keyscan.c

ST7565_Driver_menu.rar

#include "AT89X52.H"
#include "SysFunction.h"


//按键音输出端
#define port_alarmout P2_0
//自动键延时计数
#define Autoclick  10



#define uchar unsigned char
sbit k_ok=P0^6;
sbit k_cancel=P0^7;
sbit k_up=P0^4;
sbit k_down=P0^5;

#define key_NoKey 0
#define key_ok 0x05
#define key_cancel 0x06
#define key_up 0x07
#define key_down 0x08

#define key_ok_L 0x85
#define key_cancel_L 0x86
#define key_up_L 0x87
#define key_down_L 0x88

unsigned char key_scan()
{
    
    uchar key,clc=Autoclick;
    key=key_NoKey;
	k_ok=1;
	k_cancel=1;
	k_up=1;
	k_down=1;

     if(k_ok==0)
    {
       key=key_ok;
    };

    if(k_cancel==0)
    {

        key=key_cancel; 
    };
    if(k_up==0)
    {
        key=key_up;
    };
    if(k_down==0)
    {
        key=key_down;
    };

      if (key!=key_NoKey)
      {
        port_alarmout=0;
        delayms(20);
        port_alarmout=1;
      }
    while(!(k_ok==1 && k_cancel==1 && k_up==1 && k_down==1) && clc!=0)
    {
    delayms(1); 
     // P1=0xf0;
	k_ok=1;
	k_cancel=1;
	k_up=1;
	k_down=1;
    clc--; 
    }
     if(clc==0)
     {
     return 0x80|key;
     }
    else
    {
    return key;
    }
} 

unsigned char key_scanW()
{ 
unsigned char keytmp;

do
{
keytmp=key_scan();
//WTD();
}
while(keytmp==key_NoKey);


return keytmp;


}
/*
//获得取消键
unsigned char key_Cancle()
{

}
*/