Allow to redefine Exception handler

Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

cores/arduino/stm32/hw_config.c

@@ -121,7 +121,7 @@ void hw_config_init(void)
 /**
 * @brief This function handles Non maskable interrupt.
 */
-void NMI_Handler(void)
+void __attribute__((weak)) NMI_Handler(void)
 {
   /* USER CODE BEGIN NonMaskableInt_IRQn 0 */
 
@@ -136,7 +136,7 @@ void NMI_Handler(void)
 /**
 * @brief This function handles Hard fault interrupt.
 */
-void HardFault_Handler(void)
+void __attribute__((weak)) HardFault_Handler(void)
 {
   /* USER CODE BEGIN HardFault_IRQn 0 */
 
@@ -152,7 +152,7 @@ void HardFault_Handler(void)
 /**
 * @brief This function handles Memory management fault.
 */
-void MemManage_Handler(void)
+void __attribute__((weak)) MemManage_Handler(void)
 {
 
   /* USER CODE BEGIN MemoryManagement_IRQn 0 */
@@ -169,7 +169,7 @@ void MemManage_Handler(void)
 /**
 * @brief This function handles Pre-fetch fault, memory access fault.
 */
-void BusFault_Handler(void)
+void __attribute__((weak)) BusFault_Handler(void)
 {
 
   /* USER CODE BEGIN BusFault_IRQn 0 */
@@ -186,7 +186,7 @@ void BusFault_Handler(void)
 /**
 * @brief This function handles Undefined instruction or illegal state.
 */
-void UsageFault_Handler(void)
+void __attribute__((weak)) UsageFault_Handler(void)
 {
 
   /* USER CODE BEGIN UsageFault_IRQn 0 */
@@ -203,7 +203,7 @@ void UsageFault_Handler(void)
 /**
 * @brief This function handles Debug monitor.
 */
-void DebugMon_Handler(void)
+void __attribute__((weak)) DebugMon_Handler(void)
 {
 
   /* USER CODE BEGIN DebugMonitor_IRQn 0 */