private async Task Begin()
{
Debug.WriteLine("BME280::Begin");
// A buffer that contains the data that you want to write to the I2 C device.
// This data should not include the bus address.
byte[] writeBuffer = { (byte)RegisterMemoryAddress.RegisterChipId };
// The buffer to which you want to read the data from the I2 C bus.
// The length of the buffer determines how much data to request from the device.
byte[] readBuffer = { 0xFF };
// Read the device signature
_bme280Device.WriteRead(writeBuffer, readBuffer);
Debug.WriteLine("BME280 Signature: " + readBuffer[0]);
// Verify this is the BME280 which has chip number 0x60
if (readBuffer[0] != ChipIdentificationNumber)
{
Debug.WriteLine("BME280::Begin Signature Mismatch.");
return;
}
// Set the initialize variable to true
_isInitialized = true;
// Read the coefficients table
_calibrationData = await ReadCalibrationData();
// Write control register
await WriteControlRegister();
// Write humidity control register
// await WriteControlRegisterHumidity();
}
/// <summary>
/// To read the calibration data from the registers
/// </summary>
/// <returns></returns>
private async Task <CalibrationData> ReadCalibrationData()
{
// 16 bit calibration data is stored as Little Endian, the helper method will do the byte swap.
_calibrationData = new CalibrationData();
// Read temperature calibration data
_calibrationData.CompensationT1 = (ushort)Read16BitValueFromAssignedMemory((byte)RegisterMemoryAddress.CompensationT1);
_calibrationData.CompensationT2 = (short)Read16BitValueFromAssignedMemory((byte)RegisterMemoryAddress.CompensationT2);
_calibrationData.CompensationT3 = (short)Read16BitValueFromAssignedMemory((byte)RegisterMemoryAddress.CompensationT3);
await Task.Delay(1);
return(_calibrationData);
}
