File content as of revision 1:23d22ebf52c0:

//GPS GT-720F Logger01
#include "mbed.h"

#include "SDFileSystem.h"
SDFileSystem sd(p5,p6,p7,p8,"sd");
FILE* fp;


#define ON 1
#define OFF 0

DigitalOut mled0(LED1);
DigitalOut mled1(LED2);
DigitalIn sw1(p15);

Serial pc(USBTX, USBRX); // tx, rx 





Serial gps(p9,p10);
//LocalFileSystem local("local");
Ticker flipper;

float g_hokui,g_tokei;
int fp_count=0;

int h_time=0,m_time=0,s_time=0;

void gps_rec() {
  mled0=ON;
 if(fp == NULL) {
       error("Could not open file for write\n");
    }

  fprintf(fp,"%4.6f,%3.6f\r\n",g_tokei,g_hokui);
 
  
  mled0=OFF;
  fp_count++;
  

}

int main() {

      char c;
      int i,rlock=0,stn=0;
      char gps_data[256];
      char ns,ew;
      float time,hokui,tokei;
 
      float d_hokui,m_hokui,d_tokei,m_tokei;
      int h_time=0,m_time=0,s_time=0;
      int rec_flag=0;
      
      gps.baud(9600);
fp = fopen("/sd/test.csv", "w");
    //  wait(1.0);
 

 
 flipper.attach(&gps_rec, 1.0);
 
    
 //   fp = fopen("/sd/test.csv", "w");
     // fp=fopen("/local/GPS.csv","w");
   //   fp=fopen("/local/GPS.csv","w");
 //fclose(fp);
 //free(fp);

     // fprintf(fp,"\n");
      //wait(1.0);
      
    while (1) {
      /*
      pc.putc(gps.getc());
      */
      
      if(sw1!=1){
        
        fclose(fp);
       
        exit(1);    
      }
      
      i=0;
      while(gps.getc()!='$'){
      }
      
      
      while( (gps_data[i]=gps.getc()) != '\r'){
        i++;
        if(i==256){
           
           i=255;
           break;
         }
      }
      gps_data[i]='\0';
      
      //test
      /* Test data
       rlock=1;
       stn=3;
       hokui=3532.25024; //=>35.537502
       tokei=13751.86820;//=>137.864471
       time=114107.046;
      */  
      if( sscanf(gps_data, "GPGGA,%f,%f,%c,%f,%c,%d,%d",&time,&hokui,&ns,&tokei,&ew,&rlock,&stn) >= 1){
        if(rlock >= 1){

         //hokui
          d_hokui=int(hokui/100);
          m_hokui=(hokui-d_hokui*100)/60;
          g_hokui=d_hokui+m_hokui;
         //tokei
          d_tokei=int(tokei/100);
          m_tokei=(tokei-d_tokei*100)/60;
          g_tokei=d_tokei+m_tokei;
         //g_hokui=int(hokui/100)+(hokui-int(hokui/100))/60;
         //g_tokei=int(tokei/100)+(tokei-int(tokei/100))/60;
          
         //time set
          h_time=int(time/10000);
          m_time=int((time-h_time*10000)/100);
          s_time=int(time-h_time*10000-m_time*100);
          h_time=h_time+9;//UTC =>JST
          
         // Record start
          if(rec_flag==0){
            
         //  flipper.attach(&gps_rec, 1.0);
           
           rec_flag=1;
         //  fp=fopen("/local/GPS.csv","w");
          //  fprintf(fp,"%2d,%2d,%2d,%6.6f,%5.6f\r\n",h_time,m_time,s_time,g_tokei,g_hokui);
          //fclose(fp);
           //free(fp);
        
           mled0=ON;
          }  
          
        else{
          //fp=fopen("/local/GPS.csv","w");
        //  flipper.detach(); 
          rec_flag=0;
         
        }//else
        }
      }//if
    }//while
}//main