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BQ32000: RTC does not get initialized in the firmware properly in the first boot.

Romir Patney
Prodigy 40 points
Part Number: BQ32000

If RTC battery is taken out and put back in. The RTC does not get initialized properly for the first boot up.
Similarly, on fresh new boards when RTC is on and never been initialized before we receive this error as well.

We receive the following error:

[   16.116866] bq32k 2-0068: Oscillator Failure. Check RTC battery. 

[   16.124277] bq32k 2-0068: registered as rtc0 

[   16.129645] bq32k 2-0068: hctosys: unable to read the hardware clock


Please advice on this issue.



Best Regards,
Romir

  • 0
    TI__Genius 9250 points

    Hi Romir,

    A subject matter expert will get back to you by tomorrow on this. 

    Best,

    Asim

  • 0
    TI__Prodigy 720 points

    Hi Gunter,

    For [   16.116866] bq32k 2-0068: Oscillator Failure. Check RTC battery.

    Can you verify if the OF flag bit is being cleared after the first power up? It is expected behavior for the OF flag to be set on initial power up and chug out this error. It is on the second power up that the OF flag bit should be cleared when you initialize the RTC (setting the time). You can then monitor the bit in case there is an oscillator fail event during operation. See page 13 on BQ32000 datasheet for more information. 

    What does your design look like? If you have external tuning capacitors for the crystal, that may be the issue.

    As for being unable to read the hardware clock, I'll have to look into it. 

    Regards,

    Juan

  • 0 in reply to Juan Rodriguez
    Prodigy 40 points

    So can we or can we not read the clock after the first power up? We can only not read in the first power up when bit has just been cleared. 

  • 0 in reply to Romir Patney
    TI__Prodigy 720 points

    Hi Romir, 

    Lets confirm that I2C communication works. Are you able to reprogram the registers to set the time, and read back the time? 

    It may also help to check the battery voltage before powering the system on to confirm that it is within the recommended range. 

  • 0 in reply to Juan Rodriguez
    Prodigy 40 points

    We use a standard linux utility hwclock to update the time (which communicates with the RTC over the i2c bus.) Once the RTC is properly initialized i.e. on the second power up we can configure the time and read it back. 

    As for the voltage I will get back to you after probing the voltage/ discussion with our HW team.

  • 0 in reply to Juan Rodriguez
    Prodigy 40 points

    It may take a while before we're able to confirm the voltage. Why would voltage be an issue only on the first boot? The voltage is identical on every boot up.

  • 0 in reply to Romir Patney
    TI__Prodigy 720 points

    Romir, voltage shouldn't be an issue on first boot. I realize now that the RTC is working for you after first boot therefore your voltage should be ok. When you go through full power on cycling (no vcc, no vvback) there will be no clock data stored. If the part has no default setting after power up, the data you'll see is random bits.