#include <SD.h>

// Using SPI1 
const int _SCK = 10;
const int _MISO = 12;
const int _MOSI = 11;
const int _CS = 13;

File sd_file; 

void setup_sd() {
  Serial.print("Initializing SD card...");

  // Ensure the SPI pinout the SD card is connected to is configured properly
  SPI1.setRX(_MISO);
  SPI1.setTX(_MOSI);
  SPI1.setSCK(_SCK);

  // see if the card is present and can be initialized:
  while (!SD.begin(_CS, SPI1)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    delay(1000); 
  } 

  Serial.println("card initialized.");
}

void sd_write(String filename, String gps_data) {
  File sd_file = SD.open(filename, FILE_WRITE);
  if (sd_file) { //if the file is available, write to it:
    sd_file.println(gps_data);
    sd_file.close();
    // print to the serial port too:
    Serial.print("Writing to SD: ");
    Serial.println(gps_data);
  } else { // if the file isn't open, pop up an error:
    Serial.println("error opening the GPX file for writing");
  }
}

void sd_read(String filename){
  // re-open the file for reading:
  File sd_file = SD.open(filename);
  if (sd_file) {
    Serial.print("Reading file ");
    Serial.println(filename);
    // read from the file until there's nothing else in it:
    while (sd_file.available()) {
      Serial.write(sd_file.read());
    }
    Serial.println("End of file");

    // close the file:
    sd_file.close();
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening ride.gpx");
  }
}