https://torte71.github.io/InsideSovolKlipperScreen/makerbase-soft-shutdown-files.html
[Unit] Description=makerbase-soft-shutdown After=network.target Wants=udev.target [Install] WantedBy=multi-user.target [Service] Type=oneshot ExecStart=/root/soft_shutdown.sh
#!/bin/bash
#enable the control of the supper capacitor,GPIO3_A4
if [ -d /sys/class/gpio/gpio100 ]
then
echo out > /sys/class/gpio/gpio100/direction
echo 0 > /sys/class/gpio/gpio100/value
else
echo 100 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio100/direction
echo 0 > /sys/class/gpio/gpio100/value
fi
#power-off signal,gpio85(GPIO2_C5)
if [ -d /sys/class/gpio/gpio85 ]
then
echo in > /sys/class/gpio/gpio85/direction
else
echo 85 > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio85/direction
fi
while :
do
#level=`cat /sys/class/gpio/gpio85/value` #Detect the power-off signal,gpio85(GPIO1_B2)
#echo "gpio:$((level))"
if [ "$level" = 1 ]
then
sync
# shutdown -h now
fi
sync
sleep 2
done