Example FXOS8700CQ Driver Code in Datasheet gives 0,0,256 for magnetometer x,y,z values

peter_macleod_t — Tue, 03 Feb 2026 22:05:20 GMT

The FXOS8700 is connected to Beaglebone Black via i2c. The example code from the Datasheet is copied - print statements were added. The accelerometer data seems fine but the magnetometer data is consistently 0,0,256.

The magnetometer control register 2, FXOS8700CQ_M_CTRL_REG2, is being set to 0x20 for a burst read but it does not seem to work.

Not sure if this is being posted in the correct location....#

Peter

Re: Example FXOS8700CQ Driver Code in Datasheet gives 0,0,256 for magnetometer x,y,z values

TomasVaverka — Thu, 18 Apr 2019 08:01:27 GMT

Hi Peter,

First off, please double check if m_hms[1:0] = 0b11 (hybrid mode).

Then I would recommend to check what is going on the bus using an oscilloscope or a logic analyzer. I have used a burst read in my example without any problems.

Best regards,

Tomas

SensorsのトピックRe: Example FXOS8700CQ Driver Code in Datasheet gives 0,0,256 for magnetometer x,y,z values

Example FXOS8700CQ Driver Code in Datasheet gives 0,0,256 for magnetometer x,y,z values

Re: Example FXOS8700CQ Driver Code in Datasheet gives 0,0,256 for magnetometer x,y,z values