Statistics
| Branch: | Revision:

root / arduino-1.0 / libraries / SD / examples / Files / Files.ino @ 58d82c77

History | View | Annotate | Download (1.64 KB)

1
/*
2
  SD card basic file example
3
 
4
 This example shows how to create and destroy an SD card file 	
5
 The circuit:
6
 * SD card attached to SPI bus as follows:
7
 ** MOSI - pin 11
8
 ** MISO - pin 12
9
 ** CLK - pin 13
10
 ** CS - pin 4
11
 
12
 created   Nov 2010
13
 by David A. Mellis
14
 updated 2 Dec 2010
15
 by Tom Igoe
16
 
17
 This example code is in the public domain.
18
 	 
19
 */
20
#include <SD.h>
21

    
22
File myFile;
23

    
24
void setup()
25
{
26
  Serial.begin(9600);
27
  Serial.print("Initializing SD card...");
28
  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
29
  // Note that even if it's not used as the CS pin, the hardware SS pin 
30
  // (10 on most Arduino boards, 53 on the Mega) must be left as an output 
31
  // or the SD library functions will not work. 
32
  pinMode(10, OUTPUT);
33

    
34
  if (!SD.begin(4)) {
35
    Serial.println("initialization failed!");
36
    return;
37
  }
38
  Serial.println("initialization done.");
39

    
40
  if (SD.exists("example.txt")) {
41
    Serial.println("example.txt exists.");
42
  }
43
  else {
44
    Serial.println("example.txt doesn't exist.");
45
  }
46

    
47
  // open a new file and immediately close it:
48
  Serial.println("Creating example.txt...");
49
  myFile = SD.open("example.txt", FILE_WRITE);
50
  myFile.close();
51

    
52
  // Check to see if the file exists: 
53
  if (SD.exists("example.txt")) {
54
    Serial.println("example.txt exists.");
55
  }
56
  else {
57
    Serial.println("example.txt doesn't exist.");  
58
  }
59

    
60
  // delete the file:
61
  Serial.println("Removing example.txt...");
62
  SD.remove("example.txt");
63

    
64
  if (SD.exists("example.txt")){ 
65
    Serial.println("example.txt exists.");
66
  }
67
  else {
68
    Serial.println("example.txt doesn't exist.");  
69
  }
70
}
71

    
72
void loop()
73
{
74
  // nothing happens after setup finishes.
75
}
76

    
77

    
78