private static Hd44780Configuration LoadPcf8574Configuration(IEnumerable <string> args) { var addressText = args.SkipWhile(s => !String.Equals(s, "pcf8574", StringComparison.InvariantCultureIgnoreCase)).Skip(1).DefaultIfEmpty("0x20").First(); var address = addressText.StartsWith("0x", StringComparison.InvariantCultureIgnoreCase) ? Int32.Parse(addressText.Substring(2), NumberStyles.HexNumber) : Int32.Parse(addressText); const Pcf8574Pin clockPin = Pcf8574Pin.P2; const Pcf8574Pin readWritePin = Pcf8574Pin.P1; const Pcf8574Pin registerSelectPin = Pcf8574Pin.P0; const Pcf8574Pin backlightPin = Pcf8574Pin.P3; var dataPins = new[] { Pcf8574Pin.P4, Pcf8574Pin.P5, Pcf8574Pin.P6, Pcf8574Pin.P7 }; Console.WriteLine(); Console.WriteLine("Using I2C connection over PCF8574 expander"); Console.WriteLine("\tRegister Select: {0}", registerSelectPin); Console.WriteLine("\tClock: {0}", clockPin); Console.WriteLine("\tData 1: {0}", dataPins[0]); Console.WriteLine("\tData 2: {0}", dataPins[1]); Console.WriteLine("\tData 3: {0}", dataPins[2]); Console.WriteLine("\tData 4: {0}", dataPins[3]); Console.WriteLine("\tBacklight: {0}", backlightPin); Console.WriteLine("\tRead/write: {0}", readWritePin); Console.WriteLine(); const ConnectorPin sdaPin = ConnectorPin.P1Pin03; const ConnectorPin sclPin = ConnectorPin.P1Pin05; var driver = new I2cDriver(sdaPin.ToProcessor(), sclPin.ToProcessor()) { ClockDivider = 512 }; var connection = new Pcf8574I2cConnection(driver.Connect(address)); return(new Hd44780Configuration(driver) { Pins = new Hd44780Pins( connection.Out(registerSelectPin), connection.Out(clockPin), dataPins.Select(p => (IOutputBinaryPin)connection.Out(p))) { Backlight = connection.Out(backlightPin), ReadWrite = connection.Out(readWritePin), } }); }