Meadow.Foundation.Displays.Il91874

Il91874
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

The IL91874 is a tri-color display controller for ePaper displays. Data is sent to the controller via SPI and supports partial screen updates.

The IL91874 is commonly paired with a 2.7" 264x176 three color ePaper display.

Sample projects available on GitHub

Code Example

MicroGraphics graphics;

public override Task Initialize()
{
    Resolver.Log.Info("Initialize ...");

    var display = new Il91874(
        spiBus: Device.CreateSpiBus(),
        chipSelectPin: Device.Pins.A04,
        dcPin: Device.Pins.A03,
        resetPin: Device.Pins.A02,
        busyPin: Device.Pins.A01,
        width: 176,
        height: 264);

    graphics = new MicroGraphics(display);

    return Task.CompletedTask;
}

public override Task Run()
{
    Resolver.Log.Info("Run ...");

    graphics.Clear();

    graphics.DrawRectangle(10, 40, 120, 60, Color.Black, true);
    graphics.DrawRectangle(20, 80, 120, 90, Color.Red, true);

    graphics.CurrentFont = new Font12x16();
    graphics.DrawText(2, 20, "Meadow F7", Color.Black);
    graphics.DrawText(30, 50, "Color", Color.Red);
    graphics.DrawText(50, 90, "Black", Color.Black);
    graphics.DrawText(50, 120, "White", Color.White);

    graphics.Show();

    return base.Run();
}

Sample project(s) available on GitHub

Wiring Example

To control a IL91874 from Meadow, connect the following:

IL91874	Meadow Pin
BUSY	D15
RST	D14
DC	D13
CS	D12
CLK	SCK
DIN	MOSI
GND	GND
3V3	3V3

If your display does not include any of the above pins, they can be omitted. Pass NULL into the constructor for the missing pin(s).

Class Il91874

Represents IL91874 ePaper color displays 264x176, 2.7inch tri color e-Ink display / SPI interface

Assembly: EPaper.dll

View Source

Declaration

public class Il91874 : EPaperTriColorBase, ISpiPeripheral, IDisposable, IPixelDisplay, IDisplay

Inheritance: System.Object -> Meadow.Foundation.Displays.EPaperBase

Derived:
Meadow.Foundation.Displays.Epd2in7b

Implements:
Meadow.Hardware.ISpiPeripheral, System.IDisposable, Meadow.Peripherals.Displays.IPixelDisplay, Meadow.Peripherals.Displays.IDisplay

Properties

IsBlackInverted

Does the display invert data for black pixels

View Source

Declaration

protected override bool IsBlackInverted { get; }

IsColorInverted

Does the display invert data for color pixels

View Source

Declaration

protected override bool IsColorInverted { get; }

Methods

Initialize()

Initialize the display

View Source

Declaration

protected override void Initialize()

Show(int, int, int, int)

Update a region of the display from the offscreen buffer

View Source

Declaration

public override void Show(int left, int top, int right, int bottom)

Parameters

Type	Name	Description
System.Int32	left	Left bounds in pixels
System.Int32	top	Top bounds in pixels
System.Int32	right	Right bounds in pixels
System.Int32	bottom	Bottom bounds in pixels

Show()

Update the display from the offscreen buffer

View Source

Declaration

public override void Show()

ClearFrame()

View Source

Declaration

public void ClearFrame()

DisplayFrame()

View Source

Declaration

public void DisplayFrame()

Sleep()

View Source

Declaration

public void Sleep()

Implements

• Meadow.Hardware.ISpiPeripheral
• System.IDisposable
• Meadow.Peripherals.Displays.IPixelDisplay
• Meadow.Peripherals.Displays.IDisplay