initial stuff for recieving from can

firmware/components/mainboard/stmf446retx/Src/main.c

@@ -71,6 +71,8 @@ KbdPins col_pins[COLS] = {
   {GPIOB, GPIO_PIN_13}
 };
 HIDReport REPORT = {0,0,0,0,0,0,0,0};
+CAN_RxHeaderTypeDef RxHeader;
+uint8_t RxData[8];
 /* USER CODE END PV */
 
 /* Private function prototypes -----------------------------------------------*/
@@ -116,7 +118,9 @@ int main(void)
   MX_CAN1_Init();
   MX_USB_DEVICE_Init();
   /* USER CODE BEGIN 2 */
-
+  HAL_CAN_Start(&hcan1);
+  HAL_CAN_ActivateNotification(&hcan1, CAN_IT_RX_FIFO0_MSG_PENDING);
+  HAL_Delay(50);
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -127,7 +131,6 @@ int main(void)
     /* USER CODE END WHILE */
     for(int col = 0; col < COLS; col++){
       HAL_GPIO_WritePin(col_pins[col].PORT, col_pins[col].PIN, GPIO_PIN_SET);
-      HAL_Delay(1);
       for(int row = 0; row < ROWS; row++){
         if(HAL_GPIO_ReadPin(row_pins[row].PORT, row_pins[row].PIN)){
           addHIDReport(matrix[row][col], 1);
@@ -143,6 +146,12 @@ int main(void)
   }
   /* USER CODE END 3 */
 }
+
+void HAL_CAN_RxFifo0MsgPendingCallback(CAN_HandleTypeDef *hcan)
+{
+  HAL_CAN_GetRxMessage(hcan, CAN_RX_FIFO0, &RxHeader, RxData);
+  addHIDReport(RxData[0], (RxData[1] & (1 << 7)) ? 1 : 0);
+}
 /**
   * @brief System Clock Configuration
   * @retval None