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‎.github/workflows/build.yml

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name: build
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on:
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- push
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- pull_request
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env:
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CARGO_TERM_COLOR: always
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jobs:
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rust:
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runs-on: ${{ matrix.os }}
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strategy:
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matrix:
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os: [macos-latest, ubuntu-latest, windows-latest]
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steps:
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- uses: actions/checkout@v2
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- uses: dorny/paths-filter@v2
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id: changes
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with:
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filters: |
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rust:
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- '**.rs'
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- 'Cargo.lock'
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- '.github/workflows/**'
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- if: steps.changes.outputs.rust == 'true'
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run: cargo build
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rustdoc:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- uses: dorny/paths-filter@v2
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id: changes
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with:
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filters: |
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rust:
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- '**.rs'
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- 'Cargo.lock'
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- '.github/workflows/**'
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- if: steps.changes.outputs.rust == 'true'
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run: cargo doc

‎.github/workflows/lint.yml

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name: lint
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on:
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- push
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- pull_request
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env:
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CARGO_TERM_COLOR: always
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jobs:
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rustfmt:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- uses: dorny/paths-filter@v2
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id: changes
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with:
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filters: |
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rust:
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- '**.rs'
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- 'rustfmt.toml'
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- '.github/workflows/**'
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- if: steps.changes.outputs.rust == 'true'
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uses: actions-rs/toolchain@v1
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with:
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toolchain: nightly
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components: rustfmt
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override: true
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- if: steps.changes.outputs.rust == 'true'
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run: cargo fmt --check
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‎.gitignore

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Cargo.lock
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/target/
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**/*.rs.bk

‎Cargo.toml

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[package]
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name = "hcms-29xx"
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version = "0.1.0"
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edition = "2021"
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authors = ["Nick Brown <nick@altonimb.us>"]
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categories = ["embedded", "no-std"]
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description = "Driver for HCMS-29XX and HCMS-39XX display ICs"
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license = "MIT"
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repository = "https://github.com/nonik0/hcms-29xx"
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readme = "README.md"
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[dependencies]
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embedded-hal = "1.0.0"
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avr-progmem = "0.4.0" # TODO: use as feature
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# The latest releases of `proc-macro2` do not support the rust toolchain that
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# we use. Thus, we must fix this dependency to an older version where our
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# toolchain is still supported. See https://github.com/Rahix/avr-hal/issues/537
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[build-dependencies.proc-macro2]
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version = "=1.0.79"
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#[[example]]
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#name = "arduino-uno"
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#[dependencies.arduino-hal]
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#path = "../../arduino-hal/"
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#features = ["arduino-uno"]

‎README.md

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# HCMS-29xx Driver
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[![Crates.io](https://img.shields.io/crates/v/hcms-29xx)](https://crates.io/crates/hcms-29xx)
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[![Crates.io](https://img.shields.io/crates/d/hcms-29xx)](https://crates.io/crates/hcms-29xx)
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[![docs.rs](https://img.shields.io/docsrs/hcms-29xx)](https://docs.rs/hcms-29xx/latest/hcms-29xx/)
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[![lint](https://github.com/gleich/hcms-29xx/actions/workflows/lint.yml/badge.svg)](https://github.com/gleich/hcms-29xx/actions/workflows/lint.yml)
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[![build](https://github.com/gleich/hcms-29xx/actions/workflows/build.yml/badge.svg)](https://github.com/gleich/hcms-29xx/actions/workflows/build.yml)
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Driver for [HCMS-29XX](https://docs.broadcom.com/doc/HCMS-29xx-Series-High-Performance-CMOS-5-x-7-Alphanumeric-Displays) and [HCMS-39XX](https://docs.broadcom.com/doc/AV02-0868EN) display ICs. Many thanks for @Andy4495's existing [HCMS39XX](https://github.com/Andy4495/HCMS39xx) Arduino/C++ library, which I used for a reference implementation.
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## Features:
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* Single dependency on embedded-hal v1.0
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* Examples for Arduino Uno using avr-hal
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* TBD
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## Install
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To install this driver in your project add the following line to your `Cargo.toml`'s `dependencies` table:
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```toml
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hcms-29xx = "0.1.0"
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```
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## TODO
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- [ ] Arduino Uno sample
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- [ ] Test on other hardware, add feature flags if needed for specific functionality (e.g. progmem for AVR)
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- [ ] Katakana font

‎examples/arduino-uno.rs

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#![no_std]
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#![no_main]
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use panic_halt as _;
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const NUM_CHARS: usize = 8;
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const MESSAGE: &[u8] = b"Hello from Rust on Arduino!";
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#[arduino_hal::entry]
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fn main() -> ! {
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let dp = arduino_hal::Peripherals::take().unwrap();
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let pins = arduino_hal::pins!(dp);
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// modify pin assignments to match wiring, if optional pins are not specified the logic
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// level must set as appropriate externally with pull-up/down resistors or other means
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let mut display = hcms29xx::Hcms29xx::new(
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NUM_CHARS, // Number of characters in the display
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pins.d0.into_output().downgrade(), // Data pin
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pins.d1.into_output().downgrade(), // Clock pin
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pins.d2.into_output().downgrade(), // Chip select pin
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pins.d3.into_output().downgrade(), // Reset pin
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Some(pins.d4.into_output().downgrade()), // Optional: Enable pin
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Some(pins.d5.into_output().downgrade()), // Optional: Write pin
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Some(pins.d6.into_output().downgrade()), // Optional: Read pin
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)
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.unwrap();
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display.begin().unwrap();
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display.display_unblank().unwrap();
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display.set_current(1).unwrap(); // set current (0-3) to 1
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//display.set_brightness(15).unwrap(); // set brightness (0-15) to max
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//display.set_int_osc().unwrap(); // set internal oscillator (default internal)
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// show a scrolling message, wrapping around at the end
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let mut cursor: usize = 0;
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loop {
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let mut buf = [0; NUM_CHARS];
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for i in 0..NUM_CHARS {
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let index = (cursor + i as usize) % MESSAGE.len();
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buf[i as usize] = MESSAGE[index];
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}
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display.print_c_string(&buf).unwrap();
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cursor = (cursor + 1) % MESSAGE.len();
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arduino_hal::delay_ms(30);
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}
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}

‎rust-toolchain.toml

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[toolchain]
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channel = "nightly-2024-03-22"
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components = ["rust-src"]
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profile = "minimal"

‎src/constants.rs

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pub const CHAR_WIDTH: usize = 5;
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pub const CHAR_HEIGHT: usize = 7;
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pub const DEVICE_CHARS: usize = 4;
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pub const CONTROL_WORD_SELECT_BIT: u8 = 0b1000_0000; // low: control word 0, high: control word 1
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pub mod control_word_0 {
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pub const BRIGHTNESS_MASK: u8 = 0b0000_1111;
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pub const CURRENT_MASK: u8 = 0b0011_0000;
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pub const WAKE_BIT: u8 = 0b0100_0000;
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pub const MAX_BRIGHTNESS: u8 = 15;
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pub const DEFAULT_BRIGHTNESS: u8 = 12;
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pub const DEFAULT_CURRENT: u8 = current::MAX_4_0MA;
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pub mod current {
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pub const MAX_4_0MA: u8 = 0b0010_0000;
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pub const MAX_6_4MA: u8 = 0b0001_0000;
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pub const MAX_9_3MA: u8 = 0b0000_0000;
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pub const MAX_12_8MA: u8 = 0b0011_0000;
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}
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}
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pub mod control_word_1 {
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pub const DATA_OUT_BIT: u8 = 0b0000_0001; // low: serial, high: simultaneous
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pub const EXT_OSC_PRESCALER_BIT: u8 = 0b0000_0010; // low: clock/1, clock/8
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pub const DEFAULT_DATA_OUT_MODE: u8 = DATA_OUT_BIT;
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}

‎src/font5x7.rs

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// derived from https://github.com/Andy4495/HCMS39xx/blob/main/src/font5x7.h
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use avr_progmem::progmem;
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progmem! {
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pub static progmem FONT5X7: [u8;770] = [
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// Character 0x00 is not printable since 0x00 is used to indicate NULL terminator in c-strings
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// So use the first bitmap slot (5 elements) in the array to specify the Font meta-data:
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// ASCII offset, last ASCII character, don't care, don't care, don't care
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// ASCII offset is the ASCII value of the first defined bitmap in this table. It should never be less than 1.
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0x01, 0x99, 0x00, 0x00, 0x00, // 0x00
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// The first 32 ASCII codes (0x00 to 0x1F) are normally non-printable control characters.
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// So use these slots for characters not defined by ASCII
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0x30, 0x48, 0x45, 0x40, 0x20, // 0x01 (inverted question mark) - changed from 0x30, 0x45, 0x48, 0x40, 0x30
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0x45, 0x29, 0x11, 0x29, 0x45, // 0x02 (x bar)
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0x7D, 0x09, 0x11, 0x21, 0x7D, // 0x03 (N bar)
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0x7D, 0x09, 0x05, 0x05, 0x79, // 0x04 (n bar)
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0x38, 0x44, 0x44, 0x38, 0x44, // 0x05 (alpha)
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0x7E, 0x01, 0x29, 0x2E, 0x10, // 0x06 (beta)
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0x30, 0x4A, 0x4D, 0x49, 0x30, // 0x07 (delta)
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0x60, 0x50, 0x48, 0x50, 0x60, // 0x08 (Delta)
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0x1E, 0x04, 0x04, 0x38, 0x40, // 0x09 (eta)
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0x3E, 0x49, 0x49, 0x49, 0x3E, // 0x0A (theta)
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0x62, 0x14, 0x08, 0x10, 0x60, // 0x0B (lambda)
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0x40, 0x3C, 0x20, 0x20, 0x1C, // 0x0C (mu)
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0x08, 0x7C, 0x04, 0x7C, 0x02, // 0x0D (pi)
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0x38, 0x44, 0x44, 0x3C, 0x04, // 0x0E (sigma)
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0x41, 0x63, 0x55, 0x49, 0x41, // 0x0F (Sigma)
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0x10, 0x08, 0x78, 0x08, 0x04, // 0x10 (tau)
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0x18, 0x24, 0x7E, 0x24, 0x18, // 0x11 (phi)
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0x5E, 0x61, 0x01, 0x61, 0x5E, // 0x12 (Omega)
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0x78, 0x14, 0x15, 0x14, 0x78, // 0x13 (ring A, Angstrom)
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0x38, 0x44, 0x45, 0x3C, 0x40, // 0x14 (ring a)
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0x78, 0x15, 0x14, 0x15, 0x78, // 0x15 (umlaut A)
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0x38, 0x45, 0x44, 0x3D, 0x40, // 0x16 (umlaut a)
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0x3C, 0x43, 0x42, 0x43, 0x3C, // 0x17 (umlaut O)
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0x38, 0x45, 0x44, 0x45, 0x38, // 0x18 (umlaut o)
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0x3C, 0x41, 0x40, 0x41, 0x3C, // 0x19 (umlaut U)
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0x38, 0x42, 0x40, 0x42, 0x38, // 0x1A (umlaut u)
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0x08, 0x08, 0x2A, 0x1C, 0x08, // 0x1B (right arrow)
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0x20, 0x7E, 0x02, 0x02, 0x02, // 0x1C (square root)
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0x12, 0x19, 0x15, 0x12, 0x00, // 0x1D (squared, superscript 2)
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0x48, 0x7E, 0x49, 0x41, 0x42, // 0x1E (pound sterling)
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0x01, 0x12, 0x7C, 0x12, 0x01, // 0x1F (yen)
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// Standard printable ASCII characters start at 32 (0x20)
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0x00, 0x00, 0x00, 0x00, 0x00, // 0x20 (space)
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0x00, 0x5F, 0x00, 0x00, 0x00, // 0x21 !
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0x00, 0x03, 0x00, 0x03, 0x00, // 0x22 "
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0x14, 0x7F, 0x14, 0x7F, 0x14, // 0x23 #
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0x24, 0x2A, 0x7F, 0x2A, 0x12, // 0x24 $
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0x23, 0x13, 0x08, 0x64, 0x62, // 0x25 %
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0x36, 0x49, 0x56, 0x20, 0x50, // 0x26 &
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0x00, 0x0B, 0x07, 0x00, 0x00, // 0x27 '
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0x00, 0x00, 0x3E, 0x41, 0x00, // 0x28 (
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0x00, 0x41, 0x3E, 0x00, 0x00, // 0x29 )
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0x08, 0x2A, 0x1C, 0x2A, 0x08, // 0x2A *
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0x08, 0x08, 0x3E, 0x08, 0x08, // 0x2B +
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0x00, 0x58, 0x38, 0x00, 0x00, // 0x2C ,
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0x08, 0x08, 0x08, 0x08, 0x08, // 0x2D -
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0x00, 0x30, 0x30, 0x00, 0x00, // 0x2E .
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0x20, 0x10, 0x08, 0x04, 0x02, // 0x2F /
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0x3E, 0x51, 0x49, 0x45, 0x3E, // 0x30 0
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0x00, 0x42, 0x7F, 0x40, 0x00, // 0x31 1
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0x62, 0x51, 0x49, 0x49, 0x46, // 0x32 2
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0x22, 0x41, 0x49, 0x49, 0x36, // 0x33 3
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0x18, 0x14, 0x12, 0x7F, 0x10, // 0x34 4
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0x27, 0x45, 0x45, 0x45, 0x39, // 0x35 5
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0x3C, 0x4A, 0x49, 0x49, 0x30, // 0x36 6
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0x01, 0x71, 0x09, 0x05, 0x03, // 0x37 7
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0x36, 0x49, 0x49, 0x49, 0x36, // 0x38 8
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0x06, 0x49, 0x49, 0x29, 0x1E, // 0x39 9
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0x00, 0x36, 0x36, 0x00, 0x00, // 0x3A :
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0x00, 0x56, 0x36, 0x00, 0x00, // 0x3B ; (changed from 0x00, 0x56, 0x3B, 0x00, 0x00)
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0x00, 0x08, 0x14, 0x22, 0x41, // 0x3C <
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0x14, 0x14, 0x14, 0x14, 0x14, // 0x3D =
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0x41, 0x22, 0x14, 0x08, 0x00, // 0x3E >
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0x02, 0x01, 0x51, 0x09, 0x06, // 0x3F ?
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0x3E, 0x41, 0x5D, 0x55, 0x1E, // 0x40 @
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0x7E, 0x09, 0x09, 0x09, 0x7E, // 0x41 A
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0x7F, 0x49, 0x49, 0x49, 0x36, // 0x42 B
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0x3E, 0x41, 0x41, 0x41, 0x22, // 0x43 C
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0x41, 0x7f, 0x41, 0x41, 0x3E, // 0x44 D (changed from 0x7F, 0x41, 0x41, 0x41, 0x3E)
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0x7F, 0x49, 0x49, 0x49, 0x41, // 0x45 E
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0x7F, 0x09, 0x09, 0x09, 0x01, // 0x46 F
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0x3E, 0x41, 0x41, 0x51, 0x32, // 0x47 G
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0x7F, 0x08, 0x08, 0x08, 0x7F, // 0x48 H
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0x00, 0x41, 0x7F, 0x41, 0x00, // 0x49 I
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0x20, 0x40, 0x40, 0x40, 0x3F, // 0x4A J
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0x7F, 0x08, 0x14, 0x22, 0x41, // 0x4B K
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0x7F, 0x40, 0x40, 0x40, 0x40, // 0x4C L
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0x7F, 0x02, 0x0C, 0x02, 0x7F, // 0x4D M
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0x7F, 0x04, 0x08, 0x10, 0x7F, // 0x4E N
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0x3E, 0x41, 0x41, 0x41, 0x3E, // 0x4F O
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0x7F, 0x09, 0x09, 0x09, 0x06, // 0x50 P
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0x3E, 0x41, 0x51, 0x21, 0x5E, // 0x51 Q
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0x7F, 0x09, 0x19, 0x29, 0x46, // 0x52 R
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0x26, 0x49, 0x49, 0x49, 0x32, // 0x53 S
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0x01, 0x01, 0x7F, 0x01, 0x01, // 0x54 T
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0x3F, 0x40, 0x40, 0x40, 0x3F, // 0x55 U
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0x07, 0x18, 0x60, 0x18, 0x07, // 0x56 V
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0x7F, 0x20, 0x18, 0x20, 0x7F, // 0x57 W
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0x63, 0x14, 0x08, 0x14, 0x63, // 0x58 X
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0x03, 0x04, 0x78, 0x04, 0x03, // 0x59 Y
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0x61, 0x51, 0x49, 0x45, 0x43, // 0x5A Z
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0x00, 0x00, 0x7F, 0x41, 0x41, // 0x5B [
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0x02, 0x04, 0x08, 0x10, 0x20, // 0x5C (backslash - escape character)
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0x41, 0x41, 0x7F, 0x00, 0x00, // 0x5D ]
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0x04, 0x02, 0x01, 0x02, 0x04, // 0x5E ^ (changed from 0x04, 0x02, 0x7F, 0x02, 0x04)
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0x40, 0x40, 0x40, 0x40, 0x40, // 0x5F _ (underscore)
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0x00, 0x07, 0x0B, 0x00, 0x00, // 0x60 `
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0x38, 0x44, 0x44, 0x3C, 0x40, // 0x61 a
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0x7F, 0x48, 0x44, 0x44, 0x38, // 0x62 b
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0x38, 0x44, 0x44, 0x44, 0x44, // 0x63 c
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0x38, 0x44, 0x44, 0x48, 0x7F, // 0x64 d
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0x38, 0x54, 0x54, 0x54, 0x08, // 0x65 e
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0x08, 0x7E, 0x09, 0x02, 0x00, // 0x66 f
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0x08, 0x14, 0x54, 0x54, 0x3C, // 0x67 g
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0x7F, 0x08, 0x04, 0x04, 0x78, // 0x68 h
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0x00, 0x44, 0x7D, 0x40, 0x00, // 0x69 i
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0x20, 0x40, 0x44, 0x3D, 0x00, // 0x6A j
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0x00, 0x7F, 0x10, 0x28, 0x44, // 0x6B k
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0x00, 0x41, 0x7F, 0x40, 0x00, // 0x6C l
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0x78, 0x04, 0x18, 0x04, 0x78, // 0x6D m
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0x7C, 0x08, 0x04, 0x04, 0x78, // 0x6E n
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0x38, 0x44, 0x44, 0x44, 0x38, // 0x6F o
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0x7C, 0x14, 0x24, 0x24, 0x18, // 0x70 p
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0x18, 0x24, 0x14, 0x7C, 0x40, // 0x71 q
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0x00, 0x7C, 0x08, 0x04, 0x04, // 0x72 r
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0x48, 0x54, 0x54, 0x54, 0x20, // 0x73 s
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0x04, 0x3E, 0x44, 0x20, 0x00, // 0x74 t
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0x3C, 0x40, 0x40, 0x20, 0x7C, // 0x75 u
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0x1C, 0x20, 0x40, 0x20, 0x1C, // 0x76 v
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0x3C, 0x40, 0x30, 0x40, 0x3C, // 0x77 w
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0x44, 0x28, 0x10, 0x28, 0x44, // 0x78 x
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0x0C, 0x50, 0x50, 0x50, 0x3C, // 0x79 y (changed from 0x04, 0x48, 0x30, 0x08, 0x04)
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0x44, 0x64, 0x54, 0x4C, 0x44, // 0x7A z
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0x00, 0x08, 0x36, 0x41, 0x00, // 0x7B {
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0x00, 0x00, 0x7F, 0x00, 0x00, // 0x7C | (changed from 0x00, 0x00, 0x77, 0x00, 0x00)
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0x00, 0x41, 0x36, 0x08, 0x00, // 0x7D }
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0x04, 0x02, 0x04, 0x08, 0x04, // 0x7E ~ (changed from 0x08, 0x04, 0x08, 0x10, 0x08)
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 0x7F Solid block (replaces ASCII definition of DEL) (changed from 0x2A, 0x55, 0x2A, 0x55, 0x2A)
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// Additional user-defined characters can be added here, up to 0xFF (i.e., 8-bits for a max of 255 character definitions)
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// Be sure to update index 1 (line 32 above, second value in the "00" definition) with the updated highest supported character value when adding characters.
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// Extra characters
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0x2A, 0x55, 0x2A, 0x55, 0x2A, // 0x80 Every other pixel on/off
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0x08, 0x1C, 0x3E, 0x7F, 0x00, // 0x81 Left pointing triangle
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0x00, 0x7F, 0x3E, 0x1C, 0x08, // 0x82 Right pointing triangle
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0x08, 0x0C, 0x0E, 0x0C, 0x08, // 0x83 Up pointing triangle
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0x08, 0x18, 0x38, 0x18, 0x08, // 0x84 Down pointing triangle
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0x08, 0x1C, 0x2A, 0x08, 0x08, // 0x85 Left arrow
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0x08, 0x08, 0x2A, 0x1C, 0x08, // 0x86 Right arrow
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0x04, 0x02, 0x7F, 0x02, 0x04, // 0x87 Up arrow
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0x10, 0x20, 0x7F, 0x20, 0x10, // 0x88 Down arrow
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0x00, 0x00, 0x07, 0x00, 0x00, // 0x89 ' Apostrophe/straight single quote
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0x00, 0x07, 0x00, 0x07, 0x00, // 0x8A " Straight double quote
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0x00, 0x01, 0x02, 0x04, 0x00, // 0x8B ` Simple back-tick
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0x7F, 0x41, 0x41, 0x41, 0x7F, // 0x8C box
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0x00, 0x08, 0x1C, 0x08, 0x00, // 0x8D inner product/dot product
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0x00, 0x00, 0x08, 0x00, 0x00, // 0x8E inner product/dot product (single pixel)
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0x00, 0x14, 0x08, 0x14, 0x00, // 0x8F cross product
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0x00, 0x7F, 0x00, 0x7F, 0x00, // 0x90 || logigal or
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0x08, 0x14, 0x2A, 0x14, 0x22, // 0x91 << double angle bracket
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0x22, 0x14, 0x2A, 0x14, 0x08, // 0x92 >> double angle bracket
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0x30, 0x38, 0x34, 0x32, 0x31, // 0x93 <= less than or equal
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0x31, 0x32, 0x34, 0x38, 0x30, // 0x94 >= greater than or equal
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0x2A, 0x2A, 0x2A, 0x2A, 0x2A, // 0x95 triple bar, equivalence
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0x10, 0x00, 0x02, 0x00, 0x10, // 0x96 therefore
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0x04, 0x04, 0x04, 0x04, 0x1C, // 0x97 not
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0x00, 0x00, 0x02, 0x05, 0x02, // 0x98 degrees
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0x08, 0x08, 0x2A, 0x08, 0x08, // 0x99 division
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];
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}

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