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RTC

Mary Ann Austin
Prodigy 20 points
Other Parts Discussed in Thread: TM4C1294NCPDT

Hi,

I have purchased 4 Tiva tm4c1294ncpdt controllers and have designed a system such that it updates its RTC time from the server and goes to hibernation and wakes up at a future time configured on the server. All the boards are designed with same software and hardware. All the boards except one is working as intended. The faulty board does not go to hibernation but resets itself and then goes to hibernation and never wakes up at all. I doubt if RTC is the issue because all other functionalities are working fine except hibernation and wake up. 

If RTC is faulty, then what is the solution to get it rectified. Can it be resolved through software?

Thanks,

Mary

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

    1. How do you know it has entered Hibernate Mode. Does the HIBn signal on the IO go low?
    2. Did you check if the 32K Oscillator is working correctly? Scope, register check?

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Prodigy 20 points

    Hi Amit,

    Thanks for your suggestions. I had confirmed regarding the hibernation with the HIBn signal. For the oscillator, I 'll check and let you know. 

    Regards,

    Mary

  • 0
    Guru 47900 points

    Mary Ann Austin said:
    All the boards - except one...work as intended.

    As always - I'd doubt the "user/user's system" long before I looked to this vendor.

    Unstated is how each board is powered - what interconnects (if any) appear upon each board - and just how the "server" wakes each board.

    May I suggest that you "swap" a working board w/the "errant" one - and repeat your test.   Should the issue remain w/the errant board - that board has some issue.   Yet - if the issue is "location" sensitive - the power and/or interconnect and/or "wakening mechanism" (instead) seems suspect.

  • 0 in reply to Mary Ann Austin
    TI__Guru**** 244400 points
    Hello Mary

    Also do check the Reset Cause register in System Control module.

    As the next step check
    1. With a simplified code if hibernate is an issue on the failing board?
    2. Share the code if possible.

    Regards
    Amit