BNO055 Register Write Fails Silently

[juicy]

Hello,

I'm using the BNO055 with a RPi 3B+ over I2C. I can read any sort of value I'd like - power mode, operating mode, calib status, etc. but whenever I try to write a value to the sensor nothing changes. I'm using the official C lib here on github: https://github.com/BoschSensortec/BNO055_driver

After initializing the sensor, I am left in the "suspend" power mode and I have 0x0d as my operating mode, something that clearly is off.

I'd really appreciate any help here, as I don't have much more of a clue what I should be looking into.

I'm using the C lib on github: https://github.com/BoschSensortec/BNO055_driver

Here's the wiring setup I have with the pi:
 

[Vincent]

For BNO055,  any register write / register value change can only happen in Configure mode.  this means the operation_mode register should be with value 0x10.  

From your description,  you are under NDoF mode,  then the register write is be ignored by sensor.  

[juicy]

Hi Vincent, thanks for the quick reply.

After looking at someone else's question on using I2C to talk with a sensor, I've finally got my reads and writes working. This required rewriting the "BNO055_I2C_bus_write" and "BNO055_I2C_bus_read" functions.

Could it be made more clear in the repo that these methods are not complete? Would have been appreciated and saved me a lot of time.

[Vincent]

Yes, i will take your suggestion to the engineer team. 

Avtually we put following comment in our API on Github

bno055_support.c

• This file shall be used as an user guidance, here you can find samples of * Initialize the sensor with I2C communication - Add your code to the I2C bus read and bus write functions. - Return value can be chosen by yourself - API just passes that value to your application code - Add your code to the delay function - Change I2C address accordingly in bno055.h