gistfile1.c

#include <SoftwareSerial.h>
#include <SdFat.h>
#include <TinyGPS.h>

//SD
const int chipSelect = 4;
// MOSI - pin 11 yellow middle
// MISO - pin 12 yellow right
// CLK - pin 13 blue
// CS - pin 4 green
SdFat sd;
SdFile myFile;

//GPS
TinyGPS gps;
SoftwareSerial uartgps(2,3);

float flat, flon, fkmph;
unsigned long fix_age;
int x, y, z, c, i, year, sats;
byte month, day, hour, minute, second, hundredths;


void setup() {
  i = 0;
  Serial.begin(115200);
  uartgps.begin(4800);
  
  // Initialize SdFat or print a detailed error message and halt
  // Use half speed like the native library.
  // change to SPI_FULL_SPEED for more performance.
  if (!sd.begin(chipSelect, SPI_HALF_SPEED)) sd.initErrorHalt();
  
}

void loop() {
  
  //read in GPS data
  while(uartgps.available()){
    c = uartgps.read();
  
    if(gps.encode(c)){
      gps.f_get_position(&flat, &flon);
      gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &fix_age);
      fkmph = gps.f_speed_kmph();
      sats = gps.satellites();
    }
  }
    
  
      
  //printing
  if(i > 19200){
    //reset counter
    i = 0;
     
    // open the file for write at end like the Native SD library
    if (!myFile.open("data.txt", O_RDWR | O_CREAT | O_AT_END)) {
      sd.errorHalt("opening data.txt for write failed");
    }
 
    //print      
    myFile.print(flat, DEC); 
    myFile.print(",");
    myFile.print(flon, DEC); 
    myFile.print(",");
    myFile.print(fkmph);
    myFile.print(",");
    myFile.print(hour, DEC); 
    myFile.print(":");
    myFile.print(minute, DEC); 
    myFile.print(":");
    myFile.print(second, DEC); 
    myFile.print(",");
        
    if (fix_age == TinyGPS::GPS_INVALID_AGE){
         myFile.print("fix_age_error");
    }else{
         myFile.print(fix_age);
    }
    myFile.print(",");
    myFile.print(sats);
    myFile.println();
    
  
    
    //close SD file
    myFile.close();   
  }
  
    x = analogRead(A0);
    y = analogRead(A1);
    z = analogRead(A2);
    Serial.print(x); Serial.print(y); Serial.println(z);
  
  i++;
}