Writing User Space Program for AT91SAMA5 to control LEDs

hi,

I am new to embedded linux . I have recently got a board from Atmel SAMA53D3x .
However , no proper documentation is available on how to write applications .

Can anyone tell me how can i write a user space program to modify GPIOs
using buit-in GPIO driver .

Thanks and Regards ,
Rahul

For me the easiest way is to enable sysfs in the kernel.
Device Drivers -> GPIO Support -> /sys/class/gpio/... (sysfs interface)
Documentation/gpio.txt