# echo 2 > /sys/class/gpio/export
Please Check GPIOA02's multi-function = 0x4
sh: write error: Invalid argument
# echo 3 > /sys/class/gpio/export
Please Check GPIOA03's multi-function = 0x4
sh: write error: Invalid argument
# echo 4 > /sys/class/gpio/export
Please Check GPIOA04's multi-function = 0x4
sh: write error: Invalid argument
# echo 5 > /sys/class/gpio/export
Please Check GPIOA05's multi-function = 0x4
sh: write error: Invalid argument
# echo 6 > /sys/class/gpio/export
Please Check GPIOA06's multi-function = 0x4
sh: write error: Invalid argument