Compiler/TMS570LS0914: TMS570LS0914 Example for SCI TX with DMA

Tool/software: TI C/C++ Compiler

Hi

I trying to prepare a simple example with the SCI-LIN interface that transmits data via DMA. I found various examples for similar processors but it seems I miss something important. The SCI LIN interface seems to be set up properly, I can send and receive data. But as soon as I switch to DMA mode no data is transmitted. I set up the basic project via HalCoGen.

What I cannot figure out is:

• What is the correct DMA request line for the SCI-LIN?
• Do I have to set up special memory settings? I use standard MPU settings.
• Do I need to set any special settings in HalCoGen?
• Are there any speed limits? I use 500'000 Baud.

I use the following procedure:

// Global data
U8 hello[] = "*** Hello World ***\r";

// Within Main function
    dmaReqAssign(DMA_CH0, 27); //is 27 correct ???

    g_dmaCTRL ctrl = {
            .CHCTRL = 0,
            .SADD = (uint32) hello, /* source address */
            .DADD = ((uint32) &(scilinREG->TD)) + 3, /* initial dest. address, big endian */
            .RDSIZE = ACCESS_8_BIT,/* readsize*/
            .WRSIZE = ACCESS_8_BIT,/* writesize*/
            .ELCNT = 1, /* element count */
            .FRCNT = 20, /* frame count*/
            .PORTASGN = 4,
            .TTYPE = FRAME_TRANSFER,
            .ADDMODERD = ADDR_INC1, /* address mode read */
            .ADDMODEWR = ADDR_FIXED, /* address mode write */
            .AUTOINIT = AUTOINIT_OFF
    };

    /* - setting dma controlpacketsfor transmi t*/
    dmaSetCtrlPacket(DMA_CH0, ctrl);
    /* - setting the dma channelto triggeron h/w request */
    dmaSetChEnable(DMA_CH0, DMA_HW);
    dmaEnable();

    while ((dmaREG->GCTRL & DMA_GCTRL_BUSBUSY) != 0U)  {
     } /* Wait */

    /* EnableTX DMA */
    scilinREG->SETINT |= (1 << 16);

Thanks for any help.
Best regards, Valentin