Op woensdag 13 juni 2018 15:58:25 CEST schreef Alexander Graf: > On 13.06.18 14:27, Freek de Kruijf wrote: > > I am using a Raspberry Pi 1B to count some pulses on one of the GPIO pins, > > using Python script. This script runs fine on an older version of > > Tumbleweed, namely 20160625. > > When I run my script on the current version, 20180502, it throws an error > > > > message: > > GPIO.add_event_detect(PIN, GPIO.FALLING, callback=cb, bouncetime=100) > > > > RuntimeError: Failed to add edge detection > > Try to find out who throws that error. Maybe just grep for the error > message in the python library directory. > > Another thing that may give hints is to run strace on your application > and see what it tries to access before and what doesn't work? > > > I found a message from Frank Kunz about using the pins via sysfs, of which > > I have the feeling this related. Maybe not! > > The solution that was mentioned was installing the pinmux driver. However > > I > > can't find such a thing. > > The in-kernel pinmux driver is =y, so no need to install or load anything: > > > https://kernel.opensuse.org/cgit/kernel-source/tree/config/armv6hl/default#n > 3208 > > > Alex
I used the strace and found that in fact the equivalent bash command: echo "4" > /sys/class/gpio/export gives the error message: -bash: echo: write error: Invalid argument This command should create new devices /sys/class/gpio/gpio4/* which one can use to change the behavior of the GPIO pins. What can be done to make this basic bash command work. Below some more information as root: # ls -l /sys/class/gpio/ total 0 --w------- 1 root root 4096 jun 14 17:41 export lrwxrwxrwx 1 root root 0 apr 23 09:40 gpiochip298 -> ../../devices/ platform/soc/20200000.gpio/gpio/gpiochip298 --w------- 1 root root 4096 jun 14 16:34 unexport -- fr.gr. member openSUSE Freek de Kruijf -- To unsubscribe, e-mail: opensuse-arm+unsubscr...@opensuse.org To contact the owner, e-mail: opensuse-arm+ow...@opensuse.org
