example.java

/**
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.bitalino;

import com.bitalino.comm.BITalinoDevice;
import com.bitalino.comm.BITalinoFrame;
import com.google.gson.Gson;

import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import java.io.FileWriter;
import java.util.logging.Logger;

/**
 * Example on how to work with BITalino from Java.
 */
public class BITalinoExample {

    private static final Logger logger = Logger.getLogger(BITalinoExample.class
            .getName());

    /*
     * TODO change to your device's MAC address
     */
    private static final String MAC = "20:13:08:08:15:83";

    public static void main(String[] args) throws Throwable {
        // validate MAC address
        // if (!mac.matches("^([0-9A-F]{2}[:-]){5}([0-9A-F]{2})$"))
        // throw new BITalinoException(BITalinoErrorTypes.MACADDRESS_NOT_VALID);
        final String mac = MAC.replace(":", "");

        final int samplerate = 100;
        final int[] analogs = {0};
        BITalinoDevice device = new BITalinoDevice(samplerate, analogs);

        // connect to BITalino device
        final StreamConnection conn = (StreamConnection) Connector.open("btspp://"
                + mac + ":1", Connector.READ_WRITE);
        device.open(conn.openInputStream(), conn.openOutputStream());

        // get BITalino version
        logger.info("Firmware Version: " + device.version());

        // start acquisition on predefined analog channels
        device.start();

        // read n samples
        final int numberOfSamplesToRead = 20;
        BITalinoFrame[] samplesRead = new BITalinoFrame[numberOfSamplesToRead];
        final String logFile = "bitalino_log.json";
        final FileWriter fileWriter = new FileWriter(logFile);
        logger.info("Reading " + numberOfSamplesToRead + " samples..");
        for (int counter = 0; counter < numberOfSamplesToRead; counter++) {
            final BITalinoFrame[] frames = device.read(1);
            samplesRead[counter] = frames[0];
            logger.info("FRAME: " + frames[0].toString());
            Thread.sleep(1000);
        }
        fileWriter.write(new Gson().toJson(samplesRead));
        fileWriter.close();
        logger.info("Generated " + logFile + " with frames encoded into JSON.");

        // trigger digital outputs
        // int[] digital = { 1, 1, 1, 1 };
        // device.trigger(digital);

        // stop acquisition and close bluetooth connection
        device.stop();
    }
}