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BLE: decode cadence from cycling powermeter.

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Part of #1352.
This commit is contained in:
Dennis Guse
2022-08-16 20:33:54 +02:00
parent 8696a15ce7
commit 7d804b603d
5 changed files with 88 additions and 18 deletions
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src/main/java/de/dennisguse/opentracks/sensors/BluetoothUtils.java
+36 -3
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@@ -30,8 +30,10 @@ import java.util.UUID;
import de.dennisguse.opentracks.data.models.Cadence;
import de.dennisguse.opentracks.data.models.Distance;
import de.dennisguse.opentracks.data.models.Power;
import de.dennisguse.opentracks.data.models.Speed;
import de.dennisguse.opentracks.sensors.sensorData.SensorDataCycling;
import de.dennisguse.opentracks.sensors.sensorData.SensorDataCyclingPower;
import de.dennisguse.opentracks.sensors.sensorData.SensorDataRunning;
/**
@@ -109,14 +111,45 @@ public class BluetoothUtils {
return null;
}
public static Integer parseCyclingPower(BluetoothGattCharacteristic characteristic) {
public static SensorDataCyclingPower.Data parseCyclingPower(BluetoothGattCharacteristic characteristic) {
// DOCUMENTATION https://www.bluetooth.com/wp-content/uploads/Sitecore-Media-Library/Gatt/Xml/Characteristics/org.bluetooth.characteristic.cycling_power_measurement.xml
int valueLength = characteristic.getValue().length;
if (valueLength < 4) {
if (valueLength == 0) {
return null;
}
return characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_SINT16, 2);
int index = 0;
int flags1 = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, index++);
int flags2 = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, index++);
boolean hasPedalPowerBalance = (flags1 & 0x01) > 0;
boolean hasAccumulatedTorque = (flags1 & 0x04) > 0;
boolean hasWheel = (flags1 & 16) > 0;
boolean hasCrank = (flags1 & 32) > 0;
Integer instantaneousPower = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_SINT16, index);
index += 2;
if (hasPedalPowerBalance) {
index += 1;
}
if (hasAccumulatedTorque) {
index += 2;
}
if (hasWheel) {
index += 2 + 2;
}
SensorDataCycling.CyclingCadence cadence = null;
if (hasCrank && valueLength - index >= 4) {
long crankCount = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT16, index);
index += 2;
int crankTime = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT16, index); // 1/1024s
cadence = new SensorDataCycling.CyclingCadence("", "", crankCount, crankTime);
}
return new SensorDataCyclingPower.Data(Power.of(instantaneousPower), cadence);
}
public static SensorDataCycling.CadenceAndSpeed parseCyclingCrankAndWheel(String address, String sensorName, @NonNull BluetoothGattCharacteristic characteristic) {