Arduino, SD-Karte, blockweises lesen

/*

   SD card file dump

  This example shows how to read a file from the SD card using the

  SD library and send it over the serial port.

  The circuit:

  * SD card attached to SPI bus as follows:

  ** MOSI - pin 11

  ** MISO - pin 12

  ** CLK - pin 13

  ** CS - pin 4

  created  22 December 2010

  by Limor Fried

  modified 9 Apr 2012

  by Tom Igoe

  This example code is in the public domain.

  */

#include <SPI.h>

#include <SD.h>

 const int chipSelect = 4;

uint8_t my_buffer[512];

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...");

   // see if the card is present and can be initialized:

   if (!SD.begin(chipSelect)) {

     Serial.println("Card failed, or not present");

     // don't do anything more:

     return;

   }

   Serial.println("card initialized.");

   // open the file. note that only one file can be open at a time,

   // so you have to close this one before opening another.

   File dataFile = SD.open("datalog.txt");

   // if the file is available, write to it:

   if (dataFile) {

     while (dataFile.available()>=512) {

       dataFile.read_bytes(my_buffer, 512);

       // sent data to DSP HERE

       // TODO!

     }

     dataFile.close();

   }

   // if the file isn't open, pop up an error:

   else {

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

   }

}

void loop() {

}