/*

  SD card test

 要注意SD記憶卡不同、SD卡模組不同、arduino主機板不同，都有可能造成錯誤訊息

  * 由上而下

  * GND - 可接可不接

  * +3 - 不接

  * +5 - pin +5

  * CS   - pin  4   (42)

  * MOSI - pin 11   (51)

  * SCK  - pin 13   (52)

  * MISO - pin 12   (50)

  * GND - pin GND

*/

#include <SPI.h>

#include <SD.h>

File myFile;

void setup() {

  pinMode(10,OUTPUT);    //保留pin10, SD Library需要使用

  // 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(4)) {

    Serial.println("initialization failed!");

    return;

  }

  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("testing 1, 2, 3.");

    // close the file:

    myFile.close();

    Serial.println("done.");

  } else {

    // if the file didn't open, print an error:

    Serial.println("error opening test.txt");

  }

  // re-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

}

/*

  SD card test

 要注意SD記憶卡不同、SD卡模組不同、arduino主機板不同，都有可能造成錯誤訊息

 This example shows how use the utility libraries on which the'

 SD library is based in order to get info about your SD card.

 Very useful for testing a card when you're not sure whether its working or not.

 The circuit:

  * 由上而下

  * GND - 可接可不接

  * +3 - 不接

  * +5 - pin +5

  * CS   - pin  4   (42)

  * MOSI - pin 11   (51)

  * SCK  - pin 13   (52)

  * MISO - pin 12   (50)

  * GND - pin GND

*/

#include <SPI.h>

#include <SD.h>

// set up variables using the SD utility library functions:

Sd2Card card;

SdVolume volume;

SdFile root;

// change this to match your SD shield or module;

// Arduino Ethernet shield: pin 4

// Adafruit SD shields and modules: pin 10

// Sparkfun SD shield: pin 8

const int chipSelect = 4;

void setup() {

  pinMode(10,OUTPUT);    //保留pin10, SD Library需要使用

  // 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("\nInitializing SD card...");

  // we'll use the initialization code from the utility libraries

  // since we're just testing if the card is working!

  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?");

    return;

  } else {

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

  }

  // print the type of card

  Serial.print("\nCard 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");

    return;

  }

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

  uint32_t volumesize;

  Serial.print("\nVolume type is FAT");

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

  Serial.println();

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

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

  volumesize *= 512;                            // SD card blocks are always 512 bytes

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

  Serial.println(volumesize);

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

  volumesize /= 1024;

  Serial.println(volumesize);

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

  volumesize /= 1024;

  Serial.println(volumesize);

  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);

}

void loop(void) {

}

/*SD卡

CS   --> to Arduino pin4 

SCK  --> to Arduino pin13

MOSI --> to Arduino pin11

MISO --> to Arduino pin12

VCC  --> to Arduino 5V

GND  --> to Arduino GND

*/

#include <SPI.h>

#include <SD.h>

File myFile;

String filename = "test.txt";     //要寫入的檔案名稱

int i = 0;

int ledG = 7; // 綠燈 正極 --> pin 7,  負極 --> GND 

int ledR = 8; // 紅燈 正極 --> pin 8,  負極 --> GND 

void setup() {

  pinMode(ledR, OUTPUT); 

  pinMode(ledG, OUTPUT);

  pinMode(10,OUTPUT);    //保留pin10, SD Library需要使用

  Serial.begin(9600);

  while (!Serial) {}

  digitalWrite(ledR, HIGH);

  Serial.print("Initializing SD card...");  //SD卡初始化

  if (!SD.begin(4)) {

    Serial.println("initialization failed!");

    return;

  }

  Serial.println("initialization done.");

}

void loop()

{

  digitalWrite(ledG, HIGH);

  digitalWrite(ledR, LOW);

  /*

   此範圍可以加入其他程式碼

  */

  delay (3000);

  for (int i=0; i <= 10; i++){   //燈號警告，此段時間可以關閉電源、再拔除SD卡。

    digitalWrite(ledG, HIGH);

    delay(100);

    digitalWrite(ledG, LOW);

    delay(100);

  } 

  digitalWrite(ledR, HIGH);     //下面的程式是寫入SD卡，此段時間內請勿關閉電源、拔取SD卡。

  myFile = SD.open(filename, FILE_WRITE);

  if (myFile) {

    Serial.print("Writing to test.txt...");

    myFile.print(millis());                   //寫入SD卡的時間，單位是1/1000秒。

    myFile.print(",");

    myFile.print("testing 1, 2, 3");    //要寫入SD卡數據時，這一行請刪掉。

    //myFile.print(0);                  //要寫入SD卡數據時，請以逗號分隔數據。

    //myFile.print(",");

    //myFile.print(1);

    //myFile.print(",");

    //myFile.print(2);

    // ...

    myFile.println();

    // close the file:

    myFile.close();

    Serial.println("done.");

  } else {

    // if the file didn't open, print an error:

    Serial.println("error opening test.txt");

  }

  delay (3000);

}