STM32F091 CAN Filter Setup

[Junbo Yi]

Posted on June 29, 2015 at 21:20

Hi, 

I'm using HAL functions for F0 and F1 to setup CAN filters to allow message only with global id (here is 0) and node id(here is 0x02) to be received. The F1(STM32F103CB) is working fine, but F0(STM32F091CC) only received the message with global id. If filters are disabled, thenF0 received all the message.Any comments on this issue?See the source codes below.Thanks.JYI

HAL_StatusTypeDef MX_CAN_Config(void)

{ CAN_FilterConfTypeDef  sFilterConfig; uint32_t nodeAddress=(uint32_t)0x02; // can node id to for rx message filtering /* Configure the CAN Filter 0 for FIFO 0 with node id */    sFilterConfig.FilterNumber = 0;    sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;    sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;    sFilterConfig.FilterIdHigh = (nodeAddress << 7) & 0x3F80; // 7-bit for rx message filtering    sFilterConfig.FilterIdLow = 0;    sFilterConfig.FilterMaskIdHigh = 0x3F80;    sFilterConfig.FilterMaskIdLow = 0;    sFilterConfig.FilterFIFOAssignment = CAN_FIFO0;    sFilterConfig.FilterActivation = ENABLE;    sFilterConfig.BankNumber = 14;    if(HAL_CAN_ConfigFilter(&hcan, &sFilterConfig) != HAL_OK)    {    return HAL_ERROR;    }        /* Configure the CAN Filter 1 FIFO 0 for global id=0 */    sFilterConfig.FilterNumber = 1;    sFilterConfig.FilterIdHigh = 0;    sFilterConfig.FilterFIFOAssignment = CAN_FIFO0;    if(HAL_CAN_ConfigFilter(&hcan, &sFilterConfig) != HAL_OK)    {    return HAL_ERROR;    }       // set buffer pointers    hcan.pTxMsg = &TxMessage;    hcan.pRxMsg = &RxMessage;    /* Configure Transmission process */    hcan.pTxMsg->RTR = CAN_RTR_DATA;    hcan.pTxMsg->IDE = CAN_ID_EXT;    hcan.pTxMsg->DLC = 0;    // enable can rx with interruptions    HAL_CAN_Receive_IT(&hcan, CAN_FIFO0);    HAL_CAN_Receive_IT(&hcan, CAN_FIFO1);    return HAL_OK;} #f0-can-filters

[chrif]

Posted on July 01, 2015 at 14:44

Hi,

1-At the end, this line of code  '' HAL_CAN_Receive_IT(&hcan, CAN_FIFO1);''  is mentioning FIFO1, but FIFO1 does not appear in previous lines. Do you use it in another part of code? 2-Otherwise, I propose another solution. Configure two filter with two FIFOs, each filter is related to one FIFO.

/* Configure the CAN Filter 0 for FIFO 0 with node id */

sFilterConfig.FilterNumber = 0; sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK; sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;

sFilterConfig.FilterIdHigh =0x0000;

sFilterConfig.FilterIdLow = 0x0000; sFilterConfig.FilterMaskIdHigh = 0x0000; sFilterConfig.FilterMaskIdLow = 0x0000; sFilterConfig.FilterFIFOAssignment = CAN_FIFO0; sFilterConfig.FilterActivation = ENABLE; sFilterConfig.BankNumber = 14; if(HAL_CAN_ConfigFilter(&hcan, &sFilterConfig) != HAL_OK) { return HAL_ERROR; }

/* Configure the CAN Filter 1 for FIFO 1 with node id */

sFilterConfig.FilterNumber = 1; sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK; sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT; sFilterConfig.FilterIdHigh =0x0000; sFilterConfig.FilterIdLow = 0x0000; sFilterConfig.FilterMaskIdHigh = 0x0000; sFilterConfig.FilterMaskIdLow = 0x0000; sFilterConfig.FilterFIFOAssignment = CAN_FIFO1; sFilterConfig.FilterActivation = ENABLE; sFilterConfig.BankNumber = 14; if(HAL_CAN_ConfigFilter(&hcan, &sFilterConfig) != HAL_OK) { return HAL_ERROR; } Regards