/// <summary>
/// Reads calibration information from BMP280.
/// </summary>
/// <returns>Task.</returns>
private async Task <BMP280CalibrationInformation> ReadCalibrationInformation()
{
// Read information from I2C device.
var information = new BMP280CalibrationInformation
{
// Read temperatur calibration information
Temperatur1 = ReadUIntFromLittleEndian(REGISTER_DIGIT_TEMPERATUR_1),
Temperatur2 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_TEMPERATUR_2),
Temperatur3 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_TEMPERATUR_3),
// Read pressure calibration information.
Pressure1 = ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_1),
Pressure2 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_2),
Pressure3 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_3),
Pressure4 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_4),
Pressure5 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_5),
Pressure6 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_6),
Pressure7 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_7),
Pressure8 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_8),
Pressure9 = (short)ReadUIntFromLittleEndian(REGISTER_DIGIT_PRESSURE_9)
};
// Ensure that every request has been read and processed.
await Task.Delay(1);
// Return the information.
return(information);
}
/// <summary>
/// Initializes the BMP280 async.
///
/// Caution:
/// This is required before accessing other
/// methods in this class.
/// </summary>
/// <param name="i2cController">Underlying I2C controller.</param>
/// <returns>Task.</returns>
public async Task InitializeAsync(I2cController i2cController)
{
Logger.Log(this, "InitializeAsync");
// Setup device.
bmp280 = i2cController.GetDevice(new I2cConnectionSettings(BMP280_ADDRESS)
{
BusSpeed = I2cBusSpeed.FastMode
});
// Ensure device has been found.
if (bmp280 == null)
{
throw new OperationCanceledException("BPM280 device not found.");
}
// Setup device.
byte[] writeBuffer = new byte[] { REGISTER_CHIPID };
byte[] readBuffer = new byte[] { 0xFF };
// Read signature.
bmp280.WriteRead(writeBuffer, readBuffer);
byte signature = readBuffer[0];
// Ensure valid signature has been found.
if (signature != BMP280_SIGNATURE)
{
Logger.Log(this, $"Found signature {signature.ToString()} does not match required signature: '{BMP280_SIGNATURE.ToString()}'");
return;
}
// Set state as initialized.
isInitialized = true;
// Read calibration information from i2c device.
calibrationInformation = await ReadCalibrationInformation();
// Write /enable(?) control register
await WriteControlRegister();
}