feat(ACCESS): Configure AUX serial port as "External module" (#2562)

* Enable RX DMA on external module USART

* feat(ACCESS): configure AUX serial port as "External module" (#2562)

This allows configuring the external access mod on runtime rather than by compilation option.

* fix: fetch external module driver

radio/src/pulses/afhds3.cpp

@@ -864,7 +864,9 @@ void applyModelConfig(uint8_t module)
 static void* initExternal(uint8_t module)
 {
 #if defined(AFHDS3_EXT_UART)
-  const etx_serial_driver_t* drv = &ExtmoduleSerialDriver;
+  auto drv = extmoduleGetSerialPort();
+  if (!drv) return nullptr;
+
   uint16_t period = AFHDS3_UART_COMMAND_TIMEOUT * 1000 /* us */;
 #else
   const etx_serial_driver_t* drv = nullptr;

radio/src/pulses/pulses.cpp

@@ -207,9 +207,11 @@ uint8_t getModuleType(uint8_t module)
   }
 #endif
 
+#if defined(HARDWARE_EXTERNAL_MODULE)
   if (module == EXTERNAL_MODULE && isExternalModuleAvailable(type)) {
     return type;
   }
+#endif
 
   return MODULE_TYPE_NONE;
 }
@@ -579,7 +581,7 @@ void enablePulsesExternalModule(uint8_t protocol)
       break;
 #endif
 
-#if defined(PXX2) && defined(EXTMODULE_USART)
+#if defined(PXX2)
     case PROTOCOL_CHANNELS_PXX2_HIGHSPEED:
       externalModuleContext = Pxx2ExternalDriver.init(EXTERNAL_MODULE);
       externalModuleDriver = &Pxx2ExternalDriver;

radio/src/pulses/pxx1.cpp

@@ -295,7 +295,10 @@ static const etx_serial_init pxx1ExtSerialInit = {
 
 static void* pxx1InitExternal(uint8_t module)
 {
-  void* uart_ctx = ExtmoduleSerialDriver.init(&pxx1ExtSerialInit);
+  auto drv = extmoduleGetSerialPort();
+  if (!drv) return nullptr;
+
+  void* uart_ctx = drv->init(&pxx1ExtSerialInit);
 
   mixerSchedulerSetPeriod(EXTERNAL_MODULE, EXTMODULE_PXX1_SERIAL_PERIOD);
   EXTERNAL_MODULE_ON();
@@ -307,7 +310,9 @@ static void pxx1DeInitExternal(void* context)
 {
   EXTERNAL_MODULE_OFF();
   mixerSchedulerSetPeriod(EXTERNAL_MODULE, 0);
-  ExtmoduleSerialDriver.deinit(context);
+
+  auto drv = extmoduleGetSerialPort();
+  if (drv) drv->deinit(context);
 }
 
 static void pxx1SetupPulsesExternal(void* context, int16_t* channels, uint8_t nChannels)
@@ -323,8 +328,11 @@ static void pxx1SetupPulsesExternal(void* context, int16_t* channels, uint8_t nC
 
 static void pxx1SendPulsesExternal(void* context)
 {
-  ExtmoduleSerialDriver.sendBuffer(context, extmodulePulsesData.pxx_uart.getData(),
-                                   extmodulePulsesData.pxx_uart.getSize());
+  auto drv = extmoduleGetSerialPort();
+  if (!drv) return;
+
+  drv->sendBuffer(context, extmodulePulsesData.pxx_uart.getData(),
+                  extmodulePulsesData.pxx_uart.getSize());
 }
 
 const etx_module_driver_t Pxx1ExternalSerialDriver = {

radio/src/pulses/pxx2.cpp

@@ -812,6 +812,7 @@ static void pxx2ProcessData(void* context, uint8_t data, uint8_t* buffer, uint8_
 
 
 #include "hal/module_driver.h"
+#include "extmodule_serial_driver.h"
 
 const etx_module_driver_t Pxx2InternalDriver = {
   .protocol = PROTOCOL_CHANNELS_PXX2_HIGHSPEED,
@@ -823,9 +824,6 @@ const etx_module_driver_t Pxx2InternalDriver = {
   .processData = pxx2ProcessData,
 };
 
-#if defined(EXTMODULE_USART)
-#include "extmodule_serial_driver.h"
-
 static void* pxx2InitExternal(uint8_t module, uint32_t baudrate)
 {
   etx_serial_init params(pxx2SerialInitParams);
@@ -837,9 +835,10 @@ static void* pxx2InitExternal(uint8_t module, uint32_t baudrate)
   telemetryProtocol = PROTOCOL_TELEMETRY_FRSKY_SPORT;
 
   auto state = &pxx2State[module];
-  state->init(module, &extmodulePulsesData.pxx2, &ExtmoduleSerialDriver,
-              ExtmoduleSerialDriver.init(&params));
-
+  auto drv = extmoduleGetSerialPort();
+  if (!drv) return nullptr;
+  
+  state->init(module, &extmodulePulsesData.pxx2, drv, drv->init(&params));
   return state;
 }
 
@@ -855,9 +854,11 @@ static void* pxx2InitExtHighSpeed(uint8_t module)
 
 static void pxx2DeInitExternal(void* context)
 {
+  auto state = (PXX2State*)context;
+  if (state) state->deinit();
+
   EXTERNAL_MODULE_OFF();
   mixerSchedulerSetPeriod(EXTERNAL_MODULE, 0);
-  ExtmoduleSerialDriver.deinit(context);
   telemetryProtocol = 0xFF;
 }
 
@@ -897,4 +898,3 @@ const etx_module_driver_t Pxx2LowSpeedExternalDriver = {
   .getByte = pxx2GetByte,
   .processData = pxx2ProcessData,
 };
-#endif