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