kopia lustrzana https://github.com/pimoroni/pimoroni-pico
207 wiersze
7.9 KiB
Markdown
207 wiersze
7.9 KiB
Markdown
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# Pico Display Pack - MicroPython <!-- omit in toc -->
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Pico Display 2.0" Pack is a vibrant 2.0", 320 x 240 pixel IPS LCD screen for your Raspberry Pi Pico, with four useful buttons and a RGB LED. [Click here](https://shop.pimoroni.com/products/pico-display-pack) to find out more!
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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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Check out [UnfinishedStuff's excellent Display Pack guide](https://github.com/UnfinishedStuff/Pimoroni_Pico_Display_Pack_documentation) for more detail on the functions and code examples, and [tonygo2's Display Pack Workout](https://www.instructables.com/Pimoroni-Pico-Display-Workout/) for a comprehensive demo!
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- [Example Program](#example-program)
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- [Function Reference](#function-reference)
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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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- [set_pen](#set_pen)
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- [create_pen](#create_pen)
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- [clear](#clear)
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- [pixel](#pixel)
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- [pixel_span](#pixel_span)
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- [rectangle](#rectangle)
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- [circle](#circle)
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- [character](#character)
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- [text](#text)
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- [set_clip](#set_clip)
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- [remove_clip](#remove_clip)
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## Example Program
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The following example sets up Pico Display, displays some basic demo text and illuminates the RGB LED green when the A button is pressed.
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```python
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import utime
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import picodisplay2 as picodisplay
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# Initialise Picodisplay with a bytearray display buffer
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buf = bytearray(picodisplay.get_width() * picodisplay.get_height() * 2)
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picodisplay.init(buf)
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picodisplay.set_backlight(1.0)
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picodisplay.set_pen(255, 0, 0) # Set a red pen
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picodisplay.clear() # Clear the display buffer
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picodisplay.set_pen(255, 255, 255) # Set a white pen
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picodisplay.text("pico display", 10, 10, 240, 6) # Add some text
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picodisplay.update() # Update the display with our changes
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picodisplay.set_led(255, 0, 0) # Set the RGB LED to red
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utime.sleep(1) # Wait for a second
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picodisplay.set_led(0, 255, 0) # Set the RGB LED to green
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utime.sleep(1) # Wait for a second
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picodisplay.set_led(0, 0, 255) # Set the RGB LED to blue
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while picodisplay.is_pressed(picodisplay.BUTTON_A) == False:
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pass
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picodisplay.set_led(0, 255, 0) # Set the RGB LED to green
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```
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## 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. `init()` needs a bytearray type display buffer that MicroPython's garbage collection isn't going to eat, make sure you create one and pass it in like so:
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```python
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buf = bytearray(picodisplay.get_width() * picodisplay.get_height() * 2)
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picodisplay.init(buf)
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```
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### set_backlight
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Sets the display backlight from 0.0 to 1.0.
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```python
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picodisplay.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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```python
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picodisplay.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 `True` if it's pressed and `False` if it is released.
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```python
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picodisplay.is_pressed(button)
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```
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The button value should be a number denoting a pin, and constants `picodisplay.BUTTON_A`, `picodisplay.BUTTON_B`, `picodisplay.BUTTON_X` and `picodisplay.BUTTON_Y` are supplied to make it easier. e:
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```python
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is_a_button_pressed = picodisplay.is_pressed(picodisplay.BUTTON_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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```python
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picodisplay.update()
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```
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### set_pen
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Sets the colour to be used by subsequent calls to drawing functions. The values for `r`, `g` and `b` should be from 0-255 inclusive.
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```python
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picodisplay.set_pen(r, g, b)
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```
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### create_pen
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Creates a pen which can be stored as a variable for faster re-use of the same colour through calls to `set_pen`. The values for `r`, `g` and `b` should be from 0-255 inclusive.
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```python
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pen_colour = picodisplay.create_pen(r, g, b)
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picodisplay.set_pen(penColour)
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```
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### clear
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Fills the display buffer with the currently set pen colour.
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```python
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picodisplay.clear()
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```
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### pixel
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Sets a single pixel in the display buffer to the current pen colour. The `x` and `y` parameters determine the X and Y coordinates of the drawn pixel in the buffer.
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```python
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picodisplay.pixel(x, y)
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```
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### pixel_span
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Draws a horizontal line of pixels to the buffer. The `x` and `y` parameters specify the coordinates of the first pixel of the line. The `l` parameter describes the length of the line in pixels. This function will only extend the line towards the end of the screen, i.e. the `x` coordinate should specify the left hand extreme of the line.
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```python
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picodisplay.pixel_span(x, y, l)
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```
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### rectangle
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Draws a rectangle filled with the current pen colour to the buffer. The `x` and `y` parameters specify the upper left corner of the rectangle, `w` specifies the width in pixels, and `h` the height.
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```python
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picodisplay.rectangle(x, y, w, h)
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```
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![Rectangle function explanation image](/micropython/modules/pico_display/images/rectangle.png)
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### circle
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Draws a circle filled with the current pen colour to the buffer. The `x` and `y` parameters specify the centre of the circle, `r` specifies the radius in pixels.
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```python
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picodisplay.circle(x, y, r)
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```
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![Circle function explanation image](/micropython/modules/pico_display/images/circle.png)
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### character
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Draws a single character to the display buffer in the current pen colour. The `c` parameter should be the ASCII numerical representation of the character to be printed, `x` and `y` describe the top-left corner of the character's drawing field. The `character` function can also be given an optional 4th parameter, `scale`, describing the scale of the character to be drawn. Default value is 2.
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```python
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char_a = ord('a')
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picodisplay.character(char_a, x, y)
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picodisplay.character(char_a, x, y, scale)
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```
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### text
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Draws a string of text to the display buffer in the current pen colour. The `string` parameter is the string of text to be drawn, and `x` and `y` specify the upper left corner of the drawing field. The `wrap` parameter describes the width, in pixels, after which the next word in the string will be drawn on a new line underneath the current text. This will wrap the string over multiple lines if required. This function also has an optional parameter, `scale`, which describes the size of the characters to be drawn. The default `scale` is 2.
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```python
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picodisplay.text(string, x, y, wrap)
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picodisplay.text(string, x, y, wrap, scale)
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```
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![Text scale explanation image](/micropython/modules/pico_display/images/text_scale.png)
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### set_clip
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This function defines a rectangular area outside which no drawing actions will take effect. If a drawing action crosses the boundary of the clip then only the pixels inside the clip will be drawn. Note that `clip` does not remove pixels which have already been drawn, it only prevents new pixels being drawn outside the described area. A more visual description of the function of clips can be found below. Only one clip can be active at a time, and defining a new clip replaces any previous clips. The `x` and `y` parameters describe the upper-left corner of the clip area, `w` and `h` describe the width and height in pixels.
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```python
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picodisplay.set_clip(x, y, w, h)
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```
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![Clip function explanation image](/micropython/modules/pico_display/images/clip.png)
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### remove_clip
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This function removes any currently implemented clip.
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