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/***************************************************************************
* gpsclient.c
*
* Copyright 2005 Ian McIntosh
* ian_mcintosh@linuxadvocate.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 Library 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.
*/
/*
Purpose of gpsclient.c:
- Provide a sanitized interface to GPSD.
*/
#define HAVE_GPSD // XXX: this should come from configure.ac
#include <gtk/gtk.h>
#include <gps.h>
#include "main.h"
#include "gpsclient.h"
struct {
#ifdef HAVE_GPSD
struct gps_data_t * pGPSConnection; // gps_data_t is from gpsd.h
#endif
gpsdata_t* pPublicGPSData; // our public struct (annoyingly similar name...)
} g_GPSClient = {0};
gboolean gpsclient_callback_data_waiting(GIOChannel *source, GIOCondition condition, gpointer data);
static void gpsclient_connect(void);
void gpsclient_init()
{
g_GPSClient.pPublicGPSData = g_new0(gpsdata_t, 1);
#ifndef HAVE_GPSD
// No libgpsd at compile time
g_GPSClient.pPublicGPSData->eStatus = GPS_STATUS_NO_GPS_COMPILED_IN;
#endif
gpsclient_connect();
}
static void gpsclient_connect(void)
{
#ifdef HAVE_GPSD
// don't do anything if already connected
if(g_GPSClient.pPublicGPSData->eStatus != GPS_STATUS_NO_GPSD) return; // already connected
// make sure we clean up
if(g_GPSClient.pGPSConnection) {
gps_close(g_GPSClient.pGPSConnection);
}
// g_print("Attempting connection to GPSD...\n");
// connect
g_GPSClient.pGPSConnection = gps_open("localhost", DEFAULT_GPSD_PORT);
if(g_GPSClient.pGPSConnection) {
// turn on streaming of GPS data
gps_query(g_GPSClient.pGPSConnection, "w+x\n");
g_io_add_watch(g_io_channel_unix_new(g_GPSClient.pGPSConnection->gps_fd),
G_IO_IN, gpsclient_callback_data_waiting, NULL);
// assume no GPS device is present
g_GPSClient.pPublicGPSData->eStatus = GPS_STATUS_NO_DEVICE;
}
else {
g_GPSClient.pPublicGPSData->eStatus = GPS_STATUS_NO_GPSD;
}
#endif
}
const gpsdata_t* gpsclient_getdata()
{
gpsclient_connect(); // connect if necessary
return g_GPSClient.pPublicGPSData;
}
// callback for g_io_add_watch on the GPSD file descriptor
gboolean gpsclient_callback_data_waiting(GIOChannel *_source_unused, GIOCondition eCondition, gpointer _data_unused)
{
#ifdef HAVE_GPSD
// g_print("Data from GPSD...\n");
g_assert(g_GPSClient.pGPSConnection != NULL);
g_assert(g_GPSClient.pPublicGPSData != NULL);
gpsdata_t* l = g_GPSClient.pPublicGPSData; // our public data struct, for easy access
// is there data waiting on the socket?
if(eCondition == G_IO_IN) {
// read new data
if(gps_poll(g_GPSClient.pGPSConnection) == -1) {
l->eStatus = GPS_STATUS_NO_GPSD;
g_print("gps_poll failed\n");
return FALSE;
}
// parse new data
struct gps_data_t* d = g_GPSClient.pGPSConnection; // gpsd data
// is a GPS device available?
if(d->online) {
// Do we have a satellite fix?
if(d->status != STATUS_NO_FIX) {
// a GPS device is present and working!
l->eStatus = GPS_STATUS_LIVE;
l->ptPosition.fLatitude = d->fix.latitude;
l->ptPosition.fLongitude= d->fix.longitude;
if(d->pdop < PDOP_EXCELLENT) {
l->fSignalQuality = GPS_SIGNALQUALITY_5_EXCELLENT;
}
else if(d->pdop < PDOP_GOOD) {
l->fSignalQuality = GPS_SIGNALQUALITY_4_GOOD;
}
else if(d->pdop < PDOP_FAIR) {
l->fSignalQuality = GPS_SIGNALQUALITY_3_FAIR;
}
else if(d->pdop < PDOP_POOR) {
l->fSignalQuality = GPS_SIGNALQUALITY_2_POOR;
}
else {
l->fSignalQuality = GPS_SIGNALQUALITY_1_TERRIBLE;
}
// Set speed
l->fSpeedInKilometersPerHour = (d->fix.speed * KNOTS_TO_KPH);
l->fSpeedInMilesPerHour = (d->fix.speed * KNOTS_TO_MPH);
// Dampen Noise when not moving fast enough for trustworthy data
if(l->fSignalQuality <= GPS_SIGNALQUALITY_2_POOR &&
l->fSpeedInMilesPerHour <= 2.0)
{
l->fSpeedInMilesPerHour = 0.0;
l->fSpeedInKilometersPerHour = 0.0;
}
}
else {
l->eStatus = GPS_STATUS_NO_SIGNAL;
l->ptPosition.fLatitude = 0.0;
l->ptPosition.fLongitude= 0.0;
}
}
else {
l->eStatus = GPS_STATUS_NO_DEVICE;
}
}
else {
//g_print("eCondition: %d\n", eCondition);
}
return TRUE; // TRUE = keep socket notification coming
#endif
}
#ifdef ROADSTER_DEAD_CODE
/*
static void gpsclient_debug_print(void)
{
struct gps_data_t* d = g_GPSClient.pGPSConnection; // gpsd data
g_print("online = %d, ", d->online);
g_print("latitude = %f, ", d->latitude);
g_print("longitude = %f, ", d->longitude);
g_print("speed = %f, ", d->speed);
g_print("track = %f, ", d->track);
g_print("status = %d, ", d->status);
g_print("mode = %d, ", d->mode);
g_print("satellites_used = %d, ", d->satellites_used);
g_print("pdop = %f, ", d->pdop);
g_print("hdop = %f, ", d->hdop);
g_print("vdop = %f, ", d->vdop);
g_print("satellites = %d, ", d->satellites);
g_print("gps_fd = %d\n\n", d->gps_fd);
}
*/
#endif
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