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Faithful Rust port of Maurycy's mcufont.h — a 5x5 monospace pixel
font (~350 bytes of bitmap data) covering A-Z, a-z, 0-9, and the
punctuation set - + . , ? ! : = '.

- no_std, forbid(unsafe_code), zero deps with default features.
- Public glyph tables (UPPER / LOWER / DIGITS / SYMBOLS), SYM_*
  index constants, and a glyph(c: char) lookup.
- Each glyph row is packed in bits 7..=3 MSB-first so the bytes
  are byte-for-byte compatible with embedded_graphics::ImageRaw.
- Optional `embedded-graphics` feature exposes MCU_FONT
  (MonoFont<'static>), FONT_DATA, and McuGlyphMapping for drop-in
  use with MonoTextStyle / Text on any DrawTarget (SSD1306 over
  I²C, ST7735, etc.).
- Per-category feature flags (upper / lower / numbers / symbols,
  all on by default) so users can drop unused glyphs from flash.

Licensed CC BY-NC-SA 4.0, inherited from the upstream font data.
An email is out to the upstream author asking for a permissive
software license (MIT / Apache-2.0); if granted, the crate will
be relicensed and a new version published.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-29 13:36:29 -06:00

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Pending

Relicense. An email is out to the upstream author requesting a permissive software license (MIT / Apache-2.0) on the original C source. If granted, this crate will be relicensed and the next release will reflect the new terms. Until then, CC BY-NC-SA 4.0 applies.

[0.1.0] - 2026-04-29

Added

Initial release. Faithful Rust port of Maurycy's mcufont.h (https://maurycyz.com/projects/mcufont/) — a 5×5 monospace pixel font, ~350 bytes of bitmap data, covering A–Z, a–z, 0–9, and - + . , ? ! : = '.
no_std, forbid(unsafe_code), zero dependencies with default features.
Public glyph tables: UPPER, LOWER, DIGITS, SYMBOLS.
glyph(c: char) -> Option<&'static Glyph> lookup function.
SYM_* index constants for direct symbol-table access.
Feature flags: upper, lower, numbers, symbols (all on by default) — disable individually to save flash.
Optional embedded-graphics feature exposing eg::MCU_FONT (MonoFont<'static>), eg::FONT_DATA, and eg::McuGlyphMapping for drop-in use with MonoTextStyle / Text on any DrawTarget (SSD1306 over I²C, ST7735, etc.).
Glyph bytes packed in bits 7..=3 (MSB-first), bits 2..=0 zero — layout matches embedded_graphics::image::ImageRaw so the same data serves both APIs.

Licensed under

CC BY-NC-SA 4.0 (inherited from the upstream font data; see LICENSE). Non-commercial use only, ShareAlike. See README for implications and the pending relicense note.

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