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Unable to get output on Terminal when using example code for UART on dk-tm4c123g with CCS

Monil M
Prodigy 50 points
Hello, I've tried to run example codes for UART bundled with the Tiva C series development kit for dk-tm4c123g. The code builds without errors on CCS v6. According to the code, "Enter Text:" should appear on the Terminal, but on the Terminal there is NO OUTPUT. I verified the COM port was correct & the settings for the serial connection were also default. I even tried with Putty to no avail. I even tried the UART I/O polled code example that just echos the input of UART, but obtained same results: no output at all. Another thread where the person got his solution simply by changing the jumper positions on his Launchpad(my board is different) : e2e.ti.com/.../1307850 Board: dk-tm4c123g Compiler tool: CCS v6 The example code(s) can be found in C:/ti/TivaWare_C_Series-*/examples. Thanks Monil
  • 0
    TI__Guru**** 244400 points
    Hello Monil,

    Can you check that the device manager on the PC is showing a ICDI device when you connect the board?

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Prodigy 50 points
    Hello Amit,
    Yes in the Device Manager window I'm able to see ICDI device. Also the properties suggest that the drivers are working properly.

    Regards.
  • 0 in reply to Monil M
    TI__Guru**** 244400 points
    Hello Monil,

    So, we do not see an issue for the device being enumerated. The next set of checks

    1. Can you check that the UART COM Port is being displayed in the device manager?
    2. Can you check the date of the driver as shown by property when you right click the ICDI?
    3. Did you check the PA0 and PA1 pins on the DK-TM4C123G toggling when sending and receive data?

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Prodigy 50 points

    Hello Amit,

    1.The COM port shows as Stellaris Virtual Serial Port(COM14). 

    2. The Stellaris ICDI driver date displays as 03-08-2012.

    3. The PA0 PA1 pins show no change in voltage when I enter keys on PC, measured it with multimeter, even though the ICDI LED blinks.

    Also when I tested the uart_polled example on another PC it throws unrecognised characters onto the terminal. Im attaching the screenshot for the above mentioned conditions.

     

  • 0 in reply to Monil M
    TI__Guru**** 244400 points
    Hello Monil

    the baud rate is 115200 bps in 8N1 format. Please check the device manager setting and the application on PC setting for the correct baud rate.

    Regards
    Amit