1 | /*
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2 | SD card basic file example
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3 |
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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 (for MKRZero SD: SDCARD_SS_PIN)
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11 |
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12 | created Nov 2010
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13 | by David A. Mellis
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14 | modified 9 Apr 2012
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15 | by Tom Igoe
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16 |
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17 | This example code is in the public domain.
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18 |
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19 | */
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20 | #include <SPI.h>
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21 | #include <SD.h>
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22 |
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23 | const int chipSelect = 4;
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24 |
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25 | File myFile;
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26 |
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27 | void setup() {
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28 | // Open serial communications and wait for port to open:
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29 | Serial.begin(9600);
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30 | while (!Serial) {
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31 | ; // wait for serial port to connect. Needed for native USB port only
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32 | }
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33 |
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34 | Serial.print("Initializing SD card...");
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35 |
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36 | if (!SD.begin(chipSelect)) {
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37 | Serial.println("initialization failed!");
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38 | while (1);
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39 | }
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40 | Serial.println("initialization done.");
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41 |
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42 | if (SD.exists("example.txt")) {
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43 | Serial.println("example.txt exists.");
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44 | } else {
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45 | Serial.println("example.txt doesn't exist.");
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46 | }
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47 |
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48 | // open a new file and immediately close it:
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49 | Serial.println("Creating example.txt...");
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50 | myFile = SD.open("example.txt", FILE_WRITE);
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51 | myFile.close();
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52 |
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53 | // Check to see if the file exists:
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54 | if (SD.exists("example.txt")) {
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55 | Serial.println("example.txt exists.");
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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 |
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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 |
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64 | if (SD.exists("example.txt")) {
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65 | Serial.println("example.txt exists.");
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66 | } else {
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67 | Serial.println("example.txt doesn't exist.");
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68 | }
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69 |
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70 | myFile = SD.open("/");
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71 |
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72 | printDirectory(myFile, 0);
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73 |
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74 | Serial.println("done!");
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75 | }
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76 |
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77 | void printDirectory(File dir, int numTabs) {
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78 | while (true) {
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79 |
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80 | File entry = dir.openNextFile();
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81 | if (! entry) {
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82 | // no more files
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83 | break;
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84 | }
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85 | for (uint8_t i = 0; i < numTabs; i++) {
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86 | Serial.print('\t');
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87 | }
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88 | Serial.print(entry.name());
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89 | if (entry.isDirectory()) {
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90 | Serial.println("/");
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91 | printDirectory(entry, numTabs + 1);
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92 | } else {
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93 | // files have sizes, directories do not
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94 | Serial.print("\t\t");
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95 | Serial.println(entry.size(), DEC);
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96 | }
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97 | entry.close();
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98 | }
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99 | }
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100 |
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101 |
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102 | void loop() {
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103 | // nothing happens after setup finishes.
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104 | }
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