Trait LcdText 

pub trait LcdText<const W: usize, const H: usize> {
    const ADDRESS: u8;
    const WIDTH: usize = W;
    const HEIGHT: usize = H;

    // Required method
    fn write_text(&self, text: impl AsRef<str>);
}

Platform-agnostic LCD text device contract.

Platform crates implement this trait for their generated LCD text types so shared logic can write text without knowing the hardware backend.

Design intent:

• This trait is intended for static dispatch on embedded targets.
• Dimensions are const generics so geometry remains compile-time.
• write_text accepts any string-like input via AsRef<str>.

Example: Write Text

This example writes text through a generic trait-bound helper.

use device_envoy_core::lcd_text::LcdText;

fn write_message<const W: usize, const H: usize>(lcd_text: &impl LcdText<W, H>) {
    lcd_text.write_text("Hello from\ndevice-envoy!");
}

Required Associated Constants

const ADDRESS: u8

LCD I2C address.

Provided Associated Constants

const WIDTH: usize = W

Display width in characters.

const HEIGHT: usize = H

Display height in characters.

Required Methods

fn write_text(&self, text: impl AsRef<str>)

Write text to the display. See the LcdText trait documentation for usage examples.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors