#!/usr/bin/ruby
# ubx-get.rb - Utility to retrieve Almanac and Ephemeris data from u-blox GPS
# receivers
#
# Copyright 2008 OpenMoko, Inc.
# Authored by Daniel Willmann <daniel@openmoko.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

gem_original_require 'serialport'

require 'ubx-config'

device = SerialPort.new(ARGV[0], baudrate=9600, databits=8, stopbits=1, parity=SerialPort::NONE)
device.read_timeout=-1
if ARGV[1]
	fd = File.open(ARGV[1], 'w')
end

worker = Thread.new() {
	stream = []
	while true
		begin
			stream << device.getc
			(msg, len) = Message.parse(stream.map {|i| i.chr}.to_s)
			if msg
				puts msg.to_a.inspect
				foo = Marshal.dump(msg)
				if fd
					fd.write([foo.length].pack("v"))
					fd.write(foo)
				end
			end
			stream = stream[len..-1]
		rescue
			puts "An error occurred: #{$!}"
			stream = [ ]
		end
	end
}

sleep(1)

foo = Message.new(:AID, :ALM, [])
puts "Almanach request"
device.write(foo.to_s)
device.flush()
sleep(2)

foo = Message.new(:AID, :EPH, [])
puts "Ephimeris request"
device.write(foo.to_s)
device.flush()
sleep(2)

#foo = Message.new(:AID, :HUI, [])
#puts "Health info request"
#device.write(foo.to_s)
#device.flush()
#sleep(2)

if fd
	fd.close
end