public static int Setup(SpiChannelEnum channel, int speed)
{
if (speed < 500000 || speed > 32000000)
{
throw new ArgumentOutOfRangeException(nameof(speed));
}
var spiPin = channel.ToPinNumber();
Pins.Setup(spiPin, PinModeEnum.Output);
Pins.Write(spiPin, true);
var fileDescriptor = Unmanaged.Spi.Setup((int)channel, speed);
if (fileDescriptor >= 0)
{
return(fileDescriptor);
}
switch (fileDescriptor)
{
case -1:
throw new Exception("Could not setup SPI. Function open() or ioctl() did not execute correctly.");
default:
throw new Exception($"Could not setup SPI. Result: {fileDescriptor}.");
}
}