using System;
using System.Threading.Tasks;
using Windows.Devices.I2c;namespace BH1750FVIDemo
{/// <summary>/// I2C Address Setting/// </summary>enum AddressSetting{/// <summary>/// ADD Pin connect to high power level/// </summary>AddPinHigh = 0x5C,/// <summary>/// ADD Pin connect to low power level /// </summary>     AddPinLow = 0x23            };/// <summary>/// The mode of measuring/// </summary>enum MeasurementMode{/// <summary>/// Start measurement at 1 lx resolution/// </summary>ContinuouslyHighResolutionMode = 0x10,/// <summary>/// Start measurement at 0.5 lx resolution/// </summary>ContinuouslyHighResolutionMode2 = 0x11,/// <summary>/// Start measurement at 4 lx resolution/// </summary>ContinuouslyLowResolutionMode = 0x13,/// <summary>/// Start measurement at 1 lx resolution once/// </summary>OneTimeHighResolutionMode = 0x20,/// <summary>/// Start measurement at 0.5 lx resolution once/// </summary>OneTimeHighResolutionMode2 = 0x21,/// <summary>/// Start measurement at 4 lx resolution once/// </summary>OneTimeLowResolutionMode = 0x23}/// <summary>/// Setting light transmittance/// </summary>enum LightTransmittance{Fifty,Eighty,Hundred,Hundred_Twenty,Hundred_Fifty,Two_Hundred}class BH1750FVI{I2cDevice sensor;private byte sensorAddress;                             private byte sensorMode;private byte sensorResolution = 1;private double sensorTransmittance = 1;private byte registerHighVal = 0x42;private byte registerLowVal = 0x65;/// <summary>/// Constructor/// </summary>/// <param name="address">Enumeration type of AddressSetting</param>/// <param name="mode">Enumeration type of MeasurementMode</param>public BH1750FVI(AddressSetting address, MeasurementMode mode){sensorAddress = (byte)address;sensorMode = (byte)mode;if (mode == MeasurementMode.ContinuouslyHighResolutionMode2 || mode == MeasurementMode.OneTimeHighResolutionMode2){sensorResolution = 2;}}/// <summary>/// Constructor/// </summary>/// <param name="address">Enumeration type of AddressSetting</param>/// <param name="mode">Enumeration type of MeasurementMode</param>/// <param name="transmittance">Enumeration type of LightTransmittance</param>public BH1750FVI(AddressSetting address, MeasurementMode mode, LightTransmittance transmittance){sensorAddress = (byte)address;sensorMode = (byte)mode;if (mode == MeasurementMode.ContinuouslyHighResolutionMode2 || mode == MeasurementMode.OneTimeHighResolutionMode2){sensorResolution = 2;}switch (transmittance){case LightTransmittance.Fifty:{registerHighVal = 0x44;registerLowVal = 0x6A;sensorTransmittance = 0.5;}break;case LightTransmittance.Eighty:{registerHighVal = 0x42;registerLowVal = 0x76;sensorTransmittance = 0.8;}break;case LightTransmittance.Hundred:{registerHighVal = 0x42;registerLowVal = 0x65;}break;case LightTransmittance.Hundred_Twenty:{registerHighVal = 0x41;registerLowVal = 0x7A;sensorTransmittance = 1.2;}break;case LightTransmittance.Hundred_Fifty:{registerHighVal = 0x41;registerLowVal = 0x7E;sensorTransmittance = 1.5;}break;case LightTransmittance.Two_Hundred:{registerHighVal = 0x41;registerLowVal = 0x73;sensorTransmittance = 2;}break;}}/// <summary>/// Initialize BH1750FVI/// </summary>public async Task InitializeAsync(){var settings = new I2cConnectionSettings(sensorAddress);settings.BusSpeed = I2cBusSpeed.FastMode;                     var controller = await I2cController.GetDefaultAsync();sensor = controller.GetDevice(settings);sensor.Write(new byte[] { 0x01 });sensor.Write(new byte[] { registerHighVal });sensor.Write(new byte[] { registerLowVal });}/// <summary>/// Read data from BH1750FVI/// </summary>/// <returns>A double type contains data</returns>public double Read(){byte[] readBuf = new byte[2];sensor.WriteRead(new byte[] { sensorMode }, readBuf);byte temp = readBuf[0];readBuf[0] = readBuf[1];readBuf[1] = temp;double result = BitConverter.ToUInt16(readBuf, 0) / (1.2 * sensorResolution * sensorTransmittance);return result;}/// <summary>/// Cleanup/// </summary>public void Dispose(){sensor.Dispose();}}
}