It looks like the MPU9250 has a non standard (to my way of thinking) I2C read sequence that requires you to resend the register address as part of a consolidated write/read sequence. The default tool i2cget does not deal with this, and only deals with simple (standard to my way of thinking) read sequences.
Since you can write to the device, and a write requires an acknowledgement from the device, there is nothing wrong down at the hardware and low-level driver level. If you get a driver specific to the MPU9250 running, that understands the required byte control sequence, I would expect it to work. If you are using Python, I would suggest using Python 2.7 rather than Python 3. At least to get started, until you are in control. The last time I did Python control of I2C, you needed to load python-smbus, and it had not yet been updated for Python 3 compatibility. It may have been updated and re-released in the last six months. I did find instructions on the web about how to manually recompile python-smbus for Python 3, so it is possible. --- Graham == On Fri, May 12, 2017 at 9:41 AM, 'Torsten K.' via BeagleBoard < beagleboard@googlegroups.com> wrote: > Update: I lowered the clock frequency of i2c1 to 100kHz via the dtb. That > also doesn't change the behaviour. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/beagleboard/-cVwfP40L0M/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/5b4d695c-e108-4f7e-a154-8c7e81bf8b41%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/5b4d695c-e108-4f7e-a154-8c7e81bf8b41%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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/CANN_KV7PVfz-2OakcWRqd%2BJ8vyNQus%2BS99YXj%3De7DPqG7%2BBoAA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
