[136] | 1 | /*
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| 2 | Simple Audio Player
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| 3 |
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| 4 | Demonstrates the use of the Audio library for the Arduino Due
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| 5 |
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| 6 | Hardware required :
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| 7 | * Arduino shield with a SD card on CS4
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| 8 | * A sound file named "test.wav" in the root directory of the SD card
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| 9 | * An audio amplifier to connect to the DAC0 and ground
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| 10 | * A speaker to connect to the audio amplifier
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| 11 |
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| 12 | Original by Massimo Banzi September 20, 2012
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| 13 | Modified by Scott Fitzgerald October 19, 2012
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| 14 |
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| 15 | This example code is in the public domain
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| 16 |
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| 17 | http://arduino.cc/en/Tutorial/SimpleAudioPlayer
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| 18 |
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| 19 | */
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| 20 |
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| 21 | #include <SD.h>
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| 22 | #include <SPI.h>
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| 23 | #include <Audio.h>
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| 24 |
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| 25 | void setup()
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| 26 | {
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| 27 | // debug output at 9600 baud
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| 28 | Serial.begin(9600);
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| 29 |
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| 30 | // setup SD-card
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| 31 | Serial.print("Initializing SD card...");
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| 32 | if (!SD.begin(4)) {
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| 33 | Serial.println(" failed!");
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| 34 | return;
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| 35 | }
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| 36 | Serial.println(" done.");
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| 37 | // hi-speed SPI transfers
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| 38 | SPI.setClockDivider(4);
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| 39 |
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| 40 | // 44100Khz stereo => 88200 sample rate
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| 41 | // 100 mSec of prebuffering.
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| 42 | Audio.begin(88200, 100);
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| 43 | }
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| 44 |
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| 45 | void loop()
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| 46 | {
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| 47 | int count = 0;
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| 48 |
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| 49 | // open wave file from sdcard
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| 50 | File myFile = SD.open("test.wav");
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| 51 | if (!myFile) {
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| 52 | // if the file didn't open, print an error and stop
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| 53 | Serial.println("error opening test.wav");
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| 54 | while (true);
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| 55 | }
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| 56 |
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| 57 | const int S = 1024; // Number of samples to read in block
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| 58 | short buffer[S];
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| 59 |
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| 60 | Serial.print("Playing");
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| 61 | // until the file is not finished
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| 62 | while (myFile.available()) {
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| 63 | // read from the file into buffer
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| 64 | myFile.read(buffer, sizeof(buffer));
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| 65 |
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| 66 | // Prepare samples
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| 67 | int volume = 1024;
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| 68 | Audio.prepare(buffer, S, volume);
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| 69 | // Feed samples to audio
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| 70 | Audio.write(buffer, S);
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| 71 |
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| 72 | // Every 100 block print a '.'
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| 73 | count++;
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| 74 | if (count == 100) {
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| 75 | Serial.print(".");
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| 76 | count = 0;
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| 77 | }
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| 78 | }
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| 79 | myFile.close();
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| 80 |
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| 81 | Serial.println("End of file. Thank you for listening!");
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| 82 | while (true) ;
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| 83 | }
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| 84 |
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