[参考译文] J721EXSOMXEVM：通过 SPI3 和 SPI6 发送数据只会发送一个字节

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https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1526811/j721exsomxevm-transmitting-data-over-spi3-and-spi6-only-transmits-one-byte

器件型号：J721EXSOMXEVM

工具/软件：

我从 TVALVM 板上移植到了带有 SOM 的完整 J721E 板、现在通过 GESI 板访问 MCSPI3 和 MCSPI6。我将使用 MCU2_1、FreeRTOS、使用带 PDK 的 10.x TI SDK。

我观察到我可以成功地在每个上发送和接收、但在我尝试过的每种情况下、我只发送一个字节。我希望整个信息都能传达出来。

任务已启动：

void spi_test_master_cb(void *arg0, void *arg1)
{
    UART_printf("Starting SPI Master test. \n");
    TaskP_sleepInMsecs(1000);
    uint32_t  terminateXfer = 1;

    SPI_init();

    // == Set up the SPI test for receive ==
    SPI_Handle        spi;
    SPI_Params        spiParams;

    // Creates a callback semaphore
    SPI_osalSemParamsInit(&cbSemParams);
    cbSemParams.mode = SemaphoreP_Mode_BINARY;
    cbSem[0] = SPI_osalCreateBlockingLock(0, &cbSemParams);

    uint32_t instance = MCSPI3_CONFIG_IDX; 
    uint32_t domain = SPI_MCSPI_DOMAIN_MAIN;

    // MCSPI_socInit();

    SPI_HWAttrs spi_cfg;
    SPI_socGetInitCfg(domain, instance, &spi_cfg);
    spi_cfg.enableIntr = BFALSE; 
    spi_cfg.edmaHandle = NULL;
    spi_cfg.dmaMode    = BFALSE;

    /* Set the SPI init configurations */
    spi_cfg.chNum = 0;
    spi_cfg.chnCfg[0].dataLineCommMode = MCSPI_DATA_LINE_COMM_MODE_6;
    spi_cfg.chnCfg[0].tcs = MCSPI_CS_TCS_0PNT5_CLK;
    spi_cfg.chnCfg[0].trMode = MCSPI_TX_ONLY_MODE;

    /* Set the SPI init configurations */
    SPI_socSetInitCfg(domain, instance, &spi_cfg);

    /* Initialize SPI handle */
    SPI_Params_init(&spiParams);
    spiParams.mode = SPI_MASTER;
    spiParams.transferMode = SPI_MODE_BLOCKING;
    spiParams.transferTimeout = SemaphoreP_WAIT_FOREVER;
    spiParams.frameFormat = SPI_POL1_PHA0;
    spiParams.dataSize = 8U; // 8 bits
    spiParams.bitRate = 468750;

    spi = SPI_open(domain, instance, &spiParams);

    if (NULL == spi)
    {
        UART_printf("Error initializing SPI\n");
        return;
    }

    uint32_t num_xfers = 0;
    uint32_t xfer_len = SPI_MSG_LENGTH; //8

    Osal_delay(500);

    // Attempt a transfer
    // uintptr_t addrMasterRxBuf = (uintptr_t)masterRxBuffer;
    uintptr_t addrMasterTxBuf = (uintptr_t)masterTxBuffer;
    bool transferOK = true;

    // memset(masterRxBuffer, 0, sizeof(masterRxBuffer));
    memset(masterTxBuffer, 0, sizeof(masterTxBuffer));

    while (1)
    {

        memcpy(masterTxBuffer, "TEST1234", 8);

        SPI_Transaction   transaction;
        transaction.count = xfer_len;
        transaction.arg = (void *)&terminateXfer;
        transaction.txBuf = (void *)addrMasterTxBuf;
        transaction.rxBuf = NULL; // (void *)addrMasterRxBuf;
        
        transferOK = SPI_transfer((SPI_Handle)spi, &transaction);
        if (!transferOK)
        {
            UART_printf("Error in SPI transfer\n");
        }
        else
        {   
            UART_printf("SPI transfer successful.\n");

        }
        Osal_delay(10);

    }
}