private async Task <BMP280_CalibrationData> ReadCoefficeints()
{
// 16 bit calibration data is stored as Little Endian, the helper method will do the byte swap.
CalibrationData = new BMP280_CalibrationData();
// Read temperature calibration data
CalibrationData.dig_T1 = ReadUInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_T1);
CalibrationData.dig_T2 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_T2);
CalibrationData.dig_T3 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_T3);
// Read presure calibration data
CalibrationData.dig_P1 = ReadUInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P1);
CalibrationData.dig_P2 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P2);
CalibrationData.dig_P3 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P3);
CalibrationData.dig_P4 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P4);
CalibrationData.dig_P5 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P5);
CalibrationData.dig_P6 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P6);
CalibrationData.dig_P7 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P7);
CalibrationData.dig_P8 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P8);
CalibrationData.dig_P9 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P9);
await Task.Delay(1);
return(CalibrationData);
}
private async Task Begin()
{
Debug.WriteLine("BMP280::Begin");
byte[] WriteBuffer = new byte[] { (byte)eRegisters.BMP280_REGISTER_CHIPID };
byte[] ReadBuffer = new byte[] { 0xFF };
// Check the device signature
bmp280.WriteRead(WriteBuffer, ReadBuffer);
Debug.WriteLine("BMP280 Signature: " + ReadBuffer[0].ToString());
if (ReadBuffer[0] != BMP280_Signature)
{
Debug.WriteLine("BMP280::begin Signature MISMATCH!!!!!!!!!!!!!!!!!");
return;
}
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<BMP280_CalibrationData> ReadCoefficeints()
{
// 16 bit calibration data is stored as Little Endian, the helper method will do the byte swap.
CalibrationData = new BMP280_CalibrationData();
// Read temperature calibration data
CalibrationData.dig_T1 = ReadUInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_T1);
CalibrationData.dig_T2 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_T2);
CalibrationData.dig_T3 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_T3);
// Read presure calibration data
CalibrationData.dig_P1 = ReadUInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P1);
CalibrationData.dig_P2 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P2);
CalibrationData.dig_P3 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P3);
CalibrationData.dig_P4 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P4);
CalibrationData.dig_P5 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P5);
CalibrationData.dig_P6 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P6);
CalibrationData.dig_P7 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P7);
CalibrationData.dig_P8 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P8);
CalibrationData.dig_P9 = ReadInt16_LittleEndian((byte)eRegisters.BMP280_REGISTER_DIG_P9);
await Task.Delay(1);
return CalibrationData;
}
private async Task Begin()
{
Debug.WriteLine("BMP280::Begin");
byte[] WriteBuffer = new byte[] { (byte) eRegisters.BMP280_REGISTER_CHIPID};
byte[] ReadBuffer = new byte[] { 0xFF };
// Check the device signature
bmp280.WriteRead(WriteBuffer, ReadBuffer);
Debug.WriteLine("BMP280 Signature: " + ReadBuffer[0].ToString());
if (ReadBuffer[0] != BMP280_Signature)
{
Debug.WriteLine("BMP280::begin Signature MISMATCH!!!!!!!!!!!!!!!!!");
return;
}
Init = true;
// read the coefficients table
CalibrationData = await ReadCoefficeints();
// Write control register
await WriteControlRegister(0x3F);
// write humidity control register
await WriteControlRegisterHumidity(0x03);
}
