• State Not Answered
  • Replies 39 replies
  • Subscribers 78 subscribers
  • Views 4524 views
  • Users 0 members are here
Attachments (0)
Nordic Case Info
  • Case ID: 296987
Options

PPK2 reports implausible values & modifiers - how to recalibrate?

PurpleSequoia

Hello,

My PPK2 is reporting 2 zetta amperes power usage, and I found out that the "modifiers" appear really broken:

Calibrated: 0
R0: 3095044895830869060112875520.0000
R1: 0.0000
R2: 0.0000
R3: 0.0000
R4: 0.0000
GS0: 0.0000
GS1: 138.3582
GS2: 21.5994
GS3: 3.0130
GS4: 0.0876
GI0: 1.0000
GI1: 0.9614
GI2: 0.9534
GI3: 0.9415
GI4: 0.9521
O0: 0.0000
O1: -2814926129201152.0000
O2: 0.0000
O3: -2251799813685248.0000
O4: 0.0000
VDD: 3300
HW: 54350
mode: 2
S0: -0.000000009
S1: -0.000000064
S2: -0.000000512
S3: -0.000004891
S4: 0.002447326
I0: 0.000000044
I1: 0.000000364
I2: 0.000061116
I3: -0.000254856
I4: -0.007713722
UG0: 1.00
UG1: 1.00
UG2: 1.00
UG3: 1.00
UG4: 1.00
IA: 58
END

I have attempted to re-flash the ppk2 firmware, but that had no effect.

This affects both measurement modes, but in source mode the correct voltage is still output.

Intercepting the modifiers before they are parsed and replacing them with some from a different PPK2 again results in plausible measurements.

This may be related to accidentally writing a binary image intended for a different device onto the PPK2 serial port, assuming there are serial commands to configure those values which do not verify plausibility and do not have a checksum.

Is it possible to re-calibrate the device, or will it have to be replaced?

Parents
  • 0

    Hello  , it seems I have the same issue. My PPK2 measures 8Amps for an GSM Module!?!

    Can you help me find my calibration values? My board is:

    PCA63100

    1.0.1

    2023.05

    C7041CFB

    With the ppk2-eeprom tool I read:

    uart:~$ cal_read
     r0 (  0):  1008.333435059, 57 15 7c 44
     r1 (  4):   102.810317993, e2 9e cd 42
     r2 (  8):    10.511246681, 11 2e 28 41
     r3 ( 12):     0.991615474, 83 da 7d 3f
     r4 ( 16):     0.057274152, 4d 98 6a 3d
    gs0 ( 20):   -12.828792572, bc 42 4d c1
    gs1 ( 24):   172.304412842, ee 4d 2c 43
    gs2 ( 28):    27.249513626, 01 ff d9 41
    gs3 ( 32):     3.797163963, bc 04 73 40
    gs4 ( 36):     0.111408480, 21 2a e4 3d
     o0 ( 40):   175.197158813, 79 32 2f 43
     o1 ( 44):   122.197860718, 4e 65 f4 42
     o2 ( 48):   104.669311523, b0 56 d1 42
     o3 ( 52):    79.983360291, 7b f7 9f 42
     o4 ( 56):   140.348037720, 19 59 0c 43
     s0 ( 60):    -0.000000000, 93 02 20 98
     s1 ( 64):    -0.000000000, 93 02 20 a8
     s2 ( 68): -147579511720466450000.000000000, 3c 01 00 e1
     s3 ( 72): -2251812967022592.000000000, 31 00 00 d9
     s4 ( 76):     0.000000000, 12 00 00 01
     i0 ( 80):     0.000000000, 00 00 00 10
     i1 ( 84):     0.000000000, 00 00 00 01
     i2 ( 88):    -0.000000000, 00 00 00 80
     i3 ( 92): -792331720006293700000000000000.000000000, 97 02 20 f1
     i4 ( 96):     7.999999523, ff ff ff 40
    gi0 (100):     1.001492977, ec 30 80 3f
    gi1 (104):     0.952994883, 79 f7 73 3f
    gi2 (108):     0.942453086, 9b 44 71 3f
    gi3 (112):     0.927007437, 5c 50 6d 3f
    gi4 (116):     0.938278556, 06 33 70 3f
    ug0 (128):     1.000000000, 00 00 80 3f
    ug1 (132):     1.000000000, 00 00 80 3f
    ug2 (136):     1.000000000, 00 00 80 3f
    ug3 (140):     1.000000000, 00 00 80 3f
    ug4 (144):     1.000000000, 00 00 80 3f

    Thank you

  • 0 in reply to spirosbond

    What GSM module is this exactly? What operating voltages does it support, how are you supplying it and measuring it? I need more information from your side before reporting this internally, as these calibration values don't seem outlandish to me.

    Best regards,

    Simon

  • 0 in reply to spirosbond

    Hi

    Sorry for the late reply, I've been otherwise engaged the last few days, but I have now asked internally for access to the calibration data for your specific PPK2. I'll let you know as soon as I get them.

    Out of curiosity, what software have you used with the PPK2 to take these measurements? This doesn't seem like something our Power Profiler application would cause.

    Best regards,

    Simon

  • 0 in reply to spirosbond

    I got the calibration values almost straight away, here they are. Note that they're in a different format than what you get from the EEPROM tool used: 

    R: [1008.3334, 102.8103, 10.5112, 0.9916, 0.0573]
GS: [0.0, 172.3044, 27.2495, 3.7972, 0.1114]
o: [175.19716282894737, 122.19786235834067, 104.669313504667, 79.98335665332979, 140.34804167003148]
s: [-9.7e-08, -8.42e-07, -8.243e-06, -9.6815e-05, 0.001204936]
i: [2.78e-07, 2.242e-06, 9.8943e-05, -0.000108232, -0.005116542]
GI: [1.0, 0.953, 0.9425, 0.927, 0.9383]

    Best regards,

    Simon

  • 0 in reply to Simonr

    Thank you  ,

    After applying these values the measurements make much more sense :)

    Thanks for the help!

    About your question:

    "Out of curiosity, what software have you used with the PPK2 to take these measurements? This doesn't seem like something our Power Profiler application would cause."

    I have used Power Profiler (on Arch Linux) for connecting to the PPK2 and collecting all my measurements. 

    Best regards,

    Spiros

  • 0 in reply to spirosbond
    spirosbond said:
    I have used Power Profiler (on Arch Linux) for connecting to the PPK2 and collecting all my measurements. 

    I think that what Simon was meaning to ask was what application could have possibly sent down traffic to the PPK2 that messed up the calibration. For example I know in my case I know I pointed gdb "target extended-remote" to the PPK2 serial port by mistake, and I'm fairly confident that's what messed mine up.

  • 0 in reply to FabioFW

    Ah, thanks for the clarification! Honestly I think it was like this from the start. However if I could have caused this, it could only be by accidentally sending a (failed) "Upload" from Arduino IDE to the PPK2 port instead of my Adafruit Feather. I don't know if that happened and if it could cause the EEPROM values of the PPK2 to change.

Reply Children
Related
Terms of service