private void LoadCalibration()
{
byte storedCrc = _device.ReadRegister(BME280Constants.BME280_CRC_DATA_ADDR);
var data1 = _device.ReadRegion(BME280Constants.BME280_CRC_CALIB1_ADDR, BME280Constants.BME280_CRC_CALIB1_LEN);
var data2 = _device.ReadRegion(BME280Constants.BME280_CRC_CALIB2_ADDR, BME280Constants.BME280_CRC_CALIB2_LEN);
var calibrationBuffer = new byte[data1.Length + data2.Length];
data1.CopyTo(calibrationBuffer, 0);
data2.CopyTo(calibrationBuffer, data1.Length);
_calibration = new BME280CFData
{
T1 = BitConverter.ToUInt16(calibrationBuffer, 0),
T2 = BitConverter.ToInt16(calibrationBuffer, 2),
T3 = BitConverter.ToInt16(calibrationBuffer, 4),
P1 = BitConverter.ToUInt16(calibrationBuffer, 6),
P2 = BitConverter.ToInt16(calibrationBuffer, 8),
P3 = BitConverter.ToInt16(calibrationBuffer, 10),
P4 = BitConverter.ToInt16(calibrationBuffer, 12),
P5 = BitConverter.ToInt16(calibrationBuffer, 14),
P6 = BitConverter.ToInt16(calibrationBuffer, 16),
P7 = BitConverter.ToInt16(calibrationBuffer, 18),
P8 = BitConverter.ToInt16(calibrationBuffer, 20),
P9 = BitConverter.ToInt16(calibrationBuffer, 22),
H1 = calibrationBuffer[25],
H2 = BitConverter.ToInt16(calibrationBuffer, 26),
H3 = calibrationBuffer[28],
H4 = (short)((calibrationBuffer[29] << 4) | (calibrationBuffer[30] & 0xF)),
H5 = (short)((calibrationBuffer[31] << 4) | (calibrationBuffer[30] >> 4)),
H6 = (sbyte)calibrationBuffer[32]
};
var calculatedCrc = CalculateCrc(calibrationBuffer);
if (storedCrc != calculatedCrc)
{
throw new ApplicationException("CRC error loading configuration.");
}
}
private void LoadCalibration()
{
var crcBuffer = new byte[1];
_device.WriteRead(new byte[] { 0xE8 }, crcBuffer);
var calibrationBuffer = new byte[33];
_device.WriteRead(new byte[] { 0x88 }, 0, 1, calibrationBuffer, 0, 26);
_device.WriteRead(new byte[] { 0xE1 }, 0, 1, calibrationBuffer, 26, 7);
_calibration = new BME280CFData
{
T1 = BitConverter.ToUInt16(calibrationBuffer, 0),
T2 = BitConverter.ToInt16(calibrationBuffer, 2),
T3 = BitConverter.ToInt16(calibrationBuffer, 4),
P1 = BitConverter.ToUInt16(calibrationBuffer, 6),
P2 = BitConverter.ToInt16(calibrationBuffer, 8),
P3 = BitConverter.ToInt16(calibrationBuffer, 10),
P4 = BitConverter.ToInt16(calibrationBuffer, 12),
P5 = BitConverter.ToInt16(calibrationBuffer, 14),
P6 = BitConverter.ToInt16(calibrationBuffer, 16),
P7 = BitConverter.ToInt16(calibrationBuffer, 18),
P8 = BitConverter.ToInt16(calibrationBuffer, 20),
P9 = BitConverter.ToInt16(calibrationBuffer, 22),
H1 = calibrationBuffer[25],
H2 = BitConverter.ToInt16(calibrationBuffer, 26),
H3 = calibrationBuffer[28],
H4 = (short)((calibrationBuffer[29] << 4) | (calibrationBuffer[30] & 0xF)),
H5 = (short)((calibrationBuffer[31] << 4) | (calibrationBuffer[30] >> 4)),
H6 = (sbyte)calibrationBuffer[32]
};
if (crcBuffer[0] != CalculateCrc(calibrationBuffer))
{
throw new ApplicationException("CRC error loading configuration.");
}
}