Add support for register callbacks

Core/Src/main.c

@@ -92,7 +92,10 @@ int main(void)
   MX_RTC_Init();
   MX_TIM4_Init();
   /* USER CODE BEGIN 2 */
-
+	HAL_CAN_Start(&hcan);
+	HAL_CAN_ActivateNotification(&hcan, CAN_IT_RX_FIFO0_MSG_PENDING | CAN_IT_ERROR | CAN_IT_BUSOFF | CAN_IT_LAST_ERROR_CODE);
+	PROTOCAN_INIT(&hcan, &hrtc, &htim4);
+	PROTOCAN_LOOP();
   /* USER CODE END 2 */
 
   /* Infinite loop */