FDCAN on STM32G0 Filter setup

[JD3]

Hello,

is there any simple example for (STM32G0B1CBT6) or similar where I can simply filter int genration for eg. only for 0x505 id in standart mode. I tested many samples and I believe that there must be some bug in IDE. This is 

 

static void MX_FDCAN2_Init(void)
{

 /* USER CODE BEGIN FDCAN2_Init 0 */

 /* USER CODE END FDCAN2_Init 0 */

 /* USER CODE BEGIN FDCAN2_Init 1 */

 /* USER CODE END FDCAN2_Init 1 */
 hfdcan2.Instance = FDCAN2;
 hfdcan2.Init.ClockDivider = FDCAN_CLOCK_DIV1;
 hfdcan2.Init.FrameFormat = FDCAN_FRAME_CLASSIC;
 hfdcan2.Init.Mode = FDCAN_MODE_NORMAL;
 hfdcan2.Init.AutoRetransmission = DISABLE;
 hfdcan2.Init.TransmitPause = DISABLE;
 hfdcan2.Init.ProtocolException = DISABLE;
 hfdcan2.Init.NominalPrescaler = 16;
 hfdcan2.Init.NominalSyncJumpWidth = 1;
 hfdcan2.Init.NominalTimeSeg1 = 2;
 hfdcan2.Init.NominalTimeSeg2 = 2;
 hfdcan2.Init.DataPrescaler = 1;
 hfdcan2.Init.DataSyncJumpWidth = 1;
 hfdcan2.Init.DataTimeSeg1 = 1;
 hfdcan2.Init.DataTimeSeg2 = 1;
 hfdcan2.Init.StdFiltersNbr = 0;
 hfdcan2.Init.ExtFiltersNbr = 0;
 hfdcan2.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
 if (HAL_FDCAN_Init(&hfdcan2) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN FDCAN2_Init 2 */

 /* USER CODE END FDCAN2_Init 2 */

}

 // CAN initialization
 FDCAN_FilterTypeDef sFilterConfig;

 /* Nastavení počtu filtrů pro standardní ID */
 hfdcan1.Init.StdFiltersNbr = 1;
 hfdcan1.Init.ExtFiltersNbr = 0;

 sFilterConfig.IdType = FDCAN_STANDARD_ID;
 sFilterConfig.FilterIndex = 0; // Use the first filter bank
 sFilterConfig.FilterType = FDCAN_FILTER_MASK; // Specify the filter type
 sFilterConfig.FilterConfig = FDCAN_FILTER_TO_RXFIFO0; // Store matching messages in RX FIFO 0
 sFilterConfig.FilterID1 = 0x505; // filter
 sFilterConfig.FilterID2 = 0x1FF; // mask
 if (HAL_FDCAN_ConfigFilter(&hfdcan1, &sFilterConfig) != HAL_OK)
 {
 Error_Handler();
 }

 if (HAL_FDCAN_ConfigGlobalFilter(&hfdcan1,
	 FDCAN_REJECT,
	 FDCAN_REJECT,
	 FDCAN_REJECT_REMOTE,
	 FDCAN_REJECT_REMOTE) != HAL_OK)
 {
 Error_Handler();
 }

 /* Spuštění FDCAN modulu */
 if (HAL_FDCAN_Start(&hfdcan1) != HAL_OK)
 {
 Error_Handler();
 }

 /* Aktivace přerušení pro FIFO 0 nové zprávy */
 if (HAL_FDCAN_ActivateNotification(&hfdcan1, FDCAN_IT_RX_FIFO0_NEW_MESSAGE, 0) != HAL_OK)
 {
 Error_Handler();
 }

 // CAN initialization END

 

I have played and tried many changes in  sFilterConfig.FilterID2 = 0x1FF; // mask 0x505 and other items.  If I comment or delete HAL_FDCAN_ConfigGlobalFilter then any ID generates interrupt data comes from all id  correctly but it does not filter for 0x505. if using  HAL_FDCAN_ConfigGlobalFilter then it does not generate any int doesnt receive.  

Instead of filter Iam using this method which is not very nice but working for now 

 

void HAL_FDCAN_RxFifo0Callback(FDCAN_HandleTypeDef *hfdcan, uint32_t RxFifo0ITs)
{
	FDCAN_RxHeaderTypeDef 		FDCANRxHeader;
 if((RxFifo0ITs & FDCAN_IT_RX_FIFO0_NEW_MESSAGE) != RESET)
 {
 /* Retrieve Rx messages from RX FIFO0 */
 if (HAL_FDCAN_GetRxMessage(hfdcan, FDCAN_RX_FIFO0, &FDCANRxHeader, canrx_obj.data) != HAL_OK)
 {
 Error_Handler();
 }
	canrx_obj.id =FDCANRxHeader.Identifier;
	canrx_obj.len =FDCANRxHeader.DataLength;

 /* Display LEDx */
 if ((FDCANRxHeader.Identifier == 0x505) && (FDCANRxHeader.IdType == FDCAN_STANDARD_ID))
 {
 lt;
 //LED_Display(RxData[0]);
 //ubKeyNumber = RxData[0];
 }
 }
}

 

Where is the mistake whats wrong ?

Is it compiler bug somwhere?

[mƎALLEm]

Hello @JD3 ,

Your standard filter number is set to 0. Need to set it at least to 1.

hfdcan2.Init.StdFiltersNbr = 0;

 

 

[JD3]

I think it is set to 1 as iam not using extended id, using only FDCAN1: 

 hfdcan1.Init.StdFiltersNbr = 1;
 hfdcan1.Init.ExtFiltersNbr = 0;

 

 

[mƎALLEm]

Confusing code:

---

@JD3 wrote:

I think it is set to 1 as iam not using extended id, using only FDCAN1: 

 hfdcan1.Init.StdFiltersNbr = 1;
 hfdcan1.Init.ExtFiltersNbr = 0;

---

Please review your original post:

Also there are two CAN instances used. You need to clarify exactly what is the problem and on which instance and need to share your code.

[Karl Yamashita]

You've initiated for hfdcan2 but you're setting the filter for hfdcan1.

Or, you're not showing all your code.