[NUC970/N9H30] GPIO control

[pseudonym]

Q: I am trying to access gpio from userspace using /sys/class/gpio entry. But getting following error

Code: Select all

# echo 0 > /sys/class/gpio/export
Please Check GPIOA00's multi-function = 0x2 
sh: write error: Invalid argument
# echo 1 > /sys/class/gpio/export
Please Check GPIOA01's multi-function = 0x2 
sh: write error: Invalid argument

A: It's because PA0 and PA1 is configured as LCD pin (multi-function = 0x2) in kernel configuration, not GPIO.