# horrible abuse of bash to poll the Quantron imx keypad for key presses
a=0
b=0
c=0

while true ; do
        (( i=$(printf "2#"; printf "%d" $(cat /sys/class/gpio/gpio{61..68}/value) ) ))

        case $i in
                240) # no key pressed
                        ;;
                176) # "C/100%" key
                        (( a++, b=0, c=0 ))
                        ;;
                224) # "enter" key
                        (( a=0, b++, c=0 ))
                        ;;
                208) # "ESC" key
                        (( a=0, b=0, c++ ))
                        ;;
                *)
                        (( a=0, b=0, c=0 ))
                        ;;
        esac

        if (( (a+b+c) > 4 )) ; then
                printf "a=%d, b=%d, c=%d\n" $a $b $c
                exit 0
        fi

        msleep 10
done