Fix MPM firmware update

radio/src/io/multi_firmware_update.cpp

@@ -128,6 +128,7 @@ class MultiInternalUpdateDriver: public MultiFirmwareUpdateDriver
 };
 #endif
 
+#if defined(HARDWARE_EXTERNAL_MODULE)
 class MultiExternalUpdateDriver: public MultiFirmwareUpdateDriver
 {
   public:
@@ -141,15 +142,7 @@ class MultiExternalUpdateDriver: public MultiFirmwareUpdateDriver
 
     void init(bool inverted) override
     {
-#if !defined(EXTMODULE_USART)
-      GPIO_InitTypeDef GPIO_InitStructure;
-      GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN;
-      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
-      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
-      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
-      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
-      GPIO_Init(EXTMODULE_TX_GPIO, &GPIO_InitStructure);
-#endif
+      extmoduleInitTxPin();
 
       if (inverted)
         telemetryPortInvertedInit(57600);
@@ -164,9 +157,7 @@ class MultiExternalUpdateDriver: public MultiFirmwareUpdateDriver
 
     void sendByte(uint8_t byte) const override
     {
-#if defined(HARDWARE_EXTERNAL_MODULE)
       extmoduleSendInvertedByte(byte);
-#endif
     }
 
     void clear() const override
@@ -184,6 +175,7 @@ class MultiExternalUpdateDriver: public MultiFirmwareUpdateDriver
       clear();
     }
 };
+#endif
 
 class MultiExtSportUpdateDriver: public MultiFirmwareUpdateDriver
 {

radio/src/targets/common/arm/stm32/extmodule_driver.cpp

@@ -144,6 +144,17 @@ void extmoduleSendNextFrameSoftSerial(const void* pulses, uint16_t length, bool
   stm32_pulse_start_dma_req(&extmoduleTimer, pulses, length, LL_TIM_OCMODE_TOGGLE, 0);
 }
 
+void extmoduleInitTxPin()
+{
+  LL_GPIO_InitTypeDef pinInit;
+  LL_GPIO_StructInit(&pinInit);
+  pinInit.Pin = extmoduleTimer.GPIO_Pin;
+  pinInit.Mode = LL_GPIO_MODE_OUTPUT;
+  pinInit.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
+  pinInit.Pull = LL_GPIO_PULL_UP;
+  LL_GPIO_Init(extmoduleTimer.GPIOx, &pinInit);
+}
+
 // Delay based byte sending @ 57600 bps
 void extmoduleSendInvertedByte(uint8_t byte)
 {

radio/src/targets/common/arm/stm32/extmodule_driver.h

@@ -41,4 +41,5 @@ void extmoduleSendNextFrameSoftSerial(const void* pulses, uint16_t length,
                                       bool polarity = true);
 
 // Bitbang serial
+void extmoduleInitTxPin();
 void extmoduleSendInvertedByte(uint8_t byte);

radio/src/targets/simu/module_drivers.cpp

@@ -42,6 +42,7 @@ void extmodulePpmStart(unsigned short, bool) {}
 void extmoduleSerialStart() {}
 void extmodulePxx1SerialStart() {}
 void extmodulePxx1PulsesStart() {}
+void extmoduleInitTxPin() {}
 void extmoduleSendInvertedByte(uint8_t) {}
 void extmoduleSendNextFramePxx1(void const*, unsigned short) {}
 void extmoduleSendNextFrameSoftSerial(void const*, unsigned short, bool) {}