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sense/test.cpp
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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 | |
created Nov 2010 | |
by David A. Mellis | |
modified 9 Apr 2012 | |
by Tom Igoe | |
This example code is in the public domain. | |
*/ | |
#include <Wire.h> | |
#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 Leonardo 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 | |
} |