//Method to read the caliberation data from the registers
private async Task <Bmp280CalibrationData> ReadCoefficeints()
{
// 16 bit calibration data is stored as Little Endian, the helper method will do the byte swap.
_calibrationData = new Bmp280CalibrationData
{
DigT1 = ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigT1),
DigT2 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigT2),
DigT3 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigT3),
DigP1 = ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP1),
DigP2 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP2),
DigP3 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP3),
DigP4 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP4),
DigP5 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP5),
DigP6 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP6),
DigP7 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP7),
DigP8 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP8),
DigP9 = (short)ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP9)
};
// Read temperature calibration data
// Read presure calibration data
await Task.Delay(1);
return(_calibrationData);
}
private async Task Begin()
{
Debug.WriteLine("BMP280::Begin");
byte[] writeBuffer = { (byte)ERegisters.Bmp280RegisterChipid };
byte[] readBuffer = { 0xFF };
//Read the device signature
_bmp280.WriteRead(writeBuffer, readBuffer);
Debug.WriteLine("BMP280 Signature: " + readBuffer[0].ToString());
//Verify the device signature
if (readBuffer[0] != Bmp280Signature)
{
Debug.WriteLine("BMP280::Begin Signature Mismatch.");
return;
}
//Set the initalize variable to true
_init = true;
//Read the coefficients table
_calibrationData = await ReadCoefficeints();
//Write control register
await WriteControlRegister();
//Write humidity control register
await WriteControlRegisterHumidity();
}