09-09-2021, 08:42 PM
Thanks so much for this tool. I was wondering what was happening with the magnetometer and found this thread. 
I was tracking down a problem with GeoClue and the heading always pointing North and wanted to figure out the source of the problem. It appears that other sensors such as the Intel Sensor Hub are able to provide directly the angle to magnetic north and provide that as an IIO attribute in_rot_from_north_magnetic_tilt. I suppose that those sensors have some form of internal calibration either in hardware or in their kernel driver.
I'm wondering if there might be a way to push some of the logic for this app into iio-sensor-proxy, which might be applicable to to a wide variety of sensors. The question is what to do about the calibration. Perhaps it can be read from a configuration file that is generated with a helper app or maybe there is some way to auto-calibrate as the phone moves around enough.
I was tracking down a problem with GeoClue and the heading always pointing North and wanted to figure out the source of the problem. It appears that other sensors such as the Intel Sensor Hub are able to provide directly the angle to magnetic north and provide that as an IIO attribute in_rot_from_north_magnetic_tilt. I suppose that those sensors have some form of internal calibration either in hardware or in their kernel driver.
I'm wondering if there might be a way to push some of the logic for this app into iio-sensor-proxy, which might be applicable to to a wide variety of sensors. The question is what to do about the calibration. Perhaps it can be read from a configuration file that is generated with a helper app or maybe there is some way to auto-calibrate as the phone moves around enough.