private int ReadI2CLux()
{
byte[] regAddrBuf = new byte[] { 0x23 };
byte[] readBuf = new byte[2];
I2CLightSensor.WriteRead(regAddrBuf, readBuf);
// is this calculation correct?
var valf = ((readBuf[0] << 8) | readBuf[1]) / 1.2;
return((int)valf);
}
public async Task InitLightSensorAsync()
{
string aqs = I2cDevice.GetDeviceSelector();
/* Get a selector string that will return all I2C controllers on the system */
var dis = await DeviceInformation.FindAllAsync(aqs);
/* Find the I2C bus controller device with our selector string */
if (dis.Count == 0)
{
throw new FileNotFoundException("No I2C controllers were found on the system");
}
var foundAddress = false;
var count = 0;
var address = 0;
do
{
var settings = new I2cConnectionSettings(address)
{
BusSpeed = I2cBusSpeed.FastMode
};
I2CLightSensor = await I2cDevice.FromIdAsync(dis[0].Id, settings);
/* Create an I2cDevice with our selected bus controller and I2C settings */
if (I2CLightSensor == null)
{
throw new UnauthorizedAccessException(string.Format("Slave address {0} on I2C Controller {1} is currently in use by " +
"another application. Please ensure that no other applications are using I2C.", settings.SlaveAddress, dis[0].Id));
}
/* Write the register settings */
try
{
I2CLightSensor.Write(new byte[] { 0x10 }); // 1 [lux] aufloesung
}
/* If the write fails display the error and stop running */
catch (Exception ex)
{
++address;
++count;
Debug.WriteLine("Failed to communicate with device: " + ex.Message);
continue;
}
Debug.WriteLine("【ADDRESS】" + address);
foundAddress = true;
} while (!foundAddress && count < 78);
PeriodicTimer = new Timer(this.TimerCallback, null, 0, TimerIntervalMs);
}