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TI Home » TI E2E Community » Support Forums » Microcontrollers » C2000™ Microcontrollers » C2000 32-bit Microcontrollers Forum » Concerto (DSP -> SCI-A) Comm Issue: bytes submitted to the peripheral are not what is sent out the port
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  • Concerto (DSP -> SCI-A) Comm Issue: bytes submitted to the peripheral are not what is sent out the port

    Concerto (DSP -> SCI-A) Comm Issue: bytes submitted to the peripheral are not what is sent out the port

    This question is answered
    Nick Neander
    Posted by Nick Neander
    on Apr 06 2012 12:54 PM
    Intellectual450 points

    Hello,

    I am getting strange output from the serial port of the DSP.

    Here is the code used to submit the desired bytes to the SCI peripheral;

    // toggle the control program valves
    #pragma CODE_SECTION(ToggleValves, "ramfuncs")
    void ToggleValves(unsigned long count)
    {
        unsigned char idx, state = 0, check = 0x86;

        if ((count % 2) == 0)
        {
            state = 0xff;
            check = 0x0e;
        }

        while (SciaRegs.SCIFFTX.bit.TXFFST == 16) ;
        SciaRegs.SCITXBUF = 0x76;
        while (SciaRegs.SCIFFTX.bit.TXFFST > 11) ;
        for (idx = 0; idx < 5; idx++) SciaRegs.SCITXBUF = 0xff;
        while (SciaRegs.SCIFFTX.bit.TXFFST > 10) ;
        for (idx = 0; idx < 5; idx++) SciaRegs.SCITXBUF = state;
        SciaRegs.SCITXBUF = check;
    }

    NOTE: I put the checks against the TXFFST reg as a troubleshooting step when I saw the strange output. This was an attempt to prevent submitting to many bytes to the fifo the output didn't change with the addition of these lines.

    Here is the output;

    What am I doing wrong?

    Thanks and God Bless!!!

    PS. The listener app is sound.

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    • Nick Neander
      Posted by Nick Neander
      on Apr 07 2012 19:58 PM
      Verified Answer
      Verified by Nick Neander
      Intellectual450 points

      Nevermind!

      I'm not sure how but the baud rate was off.. Don't I feel silly

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