#display #embedded-graphics #embedded-hal-driver #e-ink #epd #display-interface #epaper

no-std epd-waveshare

An embedded-hal based driver for ePaper displays from Waveshare formerly published as eink-waveshare-rs

7 releases (4 breaking)

0.6.0 Oct 28, 2024
0.5.0 Nov 28, 2021
0.4.0 Apr 6, 2020
0.3.2 Jun 17, 2019
0.2.0 Nov 6, 2018

#70 in Embedded development

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146 downloads per month
Used in 2 crates

ISC license

405KB
9K SLoC

Github CI Crates.io Docs.rs

EPD Driver

This library contains a driver for E-Paper Modules mostly from Waveshare (which are basically the same as the Dalian Good Display ones).

It uses the embedded graphics library for the optional graphics support.

A 2018-edition compatible version (Rust 1.31+) is needed.

Other similar libraries with support for much more displays are u8g2 and GxEPD for arduino.

Examples

There are multiple examples in the examples folder. Use cargo run --example example_name to try them.

// Setup the epd
let mut epd4in2 =
    Epd4in2::new(&mut spi, busy, dc, rst, &mut delay, None).expect("eink initalize error");

// Setup the graphics
let mut display = Display4in2::default();

// Build the style
let style = MonoTextStyleBuilder::new()
    .font(&embedded_graphics::mono_font::ascii::FONT_6X10)
    .text_color(Color::White)
    .background_color(Color::Black)
    .build();
let text_style = TextStyleBuilder::new().baseline(Baseline::Top).build();

// Draw some text at a certain point using the specified text style
let _ = Text::with_text_style("It's working-WoB!", Point::new(175, 250), style, text_style)
    .draw(&mut display);

// Going to sleep
epd4in2.sleep(&mut spi, &mut delay)

Check the complete example here.

(Supported) Devices

Device (with Link) Colors Flexible Display Partial Refresh Supported Tested
7.5 Inch B/W/R V2/V3 (B) Black, White, Red
7.5 Inch B/W HD (A) Black, White
7.5 Inch B/W V2 (A) [1] Black, White
7.5 Inch B/W (A) Black, White
7.3 Inch HAT (F) Black, White, Red, Green, Blue, Yellow, Orange
5.83 Inch B/W/R (b) Black, White, Red Not officially
5.65 Inch 7 Color (F) Black, White, Red, Green, Blue, Yellow, Orange
4.2 Inch B/W (A) Black, White Not officially [2]
2.13 Inch B/W (A) V2 Black, White
2.13 Inch B/W/R (B/C) V2 Black, White, Red
2.9 Inch B/W/R (B/C) Black, White, Red
2.9 Inch B/W (A) Black, White
2.9 Inch B/W V2 (A) Black, White
2.7 Inch 3 Color (B) Black, White, Red
2.66 Inch 3 Color (B) Black, White, Red
1.54 Inch B/W/Y (C) (Discontinued) Black, White, Yellow
1.54 Inch B/W/R (B) Black, White, Red
1.54 Inch B/W (A) Black, White

[1]: 7.5 Inch B/W V2 (A)

Since November 2019 Waveshare sells their updated version of these displays. They should have a "V2" marking sticker on the backside of the panel.

Use epd7in5_v2 instead of epd7in5, because the protocol changed.

[2]: 4.2 Inch E-Ink Black/White - Partial Refresh

Out of the Box the original driver from Waveshare only supports full updates.

That means: Be careful with the quick refresh updates:
It's possible with this driver but might lead to ghosting / burn-in effects therefore it's hidden behind a feature.

Interface

Interface Description
VCC 3.3V
GND GND
DIN SPI MOSI
CLK SPI SCK
CS SPI chip select (Low active)
DC Data/Command control pin (High for data, and low for command)
RST External reset pin (Low for reset)
BUSY Busy state output pin (Low for busy)

Display Configs

There are two types of Display Configurations used in Waveshare EPDs, which also needs to be set on the "new" E-Paper Driver HAT. They are also called A and B, but you shouldn't get confused and mix it with the Type A,B,C and D of the various Displays, which just describe different types (colored variants) or new versions. In the Display Config the separation is most likely due to included fast partial refresh of the displays. In a Tabular form:

Type A Type B
1.54in (A) 1.54in (B)
2.13in (A) 1.54in (C)
2.13in (D) 2.13in (B)
2.9in (A) 2.13in (C)
2.7in (A)
2.7in (B)
2.9in (B)
2.9in (C)
4.2in (A)
4.2in (B)
4.2in (C)
7.5in (A)
7.5in (B)
7.5in (C)

Dependencies

~175KB