private bool ReadData()
{
int sequence1 = 0, sequence2 = 0;
_adcCsPin.Write(GpioPinValue.Low);
InitReadSession();
var waiter = new SynchronousWaiter();
InitAdConverter(waiter);
//Read the first sequence
for (var i = 0; i < 8; i++)
{
_adcClkPin.Write(GpioPinValue.High);
waiter.Wait(2);
_adcClkPin.Write(GpioPinValue.Low);
waiter.Wait(2);
sequence1 = sequence1 << 1 | (int)_adcDigitalIoPin.Read();
}
//Read the second sequence
for (var i = 0; i < 8; i++)
{
sequence2 = sequence2 | (int)_adcDigitalIoPin.Read() << i;
_adcClkPin.Write(GpioPinValue.High);
waiter.Wait(2);
_adcClkPin.Write(GpioPinValue.Low);
waiter.Wait(2);
}
_adcCsPin.Write(GpioPinValue.High);
if (sequence1 == sequence2)
{
OnTemperatureMeasured?.Invoke(this,
new TemperatureData { IsValid = true, Temperature =
Math.Round(((255 - sequence1) - 121) * 0.21875,1) + 21.8, Timestamp = DateTimeOffset.UtcNow});
return true;
}
return false;
}
private void InitAdConverter(SynchronousWaiter waiter)
{
_adcCsPin.Write(GpioPinValue.Low);
_adcClkPin.Write(GpioPinValue.Low);
_adcDigitalIoPin.Write(GpioPinValue.High); waiter.Wait(2);
_adcClkPin.Write(GpioPinValue.High); waiter.Wait(2);
_adcClkPin.Write(GpioPinValue.Low);
_adcDigitalIoPin.Write(GpioPinValue.High); waiter.Wait(2);
_adcClkPin.Write(GpioPinValue.High); waiter.Wait(2);
_adcClkPin.Write(GpioPinValue.Low);
_adcDigitalIoPin.Write(GpioPinValue.Low); waiter.Wait(2);
_adcClkPin.Write(GpioPinValue.High);
_adcDigitalIoPin.Write(GpioPinValue.High); waiter.Wait(2);
_adcClkPin.Write(GpioPinValue.Low);
_adcDigitalIoPin.Write(GpioPinValue.High); waiter.Wait(2);
_adcDigitalIoPin.SetDriveMode(GpioPinDriveMode.Input);
}