Crate bunting 

Pure Rust WS2812 color utilities.

This crate provides hardware-independent color conversion and bit manipulation utilities for WS2812 (NeoPixel) LEDs. It has no ESP or embedded dependencies, making it fully testable on any platform.

SPI Pre-rendering

prerender_spi encodes &[RGB8] into a byte buffer suitable for SPI-based WS2812 transmission (4 SPI bits per WS2812 data bit, 12 bytes per LED). The encoding is byte-for-byte compatible with ws2812-spi v0.5.1’s prerendered module.

Grid primitives

The grid module provides GridLayout, GridBuffer, and gamma/brightness helpers for addressing WS2812 LEDs wired as a rectangular matrix.

Modules

grid

Grid coordinate mapping, gamma correction, and brightness scaling.

Enums

SpiEncodeError

Error returned by prerender_spi when the output buffer is too small.

Constants

SPI_RESET_BYTES_2MHZ

Minimum reset bytes for 2 MHz SPI clock.

Functions

color_to_bits

Extracts bit values from a 24-bit color for WS2812 transmission.

prerender_spi

Pre-renders colors into a WS2812-compatible SPI byte buffer.

rgb_to_grb

Converts RGB to GRB u32 format (WS2812 color order).

spi_data_len

Returns the number of SPI data bytes required to encode num_leds LEDs.