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: ```rust use ws2812_spi as ws2812;

use smartledsmatrix::{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::newinvertedy(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{}

} ```