eink-waveshare-rs

This library contains a driver for the 4.2 Inch E-Paper Module from Waveshare.

Support for more (especially the smaller and faster ones) should follow after the library around the 4.2" EInk is stable and tested enough.

(Supported) Devices

Device (with Link)	Colors	Flexible	Partial Refresh	Supported	Tested
4.2 Inch B/W (A)	Black, White	✕	Not officially [1]	✔	✔
1.54 Inch B/W (A)	Black, White	✕	✔
2.13 Inch B/W (A)	Black, White	✕	✔
2.9 Inch B/W (A)	Black, White	✕	✔	✔

4.2 Inch E-Ink Black/White

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

• [1]: 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 Wavedshare 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 seperation is most likely due to included fast partial refresh of the displays. In a Tabular form:

Type A	Tybe 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)

TODO's

• add more examples (e.g. for f3)
• improve the partial drawing/check the timings/timing improvements/....
• for later: add support for the smaller waveshare epds
• License: Stay with ISC (=MIT) or go to the Apache+MIT Dual License as used in many other projects?

Graphics/Drawing

Supports:

• Lines
• Squares
• Circles
• Pixels
• Chars
• Strings

Chars and Strings work with a 8x8-Font.

Support for bigger sized/independent Fonts is in work.

Examples

There is an example for Raspberry Pi in the example folder.