gpio permission failing

tinashe

can someone please assist me

i am using emteria.os 0.71 free version or demo
i using qt to do my android apps

in the ssh mode

rpi3:/ # ls -lh /sys/class/gpio/export
--w------- 1 root root 4.0K__bionic_open_tzdata_path: ANDROID_DATA not set!
__bionic_open_tzdata_path: ANDROID_ROOT not set!
2020-05-12 12:52 /sys/class/gpio/export

rpi3:/ # chmod u+rw /sys/class/gpio/export

rpi3:/ # ls -lh /sys/class/gpio/export
-rw------- 1 root root 4.0K__bionic_open_tzdata_path: ANDROID_DATA not set!
__bionic_open_tzdata_path: ANDROID_ROOT not set!
2020-05-12 12:58 /sys/class/gpio/export

still i can not get access to /sys/class/gpio/export
even /dev/gpiomem is the same thing
rpi3:/ # ls -lh /dev/gpiomem
__bionic_open_tzdata_path: ANDROID_DATA not set!
__bionic_open_tzdata_path: ANDROID_ROOT not set!
crw-rw---- 1 root root 246, 0 1970-01-01 00:00 /dev/gpiomem

how do i deal with these __bionic_open_tzdata_path: ANDROID_ROOT not set!
__bionic_open_tzdata_path: ANDROID_DATA not set!

accessing gpios using eg echo 0 >/sys/class/gpio/gpio24/value
works very well only on terminal i can turn on and off leds the problem is to access the gpios from apps c++ code is the problem

kalkov

i using qt to do my android apps

You need to set linux read/write permissions for files you want to access. You have to do it statically after boot (see /data/init.d) or call su from your application (see tutorials on the internet).

how do i deal with these __bionic_open_tzdata_path

Update to latest OS version, it should be fixed by now.

tinashe

thank you
it worked