Pervasive Displays Library Suite¶

The Pervasive Displays library suite is specifically designed for the Pervasive Displays screens and boards.

It provides a high-level interface to drive the e-paper screens with global, fast and partial update, supports capacitive touch and haptic feed-back. It is developed in C++.

Supported screens¶

The suite supports

The EPD Extension Kit Gen 3 (EXT3 or EXT3-1) and Touch Expansion Board for EXT3 (EXT3-Touch) boards;
The iTC monochrome , monochrome with embedded fast update , monochrome with touch and colour (black-white-red) screens;
The EPD Pico Kit (EPDK) , which includes a Raspberry Pi Pico RP2040, an EXT3-1 extension board and a 2.66" monochrome panel; and
The EPD Pico Kit Touch (EPDK-271-Touch) , which includes a Raspberry Pi Pico RP2040, an EXT3-1 and EXT3-Touch extension boards and a 2.71"-Touch monochrome panel with embedded fast update and capacitive touch.

General architecture¶

The suite contains three layers:

The application libraries include graphics with clock, gauge and histogram; GUI with label, button, check-box or slider; codes with bar- and QR-codes; file to save and retrieve BMP files; and serial to generate and print header files on serial console;
The screen libraries support additional screen-specific features for the Pervasive Displays e-paper screens;
The shared libraries provide the common classes of the primitives for text and graphics; the interface for the peripherals GPIO, UART, SPI and I²C; and the fonts libraries.

The appendixes contain application notes, reference designs, a glossary, details on the used environment, an index, copyright, licence and disclaimer and other documents.

Documentation¶

The documentation consists on two documents:

This User guide focuses on how to use the different libraries, with commented examples;
The Reference manual lists all the objects and functions, with details for their parameters and returned results.

Additionally, the Wiki provides a gradual introduction to the e-paper technology and how to use it.