Nextion display support is now complete.   

A new graphics library and new demonstrations are available.    This new support includes serial bi-directional communications to the Nextion display, full font support, support for all the Nextion commands and all the stock Great Cow BASIC GLCD commands like Circle, Line, Box etc.

Nextion includes hardware part, a series of TFT boards, and software part (the Nextion editor (http://nextion.itead.cc/)).

The Nextion TFT board uses only one serial port to communicate.   It lets you avoid the hassle of wiring.  Nextion editor has mass components such as button, text, progress bar, slider, instrument panel etc. to enrich your interface design.   And, the drag-and-drop function ensures that you spend less time in programming

The Nextion displays are 2.4 to 7.0 inches and range from 320*240 to 800*480 pixels.   The connections are 5v, 0v, SerialIn and SerialOut.   Great Cow BASIC supports hardware and software serial connectivity.

Demonstrations are available on GitHub, a demonstration video is on YouTube and you can find the Help here
 

Enjoy.