Meadow.Foundation.Displays.St7735

St7735
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

The ST7735 is a display controller used to drive color displays over SPI using 12, 16 or 18 bbp. These displays require a backlight. These displays are commonly found with a resolution of 128x160.

The Meadow.Foundation ST7735 driver currently only supports 16bpp RGB565.

Code Example

MicroGraphics graphics;

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

    var spiBus = Device.CreateSpiBus();

    //note - you may need to adjust the DisplayType for your specific St7735
    var display = new St7735(
        spiBus: spiBus,
        chipSelectPin: Device.Pins.D02,
        dcPin: Device.Pins.D01,
        resetPin: Device.Pins.D00,
        width: 128,
        height: 160,
        St7735.DisplayType.ST7735R);

    graphics = new MicroGraphics(display);

    return base.Initialize();
}

public override Task Run()
{
    graphics.Clear();

    graphics.DrawCircle(60, 60, 20, Color.Purple);
    graphics.DrawRectangle(10, 10, 30, 60, Color.Red);
    graphics.DrawTriangle(20, 20, 10, 70, 60, 60, Color.Green);

    graphics.DrawCircle(90, 60, 20, Color.Cyan, true);
    graphics.DrawRectangle(100, 100, 30, 10, Color.Yellow, true);
    graphics.DrawTriangle(120, 20, 110, 70, 160, 60, Color.Pink, true);

    graphics.DrawLine(10, 120, 110, 130, Color.SlateGray);

    graphics.Show();

    return base.Run();
}

Sample project(s) available on GitHub

Wiring Example

To wire a ST7735 to your Meadow board, connect the following:

ST7735	Meadow Pin
LED-	3V3
LED+	GND
MOSI	MOSI
SCK	SCK
RESET	D15
A0	D14
CS	D13
VCC	3V3
GND	GND

It should look like the following diagram:

Class St7735

Represents a St7735 TFT color display

Assembly: TftSpi.dll

View Source

Declaration

public class St7735 : TftSpiBase, IPixelDisplay, IDisplay, ISpiPeripheral, IDisposable

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

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

Properties

DefaultColorMode

The default display color mode

View Source

Declaration

public override ColorMode DefaultColorMode { get; }

SupportedColorModes

The color modes supported by the display

View Source

Declaration

public override ColorMode SupportedColorModes { get; }

Methods

Initialize()

Initialize the display

View Source

Declaration

protected override void Initialize()

SetAddressWindow(int, int, int, int)

Set address window for display updates

View Source

Declaration

protected override void SetAddressWindow(int x0, int y0, int x1, int y1)

Parameters

Type	Name	Description
System.Int32	x0	X start in pixels
System.Int32	y0	Y start in pixels
System.Int32	x1	X end in pixels
System.Int32	y1	Y end in pixels

Implements

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