Description: 1 to achieve the key with the shift key scan.
(2) When more than one key pressed (not including the shift key), that the invalid keys.
3 When a single key press, after the delay to send the key to shaking the key code.
4, when the first press the shift key, and then have alternate functions of the keys is pressed, the debounce delay to send the key code multiplexing function keys
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KeyScan-WithShiftKey\main.c
....................\按键状态图.jpg
....................\说明.txt
KeyScan-WithShiftKey
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