A script to detect and report Boogie Board Rip events on linux via USB

BBR

require 'rubygems'
require 'hex_string'

begin
	lsusb = `lsusb`
	if lsusb.split("\n").select{|l| l.include? "2047:ffe7"}.count == 0
		raise "Boogie Board Rip not currently connected"
	end

	begin
		dmesg = `dmesg`
		bbdev = dmesg.split("\n").select{|l| l.match "2047:FFE7.*hidraw[0-9]"}.pop.match("(hidraw[0-9]+)").to_s
		raise RuntimeError if bbdev.empty? 
	rescue NoMethodError, RuntimeError
		raise "Boogie Board Rip detected, but device's path could not be determined"
	end

	events = []
	threads = []

	thread = Thread.new do
		board = File.new("/dev/"+bbdev, 'r')
		while true do
			data = board.sysread(32)
			events << data.to_hex_string.split(' ')
		end
	end
	threads << thread

	thread = Thread.new do
		previous = Array.new(32, "00")
		current = []
		while true do
			current = events.shift
			next if current.nil?

			if current[10] != previous[10]
				state = current[10].hex
				pstate = previous[10].hex
				lock = 32
				erase = 4
				wake = 2
				if (pstate == pstate | lock) && (state != state | lock)
					puts "Board unlocked"
				elsif (pstate != pstate | lock) && (state == state | lock)
					puts "Board locked"
				end
				if (pstate == pstate | erase) && (state != state | erase)
					puts "Erase released"
				elsif (pstate != pstate | erase) && (state == state | erase)
					puts "Erase Pressed"
				end
				if (pstate == pstate | wake) && (state != state | wake)
					puts "Wake released"
				elsif (pstate != pstate | wake) && (state == state | wake)
					puts "Wake Pressed"
				end
			end
			if current[3] != previous[3]
				state = current[3].hex
				pstate = previous[3].hex
				detected = 32
				contact = 1
				if (pstate == pstate | detected) && (state != state | detected)
					puts "Pen Lost"
				elsif (pstate != pstate | detected) && (state == state | detected)
					puts "Pen Detected"
				end
				if (pstate == pstate | contact) && (state != state | contact)
					puts "Pen contact lost"
				elsif (pstate != pstate | contact) && (state == state | contact)
					puts "Pen contact detected"
				end
			end
			cury = current[5]+current[4]
			curx = current[7]+current[6]
			prey = previous[5]+previous[4]
			prex = previous[7]+previous[6]
			if cury != prey || curx != prex
				cury = cury.hex
				curx = curx.hex
				prey = prey.hex
				prex = prex.hex
				puts "Pen moved from ("+prex.to_s+","+prey.to_s+") to ("+curx.to_s+","+cury.to_s+")"
			end	
			previous = current
		end
	end
	threads << thread

	threads.each{ |thread| thread.join}
	
rescue RuntimeError => error
	puts error
end