private void Synchronize()
{
clockPin.Write(true);
Sleep(0.001m); // 1 microsecond pause - enable pulse must be > 450ns
clockPin.Write(false);
Sleep(0.001m); // commands need > 37us to settle
}
private void WriteByte4Pins(int bits, bool charMode)
{
registerSelectPin.Write(charMode);
dataPins[0].Write((bits & 0x10) != 0);
dataPins[1].Write((bits & 0x20) != 0);
dataPins[2].Write((bits & 0x40) != 0);
dataPins[3].Write((bits & 0x80) != 0);
Synchronize();
dataPins[0].Write((bits & 0x01) != 0);
dataPins[1].Write((bits & 0x02) != 0);
dataPins[2].Write((bits & 0x04) != 0);
dataPins[3].Write((bits & 0x08) != 0);
Synchronize();
}
/// <summary>
/// Initializes a new instance of the <see cref="Hd44780LcdConnection"/> class.
/// </summary>
/// <param name="settings">The settings.</param>
/// <param name="registerSelectPin">The register select pin.</param>
/// <param name="clockPin">The clock pin.</param>
/// <param name="dataPins">The data pins.</param>
public Hd44780LcdConnection(Hd44780LcdConnectionSettings settings, IOutputPin registerSelectPin, IOutputPin clockPin, IEnumerable <IOutputPin> dataPins)
{
settings = settings ?? new Hd44780LcdConnectionSettings();
this.registerSelectPin = registerSelectPin;
this.clockPin = clockPin;
this.dataPins = dataPins.ToArray();
if (this.dataPins.Length != 4 && this.dataPins.Length != 8)
{
throw new ArgumentOutOfRangeException("dataPins", this.dataPins.Length, "There must be either 4 or 8 data pins");
}
width = settings.ScreenWidth;
height = settings.ScreenHeight;
if (height < 1 || height > 2)
{
throw new ArgumentOutOfRangeException("ScreenHeight", height, "Screen must have either 1 or 2 rows");
}
if (width * height > 80)
{
throw new ArgumentException("At most 80 characters are allowed");
}
if (settings.PatternWidth != 5)
{
throw new ArgumentOutOfRangeException("PatternWidth", settings.PatternWidth, "Pattern must be 5 pixels width");
}
if (settings.PatternHeight != 8 && settings.PatternHeight != 10)
{
throw new ArgumentOutOfRangeException("PatternHeight", settings.PatternWidth, "Pattern must be either 7 or 10 pixels height");
}
if (settings.PatternHeight == 10 && height == 2)
{
throw new ArgumentException("10 pixels height pattern cannot be used with 2 rows");
}
functions = (settings.PatternHeight == 8 ? Functions.Matrix5x8 : Functions.Matrix5x10)
| (height == 1 ? Functions.OneLine : Functions.TwoLines)
| (this.dataPins.Length == 4 ? Functions.Data4bits : Functions.Data8bits);
entryModeFlags = /*settings.RightToLeft
* ? EntryModeFlags.EntryRight | EntryModeFlags.EntryShiftDecrement
* :*/EntryModeFlags.EntryLeft | EntryModeFlags.EntryShiftDecrement;
encoding = settings.Encoding;
registerSelectPin.Write(false);
clockPin.Write(false);
foreach (var dataPin in this.dataPins)
{
dataPin.Write(false);
}
WriteByte(0x33, false); // Initialize
WriteByte(0x32, false);
WriteCommand(Command.SetFunctions, (int)functions);
WriteCommand(Command.SetDisplayFlags, (int)displayFlags);
WriteCommand(Command.SetEntryModeFlags, (int)entryModeFlags);
Clear();
}
/// <summary>
/// Initializes a new instance of the <see cref="Hd44780LcdConnection"/> class.
/// </summary>
/// <param name="settings">The settings.</param>
/// <param name="registerSelectPin">The register select pin.</param>
/// <param name="clockPin">The clock pin.</param>
/// <param name="dataPins">The data pins.</param>
public Hd44780LcdConnection(Hd44780LcdConnectionSettings settings, IOutputPin registerSelectPin, IOutputPin clockPin, IEnumerable<IOutputPin> dataPins)
{
settings = settings ?? new Hd44780LcdConnectionSettings();
this.registerSelectPin = registerSelectPin;
this.clockPin = clockPin;
this.dataPins = dataPins.ToArray();
if (this.dataPins.Length != 4 && this.dataPins.Length != 8)
throw new ArgumentOutOfRangeException("dataPins", this.dataPins.Length, "There must be either 4 or 8 data pins");
width = settings.ScreenWidth;
height = settings.ScreenHeight;
if (height < 1 || height > 2)
throw new ArgumentOutOfRangeException("ScreenHeight", height, "Screen must have either 1 or 2 rows");
if (width * height > 80)
throw new ArgumentException("At most 80 characters are allowed");
if (settings.PatternWidth != 5)
throw new ArgumentOutOfRangeException("PatternWidth", settings.PatternWidth, "Pattern must be 5 pixels width");
if (settings.PatternHeight != 8 && settings.PatternHeight != 10)
throw new ArgumentOutOfRangeException("PatternHeight", settings.PatternWidth, "Pattern must be either 7 or 10 pixels height");
if (settings.PatternHeight == 10 && height == 2)
throw new ArgumentException("10 pixels height pattern cannot be used with 2 rows");
functions = (settings.PatternHeight == 8 ? Functions.Matrix5x8 : Functions.Matrix5x10)
| (height == 1 ? Functions.OneLine : Functions.TwoLines)
| (this.dataPins.Length == 4 ? Functions.Data4bits : Functions.Data8bits);
entryModeFlags = /*settings.RightToLeft
? EntryModeFlags.EntryRight | EntryModeFlags.EntryShiftDecrement
:*/ EntryModeFlags.EntryLeft | EntryModeFlags.EntryShiftDecrement;
encoding = settings.Encoding;
registerSelectPin.Write(false);
clockPin.Write(false);
foreach (var dataPin in this.dataPins)
dataPin.Write(false);
WriteByte(0x33, false); // Initialize
WriteByte(0x32, false);
WriteCommand(Command.SetFunctions, (int) functions);
WriteCommand(Command.SetDisplayFlags, (int) displayFlags);
WriteCommand(Command.SetEntryModeFlags, (int) entryModeFlags);
Clear();
}
