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Screen library

The screen library brings the specific routines required by the e-paper screens.

Compared to other screens, the e-paper screens relies on a frame-buffer.

  • First, the commands for drawing text and graphics update the frame-buffer.

  • Then, the command flush() sends the content of the frame-buffer to the screen and refreshes the panel.

The library deals with the logical screen, with x-y coordinates, which takes into account the orientation.

It is an abstraction of the physical screen with horizontal and vertical coordinates defined by the data-sheet.

The screen library exposes the screen object.

Two ancillary libraries share common functions. The hV_Board library includes the low-level functions for the EXT3-1 board hardware and simulated Viewer. The hV_Utilities_EPD library shares common functions and variables for all the screens.