GPS导航模块数据的监听

来源：互联网发布：美工是干嘛的编辑：程序博客网时间：2024/06/09 14:42

GPS是英文Global Positioning System（全球定位系统）的简称。利用GPS定位卫星，在全球范围内实时进行定位、导航的系统，称为全球卫星定位系统。GPS可以提供车辆定位、放到、反劫、行驶路线监控及呼叫等功能。要实现以上所有功能必须具备GPS终端、传输网络和监控平台三个要素。

我用得是深圳市伟辉创科技有限公司生产的GPS模块SF2820，iRF starⅢ高性能GPS 芯片组、极佳的灵敏度（追踪感度-159dBm）、在讯号微弱时，TTFF (Time To First Fix)定位仍十分迅速、支NMEA 0183 and SiRF binary 协定。监听前，先用串口将GPS模块和ARM开发板连接起来（可自己制作串口线，只需要发送、接收和地线三根线就可以了），将GPS天线连在GPS模块上，再将另一端放在室外接受数据，然后在板子上操作串口就可以了。具体步骤如下：

1、在开发板上用microcom命令监听：

我是将GPS模块连接在ttyS1这个串口，可以用microcom 命令打开串口设备，注意GPS模块的波特率是4800 如果波特率设置不对输出会出现乱码，按Ctrl-X退出：

[root@root /]# microcom -t 5000 -s 4800 dev/ttyS1
$GPGGA,041501.000,3029.6498,N,11423.6155,E,1,09,1.1,73.1,M,-13.7,M,,0000*40
$GPGSA,A,3,07,08,04,30,17,20,01,28,11,,,,2.5,1.1,2.3*33
$GPRMC,041501.000,A,3029.6498,N,11423.6155,E,0.28,302.18,040914,,,A*6C
$GPGGA,041502.000,3029.6499,N,11423.6154,E,1,09,1.1,72.6,M,-13.7,M,,0000*45
$GPGSA,A,3,07,08,04,30,17,20,01,28,11,,,,2.5,1.1,2.3*33
$GPRMC,041502.000,A,3029.6499,N,11423.6154,E,0.15,289.64,040914,,,A*68
$GPGGA,041503.000,3029.6500,N,11423.6154,E,1,09,1.1,72.5,M,-13.7,M,,0000*46
$GPGSA,A,3,07,08,04,30,17,20,01,28,11,,,,2.5,1.1,2.3*33
$GPRMC,041503.000,A,3029.6500,N,11423.6154,E,0.16,238.44,040914,,,A*63
$GPGGA,041504.000,3029.6501,N,11423.6154,E,1,09,1.1,72.2,M,-13.7,M,,0000*47
$GPGSA,A,3,07,08,04,30,17,20,01,28,11,,,,2.5,1.1,2.3*33
$GPGSV,3,1,12,04,72,207,39,01,68,049,24,28,53,332,18,30,52,230,43*77
$GPGSV,3,2,12,11,46,043,26,08,33,184,37,07,33,192,39,17,32,284,23*74

······

以上就是接受到的GPS数据。

2、编写用户程序监听：

[root@root /]# ./gps_test

GPS DATALen=412
GPS information as follow:
$GPGGA,054432.000,3029.6523,N,11423.6208,E,1,09,1.2,70.4,M,-13.7,M,,0000*4A
$GPGSA,A,3,17,28,20,30,32,04,01,10,06,,,,1.9,1.2,1.4*32
$GPRMC,054432.000,A,3029.6523,N,11423.6208,E,0.16,184.84,040914,,,A*67
$GPGGA,054433.000,3029.6520,N,11423.6205,E,1,09,1.2,72.3,M,-13.7,M,,0000*40
$GPGSA,A,3,17,28,20,30,32,04,01,10,06,,,,1.9,1.2,1.4*32
$GPRMC,054433.000,A,3029.6520,N,11423.6205,E,0.15,133.60,040914,,,A*6D

GPS DATALen=614
GPS information as follow:
$GPGGA,054434.000,3029.6517,N,11423.6204,E,1,09,1.2,74.0,M,-13.7,M,,0000*47
$GPGSA,A,3,17,28,20,30,32,04,01,10,06,,,,1.9,1.2,1.4*32
$GPGSV,3,1,12,28,84,153,26,04,62,025,24,17,51,331,25,20,49,087,23*79
$GPGSV,3,2,12,06,35,244,39,01,29,042,16,32,18,049,17,30,17,198,35*78
$GPGSV,3,3,12,11,13,058,,10,05,193,33,02,03,237,,24,00,321,*7B
$GPRMC,054434.000,A,3029.6517,N,11423.6204,E,0.44,84.29,040914,,,A*5B
$GPGGA,054435.000,3029.6520,N,11423.6210,E,1,09,1.2,73.7,M,-13.7,M,,0000*47
$GPGSA,A,3,17,28,20,30,32,04,01,10,06,,,,1.9,1.2,1.4*32
$GPRMC,054435.000,A,3029.6520,N,11423.6210,E,0.81,89.54,040914,,,A*55

^C
[root@root /]#

以上是监听的数据。以下是具体代码：

/*********************************************************************************
* Copyright: (C) 2014 liucehngdeng<1037398771@qq.com>
* All rights reserved.
*
* Filename: gps_test.c
* Description: This file
*
* Version: 0.0.0(09/04/2014~)
* Author: liu chengdeng <1037398771@qq.com>
* ChangeLog: 1, Release initial version on "09/04/2014 11:05:23 AM"
*
********************************************************************************/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<termios.h>
#include<string.h>

int open_dev(char *dev)
{
int fd = open( dev, O_RDWR ); //| O_NOCTTY | O_NDELAY
if (-1 == fd)
{
perror("Can't Open Serial Port !");
return -1;
}
else

return fd;
}

int init_serial(int fd,int nSpeed, int nBits, char nEvent, int nStop)
{
struct termios newtio,oldtio;
if ( tcgetattr( fd,&oldtio) != 0) {
perror("SetupSerial 1");
return -1;
}
bzero( &newtio, sizeof( newtio ) );
newtio.c_cflag |= CLOCAL | CREAD;
newtio.c_cflag &= ~CSIZE;

switch( nBits )
{
case 7:
newtio.c_cflag |= CS7;
break;
case 8:
newtio.c_cflag |= CS8;
break;
}

switch( nEvent )
{
case 'O':
newtio.c_cflag |= PARENB;
newtio.c_cflag |= PARODD;
newtio.c_iflag |= (INPCK | ISTRIP);
break;
case 'E':
newtio.c_iflag |= (INPCK | ISTRIP);
newtio.c_cflag |= PARENB;
newtio.c_cflag &= ~PARODD;
break;
case 'N':
newtio.c_cflag &= ~PARENB;
break;
}

switch( nSpeed )
{
case 2400:
cfsetispeed(&newtio, B2400);
cfsetospeed(&newtio, B2400);
break;
case 4800:
cfsetispeed(&newtio, B4800);
cfsetospeed(&newtio, B4800);
break;
case 9600:
cfsetispeed(&newtio, B9600);
cfsetospeed(&newtio, B9600);
break;
case 115200:
cfsetispeed(&newtio, B115200);
cfsetospeed(&newtio, B115200);
break;
case 460800:
cfsetispeed(&newtio, B460800);
cfsetospeed(&newtio, B460800);
break;
default:
cfsetispeed(&newtio, B9600);
cfsetospeed(&newtio, B9600);
break;
}
if( nStop == 1 )
newtio.c_cflag &= ~CSTOPB;
else if ( nStop == 2 )
newtio.c_cflag |= CSTOPB;
newtio.c_cc[VTIME] = 0;
newtio.c_cc[VMIN] = 100;
tcflush(fd,TCIFLUSH);
if((tcsetattr(fd,TCSANOW,&newtio))!=0)
{
perror("com set error");
return -1;
}

return 0;
}

int main(void)
{
int fd;
int nset1,nread;
char buf[1024];

fd = open_dev("/dev/ttyS1");


nset1 = init_serial(fd,4800, 8, 'N', 1);

  if (nset1 == -1)
exit(1);

while(1)
{
sleep(2);

memset(buf,0,1024);
nread = read(fd, buf, 1024);
if (nread > 0)
{
printf("\nGPS DATALen=%d\n",nread);
buf[nread] = '\0';
printf( "GPS information as follow:\n%s\n", buf);
}

}

close(fd);

return 0;
}

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