Oliver Broad / Mbed 2 deprecated LCD_nonblocking_demo

Demo of LCD modified to use interrupts not delays.

Dependencies:   mbed

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This is an experiment in controlling an LCD from callbacks independently of the main program loop. As it runs from callbacks it is necessary to check if the library is "busy", which is currently indicated by an integer called "busy".

Busy checking should be converted into a method so that the criteria for being "busy" can be changed without changing the API.

As this is rough I have not issued it as a library ... yet.

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