#!/usr/bin/ruby

# Must be run as root

# Tom Trebisky  8-16-2018
# Blink the status LED on a Nanopi Fire3
# This is on GPIO B12, so bit 32+12 = 44

$bit = 44.to_s
$base = "/sys/class/gpio"
$export = "/sys/class/gpio/export"
$unexport = "/sys/class/gpio/unexport"

$gpiodir = $base + "/gpio" + $bit
$gpioval = $gpiodir + "/value"

def setup
	system "echo \"#{$bit}\" > #{$export}"
end

def cleanup
	system "echo \"#{$bit}\" > #{$unexport}"
	puts ""
	puts "All done"
end

def blink
	loop {
		sleep 0.5
		system "echo 0 >#{$gpioval}"
		sleep 0.5
		system "echo 1 >#{$gpioval}"
	}
end

setup

begin
	blink
rescue Interrupt
	cleanup
end

# THE END