package com.sample.hrv.sensor;
import android.bluetooth.BluetoothGattCharacteristic;
import android.util.Log;
import static java.lang.Math.pow;
/**
* Created by by olli on 3/28/2014.
*/
public class BleHeartRateSensor extends BleSensor<float[]> {
private final static String TAG = BleHeartRateSensor.class.getSimpleName();
private static final String UUID_SENSOR_BODY_LOCATION = "00002a38-0000-1000-8000-00805f9b34fb";
private static final int SENSOR_BODY_LOCATION_OTHER = 0;
private static final int SENSOR_BODY_LOCATION_CHEST = 1;
private static final int SENSOR_BODY_LOCATION_WRIST = 2;
private static final int SENSOR_BODY_LOCATION_FINGER = 3;
private static final int SENSOR_BODY_LOCATION_HAND = 4;
private static final int SENSOR_BODY_LOCATION_EAR = 5;
private static final int SENSOR_BODY_LOCATION_FOOT = 6;
private int location = -1;
BleHeartRateSensor() {
super();
}
@Override
public String getName() {
return "Heart rate";
}
@Override
public String getServiceUUID() {
return "0000180d-0000-1000-8000-00805f9b34fb";
}
public static String getServiceUUIDString() {
return "0000180d-0000-1000-8000-00805f9b34fb";
}
@Override
public String getDataUUID() {
return "00002a37-0000-1000-8000-00805f9b34fb";
}
public static String getDataUUIDString() {
return "00002a37-0000-1000-8000-00805f9b34fb";
}
@Override
public String getConfigUUID() {
return "00002902-0000-1000-8000-00805f9b34fb";
}
@Override
public String getCharacteristicName(String uuid) {
if (UUID_SENSOR_BODY_LOCATION.equals(uuid))
return getName() + " Sensor body location";
return super.getCharacteristicName(uuid);
}
@Override
public boolean onCharacteristicRead(BluetoothGattCharacteristic c) {
super.onCharacteristicRead(c);
Log.d(TAG, "onCharacteristicsReas");
if ( !c.getUuid().toString().equals(UUID_SENSOR_BODY_LOCATION) )
return false;
location = c.getProperties();
Log.d(TAG, "Sensor body location: " + location);
return true;
}
@Override
public String getDataString() {
final float[] data = getData();
return "heart rate=" + data[0] + "\ninterval=" + data[1];
}
@Override
public float[] parse(BluetoothGattCharacteristic c) {
double heartRate = extractHeartRate(c);
double contact = extractContact(c);
double energy = extractEnergyExpended(c);
Integer[] interval = extractBeatToBeatInterval(c);
float[] result = null;
if (interval != null) {
result = new float[interval.length + 1];
} else {
result = new float[2];
result[1] = -1.0f;
}
result[0] = (float) heartRate;
if (interval != null) {
for (int i = 0; i < interval.length; i++) {
result[i+1] = interval[i].floatValue();
}
}
return result;
}
private static double extractHeartRate(
BluetoothGattCharacteristic characteristic) {
int flag = characteristic.getProperties();
Log.d(TAG, "Heart rate flag: " + flag);
int format = -1;
// Heart rate bit number format
if ((flag & 0x01) != 0) {
format = BluetoothGattCharacteristic.FORMAT_UINT16;
Log.d(TAG, "Heart rate format UINT16.");
} else {
format = BluetoothGattCharacteristic.FORMAT_UINT8;
Log.d(TAG, "Heart rate format UINT8.");
}
final int heartRate = characteristic.getIntValue(format, 1);
Log.d(TAG, String.format("Received heart rate: %d", heartRate));
return heartRate;
}
private static double extractContact(
BluetoothGattCharacteristic characteristic) {
int flag = characteristic.getProperties();
int format = -1;
// Sensor contact status
if ((flag & 0x02) != 0) {
Log.d(TAG, "Heart rate sensor contact info exists");
if ((flag & 0x04) != 0) {
Log.d(TAG, "Heart rate sensor contact is ON");
} else {
Log.d(TAG, "Heart rate sensor contact is OFF");
}
} else {
Log.d(TAG, "Heart rate sensor contact info doesn't exists");
}
//final int heartRate = characteristic.getIntValue(format, 1);
//Log.d(TAG, String.format("Received heart rate: %d", heartRate));
return 0.0d;
}
private static double extractEnergyExpended(
BluetoothGattCharacteristic characteristic) {
int flag = characteristic.getProperties();
int format = -1;
// Energy calculation status
if ((flag & 0x08) != 0) {
Log.d(TAG, "Heart rate energy calculation exists.");
} else {
Log.d(TAG, "Heart rate energy calculation doesn't exists.");
}
//final int heartRate = characteristic.getIntValue(format, 1);
//Log.d(TAG, String.format("Received heart rate: %d", heartRate));
return 0.0d;
}
private static Integer[] extractBeatToBeatInterval(
BluetoothGattCharacteristic characteristic) {
int flag = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0);
int format = -1;
int energy = -1;
int offset = 1; // This depends on hear rate value format and if there is energy data
int rr_count = 0;
if ((flag & 0x01) != 0) {
format = BluetoothGattCharacteristic.FORMAT_UINT16;
Log.d(TAG, "Heart rate format UINT16.");
offset = 3;
} else {
format = BluetoothGattCharacteristic.FORMAT_UINT8;
Log.d(TAG, "Heart rate format UINT8.");
offset = 2;
}
if ((flag & 0x08) != 0) {
// calories present
energy = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT16, offset);
offset += 2;
Log.d(TAG, "Received energy: {}"+ energy);
}
if ((flag & 0x16) != 0){
// RR stuff.
Log.d(TAG, "RR stuff found at offset: "+ offset);
Log.d(TAG, "RR length: "+ (characteristic.getValue()).length);
rr_count = ((characteristic.getValue()).length - offset) / 2;
Log.d(TAG, "RR length: "+ (characteristic.getValue()).length);
Log.d(TAG, "rr_count: "+ rr_count);
if (rr_count > 0) {
Integer[] mRr_values = new Integer[rr_count];
for (int i = 0; i < rr_count; i++) {
mRr_values[i] = characteristic.getIntValue(
BluetoothGattCharacteristic.FORMAT_UINT16, offset);
offset += 2;
Log.d(TAG, "Received RR: " + mRr_values[i]);
}
return mRr_values;
}
}
Log.d(TAG, "No RR data on this update: ");
return null;
}
}
