private async Task <BME280_CalibrationData> ReadCoefficeints()
{
// 16 bit calibration data is stored as Little Endian, the helper method will do the byte swap.
CalibrationData = new BME280_CalibrationData();
// Read temperature calibration data
CalibrationData.dig_T1 = ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_T1);
CalibrationData.dig_T2 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_T2);
CalibrationData.dig_T3 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_T3);
// Read presure calibration data
CalibrationData.dig_P1 = ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P1);
CalibrationData.dig_P2 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P2);
CalibrationData.dig_P3 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P3);
CalibrationData.dig_P4 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P4);
CalibrationData.dig_P5 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P5);
CalibrationData.dig_P6 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P6);
CalibrationData.dig_P7 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P7);
CalibrationData.dig_P8 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P8);
CalibrationData.dig_P9 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P9);
// Read humidity calibration data
CalibrationData.dig_H1 = ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H1);
CalibrationData.dig_H2 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_H2);
CalibrationData.dig_H3 = ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H3);
CalibrationData.dig_H4 = (Int16)((ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H4) << 4) | (ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H4 + 1) & 0xF));
CalibrationData.dig_H5 = (Int16)((ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H5 + 1) << 4) | (ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H5) >> 4));
CalibrationData.dig_H6 = ReadSByte((byte)eRegisters.BME280_REGISTER_DIG_H6);
//T1: 28376
//T2: 26237
//T3: 50
//P1: 36893
//P2: -10856
//P3: 3024
//P4: 8448
//P5: 135
//P6: -7
//P7: 9900
//P8: -10230
//P9: 4285
//H1: 75
//H2: 346
//H3: 0
//H4: 357
//H5: 0
//H6: 30
await Task.Delay(1);
return(CalibrationData);
}
private async Task Begin()
{
Debug.WriteLine("bme280::begin");
Init = true;
// read the coefficients table
CalibrationData = await ReadCoefficeints();
// Write control register
await WriteControlRegister(0x3F);
// write humidity control register
await WriteControlRegisterHumidity(0x03);
}
private async Task<BME280_CalibrationData> ReadCoefficeints()
{
// 16 bit calibration data is stored as Little Endian, the helper method will do the byte swap.
CalibrationData = new BME280_CalibrationData();
// Read temperature calibration data
CalibrationData.dig_T1 = ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_T1);
CalibrationData.dig_T2 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_T2);
CalibrationData.dig_T3 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_T3);
// Read presure calibration data
CalibrationData.dig_P1 = ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P1);
CalibrationData.dig_P2 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P2);
CalibrationData.dig_P3 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P3);
CalibrationData.dig_P4 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P4);
CalibrationData.dig_P5 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P5);
CalibrationData.dig_P6 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P6);
CalibrationData.dig_P7 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P7);
CalibrationData.dig_P8 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P8);
CalibrationData.dig_P9 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P9);
// Read humidity calibration data
CalibrationData.dig_H1 = ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H1);
CalibrationData.dig_H2 = ReadInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_H2);
CalibrationData.dig_H3 = ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H3);
CalibrationData.dig_H4 = (Int16)((ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H4) << 4) | (ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H4 + 1) & 0xF));
CalibrationData.dig_H5 = (Int16)((ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H5 + 1) << 4) | (ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H5) >> 4));
CalibrationData.dig_H6 = ReadSByte((byte)eRegisters.BME280_REGISTER_DIG_H6);
//T1: 28376
//T2: 26237
//T3: 50
//P1: 36893
//P2: -10856
//P3: 3024
//P4: 8448
//P5: 135
//P6: -7
//P7: 9900
//P8: -10230
//P9: 4285
//H1: 75
//H2: 346
//H3: 0
//H4: 357
//H5: 0
//H6: 30
await Task.Delay(1);
return CalibrationData;
}
private async Task Begin()
{
Debug.WriteLine("bme280::begin");
Init = true;
// read the coefficients table
CalibrationData = await ReadCoefficeints();
// Write control register
await WriteControlRegister(0x3F);
// write humidity control register
await WriteControlRegisterHumidity(0x03);
}