Remarks

PCD8544
Status
Source code GitHub
NuGet package

The PCD8544 display, also known as a Nokia 5110 LCD, is a single color 84x84 LCD display. Data is sent to the display via SPI. The also typically also include an led backlight controlled via a single pin.

These displays have excellent visibility in daylight, even without the backlight, making them a good choice for builds with low-power restrictions and require visibility is bright light or daylight.

Purchasing

Code Example

public class MeadowApp : App<F7Micro, MeadowApp>
{
    Pcd8544 display;
    GraphicsLibrary graphics;

    public MeadowApp()
    {
        Console.WriteLine("Initializing...");

        var config = new Meadow.Hardware.SpiClockConfiguration(
            Pcd8544.DEFAULT_SPEED, 
            Meadow.Hardware.SpiClockConfiguration.Mode.Mode0);

        display = new Pcd8544
        (
            device: Device,
            spiBus: Device.CreateSpiBus(
                Device.Pins.SCK, 
                Device.Pins.MOSI, 
                Device.Pins.MISO, 
                config),
            chipSelectPin: Device.Pins.D01,
            dcPin: Device.Pins.D00,
            resetPin: Device.Pins.D02
        );

        graphics = new GraphicsLibrary(display);
        graphics.Rotation = GraphicsLibrary.RotationType._180Degrees;

        TestPcd8544();
    }

    void TestPcd8544() 
    {
        Console.WriteLine("TestPcd8544...");

        // Drawing with Display Graphics Library
        graphics.Clear(true);
        graphics.CurrentFont = new Font8x12();
        graphics.DrawText(0, 0, "PCD8544");
        graphics.DrawRectangle(5, 14, 30, 10, true);

        graphics.Show();
    }
}

Sample projects available on GitHub

Wiring Example

To wire a PCD8544 to your Meadow board, connect the following:

PCD8544 Meadow Pin
GND GND
LIGHT GND
VCC 3V3
CLK SCK
DIN MOSI
DC D00
CE D01
RST D02

Characteristic Locus
Inheritance System.Object DisplayBase > Pcd8544
Inherited Members DisplayBase.IgnoreOutOfBoundsPixels
Namespace Meadow.Foundation.Displays
Assembly Pcd8544.dll

Syntax

public class Pcd8544 : DisplayBase

Constructors

Pcd8544(IIODevice, ISpiBus, IPin, IPin, IPin)

Declaration
public Pcd8544(IIODevice device, ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin)

Parameters

Type Name Description
IIODevice device
ISpiBus spiBus
IPin chipSelectPin
IPin dcPin
IPin resetPin

Fields

_invertDisplay

Declaration
protected bool _invertDisplay

Field Value

Type Description
System.Boolean

chipSelectPort

Declaration
protected IDigitalOutputPort chipSelectPort

Field Value

Type Description
IDigitalOutputPort

currentPen

Declaration
protected Color currentPen

Field Value

Type Description
Color

dataCommandPort

Declaration
protected IDigitalOutputPort dataCommandPort

Field Value

Type Description
IDigitalOutputPort

DEFAULT_SPEED

Declaration
public static int DEFAULT_SPEED

Field Value

Type Description
System.Int32

displayBuffer

Declaration
protected byte[] displayBuffer

Field Value

Type Description
System.Byte[]

resetPort

Declaration
protected IDigitalOutputPort resetPort

Field Value

Type Description
IDigitalOutputPort

spi

Declaration
protected SpiBus spi

Field Value

Type Description
SpiBus

spiDisplay

Declaration
protected ISpiPeripheral spiDisplay

Field Value

Type Description
ISpiPeripheral

spiReceive

Declaration
protected readonly byte[] spiReceive

Field Value

Type Description
System.Byte[]

Properties

ColorMode

Declaration
public override DisplayBase.DisplayColorMode ColorMode { get; }

Property Value

Type Description
DisplayBase.DisplayColorMode

Overrides

Height

Declaration
public override int Height { get; }

Property Value

Type Description
System.Int32

Overrides

InvertDisplay

Declaration
public bool InvertDisplay { get; set; }

Property Value

Type Description
System.Boolean

Width

Declaration
public override int Width { get; }

Property Value

Type Description
System.Int32

Overrides

Methods

Clear(Boolean)

Clear the display

Declaration
public override void Clear(bool updateDisplay = false)

Parameters

Type Name Description
System.Boolean updateDisplay

If true, it will force a display update

Overrides

Remarks

Clears the internal memory buffer

DrawPixel(Int32, Int32)

Coordinates start with index 0

Declaration
public override void DrawPixel(int x, int y)

Parameters

Type Name Description
System.Int32 x

Abscissa of the pixel to the set / reset.

System.Int32 y

Ordinate of the pixel to the set / reset.

Overrides

DrawPixel(Int32, Int32, Color)

Coordinates start with index 0

Declaration
public override void DrawPixel(int x, int y, Color color)

Parameters

Type Name Description
System.Int32 x

Abscissa of the pixel to the set / reset.

System.Int32 y

Ordinate of the pixel to the set / reset.

Color color

any value other than black will make the pixel visible

Overrides

DrawPixel(Int32, Int32, Boolean)

Coordinates start with index 0

Declaration
public override void DrawPixel(int x, int y, bool colored)

Parameters

Type Name Description
System.Int32 x

Abscissa of the pixel to the set / reset.

System.Int32 y

Ordinate of the pixel to the set / reset.

System.Boolean colored

True = turn on pixel, false = turn off pixel

Overrides

InvertPixel(Int32, Int32)

Declaration
public override void InvertPixel(int x, int y)

Parameters

Type Name Description
System.Int32 x
System.Int32 y

Overrides

SetPenColor(Color)

Declaration
public override void SetPenColor(Color pen)

Parameters

Type Name Description
Color pen

Overrides

Show()

Declaration
public override void Show()

Overrides