Dumb GPIO input test script

Not very intelligent - no bound checking or validity checking.
Just lets you see the GPIO input status, and show the 'direction'
bug that is present where even when the direction is initially
in on export, that the IO pin doesn't respond.

Author: pfeerick

testing/gpio-input-test.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+RootCheck() {
+	if [ "$(id -u)" != "0" ]; then
+		echo "${0##*/} requires root privleges - run as root or through sudo. Exiting" >&2
+		exit 1
+	fi
+}
+
+usage() {
+        echo "Usage:"
+        echo "$ $0 <gpio> [-in]"
+        echo ""
+        echo " gpio - gpio number to test"
+        echo ""
+        echo " -in  - set the direction to be 'in'"
+        echo ""
+        exit 1
+}
+
+cleanup() {
+        echo "CTRL-C pressed!"
+        echo ${GPIO_NUM} > "${GPIO_PATH}/unexport"
+        exit 0
+}
+
+if [[ $# -ne 1 ]] && [[ $# -ne 2 ]]; then
+    usage
+fi
+
+RootCheck
+
+#catch Ctrl+C
+trap cleanup 2
+
+GPIO_NUM="$1"
+GPIO_PATH="/sys/class/gpio/"
+
+test ! -e ${GPIO_PATH}${GPIO_NUM} && echo 73 > "/sys/class/gpio/export"
+
+if [[ $2 == "-in" ]]; then
+        echo -ne "'direction' of GPIO #${GPIO_NUM} is currently "
+        cat ${GPIO_PATH}/gpio${GPIO_NUM}/direction
+        echo "Setting direction to 'in'..."
+        echo in > ${GPIO_PATH}/gpio${GPIO_NUM}/direction
+fi
+
+while true; do
+	echo -ne "value of GPIO #${GPIO_NUM}: "
+	cat ${GPIO_PATH}${GPIO_NUM}/value
+	sleep 1
+done