LPC54XX CAN 如何配置

xiaolun217001

#define MSG_RAM_BASE 0x20010000U
#define STD_FILTER_OFS 0x0
#define RX_FIFO0_OFS 0x10U
#define TX_BUFFER_OFS 0x20U


    MCAN_GetDefaultConfig(&mcanConfig);
    MCAN_Init(EXAMPLE_MCAN, &mcanConfig, MCAN_CLK_FREQ);

    /* Create MCAN handle structure and set call back function. */
    MCAN_TransferCreateHandle(EXAMPLE_MCAN, &mcanHandle, mcan_callback, NULL);

    /* Set Message RAM base address and clear to avoid BEU/BEC error. */
    MCAN_SetMsgRAMBase(EXAMPLE_MCAN, MSG_RAM_BASE);
    uint32_t *p=(uint32_t *)(MSG_RAM_BASE);
    memset(p, 0, TX_BUFFER_OFS + 0x10U);

    /* STD filter config. */
    rxFilter.address = STD_FILTER_OFS;
    rxFilter.idFormat = kMCAN_FrameIDStandard;
    rxFilter.listSize = 1U;
    rxFilter.nmFrame = kMCAN_reject0;
    rxFilter.remFrame = kMCAN_rejectFrame;
    MCAN_SetFilterConfig(EXAMPLE_MCAN, &rxFilter);

    stdFilter.sfec = kMCAN_storeinFifo0;
    /* Classic filter mode, only filter matching ID. */
    stdFilter.sft = kMCAN_classic;
    stdFilter.sfid1 = rxIdentifier;
    stdFilter.sfid2 = 0x7FFU;
    MCAN_SetSTDFilterElement(EXAMPLE_MCAN, &rxFilter, &stdFilter, 0);

    /* RX fifo0 config. */
    rxFifo0.address = RX_FIFO0_OFS;
    rxFifo0.elementSize = 1U;
    rxFifo0.watermark = 0;
    rxFifo0.opmode = kMCAN_FifoBlocking;
    rxFifo0.datafieldSize = kMCAN_8ByteDatafield;
    MCAN_SetRxFifo0Config(EXAMPLE_MCAN, &rxFifo0);

    /* TX buffer config. */
    txBuffer.address = TX_BUFFER_OFS;
    txBuffer.dedicatedSize = 1U;
    txBuffer.fqSize = 0;
    txBuffer.datafieldSize = kMCAN_8ByteDatafield;
    MCAN_SetTxBufferConfig(EXAMPLE_MCAN, &txBuffer);

    /* Finish software initialization and enter normal mode, synchronizes to
       CAN bus, ready for communication */
    MCAN_EnterNormalMode(EXAMPLE_MCAN);

xiaolun217001

这是例程上的配置，配置 Message RAM应配置多大？收发元素大小应该配置多少？挣不清楚，手册写的比较简单，看不出怎么配置

eric2013

不了解LPC，帮顶下。