kopia lustrzana https://github.com/pimoroni/pimoroni-pico
124 wiersze
3.9 KiB
Markdown
124 wiersze
3.9 KiB
Markdown
# Pico Display Pack <!-- omit in toc -->
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Our Pico Display Pack offers a vibrant 1.14" (240x135) IPS LCD screen for your Raspberry Pi Pico it also includes four switches and and an RGB LED!
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We've included helper functions to handle every aspect of drawing to the screen and interfacing with the buttons and LED. See the [function reference](#function-reference) for details.
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- [Example Program](#example-program)
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- [Function Reference](#function-reference)
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- [PicoGraphics](#picographics)
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- [init](#init)
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- [set_backlight](#set_backlight)
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- [set_led](#set_led)
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- [is_pressed](#is_pressed)
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- [update](#update)
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## Example Program
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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.
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```c++
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#include "pico_display.hpp"
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using namespace pimoroni;
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uint16_t buffer[PicoDisplay::WIDTH * PicoDisplay::HEIGHT];
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PicoDisplay pico_display(buffer);
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int main() {
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pico_display.init();
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// set the backlight to a value between 0 and 255
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// the backlight is driven via PWM and is gamma corrected by our
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// library to give a gorgeous linear brightness range.
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pico_display.set_backlight(100);
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while(true) {
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// detect if the A button is pressed (could be A, B, X, or Y)
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if(pico_display.is_pressed(pico_display.A)) {
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// make the led glow green
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// parameters are red, green, blue all between 0 and 255
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// these are also gamma corrected
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pico_display.set_led(0, 255, 0);
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}
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// set the colour of the pen
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// parameters are red, green, blue all between 0 and 255
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pico_display.set_pen(30, 40, 50);
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// fill the screen with the current pen colour
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pico_display.clear();
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// draw a box to put some text in
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pico_display.set_pen(10, 20, 30);
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Rect text_rect(10, 10, 150, 150);
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pico_display.rectangle(text_rect);
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// write some text inside the box with 10 pixels of margin
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// automatically word wrapping
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text_rect.deflate(10);
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pico_display.set_pen(110, 120, 130);
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pico_display.text("This is a message", Point(text_rect.x, text_rect.y), text_rect.w);
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// now we've done our drawing let's update the screen
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pico_display.update();
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}
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}
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```
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## Function Reference
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### PicoGraphics
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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).
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### init
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Sets up Pico Display. `init` must be called before any other functions since it configures the required PWM and GPIO:
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```c++
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pico_display.init();
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```
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### set_backlight
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Set the display backlight from 0-255.
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```c++
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pico_display.set_backlight(brightness);
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```
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Uses hardware PWM to dim the display backlight, dimming values are gamma-corrected to provide smooth brightness transitions across the full range of intensity. This may result in some low values mapping as "off."
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### set_led
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Sets the RGB LED on Pico Display with an RGB triplet:
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```c++
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pico_display.set_led(r, g, b);
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```
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Uses hardware PWM to drive the LED. Values are automatically gamma-corrected to provide smooth brightness transitions and low values may map as "off."
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### is_pressed
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Reads the GPIO pin connected to one of Pico Display's buttons, returning a `bool` - `true` if it's pressed and `false` if it is released.
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```c++
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pico_display.is_pressed(button);
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```
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The button vaule should be a `uint8_t` denoting a pin, and constants `A`, `B`, `X` and `Y` are supplied to make it easier. e:
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```c++
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bool is_a_button_pressed = pico_display.is_pressed(PicoDisplay::A)
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```
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### update
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To display your changes on Pico Display's screen you need to call `update`:
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```c++
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pico_display.update();
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```
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