对 GPIO 的 WiringPi 非 root 访问

Question

From this I though acess to GPIO for non-root users would be possible using wiringPiSetupSys() but I failed trying that.

Actually, if I do setuid on the executable then it works. So, wiringPiSetupSys() isn't enought?

$ ./gpio write 4 1  // This don't work :(
# chown root gpioapp
# chmod u+x gpioapp
$ ./gpio write 4 1  // This works :)

Answer 1

According to the GPIO utility documentation , the gpio utility is designed to be installed as setuid. Once that has been used to export the pins (as is required by wiringPiSetupSys ), you can call wiringPiSetupSys as a non-root user (see http://wiringpi.com/reference/setup/ ).

Answer 2

Is your non-root user a member of the gpio group? – Ben Voigt

Yeah, that's the point! It wasn't, just changed ( usermod -a -G gpio myuser ) and now it's working. – KcFnMi