gpioswitcher.sh

#!/bin/sh
# GPIO switcher
# Paul Philippov <[email protected]>

PIN=$1
MODE=$2

if [ -z "$PIN" ] || [ -z "$MODE" ]; then
  echo "Usage: $0 <pin#> <1|0|x>"
  exit 1
fi

if [ "x" = "$MODE" ]; then
  if [ ! -d "/sys/class/gpio/gpio${PIN}" ]; then
    echo "Pin ${PIN} is not exported."
    exit 2
  fi
  echo $PIN > /sys/class/gpio/unexport
else
  if [ ! -d "/sys/class/gpio/gpio${PIN}" ]; then
    echo $PIN > /sys/class/gpio/export
    echo out > /sys/class/gpio/gpio${PIN}/direction
  fi
  echo $MODE > /sys/class/gpio/gpio${PIN}/value
fi

dmesg | tail -10

ls -l /sys/class/gpio/

exit 0