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add gpio.sh handy bash command

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This commit is contained in:
Calin Crisan 2017-05-11 20:06:44 +03:00
parent e012a475d8
commit 91e27c051b
1 changed files with 20 additions and 0 deletions
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20
board/common/overlay/usr/bin/gpio.sh Executable file
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@ -0,0 +1,20 @@
#!/bin/bash
GPIO=$1
usage() {
echo "Usage: $0 <gpio> [0|1]" 1>&2
exit 1
}
test -z "$GPIO" && usage
test -e /sys/class/gpio/gpio$GPIO || echo $GPIO > /sys/class/gpio/export
if [ -n "$2" ]; then
echo out > /sys/class/gpio/gpio$GPIO/direction
echo $2 > /sys/class/gpio/gpio$GPIO/value
else
echo in > /sys/class/gpio/gpio$GPIO/direction
cat /sys/class/gpio/gpio$GPIO/value
fi