单片机源程序如下:

#include

#include

#include "stdio.h"

#include "delay.h"

#define uchar unsigned char

#define uint unsigned int

char smg_zx[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d, 0x7d,0x07,0x7f,0x6f,0x76,0X38};//

char smg_wx[]={0B00000001,0B00000010,0B00000100,0b00001000,0b00010000,0b00100000,0b01000000,0b10000000};

char buff[]={1,2,3,4,5,6,7,8};

uint cnt0=0,lc=0,dj=0,KS=11,ZJ=0;

uchar mode=0;

void delay_ms(unsigned int k) //8M MS级函数

{

unsigned int i,j;

for(i=0;i

{

for(j=0;j<570;j++);

}

}

////多位数拆分函数///////*/

void xs_buff()

{

buff[0]=lc/10;

buff[1]=lc%10;

buff[2]=dj/10;

buff[3]=dj%10;

buff[4]=ZJ/100;

buff[5]=ZJ/10%10;

buff[6]=ZJ%10;

buff[7]=KS;

}

void xs_smg()

{

static unsigned char posit=0;

PORTA |= 0XFF; // turn off

PORTA = ~ smg_wx[posit];//selecting led 7-segment

PORTB = smg_zx[buff[posit]]; //

delay_ms(2);

if(posit++>=7)posit=0;

}

void keyscan()

{

if((PIND&0xf0)!=0xf0)

{

delaynms(20);

if((PIND&0xf0)!=0xf0)

{

if((PIND&0x10)==0) //第一个按键

{

if(dj++>=10)dj=0;

KS=11; //L //++cnt_1; //00-FF

}

if((PIND&0x20)==0) //第二个按键

{

mode=0; //--cnt_1;//00-FF

SEI();

KS=10; //H

}

if((PIND&0x40)==0) //第三个按键

{

//--cnt_1;//00-FF

CLI();

KS=11; //L

}

if((PIND&0x80)==0) //第四个按键

{

if(mode++>=2)mode=0;//第一次按下时结束计价，第二次时清零，

KS=11; //L //--cnt_1;//00-FF

CLI();

if(mode==2)

{ZJ=0; lc=0;}

}

}

while((PIND&0xf0)!=0xf0);

}

}

void init_devices(void)//设备初始化函数

{

PORTA = 0XFF;//内部上拉

DDRA = 0xFF;//输出

PORTB = 0XFF;//内部上拉

DDRB = 0xFF;//输出

PORTD = BIT(4)|BIT(5)|BIT(6)|BIT(7);//内部上拉

PORTD &= (~BIT(3));

DDRD = ~(BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7));//输入

/****外部事件计数*******/

MCUCR = 0x02;

GICR = 0x80;

SREG = 0x80;

CLI(); //关中断

//SEI(); //开中断

}

void main(void)

{

init_devices();//设备初始化

delaynms(300); //延时待系统稳定；

while(1)

{

keyscan();

xs_buff();

xs_smg();

ZJ=lc*dj;

}

}

/****外部事件计数*******/

#pragma interrupt_handler int1_isr:3

void int1_isr()

{

if(++cnt0>500){cnt0=0;if(lc++>=99)lc=0;}

}