STM32F072XX CAN 寄存器RDT0R的FMI位调试疑问

耶不耶 · 发表于 2018-10-12 15:50:17

本帖最后由耶不耶于 2018-10-12 16:59 编辑

先说问题，RDT0R的FMI位是通过的过滤器的编号，可是我在调试观测到hcan->pRxMsg->FMI=2，但是寄存器RDT0R中的FMI位等于0.

RDT0R的FMI和hcan->pRxMsg->FMI不一致

附上滤波器配置代码：
[mw_shl_code=c,true]       CAN_FilterConfTypeDef sFilterConfig;
      uint32_t StdId =0x321;
      uint32_t ExtId =0x1800f001;
      sFilterConfig.FilterNumber = 0;
      sFilterConfig.FilterMode = CAN_FILTERMODE_IDLIST;
      sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
      sFilterConfig.FilterIdHigh = StdId<<5;
      sFilterConfig.FilterIdLow = 0|CAN_ID_STD;
      sFilterConfig.FilterMaskIdHigh = ((ExtId<<3)>>16)&0xffff;
      sFilterConfig.FilterMaskIdLow = (ExtId<<3)&0xffff|CAN_ID_EXT;
      sFilterConfig.FilterFIFOAssignment = 0;
      sFilterConfig.FilterActivation = ENABLE;
      sFilterConfig.BankNumber = 14;

      if(HAL_CAN_ConfigFilter(&hcan, &sFilterConfig) != HAL_OK)
      {
            Error_Handler();
      }

      sFilterConfig.FilterNumber = 1;
      sFilterConfig.FilterMode = CAN_FILTERMODE_IDLIST;
      sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
      sFilterConfig.FilterIdHigh = StdId<<5;
      sFilterConfig.FilterIdLow = 0|CAN_ID_STD|CAN_RTR_REMOTE;
      sFilterConfig.FilterMaskIdHigh = ((ExtId<<3)>>16)&0xffff;
      sFilterConfig.FilterMaskIdLow = (ExtId<<3)&0xffff|CAN_ID_EXT;
      sFilterConfig.FilterFIFOAssignment = 0;
      sFilterConfig.FilterActivation = ENABLE;
      sFilterConfig.BankNumber = 14;
      if(HAL_CAN_ConfigFilter(&hcan, &sFilterConfig) != HAL_OK)
      {
            Error_Handler();
      }[/mw_shl_code]
然而这两个不应该是一样的值吗？附上寄存器RDT0R的说明：

寄存器RDT0R