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Problem with Tiva C TM4C1294NCPDT lauchpad

Bùi Thiên Ân
Prodigy 200 points
Other Parts Discussed in Thread: TM4C1294NCPDT

Hi everybody, I'm studying about Microcontrollers Tiva C ( TM4C1294NCPDT), and now I'm having a problem with TM4C1294NCPDT, please help me:

When I connect TM4C1294NCPDT lauchpad  with USB Port on Laptop, the Led Power it light on as usual, but today, it does not light continuously on. I don’t know why it happened. Who knows the problem, please help me.

Contact me at: thienan2050@gmail.com

 

  • 0
    TI__Guru**** 244400 points
    Hello An,

    Easy: Use a multimeter to check if the 5V from USB is coming to the board and the 3.3V is being generated by the on board LDO. If it is then connect the debugger and download the program as the next check and it could be failing LED. If not then the LDO may have been damaged and the 3.3V is not being generated

    Regards
    Amit
  • 0
    Guru 117855 points

    an bui said:
    Who knows the problem

    You do - the power Led does not light continuously.

    Might better questions be: "What (likely) caused this problem AND how may it be fixed?

    The only clue you provide is the "regularity of the power Led's lighting."   If that Led connects to the MCU's 3V3 power rail - and it too is varying - you may have a bad connection, an over-stressed regulator or bad USB cable.

    • Visually inspect the USB connector on your board.   Have any of the smt pins separated from the board?  Does the connector display any movement?
    • Replace the cable between PC and your board with "known good" one.
    • Have you powered other circuitry from your board?  If so - has that been recent?   And - if other circuitry connects to your board - have you (again) tested after removing all external circuits & connections?   (such may be loading down your 3V3 regulator and/or may have damaged it.
    • Have you made recent code changes which may cause the MCU to run too fast - or cause MCU port or bus contention?

    Adequate "detail" as always - proves your best means to "help yourself."