @@ void extmoduleInvertedSerialStart(uint32_t baudrate)
   extmoduleSerialStart(&params);
 }
 
+#if defined(PXX1)
+void extmodulePxx1SerialStart()
+{
+  EXTERNAL_MODULE_ON();
+  etx_serial_init params(extmoduleSerialParams);
+  params.baudrate = EXTMODULE_PXX1_SERIAL_BAUDRATE;
+  ExtmoduleSerialDriver.init(&params);
+}
+#endif
+
 void extmoduleSerialStop()
 {
   DMA_DeInit(EXTMODULE_USART_TX_DMA_STREAM);
diff --git a/radio/src/targets/common/arm/stm32/extmodule_serial_driver.h b/radio/src/targets/common/arm/stm32/extmodule_serial_driver.h
index 48a887216..b0e6a0492 100644
--- a/radio/src/targets/common/arm/stm32/extmodule_serial_driver.h
+++ b/radio/src/targets/common/arm/stm32/extmodule_serial_driver.h
@@ -33,4 +33,8 @@ void extmoduleFifoError();
 // void extmoduleSendBuffer(const uint8_t * data, uint8_t size);
 // void extmoduleSendNextFrame();
 
+#if defined(PXX1)
+void extmodulePxx1SerialStart();
+#endif
+
 extern etx_serial_driver_t ExtmoduleSerialDriver;
diff --git a/radio/src/targets/taranis/extmodule_driver.cpp b/radio/src/targets/taranis/extmodule_driver.cpp
index de4acc273..5500ec125 100644
--- a/radio/src/targets/taranis/extmodule_driver.cpp
+++ b/radio/src/targets/taranis/extmodule_driver.cpp
@@ -154,14 +154,6 @@ void extmoduleSerialStart()
   NVIC_SetPriority(EXTMODULE_TIMER_CC_IRQn, 7);
 }
 
-
-#if defined(PXX1) && defined(EXTMODULE_USART)
-void extmodulePxx1SerialStart()
-{
-  extmoduleInvertedSerialStart(EXTMODULE_PXX1_SERIAL_BAUDRATE);
-}
-#endif
-
 static void extmoduleSendNextFramePpm(const void* pulses, uint16_t length,
                                       uint16_t trailing_pulse)
 {
diff --git a/radio/src/targets/taranis/hal.h b/radio/src/targets/taranis/hal.h
index 6549c2d4a..66eda1555 100644
--- a/radio/src/targets/taranis/hal.h
+++ b/radio/src/targets/taranis/hal.h
@@ -1544,6 +1544,7 @@
   #define EXTMODULE_USART_IRQHandler            USART6_IRQHandler
   #define EXTMODULE_USART_TX_DMA_CHANNEL        DMA_Channel_5
   #define EXTMODULE_USART_TX_DMA_STREAM         DMA2_Stream6
+  #define EXTMODULE_USART_TX_DMA_FLAG_TC        DMA_FLAG_TCIF6
   #define EXTMODULE_USART_RX_DMA_CHANNEL        DMA_Channel_5
   #define EXTMODULE_USART_RX_DMA_STREAM         DMA2_Stream1
 #else