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CCS: Hardware

Rodrigo Felipe Nina
Prodigy 10 points
Other Parts Discussed in Thread: TM4C123GH6PM

Tool/software: Code Composer Studio

I recently bought a Tiva launchpad tm4c123gh6pm, I was playing with the pins, for example I was using a wire to turn on the leds but something happened and now the blue led is turn on and nothing can turn off it, I thought that the reset button would solve my problem but nothing. Maybe I used a wrong pin. I would appreciate if someone could help me.

  • 0
    Guru 117855 points
    It would prove helpful if we were told, "What was connected to that "wire" which you used to "turn on" the Leds." We must assume that your wire was connected to +5V, or possibly to circuit ground.

    If your wire was tied to +5V - and then while "touching different pins" - you touched the pin that was routed to the blue Led - it is likely that the MCU pin has been damaged.

    If that's the case - that (SINGLE) MCU pin has probably been lost. You may carefully slice the pcb "trace" between that MCU pin and the blue Led (or current limiting resistor) and (then) wire the blue Led into another MCU GPIO pin - which has (not yet) felt the "sting" of your "wire!"
  • 0
    Guru 13040 points

    Rodrigo,

    Are you even controlling the pin with your MCU? Do you have a valid software running?

    Erase your MCU. Create a software, configure all pins to input. Measure the trace and check if it is still high - which would suggest a short.

    Configure this particular pin to output and try to toggle it and see if turns on/off. If you can't, then as cb1 said, your pin is gone. Likely, other pins on the same port are gone as well - time to buy a new launchpad, and save this as a spare programming ICDI interface.

    Regards

    Bruno