arduinolog.c

/*
  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 4 (for MKRZero SD: SDCARD_SS_PIN)

 created   Nov 2010
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe

 This example code is in the public domain.

 */

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

File myFile;

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...");

  if (!SD.begin(4)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");

  myFile = SD.open("test.txt");
  if (myFile) {
    Serial.println("test.txt:");

    String sbuff="";
    int value, total=0;
    char c;
    while (myFile.available()) {
      c = myFile.read();
      if(c == '\n'){
        value = sbuff.toInt();
        total += value;
        sbuff = "";
        Serial.print("value: ");
        Serial.println(value);
      }else{
        sbuff += c;
      }
    }
    // close the file:
    myFile.close();
    Serial.print("\ntotal: ");
    Serial.println(total);
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }
}

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