#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/signal.h>
//#include "types.h"
#include "gps.h"
#define USE_BEIJING_TIMEZONE
static int GetComma(int num,char* str);
static void UTC2BTC(date_time *GPS);
static double get_double_number(char *s);
void show_gps(GPS_INFO *GPS)
{
printf("DATE : %ld-%02d-%02d \n",GPS->D.year,GPS->D.month,GPS->D.day);
printf("TIME : %02d:%02d:%02d \n",GPS->D.hour,GPS->D.minute,GPS->D.second);
printf("Latitude : %10.4f %c\n",GPS->latitude,GPS->NS);
printf("Longitude: %10.4f %c\n",GPS->longitude,GPS->EW);
printf("high : %10.4f \n",GPS->high);
printf("STATUS : %c\n",GPS->status);
}
////////////////////////////////////////////////////////////////////////////////
//解释gps发出的数据
//0 7 0 4 6 0 6 8 0 90 0 3 0 9
//$GPRMC,091400,A,3958.9870,N,11620.3278,E,000.0,000.0,120302,005.6,W*62
//$GPGGA,091400,3958.9870,N,11620.3278,E,1,03,1.9,114.2,M,-8.3,M,,*5E
void gps_parse(char *line,GPS_INFO *GPS)
////////////////////////////////////////////////////////////////////////////////
{
int i,tmp,start,end;
char c;
char* buf=line;
c=buf[5];
if(c=='C'){//"GPRMC"
GPS->D.hour =(buf[ 7]-'0')*10+(buf[ 8]-'0');
GPS->D.minute =(buf[ 9]-'0')*10+(buf[10]-'0');
GPS->D.second =(buf[11]-'0')*10+(buf[12]-'0');
tmp = GetComma(9,buf);
GPS->D.day =(buf[tmp+0]-'0')*10+(buf[tmp+1]-'0');
GPS->D.month =(buf[tmp+2]-'0')*10+(buf[tmp+3]-'0');
GPS->D.year =(buf[tmp+4]-'0')*10+(buf[tmp+5]-'0')+2000;
//------------------------------
GPS->status =buf[GetComma(2,buf)];
GPS->latitude =get_double_number(&buf[GetComma(3,buf)]);
GPS->NS =buf[GetComma(4,buf)];
GPS->longitude=get_double_number(&buf[GetComma(5,buf)]);
GPS->EW =buf[GetComma(6,buf)];
#ifdef USE_BEIJING_TIMEZONE
UTC2BTC(&GPS->D);
#endif
}
if(c=='A'){ //"$GPGGA"
GPS->high = get_double_number(&buf[GetComma(9,buf)]);
}
}
static double get_double_number(char *s)
{
char buf[128];
int i;
double rev;
i=GetComma(1,s);
strncpy(buf,s,i);
buf[i]=0;
rev=atof(buf);
// printf("s=%s ,buf= %s,val= %f\n",s,buf,rev);
return rev;
}
////////////////////////////////////////////////////////////////////////////////
//得到指定序号的逗号位置
static int GetComma(int num,char *str)
{
int i,j=0;
int len=strlen(str);
for(i=0;i<len;i++)
{
if(str[i]==',')j++;
if(j==num)return i+1;
}
return 0;
}
//#ifdef USE_BEIJING_TIMEZONE
////////////////////////////////////////////////////////////////////////////////
//将世界时转换为北京时
static void UTC2BTC(date_time *GPS)
{
//***************************************************
//如果秒号先出,再出时间数据,则将时间数据+1秒
GPS->second++; //加一秒
if(GPS->second>59){
GPS->second=0;
GPS->minute++;
if(GPS->minute>59){
GPS->minute=0;
GPS->hour++;
}
}
//***************************************************
GPS->hour+=8;
if(GPS->hour>23)
{
GPS->hour-=24;
GPS->day+=1;
if(GPS->month==2 ||
GPS->month==4 ||
GPS->month==6 ||
GPS->month==9 ||
GPS->month==11 ){
if(GPS->day>30){
GPS->day=1;
GPS->month++;
}
}
else{
if(GPS->day>31){
GPS->day=1;
GPS->month++;
}
}
if(GPS->year % 4 == 0 ){//
if(GPS->day > 29 && GPS->month ==2){
GPS->day=1;
GPS->month++;
}
}
else{
if(GPS->day>28 &&GPS->month ==2){
GPS->day=1;
GPS->month++;
}
}
if(GPS->month>12){
GPS->month-=12;
GPS->year++;
}
}
}
