Arduino Function: Audio.write

Description

This function writes an audio signal from a buffer.

Syntax

Audio.write(buffer, length);

Parameters

  • buffer (short) : the named buffer with the audio file.
  • length (int) : number of samples to write

Examples

/* 
* Demonstrates the use of the Audio library for the Arduino Due Hardware required :
* Arduino shield with a SD card on CS 4 (the Ethernet sheild will work)
* Audio amplifier circuit with speaker attached to DAC0 Original by Massimo Banzi September 20, 2012 Modified by Scott Fitzgerald October 19, 2012
*/
#include <SD.h> 
#include <SPI.h>
#include <Audio.h>
void setup()
{
  // debug output at 9600 baud
  Serial.begin(9600);
  // setup SD-card
  Serial.print("Initializing SD card...");
  if (!SD.begin(4))
  {
   Serial.println(" failed!");
   return;
  }
  Serial.println(" done.");
  // hi-speed SPI transfers
  SPI.setClockDivider(4);
  // 44100Khz stereo => 88200 sample rate
  // 100 mSec of prebuffering.
  Audio.begin(88200, 100);
}

void loop()
{
  int count=0;
  // open wave file from sdcard
  File myFile = SD.open("test.wav");
  if (!myFile)
  {
    // if the file didn't open, print an error and stop
    Serial.println("error opening test.wav");
    while (true);
  }
  const int S=1024;
  // Number of samples to read in block short buffer[S];
  Serial.print("Playing");
  // until the file is not finished
  while (myFile.available())
  {
    // read from the file into buffer
    myFile.read(buffer, sizeof(buffer));
    // Prepare samples int volume = 1024;
    Audio.prepare(buffer, S, volume);
    // Feed samples to audio Audio.write(buffer, S);
    // Every 100 block print a '.'
    count++;
    if (count == 100)
    {
      Serial.print("."); count = 0;
    }
  }
  myFile.close();
  Serial.println("End of file. Thank you for listening!");
  while (true) ;
}





Based on the reference originally written by Arduino Community,  wiring.org.co and  arduino.cc