Android Open Source - AndroidToArduino Data

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License

The source code is released under:

MIT License

Java Source Code

package com.borderlessdesignsga.matrix;
//from   w  w w  .  j av  a 2  s. c  om
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;

import java.util.Arrays;

/**
 * Created by Wes on 9/19/2014.
 */
public class Data {

    public static final byte LOW = 0;
    public static final byte HIGH = 127;

    public enum Protocol {
        UART, I2C, CUSTOM
    }

    private Protocol protocol;
    private int baud;

    public Data()
    {
        this(Protocol.UART, 2400);
    }

    public Data(Protocol protocol)
    {
        this(protocol, 2400);
    }

    public Data(int baud)
    {
        this(Protocol.UART, baud);
    }

    public Data(Protocol protocol, int baud)
    {
        this.protocol = protocol;
        this.baud = (baud > 4800) ? 4800 : baud;
    }

    public boolean send(int data, byte bitLength)
    {
        /*build audio sample based off of needed data and set protocol and baud
        will use helper functions so users can easily override this function
        for CUSTOM protocol*/

        byte bitCount;
        int bufferSize;
        int channels;
        AudioTrack track;

        switch(protocol)
        {
            case UART:
                bitCount = 10; // 8 data bits, no parity, 1 stop bit
                bufferSize = bitLength * bitCount;
                channels = AudioFormat.CHANNEL_OUT_MONO;
                break;
            case I2C:
                bitCount = 69; //pretty rough estimate, but I think this is the right bit count
                bufferSize = bitLength * bitCount * 2;
                channels = AudioFormat.CHANNEL_OUT_STEREO;
                break;
            case CUSTOM:
                bitCount = 8; //not sure yet to be honest
                bufferSize = bitLength * bitCount * 2;
                channels = AudioFormat.CHANNEL_OUT_STEREO;
                break;
            default:
                return false;
        }

        byte buffer[] = new byte[bufferSize];

        //UART fill with byte equal to 170 (to be checked on scope)

        for(byte i = 0; i < 10; i++)
        {
            int start = i * bitLength;

            if(i == 0) {
                Arrays.fill(buffer, start, start + bitLength, LOW);
            }
            else if(i == 9) {
                Arrays.fill(buffer, start, start + bitLength, HIGH);
            }
            else {
                if(i % 2 == 0) //even
                {
                    Arrays.fill(buffer, start, start + bitLength, LOW);
                }
                else
                {
                    Arrays.fill(buffer, start, start + bitLength, HIGH);
                }
            }
        }

        /*create AudioTrack and play sample via proper methods
        also abstracted to helper method*/
        try {
            track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, channels, AudioFormat.ENCODING_PCM_8BIT, bufferSize, AudioTrack.MODE_STREAM);
        } catch (IllegalArgumentException e) {
            return false;
        }

        //possibly need to call reloadStaticData() method here
        int status = track.write(buffer, 0, buffer.length);
        if(status == AudioTrack.ERROR_BAD_VALUE || status == AudioTrack.ERROR_INVALID_OPERATION) { return false; }

        try {
            //play and then immediately release the track cause we're all done here!
            track.play();
            track.release();
        } catch (IllegalArgumentException e) {
            return false;
        }

        return true;
    }

    //reading from Arduino will go here... send first priority though

    public Protocol getProtocol()
    {
        return protocol;
    }

    public int getSpeed()
    {
        return baud;
    }
}

Java Source Code List

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