Description: 1. This program is very simple and it is not the key scan, but a direct reading of Pn mouth, easy to modify, without the impact of key positions, such as: number keys to change the location of the order can only change the keytable table, and it is easy to change into a double bond or more keys are pressed together. 2. there is a release method is to first read the line value, and then read column value row value* 4+ column values, such a release method is also simple but not very good modifiability and use multiplication, the code is relatively large. 3. can easily be adapted in a multi-key keyboard, such as 8* 8 keyboard, or more, not much more code, but can increase the keytable table
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51key.c
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