Jeff, is there any reason why you need to use python ? Because this should be really easy ( under 20 lines of code ) to get the PWM set, and running in C. Through using Linux sysfs
On Sat, Feb 20, 2016 at 6:49 PM, Jeff Pedlow <[email protected]> wrote: > Hello again, > > As an addendum -- I tried installing the greycat labs bbio via apt-get. > Sadly, every time that I try importing it via python, i get an immediate > seg fault. > > cannot for the life of me figure out how to make PWM work. It's > frustrating as someone who really wants to learn the platform but isn't a > linux ninja :\ > > Banging my head on the wall :( > > Any and all input is appreciated > > - > > On Sat, Feb 20, 2016 at 4:53 PM, Jeff Pedlow <[email protected]> wrote: > >> Hello Robert, >> >> Thank you very kindly for getting back to me. >> >> To clarify, do you mean I should install the greycatlabs bbio package? >> and its compatible with 4.1? :) >> >> Reading: >> https://github.com/graycatlabs/PyBBIO/wiki/Installing-PyBBIO >> >> it appears that it is not compatible with anything higher than 3.8? >> >> >> Tried a couple things without much success: >> >> Wanted to see if it was installed from the getgo (as the adafruit library >> was) First tried: >> >>from bbio import * # >> https://github.com/graycatlabs/PyBBIO/wiki/Using-PyBBIO >> >> And got a seg fault >> Then further tried to see if the module was actually installed via: >> >>help('modules') >> and >> pydoc modules >> >> and both seg faulted. >> >> I apologize for being 'a little slow' on this front. >> >> Thanks kindly! :) >> >> On Sat, Feb 20, 2016 at 2:08 PM, Robert Nelson <[email protected]> >> wrote: >> >>> >>> On Feb 20, 2016 3:54 PM, "Jeff Pedlow" <[email protected]> wrote: >>> > >>> > Hi Robert, >>> > >>> > Thank you VERY kindly for getting back to me. I am a little new to >>> linux, but am trying to learn as I go here, so apologies if I'm not >>> answering very well. >>> > >>> > OS: >>> > EMMC flash image: >>> https://rcn-ee.com/rootfs/2016-02-11/flasher/BBB-eMMC-flasher-debian-8.3-console-armhf-2016-02-11-2gb.img.xz >>> > SD image: >>> https://debian.beagleboard.org/images/bone-debian-8.3-lxqt-4gb-armhf-2016-01-24-4gb.img.xz >>> > >>> > >>> > Using the stock installed python and adafruit python bbio library >>> included on the SD image. >>> > >>> > First step was to see if I could make a PIN go hi/low to flash an LED >>> using python (simple enough) >>> > import Adafruit_BBIO.GPIO as GPIO >>> > GPIO.setup("P8_10", GPIO.OUT) >>> > GPIO.output("P8_10", GPIO.HIGH) >>> > GPIO.output("P8_10", GPIO.LOW) >>> > >>> > And the LED hooked to P8_10 works and I can make it blink. Life is >>> good. Huzzah! >>> > >>> > >>> > >>> > Next step.. was to TRY to run this in python: (from the adafruit bbb >>> servo tutorial) >>> > import Adafruit_BBIO.PWM as PWM >>> > PWM.start("P8_13", 95.0, 60) >>> > PWM.set_duty_cycle("P8_13", 97.0) #This Errors with: "IOError: [Errno >>> 2] No such file or directory: '/slots'" >>> > PWM.stop("P8_13") >>> > PWM.cleanup() #This Errors with: "IOError: [Errno 2] No such file or >>> directory: '/slots'" >>> >>> There's a patch for this but it breaks, 3.8.. >>> >>> For now us pybbio lib. >>> >>> > >>> > And nothing happens. >>> > >>> > From this point I've become successful at horribly confusing myself >>> about listings in /sys/class and /lib/firmware and .dtbo files and >>> /sys/devices/platform/bone_capemgr/slots and have NO idea where to go to >>> get PWM to work in python, let alone how to successfully troubleshoot the >>> issue. >>> > >>> > Any and all input appreciated. Really humbling experience thus far. >>> > >>> > Thanks >>> > >>> > -Jeff >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > On Sat, Feb 20, 2016 at 1:35 PM, Robert Nelson < >>> [email protected]> wrote: >>> >> >>> >> >>> >> On Feb 20, 2016 2:47 PM, <[email protected]> wrote: >>> >> > >>> >> > Hi There, >>> >> > >>> >> > Im trying to get a basic servo project running on my BBB >>> >> > >>> >> > I had installed Debian 8.3 (the image provided on the beaglebone >>> page, running the 4.1 kernel) kernel on it and tried to get PWM working >>> without success (apparently both the adafruit and greycat python bbio >>> libraries only work on 3.8), interestingly enough bonescript also refuses >>> to work. >>> >> > >>> >> > >>> >> > I have tried reverting to earlier images via microsd without >>> success: >>> >> > -The Device doesnt become reachable via ping to 192.168.7.2 after >>> several hours and attempting to power cycle >>> >> > -The "External Drive" does not connect to windows upon boot >>> >> > -While attempting to flash the emmc, the USRleds do not cycle in >>> the 'cylon' style. >>> >> > >>> >> > I've tried to make the Debian 8.3 image work, via trying to install >>> an older kernel via apt without success (the device appears to be operating >>> but is unreachable via USB/ping/etc): >>> >> > "sudo apt-get install linux-image-3.8.13-bone70 >>> linux-headers-3.8.13-bone70 mt7601u-modules-3.8.13-bone70" >>> >> > >>> >> > >>> >> > I really DON'T know what to do -- I would have hoped that PWM would >>> work out of the box on the default Debian 8.3 image. Perhaps there's >>> something I need to do to make it work that isn't apparent to a novice like >>> me. >>> >> > >>> >> > Unfortunately, rolling back to a 3.8 kernel via imaging or apt >>> doesn't seem to allow the BBB to communicate with my windows machine after >>> attempting to do so, and only 4.1 kernel images seem to work successfully >>> in that sense, with the caveat that PWM doesnt work. >>> >> >>> >> PWM, should be working on v4.1, what software stack are you using to >>> interface to the pwm's? >>> >> >>> >> Regards, >>> > >>> > >>> >> >> > -- > 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 [email protected]. > 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. 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