Archived:How to read GPS data in PySymbian

This code snippet explains how to use the positioning module to get information from an internal or external GPS module in PySymbian.

Article Metadata

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Compatibility

Platform(s): S60 2nd Edition FP 2, S60 3rd Edition

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Article

Keywords: positioning

Created: ilpo55 (28 Jul 2008)

Last edited: hamishwillee (08 Feb 2012)

Prerequisites

Get a GPS lock at least once before using this code to maximize efficiency.

Code

import e32, appuifw, positioning
 
 
def gps_init():
	#This function will start the updating of global variable (dictionary) 'gps_data' every 0.2 sec.
	#0.2 sec comes form 'interval = 200000' set according to your needs
	#This function uses callback funtion gps
	global gps_data
	#First this fills the gps_data with 0.0 so that there is something before the first gps update
	gps_data = {
	'satellites': {'horizontal_dop': 0.0, 'used_satellites': 0, 'vertical_dop': 0.0, 'time': 0.0,'satellites': 0, 'time_dop':0.0}, 
	'position': {'latitude': 0.0, 'altitude': 0.0, 'vertical_accuracy': 0.0, 'longitude': 0.0, 'horizontal_accuracy': 0.0}, 
	'course': {'speed': 0.0, 'heading': 0.0, 'heading_accuracy': 0.0, 'speed_accuracy': 0.0}
	}
	try:
		positioning.select_module(positioning.default_module())
		positioning.set_requestors([{"type":"service","format":"application","data":"gps_app"}])
		positioning.position(course=1,satellites=1,callback=gps, interval=200000,partial=0)
		e32.ao_sleep(3)
	except:
		appuifw.note(u'Problem with GPS','error')
 
def gps(event):
	global gps_data
	gps_data = event
 
def gps_stop():
	#This function stops GPS
	try:
		positioning.stop_position()
	except:
		appuifw.note(u'Problem with GPS','error')
 
 
#Testing
gps_init()
count = 0
while True:
	count = count + 1
	sat = gps_data['satellites']['used_satellites']
	pos_lat = gps_data['position']['latitude']
	pos_long = gps_data['position']['longitude']
	speed = gps_data['course']['speed']
	print count, sat, pos_lat, pos_long,speed
	e32.ao_sleep(1)