设计要求
调用DS1302芯片驱动程序，读取DS1302中的实时时分秒数据，并显示在数码管上。
23时59分59秒
通过串口发送时间作为定时时间，定时时间到则蜂鸣器响2s后静音。
串口发送格式：“12：35：66”。
备注：
单片机IRC振荡器频率设置为12MHz。
键盘模式：BTN；扩展模式：IO模式
串口通信波特率：9600bps。
上电数码管显示时间：23时59分59秒，蜂鸣器静音。
代码
sys.h
#ifndef __SYS_H__
#define __SYS_H__#include <STC12C5A60S2.H>
extern unsigned char time[3];
extern unsigned char Seg_Buff[8];
//sys.c
void init74hc138();
void init();
void Seg_Loop();
void seg_time();
void buzz(bit flag);
//ds1302.c
void w_ds1302();
void r_ds1302();
#endifmain.c
#include "sys.h"
unsigned char str[8]={1,2,':',3,5,':',6,6};
bit flag_seg=0;
bit flag_time=0;
bit flag_buzz=0;
void Timer0_Init(void) //100微秒@12.000MHz
{AUXR |= 0x80; //定时器时钟1T模式TMOD &= 0xF0; //设置定时器模式TL0 = 0x50; //设置定时初始值TH0 = 0xFB; //设置定时初始值TF0 = 0; //清除TF0标志TR0 = 1; //定时器0开始计时ET0 = 1; //使能定时器0中断EA = 1;
}
void UartInit(void) //9600bps@12.000MHz
{SCON = 0x50; //8位数据,可变波特率AUXR |= 0x40; //定时器时钟1T模式AUXR &= 0xFE; //串口1选择定时器1为波特率发生器TMOD &= 0x0F; //设置定时器模式TL1 = 0xC7; //设置定时初始值TH1 = 0xFE; //设置定时初始值ET1 = 0; //禁止定时器中断TR1 = 1; //定时器1开始计时ES = 1;EA = 1;
}
void time_clock(){if(Seg_Buff[0]==str[0]&&Seg_Buff[1]==str[1]&&Seg_Buff[3]==str[3]&&Seg_Buff[4]==str[4]&&Seg_Buff[6]==str[6]&&Seg_Buff[7]==str[7]){buzz(1);flag_buzz=1;}
}
void main(){init();Timer0_Init();UartInit();w_ds1302();while(1){if(flag_seg){flag_seg=0;Seg_Loop();}if(flag_time){flag_time=0;r_ds1302();seg_time();time_clock();}}
}
void uart() interrupt 4
{static unsigned char i=0;if(RI){RI=0;str[i++]=SBUF-'0';if(i==8)i=0;}
}
void Timer0_Isr(void) interrupt 1
{static unsigned char count1=0;static unsigned int count2=0;static unsigned int count_buzz=0;count1++;count2++;if(count1==2){count1=0;flag_seg=1;}if(count2==5000){count2=0;flag_time=1;}if(flag_buzz){count_buzz++;if(count_buzz==20000){count_buzz=0;flag_buzz=0;buzz(0);}}
}sys.c
#include "sys.h"
code unsigned char Seg_Table[] =
{
0xc0, //0
0xf9, //1
0xa4, //2
0xb0, //3
0x99, //4
0x92, //5
0x82, //6
0xf8, //7
0x80, //8
0x90, //9
0xbf, //- 10
0xff //熄灭 11
};
unsigned char Seg_Buff[8]={11,11,11,11,11,11,11,11};
void init74hc138(unsigned char n){P2=(P2&0x1f)|(n<<5);P2&=0x1f;
}
void init(){P0=0x00;init74hc138(5);P0=0xff;init74hc138(4);
}
void seg(unsigned char addr,num){P0=0xff;init74hc138(7);P0=0x01<<addr;init74hc138(6);P0=Seg_Table[num];init74hc138(7);
}
void Seg_Loop(){static unsigned char i=0;seg(i,Seg_Buff[i]);i++;if(i==8)i=0;
}
void seg_time(){Seg_Buff[7]=time[0]%10;Seg_Buff[6]=time[0]/10;Seg_Buff[5]=10;Seg_Buff[4]=time[1]%10;Seg_Buff[3]=time[1]/10;Seg_Buff[2]=10;Seg_Buff[1]=time[2]%10;Seg_Buff[0]=time[2]/10;
}
void buzz(bit flag){if(flag)P0=0x40;elseP0=0x00;init74hc138(5);
}ds1302.c
#include "sys.h"
#include "intrins.h"
sbit SCK=P1^7;
sbit SDA=P2^3;
sbit RST=P1^3;
unsigned char time[3]={59,59,23};
void Write_Ds1302(unsigned char temp)
{unsigned char i;for (i=0;i<8;i++) { SCK = 0;SDA = temp&0x01;temp>>=1; SCK=1;}
}
void Write_Ds1302_Byte( unsigned char address,unsigned char dat )
{RST=0; _nop_();SCK=0; _nop_();RST=1; _nop_(); Write_Ds1302(address); Write_Ds1302(dat/10*16|dat%10); RST=0;
}
unsigned char Read_Ds1302_Byte ( unsigned char address )
{unsigned char i,temp=0x00;unsigned char dat1,dat2;RST=0; _nop_();SCK=0; _nop_();RST=1; _nop_();Write_Ds1302(address);for (i=0;i<8;i++) { SCK=0;temp>>=1; if(SDA)temp|=0x80; SCK=1;} RST=0; _nop_();SCK=0; _nop_();SCK=1; _nop_();SDA=0; _nop_();SDA=1; _nop_();dat1=temp/16;dat2=temp%16;temp=dat1*10+dat2;return (temp);
}
void w_ds1302(){unsigned char i,addr=0x80;Write_Ds1302_Byte(0x8e,0x00);for(i=0;i<3;i++){Write_Ds1302_Byte(addr,time[i]);addr+=2;}Write_Ds1302_Byte(0x8e,0x80);
}
void r_ds1302(){unsigned char i,addr=0x81;for(i=0;i<3;i++){time[i]=Read_Ds1302_Byte(addr);addr+=2;}
}