Same issue here. Raw readings seem to be correct, but the DMP mode of the API the heading (raw and filtered) just drift.
On Saturday, October 14, 2017 at 12:29:44 PM UTC-4, Pierce Nichols wrote: > > Hi all, > > I already posted this to the Beaglebone group, but I noticed there's > lots of traffic here about the Beaglebone Blue as well, so I'm cross > posting in hopes of finding an answer. > > I'm having trouble getting the compass heading to work correctly in > DMP mode on my Beaglebone Blue. I'm running with the default > roboticscape overlay. > > -- I calibrated the magnetometer and gyroscope as directed here: > http://www.strawsondesign.com/#!manual-imu > > -- I ran the rc_test_imu program and confirmed that the magnetometer > is working correctly. > > -- I ran rc_test_dmp -m -c -t. When I did this, I noticed that the raw > compass was stuck near either 0, +180, or -180 degrees, jumping > between those points as I rotated the Blue around the Z axis. When > left still, the filtered compass always converged to the value of the > raw. I also tested to make sure the pitch and roll angles were sane, > and they were. > > I tried rotating it around the X and Y axes as well as using the -o > option to switch the IMU orientation. This did not materially change > the compass behavior. Trying it without the -m or -c switches produced > no change in behavior. > > It behaves as if the magnetometer was simply not being turned on in > DMP mode. I double-checked the source code of rc_test_dmp and > recompiled it to see if the bug was there, and got the same results. > > Any suggestions for what I can try next? My application is such I can > get away with processing the raw values to get a compass heading, but > it would be nice to be able to use the sensor fusion. I filed a github > issue as well. > > -- > Pierce Nichols > Principal Engineer > Logos Electromechanical, LLC > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/10e7b1a1-4014-406e-aa0f-5c74cf3b6849%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
