pimoroni-pico/libraries/pico_display_2/README.md

# Pico Display 2.0" Pack <!-- omit in toc -->

Our Pico Display Pack offers a vibrant 2.0" (320x240) IPS LCD screen for your Raspberry Pi Pico it also includes four switches and and an RGB LED!

- [Example Program](#example-program)
- [Function Reference](#function-reference)
  - [PicoGraphics](#picographics)
  - [ST7789](#st7789)

## Example Program

The following example sets up Pico Display, displays some basic demo text and graphics and will illuminate the RGB LED green if the A button is pressed.

```c++
#include "pico_display_2.hpp"
#include "drivers/st7789/st7789.hpp"
#include "libraries/pico_graphics/pico_graphics.hpp"
#include "rgbled.hpp"
#include "button.hpp"

// Display driver
ST7789 st7789(PicoDisplay2::WIDTH, PicoDisplay2::HEIGHT, ROTATE_0, false, get_spi_pins(BG_SPI_FRONT));

// Graphics library - in RGB332 mode you get 256 colours and optional dithering for 75K RAM.
PicoGraphics_PenRGB332 graphics(st7789.width, st7789.height, nullptr);

// RGB LED
RGBLED led(PicoDisplay2::LED_R, PicoDisplay2::LED_G, PicoDisplay2::LED_B);

// And each button
Button button_a(PicoDisplay2::A);
Button button_b(PicoDisplay2::B);
Button button_x(PicoDisplay2::X);
Button button_y(PicoDisplay2::Y);

int main() {

    // set the backlight to a value between 0 and 255
    // the backlight is driven via PWM and is gamma corrected by our
    // library to give a gorgeous linear brightness range.
    st7789.set_backlight(100);

    while(true) {
        // detect if the A button is pressed (could be A, B, X, or Y)
        if(button_a.raw(display.A)) {
            // make the led glow green
            // parameters are red, green, blue all between 0 and 255
            // these are also gamma corrected
            led.set_rgb(0, 255, 0);
        }

        // set the colour of the pen
        // parameters are red, green, blue all between 0 and 255
        graphics.set_pen(30, 40, 50);

        // fill the screen with the current pen colour
        graphics.clear();

        // draw a box to put some text in
        graphics.set_pen(10, 20, 30);
        Rect text_rect(10, 10, 150, 150);
        graphics.rectangle(text_rect);

        // write some text inside the box with 10 pixels of margin
        // automatically word wrapping
        text_rect.deflate(10);
        graphics.set_pen(110, 120, 130);
        graphics.text("This is a message", Point(text_rect.x, text_rect.y), text_rect.w);

        // now we've done our drawing let's update the screen
        st7789.update(&graphics);
    }
}
```

## Function Reference

### PicoGraphics

Pico Display uses our Pico Graphics library to draw graphics and text. For more information [read the Pico Graphics function reference.](../pico_graphics/README.md#function-reference).

### ST7789

Pico Display uses the ST7789 display driver to handle the LCD. For more information [read the ST7789 README.](../../drivers/st7789/README.md).