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Single-Board Computers
Forum PiFace Shim RTC Clock Registers
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  • shim-rtc
  • rtc
  • realtime
Related

PiFace Shim RTC Clock Registers

Former Member
Former Member over 9 years ago

I seem to have gotten my RTC in a corrupted state and I am unsure of how to recover it.

 

This is the error thrown every time I try and read from hwclock.

 

hwclock: The Hardware Clock registers contain values that are either invalid (e.g. 50th day of month) or beyond the range we can handle (e.g. Year 2095).

 

I was following the advice from this thread.

https://www.element14.com/community/message/138883/l/piface-shim-rtc-not-recognised-on-a-rpi-b#138883

 

I got my Pi to recognize the RTC and it worked, but after one reboot it seems to be in a corrupted state.

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  • shabaz
    0 shabaz over 9 years ago

    Hi David,

     

    It may well not be making very good contact, which would cause corrupted data to be read, but would possibly not cause an error on write.

    Can you visually confirm that all the relevant header pins appear to be making reasonably firm contact with their mating hole inner circumference?

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  • clem57
    0 clem57 over 9 years ago

    After checking hw like shabazsuggested, redo software step be step to fix this.

    Clem

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  • Former Member
    0 Former Member over 9 years ago in reply to shabaz

    I re-seated and tried to run through the software install a couple of times to no avail. I still have to manually "echo mcp7941x 0x6f > /sys/class/i2c-adapter/i2c-1/new_device" before it will even be recognized by the Pi. Here is an image of how it is currently seated Link.

     

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  • clem57
    0 clem57 over 9 years ago in reply to Former Member

    It looks like no soldering on the joints! Therefore no electrical contacts. Please solder them.

    Clem

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  • Former Member
    0 Former Member over 9 years ago in reply to clem57

    I was under the impression that this shim would not need to be soldered.

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