Help with FD-CAN filter

[prigo87]

Hello,

I work with STM32G484, with FDCAN. I want to create filter so only messages with my own CAN_ID will reach HAL_FDCAN_RxFifo0Callback.

I started by define the filter:

filter.IdType = FDCAN_STANDARD_ID;

filter.FilterIndex = 0;

filter.FilterType = FDCAN_FILTER_MASK;

filter.FilterConfig = FDCAN_FILTER_TO_RXFIFO0;

filter.FilterID1 = CAN_ID;

filter.FilterID2 = 0x1FFFFFFF;

HAL_FDCAN_ConfigFilter(&hfdcan1, &filter);

At this point the filter not realy doing anything, and I still getting other nodes ID in the callback.

I tried to add a global filter with:
HAL_FDCAN_ConfigGlobalFilter(&hfdcan1, FDCAN_REJECT, FDCAN_REJECT, FDCAN_REJECT_REMOTE, FDCAN_REJECT_REMOTE);

but now i reject also my own ID.

What I miss here? what is the correct way to define the filter?

Thanks in advance,
Amit Prigozin

[Tinnagit]

I'm unsure but I have HAL_FDCAN_Start and HAL_FDCAN_ActivateNotification with FDCAN_IT_RX_FIFO0_NEW_MESSAGE for active interrupt on every new message in HAL_FDCAN_RxFifo0Callback

and you also need to have HAL_FDCAN_ActivateNotification in FDCAN RX callback too.

[prigo87]

I did all of this of course.
The problem is with the filter setting

Thank you

[Tinnagit]

I had read your can config and your CAN id that I think that it's not oversize of Standard ID. I think it's an extended id.
so you should try to change IdType to extended one.

[prigo87]

i work with CAN-ID of 10 to 200. So its not a problem of ID length. Any way I changed the ID type to extend and it still not working - passing all with regular filter only, and block all with the global filter

[PGrif.2]

Hi prigo87!

Did you solve the issue? Mine is related:

H723 FDCAN1 and FDCAN2 - Page 2 - STMicroelectronics Community

Cheers!

[Ben_A]

I had this exact problem when trying to modify a project from extended IDs to standard IDs.  In my case it turned out I had the FDCAN peripheral configured incorrectly in the .ioc file:  it was set for 8 extended filter IDs and 0 standard filter IDs.

[dqsh06]

i has solved this issue as below

    // 设置接收过滤器
    FDCAN_FilterTypeDef sFilterConfig;
    sFilterConfig.IdType = FDCAN_STANDARD_ID;
    sFilterConfig.FilterIndex = 0;
    sFilterConfig.FilterType = FDCAN_FILTER_MASK;
    sFilterConfig.FilterConfig = FDCAN_FILTER_TO_RXFIFO0;
    sFilterConfig.FilterID1 = 0x002; // 设置过滤器ID1
    sFilterConfig.FilterID2 = 0x7ff; // 设置过滤器ID2
    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();
    }

hfdcan1.Init.StdFiltersNbr = 1;

you did not solve it, because you did not modify the stdFiltersNbr.

hope this will help you.