Essential knowledge of Lanqiao Cup MCU-----(10) DS1302 clock
DS1302：
Write protection:
ds1302 chip:
ds1302.h add code
void ds1302_write();
void ds1302_read();
ds1302.c
#include <reg52.h>
#include <intrins.h>
sbit SCK=P1^7;
sbit SDA=P2^3;
sbit RST = P1^3; // DS1302复位
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 )
{
//需增加
unsigned char num;
RST=0; _nop_();
SCK=0; _nop_();
RST=1; _nop_();
Write_Ds1302(address);
//需增加
num=(dat/10<<4)|(dat%10);
//替换为num
Write_Ds1302(num);
//Write_Ds1302(dat);
RST=0;
}
unsigned char Read_Ds1302_Byte ( unsigned char address )
{
//需增加
unsigned char dat_low,dat_high;
unsigned char i,temp=0x00;
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_();
//需增加
/*以下是进制转化*/
dat_high=temp/16;
dat_low=temp%16;
temp=dat_high*10+dat_low;
/*以上是进制转化*/
return (temp);
}
/***************以下都是需要自己写的*******************************/
unsigned int code shijian[]={
50,59,23,0,0,0,0};//ds1302赋值为23：59：50
unsigned int time[7];//用于存放1302读取来的值
//1302读
//不做注释，比赛强行记忆
void ds1302_read()
{
unsigned int i;
unsigned char add;
add=0x81;
Write_Ds1302_Byte(0x8e,0x00); //写保护关
for(i=0;i<7;i++)
{
time[i]=Read_Ds1302_Byte(add);
add=add+2;
}
Write_Ds1302_Byte(0x8e,0x80); //写保护开
}
//1302写
//不做注释，比赛强行记忆
void ds1302_write()
{
unsigned int i;
unsigned char add;
add=0x80;
Write_Ds1302_Byte(0x8e,0x00);
for(i=0;i<7;i++)
{
Write_Ds1302_Byte(add,shijian[i]);
add=add+2;
}
Write_Ds1302_Byte(0x8e,0x80);
}
Add to the main function
extern time[]; //Mark the definition of the variable or function in another file, prompt the compiler to look for its definition in other modules when it encounters this variable or function
extern time[];//标示变量或者函数的定义在别的文件中，提示编译器遇到此变量和函数时在其他模块中寻找其定义
Test Results:
Paste the entire code
ds1302.h
#ifndef __DS1302_H
#define __DS1302_H
void Write_Ds1302(unsigned char temp);
void Write_Ds1302_Byte( unsigned char address,unsigned char dat );
unsigned char Read_Ds1302_Byte( unsigned char address );
void ds1302_write();
void ds1302_read();
#endif
ds1302.c
#include <reg52.h>
#include <intrins.h>
sbit SCK=P1^7;
sbit SDA=P2^3;
sbit RST = P1^3; // DS1302复位
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 )
{
//需增加
unsigned char num;
RST=0; _nop_();
SCK=0; _nop_();
RST=1; _nop_();
Write_Ds1302(address);
//需增加
num=(dat/10<<4)|(dat%10);
//替换为num
Write_Ds1302(num);
//Write_Ds1302(dat);
RST=0;
}
unsigned char Read_Ds1302_Byte ( unsigned char address )
{
//需增加
unsigned char dat_low,dat_high;
unsigned char i,temp=0x00;
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_();
//需增加
/*以下是进制转化*/
dat_high=temp/16;
dat_low=temp%16;
temp=dat_high*10+dat_low;
/*以上是进制转化*/
return (temp);
}
/***************以下都是需要自己写的*******************************/
unsigned int code shijian[]={
50,59,23,0,0,0,0};//ds1302赋值为23：59：50
unsigned int time[7];//用于存放1302读取来的值
//1302读
//不做注释，比赛强行记忆
void ds1302_read()
{
unsigned int i;
unsigned char add;
add=0x81;
Write_Ds1302_Byte(0x8e,0x00);
for(i=0;i<7;i++)
{
time[i]=Read_Ds1302_Byte(add);
add=add+2;
}
Write_Ds1302_Byte(0x8e,0x80);
}
//1302写
//不做注释，比赛强行记忆
void ds1302_write()
{
unsigned int i;
unsigned char add;
add=0x80;
Write_Ds1302_Byte(0x8e,0x00);
for(i=0;i<7;i++)
{
Write_Ds1302_Byte(add,shijian[i]);
add=add+2;
}
Write_Ds1302_Byte(0x8e,0x80);
}
main.c
#include <stc15f2k60s2.h>
#include "ds1302.h"
#define uchar unsigned char
#define uint unsigned int
uchar tab[] = {
0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90, 0xff,0xbf};
uchar dspbuf[] = {
10,10,10,10,10,10,10,10};
extern time[];
void display();
void load();
void cls()
{
P2 = (P2 & 0x1f) | 0x80;
P0 = 0xff;
P2 = 0x1f;
P2 = (P2 & 0x1f) | 0xa0;
P0 = 0x00;
P2 = 0x1f;
}
void main()
{
cls();
AUXR = 0xc0;
TMOD = 0x00;
TL0 = 0xcd;
TH0 = 0xd4;
TR0 = 1;
ET0 = 1;
EA = 1;
ds1302_write();
while(1)
{
ds1302_read();
}
}
void time0() interrupt 1
{
display();
}
void load()
{
dspbuf[0] = time[2]/10;
dspbuf[1] = time[2]%10;
dspbuf[2] = 11;
dspbuf[3] = time[1]/10;
dspbuf[4] = time[1]%10;
dspbuf[5] = 11;
dspbuf[6] = time[0]/10;
dspbuf[7] = time[0]%10;
}
void display()
{
static unsigned char dspcom = 0;
load();
P2 = (P2 & 0x1f) | 0xe0;
P0 = 0xff;
P2 = 0x1f;
P2 = (P2 & 0x1f) | 0xc0;
P0 = 1 << dspcom;
P2 = 0x1f;
P2 = (P2 & 0x1f) | 0xe0;
P0 = tab[dspbuf[dspcom]];
P2 = 0x1f;
if(++dspcom == 8) dspcom = 0;
}