#!/bin/bash

# TACT SW 1
sudo config-pin P8_45 gpio >/dev/null

# LED 1
sudo config-pin P8_46 gpio >/dev/null

# init
sudo gpioset gpiochip2 7=0

GPIOSET_PID=""

# input loop
while read line
do
    event=`echo ${line} | sed -n 's/.*\(RISING\|FALLING\) EDGE.*/\1/p'`
    echo "*** ${event} ***"

    if [ -n "${GPIOSET_PID}" ]; then
        sudo kill "${GPIOSET_PID}" 2>/dev/null
    fi

    case "${event}" in
        RISING)
            sudo gpioset --mode=signal gpiochip2 7=1 & GPIOSET_PID=$!
            ;;
        FALLING)
            sudo gpioset --mode=signal gpiochip2 7=0 & GPIOSET_PID=$!
            ;;
     esac
done < <(sudo stdbuf -oL gpiomon gpiochip2 6)