Edge trigger works

Core/Src/main.c

@@ -66,11 +66,7 @@ int _write(int file, char *ptr, int len) {
 
 void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
 {
-    uint32_t current_count = EXT_TIMER.Instance->CNT;
-    uint32_t difference = current_count-last_count;
 
-    last_count = current_count;
-    printf("%d\n", difference);
 }
 
 void USB_CDC_RxHandler(uint8_t* Buf, uint32_t Len)
@@ -85,6 +81,34 @@ void USB_CDC_RxHandler(uint8_t* Buf, uint32_t Len)
 
 }
 
+uint32_t check_pin_state()
+{
+    return  HAL_GPIO_ReadPin(PIN_GPIO_Port, PIN_Pin);
+}
+
+void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
+{
+    uint32_t current_count = EXT_TIMER.Instance->CNT;
+
+    if (check_pin_state() )
+  {
+//      printf("RISING\n");
+        //Reset
+        last_count = current_count;
+
+  }
+  else
+  {
+//      printf("FALLING\n");
+        //Send
+        uint32_t difference = current_count-last_count;
+
+
+        printf("%d\n", difference);
+  }
+
+}
+
 void receive_handler();
 /* USER CODE END PFP */
 
@@ -295,6 +319,7 @@ static void MX_TIM2_Init(void)
   */
 static void MX_GPIO_Init(void)
 {
+  GPIO_InitTypeDef GPIO_InitStruct = {0};
 /* USER CODE BEGIN MX_GPIO_Init_1 */
 /* USER CODE END MX_GPIO_Init_1 */
 
@@ -302,6 +327,16 @@ static void MX_GPIO_Init(void)
   __HAL_RCC_GPIOF_CLK_ENABLE();
   __HAL_RCC_GPIOA_CLK_ENABLE();
 
+  /*Configure GPIO pin : PIN_Pin */
+  GPIO_InitStruct.Pin = PIN_Pin;
+  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
+  GPIO_InitStruct.Pull = GPIO_PULLUP;
+  HAL_GPIO_Init(PIN_GPIO_Port, &GPIO_InitStruct);
+
+  /* EXTI interrupt init*/
+  HAL_NVIC_SetPriority(EXTI1_IRQn, 0, 0);
+  HAL_NVIC_EnableIRQ(EXTI1_IRQn);
+
 /* USER CODE BEGIN MX_GPIO_Init_2 */
 /* USER CODE END MX_GPIO_Init_2 */
 }

Core/Src/stm32g4xx_it.c

@@ -199,6 +199,20 @@ void SysTick_Handler(void)
 /* please refer to the startup file (startup_stm32g4xx.s).                    */
 /******************************************************************************/
 
+/**
+  * @brief This function handles EXTI line1 interrupt.
+  */
+void EXTI1_IRQHandler(void)
+{
+  /* USER CODE BEGIN EXTI1_IRQn 0 */
+
+  /* USER CODE END EXTI1_IRQn 0 */
+  HAL_GPIO_EXTI_IRQHandler(PIN_Pin);
+  /* USER CODE BEGIN EXTI1_IRQn 1 */
+
+  /* USER CODE END EXTI1_IRQn 1 */
+}
+
 /**
   * @brief This function handles USB low priority interrupt remap.
   */