Fix PXX1 serial external module

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);