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    BME688 some register can't write

    BME688 some register can't write

    xiaoheng
    Occasional Visitor

    I am user stm32G070 with spi  connect to bme688, and find the data not correct

    Sample, TimeStamp(ms), Temperature(deg C), Pressure(Pa), Humidity(%), Gas resistance(ohm), Status
    1, 46829, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    2, 49471, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    3, 52113, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    4, 54755, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    5, 57397, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    6, 60039, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    7, 62681, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    8, 65323, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    9, 67965, 106.39, -21015.71, 0.00, 82643128.00, 0x80
    10, 70607, 106.39, -21015.71, 0.00, 82643128.00, 0x80

    then  run the self test check code, and got fail result:

    API name [bme68x_selftest_check] Error [-5] : Self test error
    Self-test failed

     and I found that data[0].idac == 0, it mean that no heater,

    so write the reg 0x5A for a value , and then read it out, the register 0x5A is still 0x00

    xiaoheng_0-1664183670129.png

    the timing waveform is correct, so what can I do?

     

    1 REPLY 1

    BSTRobin
    Community Moderator
    Community Moderator

    Hi xiaoheng,

    The printf log of your "Temperature(deg C), Pressure(Pa), Humidity(%), Gas resistance(ohm), Status" were not correct.
    You could refer attached example code which run on STM32F4, and check whether your migrated BME688 sensor API(https://github.com/BoschSensortec/BME68x-Sensor-API) to your platform successfully?

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