GPIOs have probably not changed, as they are hard-wired in the PCB. Perhaps you need to rework your app to use a compatible method of accessing them.
yeah I did that and it was working but after reboot
i cannot find GPIOs
ls -l /sys/class/gpio/ gives
root@mylinkit:~# ls -l /sys/class/gpio/
--w------- 1 root root 4096 Jan 1 1970 export
lrwxrwxrwx 1 root root 0 Jan 1 1970 gpiochip0 -> ../../devices/platform/10000000.palmbus/10000600.gpio/gpio/gpiochip0
lrwxrwxrwx 1 root root 0 Jan 1 1970 gpiochip32 -> ../../devices/platform/10000000.palmbus/10000600.gpio/gpio/gpiochip32
lrwxrwxrwx 1 root root 0 Jan 1 1970 gpiochip64 -> ../../devices/platform/10000000.palmbus/10000600.gpio/gpio/gpiochip64
--w------- 1 root root 4096 Jan 1 1970 unexport
earlier there were GPIOs 14 17 and 04
edit:
It seems I also cant read from the UART at /dev/ttyS0
Sysfs access to GPIOs is deprecated by Linux, though still possible. As this is deprecated, OpenWrt typically does not “export” GPIO lines in default configurations, preferring upstream-supported mechanisms.
Thanks for the info but the weird thing is that is was working earlier after the upgrade but when I did a reboot GPIOs 14 17 and 04 disappeared.
I am new to linux development sorry
How can I now access these GPIOs
Removal in 2020 https://www.kernel.org/doc/Documentation/ABI/obsolete/sysfs-gpio
https://www.kernel.org/doc/Documentation/gpio/sysfs.txt
The user-land tools are available as a package, gpiod-tools
Thanks I could get the GPIOs working
now on to UART communication
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