Hi sayalik! Your task gets very simple when you drop Adafruit library and use libpruio <http://github.com/dtjf/libpruio> instead. The code
#!/usr/bin/python ## \file # \brief Example: set 3 kHz timer on P8_08. # # This file contains an example on how to use libpruio to set a 3kHz # timer on pin 10 on header P8. # # Licence: GPLv3, Copyright 2019 by Thomas{dot)Freiherr( at ]gmx[dot}net from __future__ import print_function from libpruio import * ## The header pin to set PIN = P8_08 ## Create a ctypes pointer to the pruio structure io = pruio_new(PRUIO_DEF_ACTIVE, 4, 0x98, 0) try: ## The pointer dereferencing, using contents member IO = io.contents if IO.Errr: raise AssertionError("pruio_new failed (%s)" % IO.Errr) if pruio_tim_setValue(PIN, 1/3, 0, 0): # settimer output 3 kHz raise AssertionError("setting timer failed (%s)" % IO.Errr) if pruio_config(io, 1, 0x1FE, 0, 4): # upload settings, start IO mode raise AssertionError("config failed (%s)" % IO.Errr) ## IO mode is running, you should see 3 kHz timer output on P8_08 print("Press <Crtl>-C to stop") try: while True: except KeyboardInterrupt: print("") # clear terminal finally: pruio_destroy(io) It sets timer7 at 3 kHz until you stop by pressing <Crtl>-C. Then it restores the system to its original state. In order to run that code you'll have to install libpruio. Here's the command sequence for kernel 4.14 (it may differ for other kernels) echo deb http://beagle.tuks.nl/debian jessie/ > /etc/apt/sources.list.d/tuks.list echo deb-src http://beagle.tuks.nl/debian jessie/ >> /etc/apt/sources.list.d/tuks.list wget -qO - http://beagle.tuks.nl/debian/pubring.gpg | sudo apt-key add - apt-get update apt-get install python-pruio libpruio-klm libpruio-doc adduser <YourUserID> pruio rm /boot/dtbs/`uname -r`/am335x-boneblack-uboot-univ.dtb Execute all commands with root privilegues. (The last one kills the trigger file for cape-universal, instead rename it if you want to use ist later.) 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/88e552b3-734d-4759-af9b-a87f948b6a06%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.