4-2.c

8051单片机学习源码 包括定时器、键盘、液晶显示等

#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char 
#define ul unsigned long 

ul n; 
sbit dula=P2^6;
sbit wela=P2^7;
sbit c_led=P2^5;
sbit beep=P2^3;
uchar led=0xfe;
uchar count_0,count_1,s;

uchar code tabledu[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};

uchar code tabledu_0[]={
0xbf,0x86,0xdb,0xcf,
0xe6,0xed,0xfd,0x87,
0xff,0xef,0xf7,0xfc,
0xb9,0xde,0xf9,0xf1};

uchar code tablewe[]={
0x01,0x02,0x04,0x08,
0x10,0x20  
}; 

void display(uchar,uchar,uchar,uchar,uchar,uchar);
void led_beep();
void delay(uchar);


void main()
{EA=1;
ET1=1;
ET0=1;
TMOD=0X11;
TH1=(65536-10000)/256;
TL1=(65536-10000)%256;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
n=765432;
TR1=1;

while(1)
	{ 
	//------n decline and display the num;
	 if(count_1==1)
	  	{count_1=0;
		 n--;
		}
	 display(n/100000,n%100000/10000,n%10000/1000,n%1000/100,n%100/10,n%10);
	 
	 //------led shine
	 if(n<=764987&&TR0==0) TR0=1; // (&&TR0==0)can make this order run one time
	      
	 if(count_0==20)
			  {	 
			     s=1;
				 count_0=0;
				 led=_crol_(led,1);
		      }
	 if(s==1) {led_beep() ;s=0; }	// if count 0 interrupt one time ,then change the led;
		 
	} //while






}//main

void tim1() interrupt 3
	{
	TH1=(65536-10000)/256;
    TL1=(65536-10000)%256;
	count_1++;
	}

void tim0() interrupt 1
	{
	TH0=(65536-50000)/256;
    TL0=(65536-50000)%256;
	count_0++;
	}
void display(uchar w1,uchar w2,uchar w3,uchar w4,uchar w5,uchar w6)
    {
	P0=0x00;
	wela=1;
	wela=0;
	P0=~tabledu[w1];
	dula=1;
	dula=0;
	P0=tablewe[0];
	wela=1;
	wela=0;
	delay(1);
	//-------------------
	P0=0x00;
	wela=1;
	wela=0;
	P0=~tabledu[w2];
	dula=1;
	dula=0;
	P0=tablewe[1];
	wela=1;
	wela=0;
	delay(1);
	//-------------------
	P0=0x00;
	wela=1;
	wela=0;
	P0=~tabledu[w3];
	dula=1;
	dula=0;
	P0=tablewe[2];
	wela=1;
	wela=0;
	delay(1);
	//-------------------
	P0=0x00;
	wela=1;
	wela=0;
	P0=~tabledu_0[w4];	 // the fourth bit has the dot;
	dula=1;
	dula=0;
	P0=tablewe[3];
	wela=1;
	wela=0;
	delay(1);
	//-------------------
	P0=0x00;
	wela=1;
	wela=0;
	P0=~tabledu[w5];
	dula=1;
	dula=0;
	P0=tablewe[4];
	wela=1;
	wela=0;
	delay(1);
	//-------------------
	P0=0x00;
	wela=1;
	wela=0;
	P0=~tabledu[w6];
	dula=1;
	dula=0;
	P0=tablewe[5];
	wela=1;
	wela=0;	   
	delay(1);	
	}

	void led_beep()
	{uchar a,b;
	for(a=3;a>0;a--)
	   {beep=~beep;for(b=15;b>0;b--);}
    
	P1=led;
	c_led=1;
	c_led=0;
	
	}
	void delay(uchar x)
     {
	uchar a,b;
	for(a=x;a>0;a--)
		for(b=255;b>0;b--);	
    }