Robert,
You were correct high level is better for now. It's been a long while since
working
with 'c'. Went the way of a bash script. Works well see below. Even
supports --help.
---Code Start--
#!/bin/bash
#
# 4-7-2020 Ken
#
# cmd [state|label|on|off|in|out] gpio #
# Example : cmd state 112
#
if [ "$1" == "--help" ]
then
echo -e "\ngpio relay cape tool. 4-7-2020 KenUnix\n"
echo "state Get state of gpio number"
echo "label Display associated P number"
echo "on Set relay # to on"
echo "off Turn relay off"
echo -e "out Set gpio to out\n"
echo "Example: cmd status 115 Will display the state of gpio 115"
echo -e " cmd on 20 Will turn relay 1 on for gpio 20\n"
exit
fi
case $2 in
20|7|112|115) ;;
*) echo "Invalid gpio $2"
echo "Vaild numbers are 20, 7, 112 or 115"
echo -e "Relay 1 20, relay 2 7, relay 3 112, relay 4 115\007"
exit 1 ;;
esac
case $1 in
"state")
direction=`cat /sys/class/gpio/gpio$2/direction`
echo -n "Direction $direction, State "
state=`cat /sys/class/gpio/gpio$2/value`
if [ "$state" == "0" ]; then echo "off"; fi
if [ "$state" == "1" ]; then echo "on"; fi
exit ;;
"label")
echo -n "Physical header pin number "
cat /sys/class/gpio/gpio$2/label ;
exit ;;
"on")
echo 1 >/sys/class/gpio/gpio$2/value
exit ;;
"off")
echo 0 >/sys/class/gpio/gpio$2/value
exit ;;
"out")
echo "out" > /sys/class/gpio/gpio$2/direction ;
exit ;;
"in")
echo "in" > /sys/class/gpio/gpio$2/direction ;
exit ;;
*) echo -e "Invalid operation $1. Try cmd --help\007" ; exit 1 ;;
esac
--Code End--
Maybe someone else may find this useful.
Ken
--
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