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uart demo on ezdsp5535

james conway
Intellectual 780 points

Hi,

I'm running the uart demo that came with the ezdsp5535. The uart is not responding to characters I enter from my terminal window (teraterm com1, 115200 baud, 8-bit, no parity, 1 stop, no flow). I'm wondering how the terminal window program assigned to com1 on my PC is routed to the USB port that is connected to ezdsp5535 J2? Is there a special program or driver I need to run/install on my PC, or should this connection happen automatically?

Thanks,

Jim

  • 0
    Intellectual 780 points

    The ezdsp5535 board does not have an rs-232 connector. It connects to the PC over USB on the J2 connector. JTAG and UART both use USB on J2 (simultaneously I presume). I don't understand how my PC is supposed to know that com1 (or any com port) should function as a virtual port and route the serial data to the USB port tather than to my PC's rs-232 port.

  • 0 in reply to james conway
    TI__Mastermind 30641 points

    Hi, the VCP driver from FTDI should be installed with CCS... It is also available on http://www.ftdichip.com/FTDrivers.htm#VCP

    Check http://processors.wiki.ti.com/index.php/XDS100#Troubleshooting

    Port A is for JTAG, Port B is for VCP - UART from C55 into XDS100 (FTDI chip) to PC through the J2 USB connector...

    In device manager, you should see "USB Serial Port (COM##)" under Ports... Typically the COM # is higher than 10 for me, but it can change.

    COM1 seems incorrect...

    Check also that DIP SW3 #2 is "ON" - UART_BUFF_EN is pulled down

    Hope this helps,
    Mark

  • 0 in reply to Mark M
    Intellectual 780 points

    Mark,

     The FTDI driver was installed correctly; Com5 is the VCP.  The UART program is now working.

    Thanks for your help.

    Jim

  • 0 in reply to james conway
    Prodigy 50 points

    Hello Mark,

     I am using CCSv4, I tried out the Demo UART code which was available with my eZdsp5535 Kit, I figured out that COM11 is for VCP on my PC so i configured the same in the terminal window of CCSv4, & when i pressed a key it displayed the same key on the terminal window,

    But after i studied the source code of the demo UART project i think when ever i should press a key the output n the Terminal window should be as follows "You have Pressed X Key"(here X is the key which is being pressed).

    So i am confused that is my code working well or not.

    I have also tried out configuring all other ports listed under the Terminal window of CCSv4, but except COM11 none of the other port gives any output. 

    So i am sure that COM11is for VP but i am not sure about the output which it displays