gps.c File Reference

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include "lib.h"
#include "gps.h"
#include "menu.h"
#include "main.h"
#include "utils.h"

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Macros
#define	MAX_TIME_OFFSET   60UL
#define	MAX_FIX_TIMEOUT   30UL
#define	MAX_UPDATE_TIMEOUT   30UL
#define	AUTOPOWERDOWN_TIME    (3 * 60)
#define	MAX_BUF   300
#define	DATE   10
#define	TIME   8
#define	SECS_PER_HOUR   (60UL * 60UL)
#define	SECS_PER_DAY   (60UL * 60UL * 24UL)
#define	DAYS_PER_YEAR   (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31)
#define	BREAD_CRUMB_TRAIL_TIME   15
#define	GPS_IDLE_STATE   0
#define	GPS_READING_RECORD_STATE   1
#define	GPS_READING_CHECKSUM_STATE   2
#define	GPS_END_OF_RECORD_STATE   3

Functions
int	checksum (const char *string)
	Calculates the NMEA183 checksum.
int	get_gps_pos_date_time (const char *string, char *pszLatitude, char *longitude, char *time, char *date)
	Get the latitude, longitude and GPS date/time from the NMEA183 RMC (Recommended Minimum Specific GPS data) sentence.
unsigned long	_time (void)
	Converts current date and time to system time value.
unsigned long	_mktime (struct time *t, struct date *d)
	converts current system time to timae and date structures.
void	GPSStart (void)
	Inititalizes the GPS system.
void	GPSService (void)
	GPS radio polling service.
void	CalculateAlternateGPSFormat (void)
void	ConvertNMEAToAlternateFormats (char *pszNMEA, char *pszDD, char *pszDMS, int fLong)
	Calculates and converts the coordinates from NMEA reading.
void	getDateTime (unsigned long ulTime, struct time *t, struct date *d)
	Converts a system time value to a time and date structure.
void	GPSUpdateTestDisplay (void)
	Displays the GPS coordinates in their current format for the GPS test.
void	ResetBreadCrumbTimer (void)
	Resets or disables the GPS breadcrumb timer.
void	ServiceBreadCrumbTimer (void)
void	GPSSaveBreadCrumb (void)
	Saves breadcrumb.

Variables
int	g_BreadCrumbTime
int	g_BreadCrumbFlag
unsigned long	g_NextBreadCrumb
char	g_gpsDate [DATE+1]
char	g_gpsTime [TIME+1]
unsigned long	last_fix
unsigned char	g_fSuspendConversion
char	g_Latitude [LATITUDE_DMS+1]
char	g_Longitude [LONGITUDE_DMS+1]
char	g_LatitudeRaw [LATITUDE_DMS+1]
char	g_LongitudeRaw [LONGITUDE_DMS+1]
char	g_LatitudeDD [LATITUDE_DMS+1]
char	g_LongitudeDD [LONGITUDE_DMS+1]
char	g_LongitudeDMS [LONGITUDE_DMS+2]
char	g_LatitudeDMS [LATITUDE_DMS+1]
const char	g_EmptyLatitude [] = "0000.0000X"
const char	g_EmptyLongitude [] = "00000.0000X"
int	g_GPS_breadcrumbTimer
int	g_GPS_Test_Mode
const char	g_pszGPSBreadCrumb [] = "GPS Bread Crumb"
int	g_nBreadCrumbIndex
unsigned long	g_nGPSStandbyTimeout
long	gps_data_format
long	time_zone_offset
long	time_zone_change
unsigned int	timer []
int	g_util_timeout
int	gpsReadState
int	gpsCharCount
int	g_gpsfix
char	gpsString [MAX_BUF+1]
char	gpsLastString [MAX_BUF+1]
int	g_gpsOptions
char	GPSBuffer [100]
gps	currentFix
const unsigned short int	month_len []

Macro Definition Documentation

AUTOPOWERDOWN_TIME

#define AUTOPOWERDOWN_TIME    (3 * 60)

BREAD_CRUMB_TRAIL_TIME

#define BREAD_CRUMB_TRAIL_TIME   15

DATE

#define DATE   10

DAYS_PER_YEAR

#define DAYS_PER_YEAR   (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31)

GPS_END_OF_RECORD_STATE

#define GPS_END_OF_RECORD_STATE   3

GPS_IDLE_STATE

#define GPS_IDLE_STATE   0

GPS_READING_CHECKSUM_STATE

#define GPS_READING_CHECKSUM_STATE   2

GPS_READING_RECORD_STATE

#define GPS_READING_RECORD_STATE   1

MAX_BUF

#define MAX_BUF   300

MAX_FIX_TIMEOUT

#define MAX_FIX_TIMEOUT   30UL

MAX_TIME_OFFSET

#define MAX_TIME_OFFSET   60UL

MAX_UPDATE_TIMEOUT

#define MAX_UPDATE_TIMEOUT   30UL

SECS_PER_DAY

#define SECS_PER_DAY   (60UL * 60UL * 24UL)

SECS_PER_HOUR

#define SECS_PER_HOUR   (60UL * 60UL)

TIME

#define TIME   8

Function Documentation

_mktime()

unsigned long _mktime	(	struct time *	t,
		struct date *	d )

converts current system time to timae and date structures.

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_time()

unsigned long _time

(

void

)

Converts current date and time to system time value.

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CalculateAlternateGPSFormat()

void CalculateAlternateGPSFormat

(

void

)

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checksum()

int checksum

(

const char *

string

)

Calculates the NMEA183 checksum.

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ConvertNMEAToAlternateFormats()

void ConvertNMEAToAlternateFormats	(	char *	pszNMEA,
		char *	pszDD,
		char *	pszDMS,
		int	fLong )

Calculates and converts the coordinates from NMEA reading.

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get_gps_pos_date_time()

int get_gps_pos_date_time	(	const char *	string,
		char *	pszLatitude,
		char *	longitude,
		char *	time,
		char *	date )

Get the latitude, longitude and GPS date/time from the NMEA183 RMC (Recommended Minimum Specific GPS data) sentence.

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getDateTime()

void getDateTime	(	unsigned long	ulTime,
		struct time *	t,
		struct date *	d )

Converts a system time value to a time and date structure.

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GPSSaveBreadCrumb()

void GPSSaveBreadCrumb

(

void

)

Saves breadcrumb.

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GPSService()

void GPSService

(

void

)

GPS radio polling service.

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GPSStart()

void GPSStart

(

void

)

Inititalizes the GPS system.

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GPSUpdateTestDisplay()

void GPSUpdateTestDisplay

(

void

)

Displays the GPS coordinates in their current format for the GPS test.

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ResetBreadCrumbTimer()

void ResetBreadCrumbTimer

(

void

)

Resets or disables the GPS breadcrumb timer.

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ServiceBreadCrumbTimer()

void ServiceBreadCrumbTimer

(

void

)

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Variable Documentation

currentFix

gps currentFix

g_BreadCrumbFlag

int g_BreadCrumbFlag

g_BreadCrumbTime

int g_BreadCrumbTime

g_EmptyLatitude

const char g_EmptyLatitude[] = "0000.0000X"

g_EmptyLongitude

const char g_EmptyLongitude[] = "00000.0000X"

g_fSuspendConversion

unsigned char g_fSuspendConversion

g_GPS_breadcrumbTimer

int g_GPS_breadcrumbTimer

g_GPS_Test_Mode

int g_GPS_Test_Mode

g_gpsDate

char g_gpsDate[DATE+1]

g_gpsfix

int g_gpsfix

g_gpsOptions

int g_gpsOptions

g_gpsTime

char g_gpsTime[TIME+1]

g_Latitude

char g_Latitude[LATITUDE_DMS+1]

g_LatitudeDD

char g_LatitudeDD[LATITUDE_DMS+1]

g_LatitudeDMS

char g_LatitudeDMS[LATITUDE_DMS+1]

g_LatitudeRaw

char g_LatitudeRaw[LATITUDE_DMS+1]

g_Longitude

char g_Longitude[LONGITUDE_DMS+1]

g_LongitudeDD

char g_LongitudeDD[LONGITUDE_DMS+1]

g_LongitudeDMS

char g_LongitudeDMS[LONGITUDE_DMS+2]

g_LongitudeRaw

char g_LongitudeRaw[LONGITUDE_DMS+1]

g_nBreadCrumbIndex

int g_nBreadCrumbIndex

g_NextBreadCrumb

unsigned long g_NextBreadCrumb

g_nGPSStandbyTimeout

unsigned long g_nGPSStandbyTimeout

g_pszGPSBreadCrumb

const char g_pszGPSBreadCrumb[] = "GPS Bread Crumb"

g_util_timeout

int g_util_timeout

extern

gps_data_format

long gps_data_format

extern

GPSBuffer

char GPSBuffer[100]

gpsCharCount

int gpsCharCount

gpsLastString

char gpsLastString[MAX_BUF+1]

gpsReadState

int gpsReadState

gpsString

char gpsString[MAX_BUF+1]

last_fix

unsigned long last_fix

month_len

const unsigned short int month_len[]

Initial value:

= {31, 28, 31, 30, 31, 30,
                                        31, 31, 30, 31, 30, 31}

time_zone_change

long time_zone_change

extern

time_zone_offset

long time_zone_offset

extern

timer

unsigned int timer[]

extern