SATS/lib/gpio/in

#!/bin/sh


# [1] If empty pin number
#========================================================#
if [ -z "$1" ]; then

	echo 127;
	exit 127;
fi;



# [2] Check if valid pin number (integer)
#========================================================#
test $1 -ge 0 2> /dev/null;

if [ $? -gt 1 ]; then

	echo 127;
	exit 127;

fi;



# [3] Activate (if not already)
#========================================================#
test -d /sys/class/gpio/gpio$1 || echo $1 > /sys/class/gpio/export;



# [4] Set mode to IN
#========================================================#
cat /sys/class/gpio/gpio$1/direction | grep -v "in" && echo "in" > /sys/class/gpio/gpio$1/direction;




# [5] RETURN VALUE
#========================================================#
VALUE="`cat /sys/class/gpio/gpio$1/value`";

echo $VALUE;
exit $VALUE;