// 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.
this.calibrationData = new Bmp280CalibrationData();
// Read temperature calibration data
this.calibrationData.DigT1 = this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigT1);
this.calibrationData.DigT2 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigT2);
this.calibrationData.DigT3 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigT3);
// Read presure calibration data
this.calibrationData.DigP1 = this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP1);
this.calibrationData.DigP2 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP2);
this.calibrationData.DigP3 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP3);
this.calibrationData.DigP4 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP4);
this.calibrationData.DigP5 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP5);
this.calibrationData.DigP6 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP6);
this.calibrationData.DigP7 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP7);
this.calibrationData.DigP8 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP8);
this.calibrationData.DigP9 = (short)this.ReadUInt16_LittleEndian((byte)ERegisters.Bmp280RegisterDigP9);
await Task.Delay(1);
return(this.calibrationData);
}
private async Task Begin()
{
Console.WriteLine("BMP280::Begin");
// Read the device signature
this.i2CBus.WriteCommand(Bmp280Address, (byte)ERegisters.Bmp280RegisterChipid);
var buffer = this.i2CBus.ReadBytes(Bmp280Address, 1);
Console.WriteLine("BMP280 Signature: " + buffer[0].ToString());
// Set the initalize variable to true
this.init = true;
// Read the coefficients table
this.calibrationData = await this.ReadCoefficeints();
// Write control register
await this.WriteControlRegister();
// Write humidity control register
await this.WriteControlRegisterHumidity();
}
