#!/bin/sh
GPIOBASE=`cat /sys/class/gpio/gpiochip*/base | head -n1`
GPIOmin=`expr $1 + $GPIOBASE`
GPIOmax=`expr $2 + $GPIOBASE`
nums=`seq $GPIOmin $GPIOmax`
 
for i in $nums; do
	echo "${i}" > /sys/class/gpio/export
	if [ -f "/sys/class/gpio/gpio${i}/value" ] ; then
		echo "out" > "/sys/class/gpio/gpio${i}/direction"
	fi
done

while true; do
	for i in $nums; do
		if [ -f "/sys/class/gpio/gpio${i}/value" ] ; then
			echo "0" > "/sys/class/gpio/gpio${i}/value"
		fi
	done
	sleep 1
	for i in $nums; do
		if [ -f "/sys/class/gpio/gpio${i}/value" ] ; then
			echo "1" > "/sys/class/gpio/gpio${i}/value"
		fi
	done
	sleep 1
	echo "blink"
done