root / arduino-1.0 / libraries / SD / examples / Files / Files.ino @ 58d82c77
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1 | 58d82c77 | Tom Mullins | /* |
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2 | SD card basic file example |
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3 | |||
4 | This example shows how to create and destroy an SD card file |
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5 | The circuit: |
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6 | * SD card attached to SPI bus as follows: |
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7 | ** MOSI - pin 11 |
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8 | ** MISO - pin 12 |
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9 | ** CLK - pin 13 |
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10 | ** CS - pin 4 |
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11 | |||
12 | created Nov 2010 |
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13 | by David A. Mellis |
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14 | updated 2 Dec 2010 |
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15 | by Tom Igoe |
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16 | |||
17 | This example code is in the public domain. |
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18 | |||
19 | */ |
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20 | #include <SD.h> |
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21 | |||
22 | File myFile; |
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23 | |||
24 | void setup() |
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25 | { |
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26 | Serial.begin(9600); |
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27 | Serial.print("Initializing SD card..."); |
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28 | // On the Ethernet Shield, CS is pin 4. It's set as an output by default. |
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29 | // Note that even if it's not used as the CS pin, the hardware SS pin |
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30 | // (10 on most Arduino boards, 53 on the Mega) must be left as an output |
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31 | // or the SD library functions will not work. |
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32 | pinMode(10, OUTPUT); |
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33 | |||
34 | if (!SD.begin(4)) { |
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35 | Serial.println("initialization failed!"); |
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36 | return; |
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37 | } |
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38 | Serial.println("initialization done."); |
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39 | |||
40 | if (SD.exists("example.txt")) { |
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41 | Serial.println("example.txt exists."); |
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42 | } |
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43 | else { |
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44 | Serial.println("example.txt doesn't exist."); |
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45 | } |
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46 | |||
47 | // open a new file and immediately close it: |
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48 | Serial.println("Creating example.txt..."); |
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49 | myFile = SD.open("example.txt", FILE_WRITE); |
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50 | myFile.close(); |
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51 | |||
52 | // Check to see if the file exists: |
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53 | if (SD.exists("example.txt")) { |
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54 | Serial.println("example.txt exists."); |
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55 | } |
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56 | else { |
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57 | Serial.println("example.txt doesn't exist."); |
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58 | } |
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59 | |||
60 | // delete the file: |
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61 | Serial.println("Removing example.txt..."); |
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62 | SD.remove("example.txt"); |
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63 | |||
64 | if (SD.exists("example.txt")){ |
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65 | Serial.println("example.txt exists."); |
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66 | } |
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67 | else { |
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68 | Serial.println("example.txt doesn't exist."); |
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69 | } |
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70 | } |
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71 | |||
72 | void loop() |
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73 | { |
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74 | // nothing happens after setup finishes. |
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75 | } |
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76 | |||
77 |