/// <summary>
/// Initializes a new instance of the <see cref="Pcf8574InputBinaryPin"/> class.
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="pin">The pin.</param>
public Pcf8574InputBinaryPin(Pcf8574I2cConnection connection, Pcf8574Pin pin)
{
this.connection = connection;
this.pin = pin;
connection.SetInputPin(pin, true);
}
/// <summary>
/// Initializes a new instance of the <see cref="Pcf8574InputBinaryPin"/> class.
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="pin">The pin.</param>
public Pcf8574InputBinaryPin(Pcf8574I2cConnection connection, Pcf8574Pin pin)
{
this.connection = connection;
this.pin = pin;
connection.SetInputPin(pin, true);
}
/// <summary>
/// Initializes a new instance of the <see cref="Pcf8574OutputBinaryPin"/> class.
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="pin">The pin.</param>
public Pcf8574OutputBinaryPin(Pcf8574Device connection, Pcf8574Pin pin)
{
this.connection = connection;
this.pin = pin;
connection.SetInputPin(pin, false);
}
internal void SetInputPin(Pcf8574Pin pin, bool isInput)
{
var bit = GetPinBit(pin);
inputPins = (byte)(isInput
? inputPins | bit
: inputPins & ~bit);
}
/// <summary>
/// Gets the pin status.
/// </summary>
/// <param name="pin">The pin.</param>
/// <returns></returns>
public bool GetPinStatus(Pcf8574Pin pin)
{
var bit = GetPinBit(pin);
if ((inputPins & bit) == 0x00)
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Cannot get value of input pin {0}", pin));
var status = connection.ReadByte();
return (status & bit) != 0x00;
}
internal void SetInputPin(Pcf8574Pin pin, bool isInput)
{
var bit = GetPinBit(pin);
this.inputPins = (byte)(isInput
? this.inputPins | bit
: this.inputPins & ~bit);
this.connection.Write((byte)(this.currentStatus | this.inputPins));
}
internal void SetInputPin(Pcf8574Pin pin, bool isInput)
{
var bit = GetPinBit(pin);
inputPins = (byte)(isInput
? inputPins | bit
: inputPins & ~bit);
connection.Write((byte)(currentStatus | inputPins));
}
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),
}
});
}
/// <summary>
/// Gets the pin status.
/// </summary>
/// <param name="pin">The pin.</param>
/// <returns></returns>
public bool GetPinStatus(Pcf8574Pin pin)
{
var bit = GetPinBit(pin);
if ((inputPins & bit) == 0x00)
{
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Cannot get value of input pin {0}", pin));
}
var status = connection.ReadByte();
return((status & bit) != 0x00);
}
/// <summary>
/// Sets the pin status.
/// </summary>
/// <param name="pin">The pin.</param>
/// <param name="enabled">if set to <c>true</c>, specified pin is enabled.</param>
public void SetPinStatus(Pcf8574Pin pin, bool enabled)
{
var bit = GetPinBit(pin);
if ((inputPins & bit) != 0x00)
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Cannot set value of input pin {0}", pin));
var status = currentStatus;
var newStatus = (byte)(enabled
? status | bit
: status & ~bit);
connection.Write((byte)(newStatus | inputPins));
currentStatus = newStatus;
}
/// <summary>
/// Sets the pin status.
/// </summary>
/// <param name="pin">The pin.</param>
/// <param name="enabled">if set to <c>true</c>, specified pin is enabled.</param>
public void SetPinStatus(Pcf8574Pin pin, bool enabled)
{
var bit = GetPinBit(pin);
if ((inputPins & bit) != 0x00)
{
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Cannot set value of input pin {0}", pin));
}
var status = currentStatus;
var newStatus = (byte)(enabled
? status | bit
: status & ~bit);
connection.Write((byte)(newStatus | inputPins));
currentStatus = newStatus;
}
/// <summary>
/// Toogles the specified pin.
/// </summary>
/// <param name="pin">The pin.</param>
public void Toogle(Pcf8574Pin pin)
{
var bit = GetPinBit(pin);
if ((this.inputPins & bit) != 0x00)
{
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Cannot set value of input pin {0}", pin));
}
var status = this.currentStatus;
var bitEnabled = (status & bit) != 0x00;
var newBitEnabled = !bitEnabled;
var newStatus = (byte)(newBitEnabled
? status | bit
: status & ~bit);
this.connection.Write((byte)(newStatus | this.inputPins));
this.currentStatus = newStatus;
}
/// <summary>
/// Creates an input binary pin.
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="pin">The pin.</param>
/// <returns>The pin.</returns>
public static Pcf8574InputBinaryPin In(this Pcf8574I2cConnection connection, Pcf8574Pin pin)
{
return new Pcf8574InputBinaryPin(connection, pin);
}
/// <summary>
/// Creates an input binary pin.
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="pin">The pin.</param>
/// <returns>The pin.</returns>
public static Pcf8574InputBinaryPin In(this Pcf8574I2cConnection connection, Pcf8574Pin pin)
{
return(new Pcf8574InputBinaryPin(connection, pin));
}
/// <summary>
/// Creates an output binary pin.
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="pin">The pin.</param>
/// <returns>The output pin.</returns>
public static Pcf8574OutputBinaryPin Out(this Pcf8574Device connection, Pcf8574Pin pin)
{
return(new Pcf8574OutputBinaryPin(connection, pin));
}
private static byte GetPinBit(Pcf8574Pin pin)
{
return((byte)(int)pin);
}
private static byte GetPinBit(Pcf8574Pin pin)
{
return (byte) (int) pin;
}
internal void SetInputPin(Pcf8574Pin pin, bool isInput)
{
var bit = GetPinBit(pin);
inputPins = (byte) (isInput
? inputPins | bit
: inputPins & ~bit);
}
internal void SetInputPin(Pcf8574Pin pin, bool isInput)
{
var bit = GetPinBit(pin);
inputPins = (byte) (isInput
? inputPins | bit
: inputPins & ~bit);
connection.Write((byte) (currentStatus | inputPins));
}
