/// <summary>
/// Applies the configuration for the current text display
/// </summary>
/// <returns>A notification of when the task completes</returns>
private void ConfigureTextDisplay()
{
if (isConfigured)
{
SendInstruction(InstructionDefinitions.FUNCTION_SET(is8BitMode, isDoubleLines, !isFont5x8));
}
}
/// <summary>
/// Applies the configuration for the display
/// </summary>
/// <returns>A notification of when the task completes</returns>
private void ConfigureDisplay()
{
if (isConfigured)
{
SendInstruction(InstructionDefinitions.DISPLAY_ONOFF_CONTROL(isDisplayOn, isCursorOn, isCursorBlinking));
}
}
/// <summary>
/// Writes a string of text to the display
/// </summary>
/// <param name="text">The text to display</param>
/// <returns>A notification of when the task completes</returns>
public void Write(string text)
{
foreach (var c in text)
{
BitArray character = new BitArray(new byte[] { Convert.ToByte(c) });
SendInstruction(InstructionDefinitions.WRITE_DATA(character[7], character[6], character[5], character[4], character[3], character[2], character[1], character[0]));
}
}
/// <summary>
/// Sets the position of the cursor
/// </summary>
/// <param name="row">The row to move the cursor to</param>
/// <param name="column">The column to move the cursor to</param>
/// <returns>A notification of when the task completes</returns>
public void SetCursorPosition(int row, int column)
{
if (!isDoubleLines)
{
row = 0;
}
if (row > 1)
{
row = 1;
}
if (column > 40)
{
column = 40;
}
BitArray pos = new BitArray(new int[] { ((40 * row) + column) });
SendInstruction(InstructionDefinitions.SET_DDRAM_ADDRESS(pos[6], pos[5], pos[4], pos[3], pos[2], pos[1], pos[0]));
}
/// <summary>
/// The initialisation method, this needs to be called before the screen is ready for use.
/// </summary>
/// <param name="rs">The number of the GPIO pin assigned to the RS pin on the display</param>
/// <param name="rw">The number of the GPIO pin assigned to the RW pin on the display</param>
/// <param name="enable">The number of the GPIO pin assigned to the Enable pin on the display</param>
/// <param name="d7">The number of the GPIO pin assigned to the D7 pin on the display</param>
/// <param name="d6">The number of the GPIO pin assigned to the D6 pin on the display</param>
/// <param name="d5">The number of the GPIO pin assigned to the D5 pin on the display</param>
/// <param name="d4">The number of the GPIO pin assigned to the D4 pin on the display</param>
/// <param name="d3">The number of the GPIO pin assigned to the D3 pin on the display</param>
/// <param name="d2">The number of the GPIO pin assigned to the D2 pin on the display</param>
/// <param name="d1">The number of the GPIO pin assigned to the D1 pin on the display</param>
/// <param name="d0">The number of the GPIO pin assigned to the D0 pin on the display</param>
/// <returns>A notification of when the task completes</returns>
public void Init(int rs, int rw, int enable, int d7, int d6, int d5, int d4, int d3, int d2, int d1, int d0)
{
var gpio = GpioController.GetDefault();
rsPin = gpio.OpenPin(rs);
rsPin.SetDriveMode(GpioPinDriveMode.Output);
rwPin = gpio.OpenPin(rw);
rwPin.SetDriveMode(GpioPinDriveMode.Output);
enablePin = gpio.OpenPin(enable);
enablePin.SetDriveMode(GpioPinDriveMode.Output);
enablePin.Write(GpioPinValue.Low);
d0Pin = gpio.OpenPin(d0);
d0Pin.SetDriveMode(GpioPinDriveMode.Output);
d1Pin = gpio.OpenPin(d1);
d1Pin.SetDriveMode(GpioPinDriveMode.Output);
d2Pin = gpio.OpenPin(d2);
d2Pin.SetDriveMode(GpioPinDriveMode.Output);
d3Pin = gpio.OpenPin(d3);
d3Pin.SetDriveMode(GpioPinDriveMode.Output);
d4Pin = gpio.OpenPin(d4);
d4Pin.SetDriveMode(GpioPinDriveMode.Output);
d5Pin = gpio.OpenPin(d5);
d5Pin.SetDriveMode(GpioPinDriveMode.Output);
d6Pin = gpio.OpenPin(d6);
d6Pin.SetDriveMode(GpioPinDriveMode.Output);
d7Pin = gpio.OpenPin(d7);
d7Pin.SetDriveMode(GpioPinDriveMode.Output);
isConfigured = true;
TurnDisplayOff();
TurnDisplayOn();
ClearDisplay();
ConfigureTextDisplay();
ConfigureDisplay();
SendInstruction(InstructionDefinitions.ENTRY_MODE_SET(true, false));
SetCursorPosition(0, 0);
}
/// <summary>
/// Clears the display and returns the cursor to the origin (first row, first column)
/// </summary>
/// <returns>A notification of when the task completes</returns>
public void ClearDisplay()
{
SendInstruction(InstructionDefinitions.CLEAR_DISPLAY());
SetCursorPosition(0, 0);
}