87 lines
2.0 KiB
C++
87 lines
2.0 KiB
C++
/*
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Listfiles
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This example shows how to print out the files in a
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directory on a SD card. Pin numbers reflect the default
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SPI pins for Uno and Nano models
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The circuit:
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SD card attached to SPI bus as follows:
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** SDO - pin 11
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** SDI - pin 12
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** CLK - pin 13
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** CS - depends on your SD card shield or module.
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Pin 10 used here for consistency with other Arduino examples
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(for MKR Zero SD: SDCARD_SS_PIN)
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created Nov 2010
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by David A. Mellis
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modified 9 Apr 2012
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by Tom Igoe
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modified 2 Feb 2014
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by Scott Fitzgerald
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modified 24 July 2020
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by Tom Igoe
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This example code is in the public domain.
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*/
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#include <SD.h>
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const int chipSelect = 10;
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File root;
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void setup() {
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// Open serial communications and wait for port to open:
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Serial.begin(9600);
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// wait for Serial Monitor to connect. Needed for native USB port boards only:
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while (!Serial);
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Serial.print("Initializing SD card...");
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if (!SD.begin(chipSelect)) {
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Serial.println("initialization failed. Things to check:");
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Serial.println("1. is a card inserted?");
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Serial.println("2. is your wiring correct?");
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Serial.println("3. did you change the chipSelect pin to match your shield or module?");
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Serial.println("Note: press reset button on the board and reopen this Serial Monitor after fixing your issue!");
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while (true);
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}
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Serial.println("initialization done.");
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root = SD.open("/");
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printDirectory(root, 0);
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Serial.println("done!");
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}
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void loop() {
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// nothing happens after setup finishes.
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}
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void printDirectory(File dir, int numTabs) {
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while (true) {
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File entry = dir.openNextFile();
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if (! entry) {
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// no more files
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break;
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}
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for (uint8_t i = 0; i < numTabs; i++) {
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Serial.print('\t');
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}
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Serial.print(entry.name());
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if (entry.isDirectory()) {
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Serial.println("/");
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printDirectory(entry, numTabs + 1);
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} else {
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// files have sizes, directories do not
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Serial.print("\t\t");
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Serial.println(entry.size(), DEC);
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}
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entry.close();
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}
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}
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