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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;
} |