fasong.c

4×4矩阵键盘

#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
void delay(uchar ms);
sbit led=P1^2;
sbit duan=P1^3;
sbit wei=P1^4;
sbit BEEP=P2^3;
uchar num,flag,a,b,table1[10];
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0};
uchar key_scan();
uchar key_press();
void init();
void main()
{	
	uchar d;
	init();
	while(1)
		{	
	      if(key_press())
			{	
				if(key_scan()!=15)
					{
				table1[b]=key_scan();
				b++;
   			
				num=key_scan();
				duan=1;
				P0=table[num];
				duan=0;
					}
			}
				d=key_scan();
				if(d==15)
					{	
						d=0;
						ES=0;	
						SBUF=table1[0];	
						while(!TI);
						TI=0;
						SBUF=table1[1];	
						while(!TI);
						TI=0;
						SBUF=table1[2];	
						while(!TI);
						TI=0;
						SBUF=table1[3];
						TI=0;
					//	ES=1;
					}
				
		}

}

void delay(uchar ms)
{
	uint x,y;
	for(x=ms;x>0;x--)
		for(y=110;y>0;y--);
}
void init()
{
//***************主板硬件资源初始化
	b=0;
	num=16;
	P0=0xff;
	led=1;
	led=0;
	duan=1;
	P0=0;
	duan=0;
	wei=1;
	P0=0xf0;
	wei=0;     
//***************	
	
//***************  设置定时器0为工作方式1；定时器1为工作方式2；
	TMOD=0x21;					
	TH0=(65536-20000)/256;
	TL0=(65536-20000)%256;
	EA=1;
	ET0=1;
	TR0=1;   
    
//**************配置串口；
	SM0=0;
	SM1=1;
	TH1=0xfd;
	TL1=0xfd;
	ES=1;
	REN=1;
	TR1=1;
	
//*************
}

//**********键盘判断；返回值为1和0；
uchar key_press()    
{	
	uchar b;
	P3=0x0f;
	b=P3;
	b&=0x0f;
	if(b!=0x0f)
		{
			return 1;
		}
   	else
  		{
			return 0;
		}
}

//**********键盘扫描，返回值为key；
uchar key_scan()    
{
	uchar key,a;
	delay(5);
	if(key_press())
		{	
			P3=0xfe;
			a=P3;
			switch(a)
				{
					case 0xee:
					   key=0x00;
						break;
					case 0xbe:
						key=0x01;
						break;
					case 0xde:
						key=0x02;
						break;
					case 0x7e:
						key=0x03;
						break;
				}   
			P3=0xfd;
			a=P3;
			switch(a)
				{
					case 0xed:
					   key=4;
						break;
					case 0xbd:
						key=5;
						break;
					case 0xdd:
						key=6;
						break;
					case 0x7d:
						key=7;
						break;
				}  
			P3=0xfb;
			a=P3;
			switch(a)
				{
					case 0xeb:
					   key=8;
						break;
					case 0xbb:
						key=9;
						break;
					case 0xdb:
						key=10;
						break;
					case 0x7b:
						key=11;
						break;
				}	
			P3=0xf7;
			a=P3;
			switch(a)
				{
					case 0xe7:
					   key=12;
						break;
					case 0xb7:
						key=13;
						break;
					case 0xd7:
						key=14;
						break;
					case 0x77:
						key=15;
						break;
				}				
		
			while(key_press());           
	}
	return key;	
}

	

void timer0() interrupt 1
{	
	uchar i=0,j=0xfe;			
	TH0=(65536-20000)/256;
	TL0=(65536-20000)%256;
	
	
/*for(i;i<8;i++)
		{
			P0=table[i];
			duan=1;
			duan=0;
			P0=j;
			wei=1;
			wei=0;
			j=_crol_(j,1);
			delay(2);
			
		}	*/	
	
}

void scend() interrupt 4
{	
	if(RI==1)			
	RI=0;
	P0=SBUF;
	a=SBUF;
	led=1;
	led=0;
	flag=1;


}