Android Open Source - BLE-Heart-rate-variability-demo Ble Sensor Utils

From Project

Back to project page BLE-Heart-rate-variability-demo.

License

The source code is released under:

MIT License

If you think the Android project BLE-Heart-rate-variability-demo listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package com.sample.hrv.sensor;
/*from ww w . j  a  v  a 2s  . co  m*/
import android.bluetooth.BluetoothGattCharacteristic;

import static android.bluetooth.BluetoothGattCharacteristic.FORMAT_SINT8;
import static android.bluetooth.BluetoothGattCharacteristic.FORMAT_UINT8;

/**
 * Created by steven on 9/23/13.
 * Modified by olli on 3/28/2014.
 */
public class BleSensorUtils {

    private BleSensorUtils() {
    }

    /**
     * Gyroscope, Magnetometer, Barometer, IR temperature
     * all store 16 bit two's complement values in the awkward format
     * LSB MSB, which cannot be directly parsed as getIntValue(FORMAT_SINT16, offset)
     * because the bytes are stored in the "wrong" direction.
     *
     * This function extracts these 16 bit two's complement values.
     * */
    public static Integer shortSignedAtOffset(BluetoothGattCharacteristic c, int offset) {
        Integer lowerByte = c.getIntValue(FORMAT_UINT8, offset);
        if (lowerByte == null)
            return 0;
        Integer upperByte = c.getIntValue(FORMAT_SINT8, offset + 1); // Note: interpret MSB as signed.
        if (upperByte == null)
            return 0;

        return (upperByte << 8) + lowerByte;
    }

    public static Integer shortUnsignedAtOffset(BluetoothGattCharacteristic c, int offset) {
        Integer lowerByte = c.getIntValue(FORMAT_UINT8, offset);
        if (lowerByte == null)
            return 0;
        Integer upperByte = c.getIntValue(FORMAT_UINT8, offset + 1); // Note: interpret MSB as unsigned.
        if (upperByte == null)
            return 0;

        return (upperByte << 8) + lowerByte;
    }
}

Java Source Code List