Opening GPIO errno 22

MortenRick

I try to setup a GPIO pin 26 on my Raspberry Pi 4 Rev1.5
But I get this error in the GPIO overwiew tab
"Opening GPIO: writing 'export': Invalid argument [errno 22]"
Server version 1.14.18

Repetier

Just tested this on our image and it worked. You might want to check if 22 is the correct number. On newer images this is not always the case. Run on linux console
cat /sys/kernel/debug/gpio
to see the numbers you need to use. Especially for pi 5 I know there is a difference. On bookworm with pi 4 I have it is identical to BCM numbering without offset.

Eventually it is an old error. Make a change and save and it might init then. the export file is where you write which pins you want to control. Are you on our image or an official pi image?

Henk

I have the same error setting up GPIO 17 as filament runout sensor. When signalcable is connected in Terminal>Show GPIO pins setting and state, it says: BCM-17, Name-GPIO17, Mode-IN and V-1. When signal is not connected V is 0. So i think its recognised? I tried a few other pins with the same error

Using a Raspberry Pi 3 Model B rev 1.2
Server version Pro 1.4.18

Hope you can help

Repetier

Might also depend on pullup/pulldown resistor defined. In server this is currently not settable you must do it in ssh terminal. If non eis set the input value is flating.

What do you use to view values? gpioreadall ? Wonder about the -1 level are normally 0 and 1

Henk

V-1 means V=1 🙂
When I make a new entry I get :oops connection lost. Then connection is re-established and lost again. And so on until I refresh the page. There is a new entry for each time the connection was lost. This happens whatever kind of GPIO operation I chose(setoutput, run g-code, ....). And when I configure the entry it results always in this error, with or without a sensor attached. Tried both pullup and pulldown in pinctrl with no effect.

Repetier

There is in deed a bug in setting the values that make server crash. Plus old 1.4.18 uses sysfs which does not allow defining pullup/down. I have during the weekend recreated the gpio solution so it now uses cdev allowing to set pullup/down actively. Also defining pins is easier as it shows pin names next to numbers. And best it does not crash any more. You can test it using 1.5 dev version. But be aware that upgrading is a one way ticket. It will change how g-codes are stored, so make a printer backup before upgrading in case you try this.