[参考译文] LAUNCHXL-F280039C：MCAN 发送和接收以 2Mbps 速度进行波特率设置

尊敬的 Narsimha：

mcan_ex4_receive 示例使用标准 ID（11 位长度）、需要消息 ID 为 4。  检查这是否是由发送节点设置的消息 ID 配置。  似乎代码正在进入 ISR 例程、但它没有接收到正确的 ID、因此无法读取消息帧。

这是消息 ID 配置的那一部分：

    //
    // Initialize Message RAM Sections Configuration Parameters
    //
    msgRAMConfigParams.flssa                = MCAN_STD_ID_FILT_START_ADDR;
    // Standard ID Filter List Start Address.
    msgRAMConfigParams.lss                  = MCAN_STD_ID_FILTER_NUM;
    // List Size: Standard ID.
    msgRAMConfigParams.rxBufStartAddr       = MCAN_RX_BUFF_START_ADDR;
    // Rx Buffer Start Address.
    msgRAMConfigParams.rxBufElemSize        = MCAN_RX_BUFF_ELEM_SIZE;
    // Rx Buffer Element Size.

    //
    // Initialize Rx Buffer Configuration parameters.
    //
    stdFiltelem.sfid2              = 0x0U; // Standard Filter ID 2.
    // Configuring received frame to be stored in buffer element 0
    stdFiltelem.sfid1              = 0x4U; // Standard Filter ID 1.
    // Confifuring frames with msg ID = 0x4U to be accepted by filter element
    stdFiltelem.sfec               = 0x7U; // Store into Rx Buffer
                                           // configuration of SFT[1:0] ignored

在 ISR 中、如果收到正确的消息 ID、代码将执行的分支应该是：

    //
    //  Check to see if the interrupt is caused by a message being
    //  received in dedicated RX Buffers
    //
    if((MCAN_INTR_SRC_DEDICATED_RX_BUFF_MSG & intrStatus) == MCAN_INTR_SRC_DEDICATED_RX_BUFF_MSG)
    {
        //
        // Read the NewData registers
        //
        MCAN_getNewDataStatus(MCANA_DRIVER_BASE, &newData);

        //  If message is received in buffer element 0
        if((newData.statusLow & (1UL << 0U)) != 0)
        {
            MCAN_readMsgRam(MCANA_DRIVER_BASE, MCAN_MEM_TYPE_BUF, 0U,
                          0, &rxMsg1);

            rxMsg[loopCnt] = rxMsg1;
        }

        //
        //  Clearing the NewData registers
        //
        MCAN_clearNewDataStatus(MCANA_DRIVER_BASE, &newData);
    }
    else

此致、

Joseph