独立按键驱动程序
下面是独立按键驱动程序,特点是利用TIMER0中断,CPU在不停的扫描程序,60ms到,执行按键驱动,函数在48ms执行一次,60ms再次执行,避免了CPU资源的浪费
bit ltkey = 0; //防止按键被长按bit am_led = 0;uchar unitTemp = 0xff;bit amkey;bit remsg = 0;bit send = 0;bit delay100 = 0;bit mtoa = 0;void KeyScn(void) //按键扫描模块{uchar NowKeyValue;bit NowAMKeyValue;//检测按键if(pic == 10) //首次按键检测{amkey = AMKEY;unitTemp = P2;}if(pic == 13) //12ms后,再次执行检测{NowKeyValue = P2;NowAMKeyValue = AMKEY;if(NowKeyValue != unitTemp) //如果两次检测到的结果不同,则认为是抖动,不做处理{unitTemp = 0xff;}if((NowAMKeyValue == amkey) (amkey == 0)) //如果状态键按键有效{if(ltkey == 0){ //AM状态LED位,0为自动,1为手动am_led = !am_led;if(am_led == 0) //如果是从手动切回自动,切回到CH1{unitTemp = 0xf7;mtoa = 1; //由手动切到自动后的标志位}AMLED = am_led; //状态灯,变化时写入ltkey = 1;}}else{ltkey = 0;}}}
评论