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NuttX Graphics Subsystem (NX)

Overview

NX provides a tiny windowing system in the spirit of X, but greatly scaled down and appropriate for most resource-limited embedded environments.
The current NX implementation supports the general following, high-level features:

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  • Device Interface. NX supports any graphics device either of two device interfaces:
    1. Any device with random accesss video memory using the NuttX framebuffer driver interface (see include/nuttx/video/fb.h).

    2. Any LCD-like device than can accept raster line runs through a parallel or serial interface (see include/nuttx/lcd/lcd.h). By default, NX is configured to use the frame buffer driver unless CONFIG_NX_LCDDRIVER is defined =y in your NuttX configuration file.

      code


  • Transparent to NX Client. The window client on "sees" the sub-window that is operates in and does not need to be concerned with the virtual, vertical space (other that to respond to redraw requests from NX when needed).

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  • Keyboard input. NX also supports keyboard/keypad devices. APIs are provided to allow external devices to give keypad information to NX. NX will then provide the mouse input to the top window on the display (the window that has the focus) via a callback function.

See also