File content as of revision 2:3d3d272d2df2:

#include "mbed.h"
#include "GPS.h"
#include <iostream>
#include <sstream>
#include <bitset>
#include <string>
#include "FATFileSystem.h"
//#include "HeapBlockDevice.h"
#include "SDBlockDevice.h"
#include <stdio.h>
#include <errno.h>

//HeapBlockDevice bd(128 * 512, 512);
//SDBlockDevice bd(PinName mosi, PinName miso, PinName sclk, PinName cs);
SDBlockDevice bd(D11, D12, D13, D10);
Serial pc(PA_2,PA_3);
Serial SIM900(PA_9,PA_10);                // (TX,RX)                                                   
GPS gps (PA_11,PA_12);

FATFileSystem fs("fs");
string result;
char x;

void return_error(int ret_val){
  if (ret_val)
    printf("Failure. %d\r\n", ret_val);
  else
    printf("done.\r\n");
}
 
void errno_error(void* ret_val){
  if (ret_val == NULL)
    printf(" Failure. %d \r\n", errno);
  else
    printf(" done.\r\n");
}

void clearString()
 {
  result.clear();
  }
 
void callback_rx() {
 
    while (SIM900.readable()) {
      x = SIM900.getc();
      result += x;
    pc.putc(x); // print the answer from SIM900
 
       }
}
void sendSMS()
{
clearString();
SIM900.printf("AT+CMGF=1\r"); //at command for send sms
wait_ms(1000);
clearString();
wait_ms(1000);
SIM900.printf("AT+CMGS=");
SIM900.putc('"');
SIM900.printf("+4917645651571");
SIM900.putc('"');
SIM900.printf("\r");
wait_ms(1000);
SIM900.printf("Latitude: %0.6f, Longitude: %0.6f,Altitude: %0.3f",gps.latitude,gps.longitude,gps.altitude);
wait_ms(1000);
SIM900.putc(0x1A);
wait_ms(5000);
}
 
int main() {
  /**/
  pc.printf("\r\n GSM 900 Test\n");
  SIM900.attach(&callback_rx);
  SIM900.baud(9600);
  wait_ms(100);
  sendSMS();
  wait_ms(100);
  /**/
  int error = 0;
  printf("Welcome to the filesystem example.\r\n"
         "Formatting a FAT, RAM-backed filesystem. ");
  error = FATFileSystem::format(&bd);
  return_error(error);
 
  printf("Mounting the filesystem on \"/fs\". ");
  error = fs.mount(&bd);
  return_error(error);
 
  printf("Opening a new file, numbers.txt.");
  FILE* fd = fopen("/fs/numbers.txt", "a+");
  errno_error(fd);
 
  //for (int i = 0; i < 20; i++){
  // printf("Writing decimal numbers to a file (%d/20)\r", i);
  //fprintf(fd, "%d\r\n", i);
  //}
   fprintf(fd,"Latitude, Longitude,Altitude,Speed in knots, Date, Time,Number of satellites being tracked, IDs of satellites ins use, Fix, Fix mode\r\n");
  //printf("Writing decimal numbers to a file (20/20) done.\r\n");
 
  printf("Closing file.");
  fclose(fd);
  printf(" done.\r\n");
 
  printf("Re-opening file read-only.");
  fd = fopen("/fs/numbers.txt", "r");
  errno_error(fd);
 
  printf("Dumping file to screen.\r\n");
  char buff[16] = {0};
  while (!feof(fd)){
    int size = fread(&buff[0], 1, 15, fd);
    fwrite(&buff[0], 1, size, stdout);
  }
  printf("EOF.\r\n");
 
  printf("Closing file.");
  fclose(fd);
  printf(" done.\r\n");
 
  printf("Opening root directory.");
  DIR* dir = opendir("/fs/");
  errno_error(fd);
 
  struct dirent* de;
  printf("Printing all filenames:\r\n");
  while((de = readdir(dir)) != NULL){
    printf("  %s\r\n", &(de->d_name)[0]);
  }
 
  printf("Closing root directory. ");
  error = closedir(dir);
  return_error(error);
  printf("Filesystem Demo complete.\r\n");
  wait(2);
  while (true) {
    pc.printf("\n");
     wait(1); 
          if(gps.sample()){
          float latitude    = gps.latitude;
          float longitude   = gps.longitude;
          float altitude    = gps.altitude;
          //float direction   =0.0;
          float utc = gps.utc+20000;
          //int sek=gps.sek;
          //int min=gps.min;
          //int hour=gps.hour;
          int sat_tracked=gps. sat_tracked;
          int fix=gps.fix;
          int fix_3d=gps.fix_3d;
          int id1=gps.id1;
          int id2=gps.id2;
          int id3=gps.id3;
          int id4=gps.id4;
          int id5=gps.id5;
          int id6=gps.id6;
          int id7=gps.id7;
          int id8=gps.id8;
          int id9=gps.id9;
          int id10=gps.id10;
          int id11=gps.id11;
          int id12=gps.id12;
          //double hdop=gps.hdop;
          //double pdop=gps.pdop;
          float speed=gps.speed;
          int   date=gps.date;
          //char aut=gps.aut;
          //float vdop=gps.vdop;
          //int chek_data=gps.check_data;
          //pc.printf("Latitude, Longitude,Altitude, Direction, Speed in knots, Date, Time, Satellites in use, Satellites in view, IDs of satellites ins use, Fix, Fix mode, PDOP, HDOP\r\n");
          //pc.printf("%0.6f,%0.6f,%0.3f,%0.2f,%0.2f,%d,%0.0f,%d,",latitude,longitude,altitude,direction,speed,date,utc, sat_tracked);
          //pc.printf("%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d,",id1,id2,id3,id4,id5,id6,id7,id8,id9,id10,id11,id12);
          //pc.printf("%d,%d,%.2f,%.2f\r\n",fix,fix_3d,pdop,hdop);
          //pc.printf("%d",date);
          pc.printf("Latitude: %0.6f\r\n",latitude);
          pc.printf("Longitude:%0.6f\r\n",longitude);
          pc.printf("Altitude: %0.3f\r\n",altitude);
          pc.printf("Speed in knots: %0.2f\r\n",speed);
          pc.printf("Date: %d\r\n",date);
          pc.printf("Time UTC: %0.0f\r\n",utc);
          pc.printf("Number of satellites being tracked: %d\r\n", sat_tracked);
          pc.printf("PRNs of satellites used for fix:\r\n");
          pc.printf("ID1:%d,ID2:%d,ID3:%d,ID4:%d,ID5:%d,ID6:%d\r\n",id1,id2,id3,id4,id5,id6);
          pc.printf("ID7:%d,ID8:%d,ID9:%d,ID10:%d,ID11:%d,ID12:%d\r\n",id7,id8,id9,id10,id11,id12);
          pc.printf("Fix quality: %d - value include 0=invalid; 1=GPS fix\r\n",fix);
          pc.printf("3D fix: %d - value include: 1 = no fix, 2 = 2D fix, 3 = 3D fix\r\n\n", fix_3d); 
          pc.printf("****************************************************************\r\n");   
          
          FILE* fd = fopen("/fs/numbers.txt", "a+");
          //errno_error(fd);
         if(fd != NULL)
         {
              printf("write file.\r\n");
              fprintf(fd,"%0.6f,%0.6f,%0.3f,%0.2f,%d,%0.0f,%d,%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d,%d,%d\r\n",latitude, longitude, altitude, speed, date, utc, sat_tracked, id1,id2,id3,id4,id5,id6,id7,id8,id9,id10,id11,id12, fix,fix_3d);
              //fclose(fd);
              printf("Closing file.\r\n");
              fclose(fd);
              printf(" done.\r\n");
         }
 
              //printf("Re-opening file read-only.");
              //fd = fopen("/fs/numbers.txt", "r");
             //errno_error(fd);
          
          wait(1);
        //for (int i = 0; i < 20; i++){
        // printf("Writing decimal numbers to a file (%d/20)\r", i);
        //fprintf(fd, "%d\r\n", i);
  //}
   //fprintf(fd,"Latitude, Longitude,Altitude,Speed in knots, Date, Time,Number of satellites being tracked, IDs of satellites ins use, Fix, Fix mode,\r\n");
  //fprintf(fd,"%0.6f,%0.6f,%0.3f,%0.2f,%d,%0.0f,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",latitude, longitude, altitude, speed, date, utc, sat_tracked, id1,id2,id3,id4,id5,id6,id7,id8,id9,id10,id11,id12, fix,fix_3d);
      }
    }
}