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Linux下串口GPS设备的GPRMC数据处理

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#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>
 
struct gps_info
{
       	double utc_time;
        char status;
        double latitude_value;
        char latitude;
        double longtitude_value;
        char longtitude;
        double utc_data;
}rmc_info;//GPRMC数据
 
int set_opt(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;//重要
	newtio.c_cc[VMIN] = 100;//返回的最小值  重要
 
/*	newtio.c_cc[VTIME] = 30;    //30 seconds
    newtio.c_cc[VMIN] = 100;     //least bytes
    newtio.c_lflag &= ~(ICANON|ECHO|ECHOE|ISIG);//非规范模式
 
	newtio.c_cc[VTIME] = 30;    //30 seconds
	newtio.c_cc[VTIME] = 3;    //3 seconds
*/
	tcflush(fd,TCIFLUSH);
	if((tcsetattr(fd,TCSANOW,&newtio))!=0)
	{
		perror("com set error");
		return -1;
	}
	printf("set done!\n\r");
	return 0;
}
 
int main()
{
	int i;
	int fd_gps;
	int set_gps;
	int nread_gps;
	char tmp;
	char *buff_gps;
	char *rmc_str;
 
	fd_gps=open("/dev/ttyUSB0", O_RDWR|O_NONBLOCK);//打开串口
	if (fd_gps==-1)
		exit(1);
 
	set_gps=set_opt(fd_gps,4800,8,'N',1);//设置串口属性
	if (set_gps==-1)
		exit(1);
 
while(1)
	{
		memset(buff_gps,0,512);
		nread_gps=read(fd_gps,buff_gps,512);//读串口
		printf("%s\n\n\n",buff_gps);
		if (nread_gps>0)
		{
			if((rmc_str = strstr(buff_gps, "$GPRMC"))!= NULL)
				{
					for (i=0;i<strlen(rmc_str);i++)
						{
							if (rmc_str[i] == '\n')
								{
								rmc_str[i] = '\0'; //replace ‘\n’ with null
								}
						 }
printf("%s\n",rmc_str);
				}//end of if
		//$GPRMC,030111.085,V,0000.0000,N,00000.0000,E,,0.00,150209,,,N*68
		//E,123456,0.00, 逗号中间有数据
		//sscanf(rmc_str,"%*[^,],%lf,%c,%lf,%c,%lf,%c,%*[^,],%*[^,],%lf",&rmc_info.utc_time,&rmc_info.status,&rmc_info.latitude_value,&rmc_info.latitude,&rmc_info.longtitude_value,&rmc_info.longtitude,&rmc_info.utc_data);
		//E,,0.00, 逗号中间没有数据
 
 
sscanf(rmc_str,"%*[^,],%lf,%c,%lf,%c,%lf,%c,,%*[^,],%lf",&rmc_info.utc_time,&rmc_info.status,&rmc_info.latitude_value,&rmc_info.latitude,&rmc_info.longtitude_value,&rmc_info.longtitude,&rmc_info.utc_data);
 
		printf("utc time :%lf\n",rmc_info.utc_time);
		printf("status :%c\n",rmc_info.status);
		printf("latitude :%c\n",rmc_info.latitude);
		printf("latitude value: %lf\n",rmc_info.latitude_value);
		printf("longtitude :%c\n",rmc_info.longtitude);
		printf("longtitude value: %lf\n",rmc_info.longtitude_value);
		printf("utc data :%lf\n",rmc_info.utc_data);
		}
		sleep(1);//睡眠
	}
	close(fd_gps);
	return 0;
}

Written by liby

五月 20th, 2012 at 10:03 上午

Posted in 技事巧事

Tagged with ,

留个记号

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#!/bin/bash
a=$1
b=$2
echo "$a,$b"
if [ $a -gt $b ]
then
echo "$a>$b"
else
echo "$b>$a"
fi
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#!/bin/bash
folder=$PWD
echo "$folder"
count=0
for files in *
do
if
[ -f "$files" ]
then
count=`expr $count + 1`
fi
done
echo $count
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#!/bin/bash
echo -n "input number:"
read num
nbak=$num
i=0
reverse=""
while [ $nbak -ne 0 ]
do
i=$[ $nbak % 10]
nbak=$[ $nbak / 10]
reverse="$reverse$i"
done
echo "$reverse"
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#!/bin/bash
if [ $1 = "" ] || [ $2 =  ""]
then
echo "enter parameter"
exit 1
fi
source=$PWD/$1
desert=$2
echo "$source move to $desert"
if [ -e $desert$1 ]
then
until [ !-e $desert$1 ]
do
echo "files has been deleted"
done
else
mv $PWD/$1 $desert/$1
fi

Written by liby

四月 11th, 2012 at 3:10 下午

Posted in 技事巧事

Tagged with ,

并发TCP服务器端与客户端

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
 
#define PORT_SERVER 9898
 
int main()
{
	int socket_fd,fd;
	int nread;
	int size;
	char buffer[1024];
	struct sockaddr_in ad_s,ad_c;
 
 
	if((socket_fd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		fprintf(stderr,"socket error\n");
		exit(1);
	}
 
	bzero(&ad_s,sizeof(ad_s));
	ad_s.sin_family=AF_INET;
	ad_s.sin_addr.s_addr=htonl(INADDR_ANY);
	ad_s.sin_port=htons(PORT_SERVER);
 
	if(bind(socket_fd,(struct sockaddr *)&ad_s,sizeof(ad_s))==-1)
	{
		fprintf(stderr,"bind error\n");
		exit(1);
	}
 
	if(listen(socket_fd,5)==-1)
	{
		fprintf(stderr,"listen error\n");
		exit(1);
	}
 
	while(1)
	{
		size=sizeof(struct sockaddr_in);
		bzero(buffer,1024);
		if((fd=accept(socket_fd,(struct sockaddr *)&ad_c,&size))==-1)
		{
			fprintf(stderr,"accept error\n");
			exit(1);
		}
		printf("server connect from %s\n",inet_ntoa(ad_c.sin_addr.s_addr));
		if(fork()==0)
		{
		if((nread=read(fd,buffer,1024))==-1)
		{
			fprintf(stderr,"read error\n");
			exit(1);
		}
		buffer[nread]='\0';
		printf("server receive %s\n",buffer);
		exit(0);
		}
		else
			close(fd);
	}
	close(socket_fd);
	exit(0);
}
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
 
#define PORT_CLIENT 9898
 
int main(int argv,char *argc[])
{
	struct hostent *host;
	if(argv<2)
	{
		perror("parameter error\n");
		exit(1);
	}
	if((host=gethostbyname(argc[1]))==NULL)
	{
		fprintf(stderr,"gethostname error\n");
		exit(1);
	}
 
	int sock_fd;
	struct sockaddr_in ad_s;
	char buffer[1024];
 
	if((sock_fd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		fprintf(stderr,"socket error\n");
		exit(1);
	}
	bzero(&ad_s,sizeof(ad_s));
	ad_s.sin_family=AF_INET;
	ad_s.sin_port=htons(PORT_CLIENT);
	ad_s.sin_addr=*((struct in_addr*)host->h_addr);
 
	if(connect(sock_fd,(struct sockaddr *)&ad_s,sizeof(ad_s))==-1)
	{
		fprintf(stderr,"connect error\n");
		exit(1);
	}
	printf("input something...\n");
	bzero(buffer,1024);
	fgets(buffer,1024,stdin);
	write(sock_fd,buffer,strlen(buffer));
 
	close(sock_fd);
	exit(0);
}

Written by liby

三月 10th, 2012 at 7:51 下午

Posted in 技事巧事

Tagged with ,

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