private static byte InputGainToByteValue(InputGain gain)
{
switch (gain)
{
case InputGain.Gain1:
return(0);
case InputGain.Gain2:
return(1);
case InputGain.Gain4:
return(2);
case InputGain.Gain8:
return(3);
case InputGain.Gain16:
return(4);
case InputGain.Gain32:
return(5);
case InputGain.Gain64:
return(6);
default:
throw new ArgumentOutOfRangeException(nameof(gain), gain, null);
}
}
public Registers(
InputGain gain,
InputDataRate dataRate,
InputDetectCurrentSources detectCurrentSources,
bool autoCalibrate,
bool useInputBuffer)
{
Gain = gain;
DataRate = dataRate;
DetectCurrentSources = detectCurrentSources;
AutoCalibrate = autoCalibrate;
UseInputBuffer = useInputBuffer;
GainFactor = GetGainFactor();
}
private Registers ReadRegisters(SpiDevice spiDevice)
{
WaitDataReady();
byte[] readRegResponse = new byte[4]; // Make room for Status, Mux, AdControl & AdDataRate
byte[] readRegRequest =
{
Constants.Command.ReadReg,
(byte)(readRegResponse.Length - 1)
};
spiDevice.Write(readRegRequest);
_timing.WaitMicroseconds(10);
spiDevice.Read(readRegResponse);
byte statusRegister = readRegResponse[Constants.Register.Status];
//byte muxRegister = readRegResponse[Constants.Register.Mux]; <-- The MUX value is not interesting
byte adControlRegister = readRegResponse[Constants.Register.AdControl];
byte adDataRateRegister = readRegResponse[Constants.Register.AdDataRate];
bool autoCalibrate = (statusRegister & (1 << Constants.StatusRegister.AutoCalibrateBit)) != 0;
bool useInputBuffer = (statusRegister & (1 << Constants.StatusRegister.AnalogInputBufferBit)) != 0;
InputGain inputGain = ByteValueToInputGain((byte)(adControlRegister & 0x07)); // Bit 0-2 of the "AdControl" register holds the input gain value
InputDetectCurrentSources inputDetectCurrentSources = ByteValueToDetectCurrentSources((byte)(adControlRegister & 0x18)); // Bit 3-4 of the "AdControl" register holds the "Detect Current Sources" value
InputDataRate inputDataRate = ByteValueToInputDataRate(adDataRateRegister);
return(new Registers(
inputGain,
inputDataRate,
inputDetectCurrentSources,
autoCalibrate,
useInputBuffer));
}