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====== MODULES SD CARD ======

===== PINOUTS =====
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===== SD-CARD + ARDUINO =====
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{{:documentation:microcontroleurs:arduino:modules:sdcard:sdcardarduinonano.png|}}
===== CODE =====

==== WRITING ====
<code cpp>
#include <SPI.h>
#include <SD.h>

File myFile;

void setup() {

  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
   ; // wait for serial port to connect. Needed for native USB port only
  }
  
  Serial.print("Initializing SD card...");
  
  if (!SD.begin(10)) {
  Serial.println("initialization failed!");
  while (1);
  }
  
  Serial.println("initialization done.");
  
  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  myFile = SD.open("test.txt", FILE_WRITE);

  // if the file opened okay, write to it:
  if (myFile) {
  Serial.print("Writing to test.txt...");
  myFile.println("This is a test file :)");
  myFile.println("testing 1, 2, 3.");
  
  for (int i = 0; i < 20; i++) {
    myFile.println(i);
  }

  // close the file:
  myFile.close();

  Serial.println("done.");
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }
}

void loop() {
 // nothing happens after setup
}
</code>

==== READING ====
<code cpp>
#include <SPI.h>
#include <SD.h>
File myFile;

void setup() {

  // Open serial communications and wait for port to open:
  Serial.begin(9600);

  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  Serial.print("Initializing SD card...");
  if (!SD.begin(10)) {
    Serial.println("initialization failed!");
    while (1);
  }

  Serial.println("initialization done.");

  // open the file for reading:
  myFile = SD.open("test.txt");
  
  if (myFile) {
    Serial.println("test.txt:");

    // read from the file until there's nothing else in it:
    while (myFile.available()) {
      Serial.write(myFile.read());
    }

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

void loop() {
  // nothing happens after setup
}

</code>

==== READING LINE BY LINE ====
<code cpp>
</code>