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Send float value through serial port in TMS320F28027

Ashutosh Pailwan1
Expert 2480 points
Other Parts Discussed in Thread: TMS320F28027

Dear

I want to send float value through serial port communication in TMS320F28027

The example project in control suite gives idea to send the character.

Please guide me

  • 0
    TI__Mastermind 21025 points

    A float value can be treated as if it is multiple chars (bytes) concatenated together. It is just bits like a char, but longer. The tricky part is that for f28027, a char is treated as 16-bits, even though it actually only uses 8-bits. So if you define an array of char, each entry is given 16-bits instead of 8.  Use sizeof(float) to determine what the compiler thinks of the length, and you can view the memory of a float variable in the Memory WIndow of the CCS debugger to verify.  Once you're confident of the number of bytes to send, modify your code (or the example) to send that many.

  • 0
    Guru 192875 points
    Hi Ashutosh,

    I use strings to do so. Convert float to string and then transmit.

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Expert 2480 points

    I had used

    Char *msg;

    float x=2.43;

    msg=itoa(x, msg,10);

    xmit(msg);

    But it is not working

    Even I had replaced float with int

    Is there any header file to be added

  • 0 in reply to Ashutosh Pailwan1
    Guru 192875 points
    itoa will work only for integers. so it'll convert 2.43 to integer ie only 2 and eliminate the decimal values.
    You've to use something like this: breakinterview.com/convert-a-floating-point-number-to-string-in-c

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Expert 2480 points

    Dear

    In above there is reverse function for which CCS shows there is error

    Also I have question if I add any header file viz string.h to include some functions does all the contents of string.h gets added to our programming, or only that fiction which is required gets added

  • 0 in reply to Ashutosh Pailwan1
    Expert 2480 points

    dEAR

    i HAD MADE changes to existing Sci_Echoback.c example project

    msg = "\r\n\n\nHello World!\0";
    scia_msg(msg);

    msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";
    scia_msg(msg);
    for(;;)
    {

    msg = "\r\nEnter a character: \0";
    // msg = "\r\n ";
    scia_msg(msg);

    // Wait for inc character

    while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for XRDY =1 for empty state

    // Get character
    ReceivedChar = SciaRegs.SCIRXBUF.all;

    // Echo character back
    msg = "You sent: \0";
    scia_msg(msg);
    scia_xmit(ReceivedChar);
    // adc=(int)(ir_grid*100);
    adc=(int)(12.45);
    ltoa(adc, msg);
    scia_msg(msg);
    }

    The ouput is shown below

    Hello World!
    You will enter a character, and the DSP will echo it back!

    Enter a character: You sent: A12
    Enter a character: 12A12
    Enter a character: 12A12
    Enter a character: 12A12

    Why the number 12 is repeated again and why "You sent" is not displayed