Thanks for following up. I've been using the tieqep module to read absolute position count of a rotary encoder knob. I'm curious what other use cases people have for eQEP?
The reason I ask is I think a new driver needs to be written and it would be good to know which features of the eQEP peripheral should be implemented. The existing tieqep driver is out of tree and seems unlikely to be included in the mainline Linux kernel. We are able to use it on BeagleBone because Robert includes it as a patch in his kernel builds. The IIO subsystem now has infrastructure for encoders. I am thinking that an IIO driver should be written for eQEP with the goal of being merged into the mainline kernel. Thoughts? -Drew On Feb 24, 2017 3:39 AM, "Hugh Frater" <hugh.fra...@gmail.com> wrote: I was getting weird values - it turns out I didn't correctly understand how to use pin-config & the universal overlay. When I configured the pins correctly, everything works. On Friday, 3 February 2017 21:18:35 UTC, Drew Fustini wrote: > On Fri, Feb 3, 2017 at 6:02 AM, Hugh Frater <hugh....@gmail.com> wrote: > > Did you ever get any further with this? I'm struggling with eQEP on > 4.4.36 - > > but for different reasons > > Are you getting an error? > > I am able to use eQEP ok with a rotary encoder on 4.4 kernel: > > # uname -a > Linux beaglebone 4.4.44-ti-r85 #1 SMP Fri Jan 27 22:16:52 > > # config-pin p8.11 qep > # config-pin p8.12 qep > > # cat /sys/devices/platform/ocp/48304000.epwmss/48304180.eqep/position > -2 > <turn the rotary encoder> > # cat /sys/devices/platform/ocp/48304000.epwmss/48304180.eqep/position > 18 > > Here are results with 4.1, 4.4 and 4.9: > https://gist.github.com/pdp7/1db356e758e9ff0c1e570e6ee362c673 > > > -drew > -- 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/1276f9da-9966-4171-a03c-4915d94e8e6b%40googlegroups.com <https://groups.google.com/d/msgid/beagleboard/1276f9da-9966-4171-a03c-4915d94e8e6b%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/CAEf4M_ALLyTM18zH_wkB6gYH0k7XL%2Bw_amzLMsCjYTvaws6kPA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
