#! /usr/bin/python
# Written by Dan Mandle http://dan.mandle.me September 2012
# http://www.danmandle.com/blog/getting-gpsd-to-work-with-python/
# License: GPL 2.0 

# This code runs compatibly under Python 2 and 3.x for x >= 2.
# Preserve this property!
from __future__ import absolute_import, print_function, division

import os
from gps import *
from time import *
import time
import threading

gpsd = None #seting the global variable

os.system('clear') #clear the terminal (optional)

class GpsPoller(threading.Thread):
  def __init__(self):
    threading.Thread.__init__(self)
    global gpsd #bring it in scope
    gpsd = gps(mode=WATCH_ENABLE) #starting the stream of info
    self.current_value = None
    self.running = True #setting the thread running to true

  def run(self):
    global gpsd
    while gpsp.running:
      next(gpsd) #this will continue to loop and grab EACH set of gpsd info to clear the buffer

if __name__ == '__main__':
  gpsp = GpsPoller() # create the thread
  try:
    gpsp.start() # start it up
    while True:
      #It may take a second or two to get good data
      #print gpsd.fix.latitude,', ',gpsd.fix.longitude,'  Time: ',gpsd.utc

      os.system('clear')

      print()
      print(' GPS reading')
      print('----------------------------------------')
      print('latitude    ' , gpsd.fix.latitude)
      print('longitude   ' , gpsd.fix.longitude)
      print('time utc    ' , gpsd.utc,' + ', gpsd.fix.time)
      print('altitude (m)' , gpsd.fix.altitude)
      print('eps         ' , gpsd.fix.eps)
      print('epx         ' , gpsd.fix.epx)
      print('epv         ' , gpsd.fix.epv)
      print('ept         ' , gpsd.fix.ept)
      print('speed (m/s) ' , gpsd.fix.speed)
      print('climb       ' , gpsd.fix.climb)
      print('track       ' , gpsd.fix.track)
      print('mode        ' , gpsd.fix.mode)
      print()
      print("%s satellites in view:" % len(gpsd.satellites))
      for sat in gpsd.satellites:
          print("    %r" % sat)

      time.sleep(5) #set to whatever

  except (KeyboardInterrupt, SystemExit): #when you press ctrl+c
    print("\nKilling Thread...")
    gpsp.running = False
    gpsp.join() # wait for the thread to finish what it's doing
  print("Done.\nExiting.")