/*
   SD card read/write

   This example shows how to read and write data to and from an SD card file
   The circuit:
 * SD card attached to SPI bus as follows:
 ** MOSI - pin 11
 ** MISO - pin 12
 ** CLK - pin 13
 ** CS - pin 9

   LED on pin 5

   This example code is in the public domain.

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

#define PIN_SPI_DATA		9
#define	PIN_SPI_CHIP_SELECT	3

File myFile;

void setup()
{
	int i;
	Serial.begin(9600);
	Serial.println("\r\nHobbytronics Test Program for SD card...");
	Serial.println("Initializing 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(PIN_SPI_CHIP_SELECT, OUTPUT);
	
	if (!SD.begin(PIN_SPI_DATA)) {
		Serial.println("initialization failed!");
		return;
	}
	Serial.println("initialization done.");

	if (SD.exists("test.txt"))
		SD.remove("test.txt");

	myFile = SD.open("test.txt", FILE_WRITE);

	// if the file opened okay, write to it:
	if (myFile) {
		Serial.println("Writing to test.txt...");
		Serial.println("Hobbytronics Test");
		for(i=0; i<20; i++)
		{
			myFile.println("Hobbytronics Test of file writing");
		}

		// 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:
	Serial.println("\n\rReading from test.txt...");
	myFile = SD.open("test.txt");
	if (myFile) {

		// 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");
	}
	Serial.println("Test Complete.");
}

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