/*

  SD card basic file example

  This example shows how to create and destroy an SD card file

  The circuit. Pin numbers reflect the default

  SPI pins for Uno and Nano models:

   SD card attached to SPI bus as follows:

 ** SDO - pin 11

 ** SDI - pin 12

 ** CLK - pin 13

 ** CS - depends on your SD card shield or module.

        Pin 10 used here for consistency with other Arduino examples

    (for MKRZero SD: SDCARD_SS_PIN)

  created   Nov 2010

  by David A. Mellis

  modified 24 July 2020

  by Tom Igoe

  This example code is in the public domain.

*/
#include <SPI.h>
#include <SD.h>


const int chipSelect = 4;
Sd2Card card;
SdVolume volume;
SdFile root;



File myFile;

void setup() {

  // Open serial communications and wait for port to open:

  Serial.begin(9600);

  // wait for Serial Monitor to connect. Needed for native USB port boards only:
while (!Serial);

  Serial.print("Inicializando SD card...");

  if (!SD.begin(4)) {

    Serial.println("initializacao falhou!");

    while (1);

  }

  Serial.println("initialization done.");

  if (SD.exists("GiuKAz.txt")) {
    Serial.println("GiuKAz.txt exists.");
  } else {
    Serial.println("GiuKAz.txt doesn't exist.");
  }

  // open a new file and immediately close it:
  Serial.println("Creating GiuKAz.txt...");
  myFile = SD.open("GiuKAz.txt", FILE_WRITE);
	if (myFile) {

		Serial.println("GiuKAz.txt abriu_3");
		myFile.println("testando a escrita 1, 2, 3.");
		
		myFile.close();      
  } 
	


 myFile = SD.open("GiuKAz.txt");
 while (myFile.available()) {
			
      Serial.write(myFile.read()); 
			myFile.close();
    }




/*if (myFile) {

		Serial.print("Escrevendo no GiuKAz.txt...");
    myFile.println("testando a escrita 1, 2, 3.");
    //close the file:
    myFile.close();
    Serial.println("GiuKAz.txt, foi fechado apos o teste de escrita.");
    
  } 
	else {
		// if the file didn't open, print an error:
    Serial.println("error opening GiuKAz.txt no teste de escrita");
    
  }
*/



  

  // Check to see if the file exists:

  if (SD.exists("GiuKAz.txt")) {

    Serial.println("GiuKAz.txt exists, para deletar.");

  } else {

    Serial.println("GiuKAz.txt doesn't exist, para deletar.");

  }

  // delete the file:

  Serial.println("Removing GiuKAz.txt...");

  SD.remove("GiuKAz.txt");

  if (SD.exists("GiuKAz.txt")) {

    Serial.println("GiuKAz.txt exists.");

  } else {

    Serial.println("GiuKAz.txt doesn't exist.");

  }







if (!card.init(SPI_HALF_SPEED, chipSelect)) {

    Serial.println("initialization failed. Things to check:");

    Serial.println("* is a card inserted?");

    Serial.println("* is your wiring correct?");

    Serial.println("* did you change the chipSelect pin to match your shield or module?");

    while (1);

  } else {

    Serial.println("Wiring is correct and a card is present.");

  }

  // print the type of card

  Serial.println();

  Serial.print("Card type:         ");

  switch (card.type()) {

    case SD_CARD_TYPE_SD1:

      Serial.println("SD1");

      break;

    case SD_CARD_TYPE_SD2:

      Serial.println("SD2");

      break;

    case SD_CARD_TYPE_SDHC:

      Serial.println("SDHC");

      break;

    default:

      Serial.println("Unknown");

  }

  // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32

  if (!volume.init(card)) {

    Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");

    while (1);

  }

  Serial.print("Clusters:          ");

  Serial.println(volume.clusterCount());

  Serial.print("Blocks x Cluster:  ");

  Serial.println(volume.blocksPerCluster());

  Serial.print("Total Blocks:      ");

  Serial.println(volume.blocksPerCluster() * volume.clusterCount());

  Serial.println();

  // print the type and size of the first FAT-type volume

  uint32_t volumesize;

  Serial.print("Volume type is:    FAT");

  Serial.println(volume.fatType(), DEC);

  volumesize = volume.blocksPerCluster();    // clusters are collections of blocks

  volumesize *= volume.clusterCount();       // we'll have a lot of clusters

  volumesize /= 2;                           // SD card blocks are always 512 bytes (2 blocks are 1KB)

  Serial.print("Volume size (Kb):  ");

  Serial.println(volumesize);

  Serial.print("Volume size (Mb):  ");

  volumesize /= 1024;

  Serial.println(volumesize);

  Serial.print("Volume size (Gb):  ");

  Serial.println((float)volumesize / 1024.0);

  Serial.println("\nFiles found on the card (name, date and size in bytes): ");

  root.openRoot(volume);

  // list all files in the card with date and size

  root.ls(LS_R | LS_DATE | LS_SIZE);

  root.close();







}

void loop() {

  // nothing happens after setup finishes.
}