BM270: Gyroscope Data Post-Processing

[_Richard_]

The BMI270 datasheet rev1.0.05 2019 on page 32 (ref https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMI270-DS000.pdf ) details Gyroscope Data Post-Processing that should be applied to the X axis with this formula:

RateX = ValueX – GyrCas * ValueZ / 512

In the chips I’ve tried GyrCas is always 0, meaning this formula is redundant. GyrCas being feature register 0x3C on features page 0.

So have I done something wrong when reading GyrCas, or is there some calibration sequence I need to perform to get GyrCas set to something other than zero? The datasheet says the reset value is 0, so does this ever change?

Thanks!

[kgoveas · Accepted solution]

Hi  _Richard_,

Have you already loaded the configuration file in to the BMI270? If so, how long do you wait before you read out the GYR_CAS value?

Regards,
kgoveas

[_Richard_]

Thanks kgoveas!

Sending the configuration file and waiting for init complete before attempting to read GyrCas fixed the problem.  Now I see GyrCas = 3 in my test chip 🙂