[UART] Allow to enable HAL module only

Define `HAL_UART_MODULE_ONLY` in `build_opt.h` or `hal_conf_extra.h`
allow HAL UART module usage without any usage by the core.

Fixes #697

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/HardwareSerial.cpp

@@ -26,7 +26,7 @@
 #include "Arduino.h"
 #include "HardwareSerial.h"
 
-#if defined(HAL_UART_MODULE_ENABLED)
+#if defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
 #if defined(HAVE_HWSERIAL1) || defined(HAVE_HWSERIAL2) || defined(HAVE_HWSERIAL3) ||\
     defined(HAVE_HWSERIAL4) || defined(HAVE_HWSERIAL5) || defined(HAVE_HWSERIAL6) ||\
     defined(HAVE_HWSERIAL7) || defined(HAVE_HWSERIAL8) || defined(HAVE_HWSERIAL9) ||\
@@ -528,4 +528,4 @@ void HardwareSerial::enableHalfDuplexRx(void)
   }
 }
 
-#endif // HAL_UART_MODULE_ENABLED
+#endif // HAL_UART_MODULE_ENABLED && !HAL_UART_MODULE_ONLY

cores/arduino/WSerial.h

@@ -21,7 +21,7 @@
 extern void serialEventUSB(void) __attribute__((weak));
 #endif /* USBCON && USBD_USE_CDC */
 
-#if defined(HAL_UART_MODULE_ENABLED)
+#if defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
 #if !defined(HWSERIAL_NONE) && defined(SERIAL_UART_INSTANCE)
 #if SERIAL_UART_INSTANCE == 0
 #define ENABLE_HWSERIALLP1
@@ -163,7 +163,7 @@ extern void serialEvent8(void) __attribute__((weak));
 extern void serialEvent9(void) __attribute__((weak));
 extern void serialEvent10(void) __attribute__((weak));
 extern void serialEventLP1(void) __attribute__((weak));
-#endif /* HAL_UART_MODULE_ENABLED */
+#endif /* HAL_UART_MODULE_ENABLED  && !HAL_UART_MODULE_ONLY */
 
 extern void serialEventRun(void) __attribute__((weak));
 

cores/arduino/stm32/low_power.c

@@ -45,7 +45,7 @@
 extern "C" {
 #endif
 
-#if defined(UART_IT_WUF) && defined(HAL_UART_MODULE_ENABLED)
+#if defined(UART_IT_WUF) && defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
 /* Save UART handler for callback */
 static UART_HandleTypeDef *WakeUpUart = NULL;
 #endif
@@ -209,7 +209,7 @@ void LowPower_stop(serial_t *obj)
 {
   __disable_irq();
 
-#if defined(UART_IT_WUF) && defined(HAL_UART_MODULE_ENABLED)
+#if defined(UART_IT_WUF) && defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
   if (WakeUpUart != NULL) {
     HAL_UARTEx_EnableStopMode(WakeUpUart);
   }
@@ -232,7 +232,7 @@ void LowPower_stop(serial_t *obj)
 
   /* Exit Stop mode reset clocks */
   SystemClock_ConfigFromStop();
-#if defined(UART_IT_WUF) && defined(HAL_UART_MODULE_ENABLED)
+#if defined(UART_IT_WUF) && defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
   if (WakeUpUart != NULL) {
     /* In case of WakeUp from UART, reset its clock source to HSI */
     uart_config_lowpower(obj);
@@ -301,7 +301,7 @@ void LowPower_shutdown()
   */
 void LowPower_EnableWakeUpUart(serial_t *serial, void (*FuncPtr)(void))
 {
-#if defined(UART_IT_WUF) && defined(HAL_UART_MODULE_ENABLED)
+#if defined(UART_IT_WUF) && defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
   UART_WakeUpTypeDef WakeUpSelection;
   if (serial == NULL) {
     return;

cores/arduino/stm32/uart.c

@@ -41,7 +41,7 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-#if defined(HAL_UART_MODULE_ENABLED)
+#if defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
 
 /* If DEBUG_UART is not defined assume this is the one linked to PIN_SERIAL_TX */
 #if !defined(DEBUG_UART)
@@ -1066,7 +1066,7 @@ void HAL_UARTEx_WakeupCallback(UART_HandleTypeDef *huart)
   serial_t *obj = get_serial_obj(huart);
   HAL_UART_Receive_IT(huart,  &(obj->recv), 1);
 }
-#endif /* HAL_UART_MODULE_ENABLED */
+#endif /* HAL_UART_MODULE_ENABLED  && !HAL_UART_MODULE_ONLY */
 
 #ifdef __cplusplus
 }

cores/arduino/stm32/uart.h

@@ -45,7 +45,7 @@
 extern "C" {
 #endif
 
-#if !defined(HAL_UART_MODULE_ENABLED)
+#if !defined(HAL_UART_MODULE_ENABLED) || defined(HAL_UART_MODULE_ONLY)
 #define serial_t void*
 #else
 
@@ -186,7 +186,7 @@ void uart_enable_rx(serial_t *obj);
 
 size_t uart_debug_write(uint8_t *data, uint32_t size);
 
-#endif /* HAL_UART_MODULE_ENABLED */
+#endif /* HAL_UART_MODULE_ENABLED  && !HAL_UART_MODULE_ONLY */
 #ifdef __cplusplus
 }
 #endif

libraries/SrcWrapper/src/syscalls.c

@@ -84,7 +84,7 @@ int _read(UNUSED(int file), UNUSED(char *ptr), UNUSED(int len))
 __attribute__((weak))
 int _write(UNUSED(int file), char *ptr, int len)
 {
-#ifdef HAL_UART_MODULE_ENABLED
+#if defined(HAL_UART_MODULE_ENABLED) && !defined(HAL_UART_MODULE_ONLY)
   return uart_debug_write((uint8_t *)ptr, (uint32_t)len);
 #else
   (void)ptr;