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.
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First, the commands for drawing text and graphics update the frame-buffer.
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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 extension board hardware and simulated Viewer. The hV_Utilities_PDLS library shares common functions and variables for all the screens.
Warning
For a safe connection of the e-paper displays, please refer to EPD Handling and ESD Precaution .