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UART GUI composer F28035

Sandhya Jetti
Intellectual 535 points

Hello all,

I recently started using GUI composer (on my custom circuit board with F28035) and it works great with USB JTAG connection. Now I am trying to make it work with UART connection.

Found this pdf and followed the instructions but still couldn't make it running

http://processors.wiki.ti.com/index.php/ProgramModelUart_GuiComposer

This is the error:

ComPort: Trouble Reading Memory Block at 0x9900 on Page 1 of Length 0x1: **Error**: Serial Communication failed at port: COM5, baud rate:57600!

I would expect the UART connection to suspend at main but it keeps running and i cannot suspend it.

Also looks like it requires Uart monitor running on the target but how do i do that?


Any help is appreciated!

Sandhya

  • TI__Intellectual 2170 points

    In the error message "...Communication failed at port: COM5, baud rate:57600!" I see the baud rate is set to 57600. 

    Would you be able to try 9600? 

  • in reply to Dobrin Alexiev
    Intellectual 535 points

    Changed to 9600 in .ccxml and device manager/COM5/properties, still same error

    Does it have to do with boot mode?

    I think that TRST is 1 and

    by default, TD0(GPIO37) =1 and GPIO34 = 1

  • in reply to Sandhya Jetti
    TI__Intellectual 2170 points

    You need to change the target program to 9600 as well.

  • in reply to Dobrin Alexiev
    Intellectual 535 points

    how?

    appreciate your help

    Sandhya

  • in reply to Sandhya Jetti
    Intellectual 535 points

    These are my settings

    SciaRegs.SCIHBAUD    =0x0000;  // 9600 baud @LSPCLK = 15MHz (60 MHz SYSCLK).
    SciaRegs.SCILBAUD    =0x00C2;

    #define DSP28_DIVSEL   2 // Enable /2 for SYSCLKOUT

    #define DSP28_PLLCR   12    // Uncomment for 60 MHz devices [60 MHz = (10MHz * 12)/2]

    #define CPU_RATE   16.667L   // for a 60MHz CPU clock speed (SYSCLKOUT)

  • in reply to Sandhya Jetti
    TI__Intellectual 2170 points

    Sandhay,

    I see in your first post that you are expecting to see the target in a halted state when you start the UART connection.

                    “I would expect the UART connection to suspend at main…”

    That cannot be the case since the UART monitor on the target needs to run, in order to transfer data between target and PC. 

    The UART connection allows reads and writes of target memory while the target is running. The UART connection requires your target program to be running the UART monitor so it can receive commands for memory reads and writes and send the data back to the PC.

    In order to use the UART connection, your program has to include the UART target monitor. The document http://processors.wiki.ti.com/index.php/ProgramModelUart_GuiComposer describes in details how you can do that. Once you load and run the program with the target monitor, then you can start the UART connection and be able to see or change target memory while the target is running.

    Regards

    Dobrin 

  • in reply to Dobrin Alexiev
    Intellectual 535 points

    Hello Dobrin,

    Now I understand why it doesn't halt at main, thanks a lot for explaining.

    I am following the instructions in that document and I still get the com error as mentioned in my first post. Any ideas on that?


    -Sandhya

  • in reply to Sandhya Jetti
    TI__Genius 15190 points

    Hi Sandhya, 

    UART port speed is definitely incorrect. it should be 9600 baud. Did you change the port speed setting in Device Manager on your PC? See attached picture for what my port setting is on com port where 28035 is attached to. 

    Martin