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Visitor II
February 14, 2019
Question

Is there any sequence that should be done before reading the registers value on LIS3DHH accelerometer?

  • February 14, 2019
  • 3 replies
  • 1070 views

Hello,

I try run accelerometer LIS3DHH on Nucleo F411RE. I want check register WHO_AM_I value. I set address on 0x8F (0x0F address register and 0x10 value as set accelerometer to read data from register.) I always receive value 0x00 from register. I run example from STMicroelectronics driver from github service.

Is there any sequence that should be done before reading the registers?

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    3 replies

    Visitor II
    February 14, 2019

    Have you checked the signals ?

    Is /CS pulled low during transfer attempts ?

    PForn.15Author
    Visitor II
    February 14, 2019

    Yes. I checked the signals. CS signal is OK. I attach a picture from the signal analyzer.

    0690X000006DbufQAC.png

    Visitor II
    February 14, 2019

    Is the SPI interface setup correctly (clock polarity, edge) ?

    The datasheet says:

    These lines are driven at the falling edge of SPC and should be captured at the rising edge of SPC.

    The datasheet (sect. 4.2) shows a 16-bit transfer. And says:

    Both the read register and write register commands are completed in 16 clock pulses or in multiples of 8 in case of multiple read/write bytes.