Помогите пожалуйста с кодом для работы с SDcard

Использую Arduino UNO + SD Card SHield от Seeed Studio. Не получается открыть файл с SD (16M) для чтения и выдать в COM порт. Исходник в файле 1.txt. Монитор выдает следующее сообщение:

Initializing SD card...Wiring is correct and a card is present.

Card type: SD2

Volume type is FAT16

Volume size (bytes): 1014743040
Volume size (Kbytes): 990960
Volume size (Mbytes): 967

Files found on the card (name, date and size in bytes):
DATA.TXT 2015-08-10 22:57:44 8
reading data.txt from card...
error opening data.txt from card

 

Отформатируйте код нажатием Ctrl+T в Arduino IDE, потом вставьте код на форум при помощи тэга CODE.

 

Код (Text):

/*
  SD card test

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:
  * SD card attached to SPI bus as follows:
** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
** CS - depends on your SD card shield or module.
** Pin 4 used here for consistency with other Arduino examples


created  28 Mar 2011
by Limor Fried
modified 9 Apr 2012
by Tom Igoe
*/
// include the SD library:
#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()
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }


  Serial.print("\nInitializing SD card...");
  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
  // Note that even if it's not used as the CS pin, the hardware SS pin
  // (10 on most Arduino boards, 53 on the Mega) must be left as an output
  // or the SD library functions will not work.
  pinMode(10, OUTPUT);    // change this to 53 on a mega


  // 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 is 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

  uint64_t volumesize64;
  uint32_t volumesize32;
  Serial.print("\nVolume type is FAT");
  Serial.println(volume.fatType(), DEC);
  Serial.println();

  volumesize64 = volume.blocksPerCluster();    // clusters are collections of blocks
  volumesize64 *= volume.clusterCount();      // we'll have a lot of clusters
  volumesize64 *= 512;                            // SD card blocks are always 512 bytes

  Serial.print("Volume size (bytes): ");
  printLLNumber(volumesize64, DEC);
  Serial.println();

  Serial.print("Volume size (Kbytes): ");
  volumesize32 = volumesize64 / 1024;
  Serial.println(volumesize32);

  Serial.print("Volume size (Mbytes): ");
  volumesize32 /= 1024;
  Serial.println(volumesize32);
  /*uint64_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,DEC);
  Serial.print("Volume size (Kbytes): ");
  volumesize /= 1024;
  Serial.println(volumesize,DEC);
  Serial.print("Volume size (Mbytes): ");
  volumesize /= 1024;
  Serial.println(volumesize,DEC);
  */

  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);

  //---------------------------- здесь не открывается файл -------------------------------
  Serial.println("reading data.txt from card...");
  //открываем файл "data.txt" в корневом каталоге, и если он открылся
  File dataFile = SD.open("DATA.txt");
  if (dataFile) {
    //и если он открылся в цикле до конца файла
    //читаем по одному байту из файла и выводим в COM порт
    while (dataFile.available()) {
      Serial.write(dataFile.read());
    }
    //закрываем файл
    dataFile.close();
  }
  else {
    Serial.println("error opening data.txt from card");
  }
  //------------------------------------------------------------
}


void loop(void) {

}
void printLLNumber(uint64_t n, uint8_t base)
{
  unsigned char buf[16 * sizeof(long)];
  unsigned int i = 0;

  if (n == 0)
  {
    Serial.print((char)'0');
    return;
  }

  while (n > 0)
  {
    buf[i++] = n % base;
    n /= base;
  }

  for (; i > 0; i--)
    Serial.print((char) (buf[i - 1] < 10 ?
                        '0' + buf[i - 1] :
                        'A' + buf[i - 1] - 10));
}

 

 

Менял карточки, не помогает. Карточки определяет информацию о файлах на карте выдает, но не может создать файл или открыть файл для чтения. Также пробовал вставить код ниже, выдает сообщение
Initializing SD card...Wiring is correct and a card is present.

Card type: SD2

Volume type is FAT16

Volume size (bytes): 1014743040
Volume size (Kbytes): 990960
Volume size (Mbytes): 967

Files found on the card (name, date and size in bytes):
DATA.TXT 2015-08-10 22:57:44 8
Creating example.txt...
example.txt doesn't exist.
Removing example.txt...
example.txt doesn't exist.

Код (Text):

  Serial.println("Creating example.txt...");
  myFile = SD.open("example.txt", FILE_WRITE);
  myFile.close();

  // Check to see if the file exists:
  if (SD.exists("example.txt")) {
    Serial.println("example.txt exists.");
  }
  else {
    Serial.println("example.txt doesn't exist.");
  }

  // delete the file:
  Serial.println("Removing example.txt...");
  SD.remove("example.txt");

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