51单片机实验 秒表设计.doc

实验报告一、实验名称10秒计时的秒表设计二、实验内容精确到0.1秒的秒表三、相关模块led数码管、usb、独立键盘四、实验代码#include reg52.h typedef unsigned int u16; /对数据类型进行声明定义typedef unsigned char u8;sbit LSA=P22;sbit LSB=P23;sbit LSC=P24;sbit k1=P31;sbit k2=P30;sbit k3=P32;sbit k4=P33;u8 code smgduan17=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71;u16 s,sec;unsigned int i;unsigned int j;unsigned int a,b,c,d;u8 mb2;void Timer0Init()TMOD|=0X01;/选择为定时器0模式，工作方式1，仅用TR0打开启动。TH0=0XFC;/给定时器赋初值，定时1msTL0=0X18;TR0=0;/打开定时器void delay(u16 n)while(n-);void DigDisplay1(u16 i)switch(i) case(0):LSA=0;LSB=0;LSC=0; break;case(1):LSA=1;LSB=0;LSC=0; break; case(2):LSA=0;LSB=1;LSC=0; break;case(3):LSA=1;LSB=1;LSC=0; break;case(4):LSA=0;LSB=0;LSC=1; break;case(5):LSA=1;LSB=0;LSC=1; break;case(6):LSA=0;LSB=1;LSC=1; break;case(7):LSA=1;LSB=1;LSC=1; break;if (i=1)P0=smgduanmbi+0x80;/发送段码elseP0=smgduanmbi; delay(1); /间隔一段时间扫描P0=0x00;/消隐void DigDisplay2(u16 i) i=i+3;switch(i) case(0):LSA=0;LSB=0;LSC=0; break;case(1):LSA=1;LSB=0;LSC=0; break; case(2):LSA=0;LSB=1;LSC=0; break;case(3):LSA=1;LSB=1;LSC=0; break;case(4):LSA=0;LSB=0;LSC=1; break;case(5):LSA=1;LSB=0;LSC=1; break;case(6):LSA=0;LSB=1;LSC=1; break;case(7):LSA=1;LSB=1;LSC=1; break;if (i=4)P0=smgduana+0x80;elseP0=smgduanb; delay(1); P0=0x00;void DigDisplay3(u16 i) i=i+6; switch(i) case(0):LSA=0;LSB=0;LSC=0; break;case(1):LSA=1;LSB=0;LSC=0; break; case(2):LSA=0;LSB=1;LSC=0; break;case(3):LSA=1;LSB=1;LSC=0; break;case(4):LSA=0;LSB=0;LSC=1; break;case(5):LSA=1;LSB=0;LSC=1; break;case(6):LSA=0;LSB=1;LSC=1; break;case(7):LSA=1;LSB=1;LSC=1; break;if (i=7)P0=smgduanc+0x80;elseP0=smgduand; delay(1); P0=0x00;void key1() delay(10); if(k1=0)TR0=!TR0;while(!k1); void key2() delay(10); if(k2=0) s=0; sec=0;while(!k2); void key3() delay(10); if(k3=0) if (j=0) j=1; else j=0; if (j=1) a=mb1; b=mb0; if (j=0)c=mb1;d=mb0;while(!k3);void key4() delay(10); if(k4=0) s=0; sec=0;a=0;b=0;c=0;d=0;while(!k2);void main()Timer0Init();i=0;j=0;while(1) delay(10); key1(); if(TF0=1)TF0=0;TH0=0XFC;/给定时器赋初值，定时1msTL0=0X18;s+;if(s=60) s=0;sec+;if(sec=100)sec=100; key2(); mb0=sec%10; mb1=(sec/10)%10; key3(); DigDisplay1(i); DigDisplay2(i); DigDisplay3(i); i+; i=i%2; key4();5、 实验效果K1作用：启动、开始或暂停计时K2作用：计数位清零K3作用：记录当前时间并显示K4作用：清零所有的数码管六、实验遇到的问题经过前几次的实验，0到10秒的计数已经不成问题，本次实验的难点主要在几个按键