epdsi 0.1.3

no_std embedded-hal 1.0 compatible Rust driver framework for Electronic Paper Displays (EPD): SSD1680, SSD1681, SSD1677, UC8253, JD79661, ED2208, Pervasive Displays COG
Documentation 
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//! Panel specification for Pervasive Displays E2417QS0A3 (4.2" Spectra-4/BWRY e-Paper display).
//!
//! ### Hardware Notes:
//! - **Reference Driver**: `Pervasive_BWRY_Small` (`eScreen_EPD_417_QS_0A`, Driver A)
//! - **Native Resolution**: 400 x 300 pixels (no RAM over-scan: `30000` bytes at 2 bits-per-pixel
//!   `= 400*300*2/8`, exactly matching the visible pixel count).
//! - **Color Mode**: Spectra-4 (Black, White, Red, Yellow), 2 bits-per-pixel packed.
//! - **Busy Polarity**: Active-low (busy while LOW).
//!
//! ### Vendor References
//! - [Product page](https://www.pervasivedisplays.com/products/4-2-e-ink-displays/#spectra-4) —
//!   confirms resolution 400 × 300 pixels.
//! - [Datasheet flyer (PDF)](https://www.pervasivedisplays.com/wp-content/uploads/2025/10/Flyer_E2417QS0A3_20250407.pdf) —
//!   confirms resolution `400(V) x 300(H) pixel`, active area 84.8 × 63.6 mm.

use crate::traits::{ColorMode, EpdPanel};

/// Physical panel driver specification for Pervasive Displays E2417QS0A3 (BWRY Driver A).
#[allow(non_camel_case_types)]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct E2417QS0A3;

/// Pervasive reference alias for 4.2" QS Driver A display (`eScreen_EPD_417_QS_0A` / `417-QS-0A`).
#[allow(non_camel_case_types)]
pub type EPD_417_QS_0A = E2417QS0A3;

impl EpdPanel for E2417QS0A3 {
    /// Panel physical width in pixels.
    const WIDTH: u32 = 400;

    /// Panel physical height in pixels.
    const HEIGHT: u32 = 300;

    /// Display color operating mode (Spectra-4: Black, White, Red, Yellow).
    const COLOR_MODE: ColorMode = ColorMode::QuadColor;
}