3 releases (breaking)
0.2.0 | Jan 17, 2024 |
---|---|
0.1.0 | Oct 17, 2022 |
0.0.1 | Feb 6, 2022 |
#1540 in Embedded development
43 downloads per month
16KB
286 lines
Smart LEDs matrix
A DrawTarget
implementation to use (one, or more) smart LED matrixes as a graphics display driven by embedded-graphics Drawable
objects.
The integrated driver is from smart-leds crate.
Known issues (with my setup: stm32f401 + 8x8 ws2812 matrix):
- circles with the same parameters are not exactly drawn always to the same position, not sure if this is the same with bigger resolution displays or not
- write operation usually gets back with an overrun error, while the display is still updated for ~every second time (workaround: flush always twice)
Plan
- Add more display types (like 2x2 or 1x4 grids of 8x8 matrixes), though user can add those anytime by implementing another
layout
.
Usage
You may start by creating a driver for your LED and controller. Some examples can be found here.
Once you have it, you can plug it into the DrawTarget
implemented by this crate.
Example:
use ws2812_spi as ws2812;
use smart_leds_matrix::{SmartLedMatrix, layout::Rectangular};
use embedded_graphics::{
pixelcolor::*,
prelude::*,
primitives::{
PrimitiveStyleBuilder, Rectangle,
},
};
fn main() -> ! {
[...]
let ws = ws2812::Ws2812::new(spi);
let mut matrix = SmartLedMatrix::<_, _, {8 * 8}>::new(ws, Rectangular::new_inverted_y(8, 8));
matrix.set_brightness(15);
matrix.clear(Rgb888::new(0, 0, 0));
// Drawable objects are calling draw_iter() function of the matrix.
// That is, only the internal frame buffer is updated, no real
// communication happens yet. That is useful when a frame is composed
// of multiple objects, text, etc.
Rectangle::new(Point::new(1, 1), Size::new(6, 6))
.into_styled(
PrimitiveStyleBuilder::new()
.fill_color(Rgb888::RED)
.build(),
).draw(&mut matrix)?;
// Trigger the actual frame update on the matrix with gamma correction.
matrix.flush_with_gamma();
loop{}
}
Dependencies
~715KB
~12K SLoC