單片機(jī)時鐘秒表代碼

1、#include<reg52.h>#define uchar unsigned char#define uint unsigned intbit write=0; /寫24C02的標(biāo)志；sbit sda=P23; sbit scl=P22;sbit dula=P36;sbit wela=P37;sbit LED_CS=P25;sbit MOTOR_CS=P27;sbit key1=P10;sbit key2=P11;sbit key3=P12;sbit key4=P13;uint min,sec,tcnt,ge,shi,bai,qian;uchar a=0; uchar flag=

2、0;uchar code table=0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E;void delay() ; void delayms(uint z)uint x,y;for(x=z;x>0;x-)for(y=110;y>0;y-);void start() /開始信號:scl為高電平期間, sda發(fā)生負(fù)跳變sda=1;delay();scl=1;delay();sda=0;delay();void stop() /停止信號:scl為高電平, sda發(fā)生正跳變sda

3、=0;delay();scl=1;delay();sda=1;delay();void respons() /應(yīng)答信號:scl為高電平期間, sda被接受設(shè)備拉為低電平, 最后/scl置0uchar i;scl=1;delay();while(sda=1)&&(i<255) i+;scl=0;delay();void init() /總線初始化：將總線拉高以釋放總線sda=1;delay();scl=1;delay();/*寫字節(jié)數(shù)據(jù): 將8位數(shù)據(jù)通過左移到CY(進(jìn)位),然后賦值給數(shù)據(jù)線SDA每發(fā)送一位,scl出現(xiàn)正跳變 ，發(fā)送完數(shù)據(jù)后,需要將scl置0, sda置1*/

4、void write_byte(uchar date)uchar i,temp;temp=date;for(i=0;i<8;i+)temp=temp<<1;scl=0; delay();sda=CY;delay();scl=1;delay();scl=0;delay();sda=1;delay();/*讀字節(jié)數(shù)據(jù): 將數(shù)據(jù)一位一位從sda中獲取, 每讀取一位scl出現(xiàn)負(fù)跳變通過變量k將8位數(shù)據(jù)整合為1個字節(jié)數(shù)據(jù),讀數(shù)據(jù)前, 先將scl置0, sda置1*/uchar read_byte()uchar i,k;scl=0;delay();sda=1;delay();for(i=

5、0;i<8;i+)scl=1;delay();k=(k<<1)|sda;scl=0;delay();return k;/數(shù)碼管顯示程序void display(uchar qian,uchar bai,uchar shi,uchar ge) P0 = tablege; dula = 1; dula = 0; P0=0x08; wela = 1; wela = 0; delayms(1); P0 = tableshi; dula = 1; dula = 0; P0=0x04; wela = 1; wela = 0; delayms(1); P0 = tablebai; dula

6、 = 1; dula = 0; P0 = 0x02; wela= 1; wela= 0; delayms(1); P0 = tableqian; dula = 1; dula = 0; P0 = 0x01; wela= 1; wela= 0; delayms(1);/判斷按鍵void keyscan()MOTOR_CS=0; LED_CS=0; if(key1=0) delayms(10); /消抖 if(key1=0) sec=0;min=0; while(!key1); if(key2=0) delayms(10); if(key2=0) TR0=1; while(!key2); if(k

7、ey3=0) delayms(10);if(key3=0) TR0=0; while(!key3); if(key4=0) delayms(10); if(key4=0) TR0=0; sec=sec+1; while(!key4); void led() LED_CS=1;P0=0x00;delayms(250);P0=0xff;LED_CS=0; void beep()MOTOR_CS=1;P0 = 0x3f; delayms(250);P0 = 0x7f;MOTOR_CS=0;void main() LED_CS = 0;MOTOR_CS=0;sec=read_add(2); /讀出保存

8、的數(shù)據(jù)賦于secTMOD=0x01; /定時器工作在方式1ET0=1; /打開定時器、計數(shù)器0中斷允許位EA=1; /打開全局中斷/TR0=0;TH0=(65536-50000)/256; /對TH0 TL0賦值TL0=(65536-50000)%256; /使定時器0.05秒中斷一次 while(1) shi=sec/10; ge=sec%10;bai = min%10;qian = min/10;display(qian,bai,shi,ge);keyscan();if(write=1) /判斷計時器是否計時一秒 write=0; /置零write_add(2,sec); /在24c02的地址2中寫入數(shù)據(jù)sec void t0() interrupt 1 /定時中斷服務(wù)函數(shù)TH0=(65536-50000)/256; /對TH0 TL0賦值TL0=(65536-50000)%256; /重裝計數(shù)初值tcnt+; /每過50ms tcnt加一 if(tcnt=2