//键盘全局声明externunsignedintKeyboard_Val;//当前键值//externunsignedcharKeyboard_Change_Flag;//键值改变标志，读入新键值后，标志位清零externu8key_pressed_flag;//有按键按下时置1externcharkeydata;#ifdefInterrupt_Scanexternu16Key_scan(void);externvoidKEY4x4_Init(void);externvoidInit_Keyboard_Interrupt(void);externu8Get_key(void);#endif