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BQ35100: Need write twice control command to work?

daniel
Genius 5095 points
Part Number: BQ35100
Other Parts Discussed in Thread: BQSTUDIO

Hi team,

I face a strange symptom: Need write twice control command to work?

I use stop gauge command, but need twice to show on control status.

Please help to confirm.

Thanks

  • 0
    TI__Guru* 76230 points
    are you sending the commands back to back without delays? how are you sending the commands? Are you using Bqstudio or your host controller?

    -Onyx
  • 0
    TI__Genius 10370 points

    Daniel,

    Please go into more detail on this issue you are seeing. I have tested locally here (log attached) and only issuing the command once is needed.

    Fullscreen Gauge_Stop.log Download 
    Advanced Comm Transaction Log

TimeStamp , Read/Write , Address , Register , Length , Data , 
2017-08-01 03:06:23 231 , Rd , AA , 00 , 2 , 80 20 
2017-08-01 03:06:24 762 , Wr , AA , 00 , 2 , 11 00
2017-08-01 03:06:26 289 , Rd , AA , 00 , 2 , 81 20 
2017-08-01 03:06:31 687 , Wr , AA , 00 , 2 , 12 00
2017-08-01 03:06:33 589 , Rd , AA , 00 , 2 , C0 20

    Thanks,

    Eric Vos

  • 0 in reply to Onyx Ahiakwo
    Genius 5095 points
    Dear Onyx,

    I add some delay after each write-operation, then issue is fixed. Currently, I use 800ms.
    Do you have detail about delay to read/write command? We want to know the minimum delay time requirement.

    Thanks
  • 0 in reply to daniel
    Expert 2475 points

    TI has recommended that you should not attempt to send reads more often than every 22ms and writes more often than 66ms for Block Read/Write. You may want to add a few more milliseconds for margin to see whether this helps. 

  • 0 in reply to TEC
    Genius 5095 points
    Dear TEC,

    Many thanks