@Override
public boolean isValid(byte[] buffer) {
// Check STX (Start of Text), ETX (End of Text) and CRC Checksum
return buffer.length > ZEPHYR_HXM_BYTE_ETX
&& buffer[ZEPHYR_HXM_BYTE_STX] == 0x02
&& buffer[ZEPHYR_HXM_BYTE_ETX] == 0x03
&& SensorUtils.getCrc8(buffer, 3, 55) == buffer[ZEPHYR_HXM_BYTE_CRC];
}
private void setCadence(Sensor.SensorDataSet.Builder sds, byte[] buffer) {
// Device Firmware ID, Firmware Version, Hardware ID, Hardware Version
// 0x1A00316550003162 produces erroneous values for Cadence and needs
// a workaround based on the stride counter.
// Firmware values range from field 3 to 10 (inclusive) of the byte buffer.
byte[] hardwareFirmwareId = ApiAdapterFactory.getApiAdapter().copyByteArray(buffer, 3, 11);
Sensor.SensorData.Builder cadence = Sensor.SensorData.newBuilder();
if (Arrays.equals(hardwareFirmwareId, CADENCE_BUG_FW_ID)) {
if (strideReadings == null) {
strideReadings = new StrideReadings();
}
strideReadings.updateStrideReading(buffer[54] & 0xFF);
if (strideReadings.getCadence() != StrideReadings.CADENCE_NOT_AVAILABLE) {
cadence.setValue(strideReadings.getCadence()).setState(Sensor.SensorState.SENDING);
}
} else {
cadence
.setValue(SensorUtils.unsignedShortToIntLittleEndian(buffer, 56) / 16)
.setState(Sensor.SensorState.SENDING);
}
sds.setCadence(cadence);
}
