The key is, one of the SCM system most commonly used input device almost as long as the need for interactive input, you must have a keyboard. This blog for a generic keyboard program, as long as the function is to provide a read key (bottom key), the program will be completed debounced and stored in the queue and some columns processing. This procedure provides the most commonly used in the 4* 4 matrix keyboard program, and four key program.

Key\Getchar.c
...\Key.c
...\Key.ewd
...\Key.ewp
...\Key.h
...\Lcd12864.c
...\Lcd12864.h
...\main.c
...\Printf.c
...\Printf.h
Key

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