GPIO library - WiringPi

apocalyps

when i compile RFSniffer with pin 16 (physical pin 40) then it falls back to gpio in sysfs mode. what pin did you use to test it?

apocalyps

Did some testing but on some pins it falls back to sysfs.

Edit:
@Werecatf
Tried your code but also got the following message

1. gpio: Unable to open GPIO export interface: No such file or directory
   
2. wiringPiISR: unable to open /sys/class/gpio/gpio199/value: No such file or directory

Copy code

EDIT:

Ok i had some things not correctly in my kernel.

StaLeWaR29

@apocalyps

What was the problem with the kernel?
I have the same problem

WereCatf

His kernel was not built with the GPIO sysfs-interface enabled, he had to enable the setting and re-build the kernel.

domcat

WereCatf, please can you give us some info on how rebuilt the kernel with sysfs interface enabled?

WereCatf

domcat replied at 2016-2-26 18:44
WereCatf, please can you give us some info on how rebuilt the kernel with sysfs interface enabled?

When doing menuconfig the appropriate setting can be found under Device Drivers -> GPIO Support -> sysfs interface, or use CONFIG_GPIO_SYSFS=y if manually editing .config.

If you meant you don't even know how to build a kernel in general: no, that's not something a beginner should be doing in the first place and I don't want to write such a long guide -- way too much work. Use an image where it's already enabled by default instead, like e.g. Armbian.

StaLeWaR29

@WereCatf
Thanks for the explanation!

You can tell which ports function works wiringPiISR.
I have seen the information that it only works on ports PA7, PA8, PA9, PPA10, PG6, PG8
example here https://github.com/ua3nbw/gpiokey/blob/master/wpi.c

WereCatf

All PA- and PG-pins should be able to work with interrupts, at least according to the H3 - specsheet.

StaLeWaR29

@WereCatf
Thanks you!

domcat

Ok thanks.