说明：   A simple example of using the keypad library for mikroC PRO for PIC. It supports keypads with 1..4 rows and 1..4 columns. The code being returned by the Keypad_Key_Press() or Keypad_Key_Click() functions is in range from 1..16. In this example, the code returned by the keypad library functions is transformed into ASCII codes [0..9,A..F]. In addition, a small single-byte counter displays number of key presses in the second LCD row.