keyboard.c

来自「一款硬盘ＭＰ３的源代码」· C语言 代码 · 共 27 行

/* keyboard.c file 
   Created by Computer-lov. Date: 2005.3.19
   Last edited date: 2005.5.31
   Copyright (c) 2005 Computer-lov
   version 1.1
*/

#include "keyboard.h"
#include "AT89C51SND1C.H"

//////////////////////////////////////////////////
unsigned char key=0;


void ISR_keyboard(void) interrupt 11   //键盘中断处理
{
unsigned char key_press_status;
key_press_status=KBSTA;        //保存按键状态
if(key)return;                 //如果上一次按键未处理，等待处理完后，再响应新的按键
if(key_press_status & 0x01){key=KEY_UP;}   //散转
if(key_press_status & 0x02){key=KEY_FUN;}
if(key_press_status & 0x04){key=KEY_DOWN;}
if(key_press_status & 0x08){key=KEY_OK;}
}
//////////////////////////////////////////////////