TMS570LC4357: SPI communication problem in the tmdx570lc43hdk Evaluation Board

Hi Wanzhao,

1. The CS pin should be pulled high when the transfer is done. During the data transmission, the CS pin is pulled down.

2. The SPI clock is not a free-running clock signal. The SPI generates the SPI clock only when the data is written to SPIDAT register.

     The spiSendData() is used to transmits data using interrupt method, so only TX interrupt is enabled. The spiSendAndGetData is to transmit data transmit data and receive data in interrupt mode, so the both TX and RX interrupt are enabled. 

3. The SPI clock is generated by SPI master when data is written to SPIDAT register. I don't fully understand your question.

hello Wang

I can understand your reply, but it can't resolve my problem.

I want to connect the MCP2517FD controller by the SPI bus. the below is the SPI interface requirement.

(1) I try it as the attachment code , but it failed. can you tell me how to configure the SPI port by the HALCoGen tool?1346.tms570lc4357_spitest.rar

(2) I noticed that it require the "8-bit operate mode". I set the charlen = 8 by the HALCoGen, but the API of send and receive in the code that is generated also used the "uint16_t". so how I can use the API? can you give me a example?

Hi Wanzhao,

2. We noticed this issue. Please replace uint16_t with uint8_t manually.

hello 

according to the code as following:

    uint16_t send_data[6] = {0};
    uint16_t recv_data[6] = {0};
    spiDAT1_t dataconfig_t;

    dataconfig_t.CS_HOLD = FALSE;      //CS not set hold mode
    dataconfig_t.WDEL    = TRUE;       //set delay time
    dataconfig_t.DFSEL   = SPI_FMT_0;  //default frame 0
    dataconfig_t.CSNR    = 0xFE;       //default CS0


    send_data[0] = 0x0021;
    send_data[1] = 0x00F0;
    send_data[2] = 0x007F;
    send_data[3] = 0x007F;
    send_data[4] = 0x007F;
    send_data[5] = 0x007F;


    muxInit();
    spiInit();
    _enable_interrupt_();


    while(1)
    {

        DELAY();
        spiSendAndGetData(spiREG2, &dataconfig_t, 6, send_data, recv_data);
        DELAY();
        DELAY();
    }

I find it only send the first data "0021" according to the Oscilloscope.

another problem:

I find that it will set the CS is high when one byte is send, like the picture

can you help me find the reason?