key.c.bak

PT2313程序音响控制电路1

#define uchar unsigned char
#define uint  unsigned int
#define ulong unsigned long
/////////////////////////////////
#include "at89x51.h"
/////////////////////////////////////
sbit   volinc=P3^0;
sbit   voldec=P3^0;
sbit   mute=P3^0;
bit    keyflap;
////////////////////////////////
uchar keyscan(uchar value)
{
uchar   i;	
	if(volinc==0)
	{
	delay1(250);
	if(volinc==0)	
	return(value=0);
       } 
	if(voldec==0)
	{
	delay1(250);
	if(voldec==0)	
	return(value=1);
}
	if(mute==0)
	{
        delay1(250);
        if(mute==0)
        while(mute==0)
	return(value=2);
}
              
}