Remarks

Pcd8544
Status
Source code	GitHub
Datasheet(s)	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

• NOKIA 5110 SPI LCD graphic display 84x48

Code Example

MicroGraphics graphics;

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

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

    var display = new Pcd8544
    (
        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 MicroGraphics(display);

    return base.Initialize();
}

public override Task Run()
{
    graphics.Clear(true);
    graphics.CurrentFont = new Font8x12();
    graphics.DrawText(0, 0, "PCD8544");
    graphics.DrawRectangle(5, 14, 30, 10, true);

    graphics.Show();

    return base.Run();
}

Sample project(s) 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 > Pcd8544
Namespace	Meadow.Foundation.Displays
Assembly	Pcd8544.dll

Syntax

public class Pcd8544 : IGraphicsDisplay

Constructors

Pcd8544(ISpiBus, IDigitalOutputPort, IDigitalOutputPort, IDigitalOutputPort)

Create a new Pcd8544 display object

Declaration

public Pcd8544(ISpiBus spiBus, IDigitalOutputPort chipSelectPort, IDigitalOutputPort dataCommandPort, IDigitalOutputPort resetPort)

Parameters

Type	Name	Description
ISpiBus	spiBus	SPI bus connected to display
IDigitalOutputPort	chipSelectPort	Chip select output port
IDigitalOutputPort	dataCommandPort	Data command output port
IDigitalOutputPort	resetPort	Reset output port

Pcd8544(ISpiBus, IPin, IPin, IPin)

Create a Pcd8544 object

Declaration

public Pcd8544(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin)

Parameters

Type	Name	Description
ISpiBus	spiBus	SPI bus connected to display
IPin	chipSelectPin	Chip select pin
IPin	dcPin	Data command pin
IPin	resetPin	Reset pin

Fields

commandBuffer

Buffer to hold internal command data to be sent over the SPI bus

Declaration

protected Memory<byte> commandBuffer

Field Value

Type	Description
Memory<System.Byte>

DEFAULT_SPEED

Default SPI bus speed

Declaration

public static Frequency DEFAULT_SPEED

Field Value

Type	Description
Frequency

imageBuffer

Buffer to hold display data

Declaration

protected Buffer1bpp imageBuffer

Field Value

Type	Description
Buffer1bpp

Properties

ColorMode

Display color mode

Declaration

public ColorMode ColorMode { get; }

Property Value

Type	Description
ColorMode

Height

Height of display in pixels

Declaration

public int Height { get; }

Property Value

Type	Description
System.Int32

IsDisplayInverted

Is the display inverted

Declaration

public bool IsDisplayInverted { get; }

Property Value

Type	Description
System.Boolean

PixelBuffer

The buffer the holds the pixel data for the display

Declaration

public IPixelBuffer PixelBuffer { get; }

Property Value

Type	Description
IPixelBuffer

SupportedColorModes

The Color mode supported by the display

Declaration

public ColorMode SupportedColorModes { get; }

Property Value

Type	Description
ColorMode

Width

Width of display in pixels

Declaration

public int Width { get; }

Property Value

Type	Description
System.Int32

Methods

Clear(Boolean)

Clear the display

Declaration

public void Clear(bool updateDisplay = false)

Parameters

Type	Name	Description
System.Boolean	updateDisplay	If true, it will force a display update

Remarks

Clears the internal memory buffer

DrawPixel(Int32, Int32, Color)

Draw pixel at location

Declaration

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

Parameters

Type	Name	Description
System.Int32	x	x position in pixels
System.Int32	y	y position in pixels
Color	color	any value other than black will make the pixel visible

DrawPixel(Int32, Int32, Boolean)

Draw pixel at location

Declaration

public void DrawPixel(int x, int y, bool enabled)

Parameters

Type	Name	Description
System.Int32	x	x position in pixels
System.Int32	y	y position in pixels
System.Boolean	enabled	True = turn on pixel, false = turn off pixel

Fill(Color, Boolean)

Fill with color

Declaration

public void Fill(Color fillColor, bool updateDisplay = false)

Parameters

Type	Name	Description
Color	fillColor	color - converted to on/off
System.Boolean	updateDisplay	should refresh display

Fill(Int32, Int32, Int32, Int32, Color)

Fill region with color

Declaration

public void Fill(int x, int y, int width, int height, Color fillColor)

Parameters

Type	Name	Description
System.Int32	x	x position
System.Int32	y	y position
System.Int32	width	width of region
System.Int32	height	height of region
Color	fillColor	color - converted to on/off

InvertDisplay(Boolean)

Invert the entire display

Declaration

public void InvertDisplay(bool inverse)

Parameters

Type	Name	Description
System.Boolean	inverse	Invert if true, normal if false

InvertPixel(Int32, Int32)

Invert pixel at a location

Declaration

public void InvertPixel(int x, int y)

Parameters

Type	Name	Description
System.Int32	x	x position in pixels
System.Int32	y	y position in pixels

Show()

Update the display

Declaration

public void Show()

Show(Int32, Int32, Int32, Int32)

Update a region of the display Currently always does a full screen update for this display

Declaration

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

Parameters

Type	Name	Description
System.Int32	left	The left position in pixels
System.Int32	top	The top position in pixels
System.Int32	right	The right position in pixels
System.Int32	bottom	The bottom position in pixels

WriteBuffer(Int32, Int32, IPixelBuffer)

Draw buffer at location

Declaration

public void WriteBuffer(int x, int y, IPixelBuffer displayBuffer)

Parameters

Type	Name	Description
System.Int32	x	x position in pixels
System.Int32	y	y position in pixels
IPixelBuffer	displayBuffer	buffer to draw