It is Based on NEO-6 u-blox 6 GPS Modules, GPRS module, Linux kernel 2.6.30, busybox, Qt 4.5 and TQ2440.
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Include the header file
#include "gps.h" -
open the GPS device，
int openGPS(char *dev);int fd; fd = openGPS("/dev/tq2440_serial1"); -
Read GPS data，
int readGPS(int fd);，then can access the stucture of "gprmc， gpgsv， gpgsa"readGPS(fd);//openGPS() need 2 seconds or more printf("Now the time is: %d:%d:%d.\n", gprmc.hour, gprmc.minute, gprmc.second); -
Close GPS device，
int closeGPS(int fd);closeGPS(fd);
Option: Print all received NEMA command，int printCommand(void);
Option: Print all analysized data，int printData(void);
Option: Configure GPS，int cfg(int fd, const char *buf);
#include "serial.h"
......
cfg(fd, cfg_rate_1000); //Default 1Hz
cfg(fd, cfg_msg_GPGLL_off); //Close GPGLL
cfg(fd, cfg_msg_GPGGA_off); //Close GPGGA
cfg(fd, cfg_msg_GPVTG_off); //CLose GPVTG
cfg(fd, cfg_rst_prt_38400); //Change the baud rate of GPS to 38400
init_serial(fd, B38400); //Change the baud rate of Uart to 38400
cfg(fd, cfg_cfg_save); //Save configuration
......
C interface, all important sturts and functions are included in gps.h. After running readGPS(int fd), data will be saved.
gprmc
char status; //A: valid，V: invalid
char n; //N. S
char e; //E/W
int hour; //hour
int minute; //minute
int second; //second
int day; //day
int month; //month
int year; //year
int lati_degree; //latitude, degree
int lati_minute; //latitude, minute
double lati_second; //latitude, second
int long_degree; //longtitude, degree
int long_minute; //longtitude, minute
double long_second; //longtitude, second
double kmph; //speed, km/h
gpgsv
int id[50]; //the id of the visiable satellites
int no; //the number of the visiable satellites
gpgsa
int id[14]; //the id of the located satellites
gpgga
int number; //the numbers of the located satellites
double altitude; //attitude, meters
int cfg(int fd, const char *buf);
char cfg_rate_10000[];
char cfg_rate_2000[];
char cfg_rate_1000[];
char cfg_rate_500[];
char cfg_rate_200[];
char cfg_rst_cs_wd[]; //enable watchdog
char cfg_rst_cs_stop[]; //cold start, stop all GPS activities
char cfg_rst_cs_start[]; //cold start,, start all GPS activities
char cfg_rst_prt_38400[];
char cfg_rst_prt_9600[];
char cfg_msg_GPGGA_off[];
char cfg_msg_GPGGA_on[];
char cfg_msg_GPGLL_off[];
char cfg_msg_GPGLL_on[];
char cfg_msg_GPVTG_off[];
char cfg_msg_GPVTG_on[];
char cfg_cfg_save[];
int openGPRS(char *dev); //enable GPRS module
int send_position(int fd); //Send a message: the current position
int send_error(int fd); //Send a message: 当前未定位
int receive_zh_message(int fd); //Accept Chinese message
int closeGPRS(int fd); //disalbe GPRS module
Test code.
Master version.
GUI: Enalbe GPS, disable GPS, shutdown, reboot.
Development version.
Author: DR_MING
Email: elecming@gmail.com
From: Guangdong University of Technology