Example #1
0
        //Method to read the caliberation data from the registers
        private BME280CalibrationData ReadCoefficeints()
        {
            // 16 bit calibration data is stored as Little Endian, the helper method will do the byte swap.
            CalibrationData = new BME280CalibrationData();

            // Read temperature calibration data
            CalibrationData.dig_T1 = ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_T1);
            CalibrationData.dig_T2 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_T2);
            CalibrationData.dig_T3 = (Int16)ReadUInt16_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 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P2);
            CalibrationData.dig_P3 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P3);
            CalibrationData.dig_P4 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P4);
            CalibrationData.dig_P5 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P5);
            CalibrationData.dig_P6 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P6);
            CalibrationData.dig_P7 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P7);
            CalibrationData.dig_P8 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P8);
            CalibrationData.dig_P9 = (Int16)ReadUInt16_LittleEndian((byte)eRegisters.BME280_REGISTER_DIG_P9);

            CalibrationData.dig_H1 = ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H1_REG);
            CalibrationData.dig_H2 = (Int16)((ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H2_MSB) << 8) | ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H2_LSB));
            CalibrationData.dig_H3 = ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H3_REG);
            CalibrationData.dig_H4 = (Int16)((ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H4_MSB) << 4) | (ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H4_LSB) & 0xF));
            CalibrationData.dig_H5 = (Int16)((ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H5_MSB) << 4) | (ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H5_LSB) >> 4));
            CalibrationData.dig_H6 = ReadByte((byte)eRegisters.BME280_REGISTER_DIG_H6_REG);

            Thread.Sleep(1);
            return(CalibrationData);
        }
Example #2
0
        private void Begin()
        {
            Debug.WriteLine("BME280::Begin");
            byte[] writeBuffer = new byte[] { (byte)eRegisters.BME280_REGISTER_CHIPID };
            byte[] readBuffer  = new byte[] { 0xFF };

            //Read the device signature
            WriteRead(writeBuffer, readBuffer);
            Debug.WriteLine("BME280 Signature: " + readBuffer[0].ToString());

            //Verify the device signature
            if (readBuffer[0] != BME280_Signature)
            {
                Debug.WriteLine("BME280::Begin Signature Mismatch.");
                return;
            }

            //Set the initalize variable to true
            init = true;

            //Read the coefficients table
            CalibrationData = ReadCoefficeints();

            //Write control register
            WriteControlRegister();

            //Write humidity control register
            WriteControlRegisterHumidity();
        }