error when trying to monitor gpio events with `gpiomon gpiochip0 40` - `error waiting for events: No such device`

[Krasi Georgiev]

trying to monitor a button press on GPIO19 which has an offset 40, but getting the error in the title.

Switched between kernels but made no difference.

 

 

http://ix.io/4cFr

 

After switching the kernel

http://ix.io/4cGd

Not sure if this is related, but might help with the troubleshooting

https://archlinuxarm.org/forum/viewtopic.php?f=65&t=14423

[Krasi Georgiev]

another possible solution
https://forum.odroid.com/viewtopic.php?t=40322

[Igor]

You have checked this https://linux-sunxi.org/GPIO ?

[Krasi Georgiev]

Just checked the info there, but don't see how is this helpful with the issue I mentioned?
`gpiomon gpiochip0 40`  returns an error `error waiting for events: No such device` and I think that this is due to some issue with the kernel.
 

[Igor]

This is my situation, but i am using gpios for driving relays with this simple script:
 

Spoiler

#!/bin/bash
task(){
	gp=$1
        [[ ! -d /sys/class/gpio/gpio${gp} ]] && echo ${gp} > /sys/class/gpio/export
        echo "out" > /sys/class/gpio/gpio${gp}/direction
        echo "0" > /sys/class/gpio/gpio${gp}/value
        sleep 10
        echo "1" > /sys/class/gpio/gpio${gp}/value

}

task "$1"

 

 

ls -l /sys/class/gpio 
total 0
--w------- 1 root root 4096 Jan  1  1970 export
lrwxrwxrwx 1 root root    0 Jan  1  1970 gpiochip0 -> ../../devices/platform/soc/1c20800.pinctrl/gpio/gpiochip0
lrwxrwxrwx 1 root root    0 Jan  1  1970 gpiochip352 -> ../../devices/platform/soc/1f02c00.pinctrl/gpio/gpiochip352
lrwxrwxrwx 1 root root    0 Oct 20 11:22 gpiochip412 -> ../../devices/platform/soc/1c1c000.usb/usb2/2-1/2-1.4/2-1.4.4/2-1.4.4.1/2-1.4.4.1:1.0/gpio/gpiochip412
--w------- 1 root root 4096 Jan  1  1970 unexport

 

If this can help you in some way ...