蓝桥杯之单片机学习（二十七）——电子钟（附题目和完整代码）

其他 2022-05-13 17:29:43 阅读次数: 0

文章目录

博主写题时，两个纰漏

  1. 时钟显示顺序错误
  2. 再对8位进行定义时，没包装成子函数，显的很啰嗦

一、题目展示

在这里插入图片描述

二、代码展示

2.1 main.c

#include <STC15F2K60S2.h>
#include "ds1302.h"
#include "onewire.h"

#define uchar unsigned char
#define uint unsigned int
	
uchar code SMG_duanma[19] = 
	{
    
    0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
	 0x88,0x80,0xc6,0xc0,0x86,0x8e,
	 0xbf,0x7f,0XFF};//分别是0-9（对应下标），A-F，“-”，“.”,“灭”

//分别是“0.-9.”
uchar code SMG_Dot_AC[10] = 
	 {
    
    0X40,0X79,0X24,0X30,0X19,0X12,0X02,0X78,0X00,0X10};
//对应数码管8位位码
uchar yi,er,san,si,wu,liu,qi,ba;
//秒、分、时、日、月、周、年
uchar shijian[] = {
    
    0X50,0X59,0X23,0X00,0X00,0X00,0X00};
//闹钟
uchar naozhong[] = {
    
    0X00,0X00,0X00,0X00,0X00,0X00,0X00};
//DS1302写和读地址
uchar Write_DS1302_adrr[7] = {
    
    0X80, 0X82, 0X84, 0X86, 0X88, 0X8A, 0X8C};
uchar Read_DS1302_adrr[7] = {
    
    0X81, 0X83, 0X85, 0X87, 0X89, 0X8B, 0X8D};
//时钟显示与设置(0为显示状态、1为设置状态)
uchar Mode_shizhong = 0;
//判断是亮还是灭（0是亮，1是灭）
uchar Mode_light = 0;
//闹钟设置
uchar Mode_naozhong = 0;
uchar tt = 0;
uchar t = 0;
uchar miao = 0;
//在加减时，判断S4还是S5\S7按下，一般置0
uchar Key_S4_S5_S7_Flag = 0;
//在闹钟加减时
uchar Key_S4_S5_S6_Flag = 0;
//判断L1是亮还是灭（0是亮，1是灭）
uchar Mode_L1_light = 0;
//闹钟提示标志位
uchar Check_naozhong = 0;


//系统初始化
void Initsys();
//配置HC138
void SelectHC138(uchar channel);
//在pos位码上，显示value段码
void DisplaySMG_Bit(uchar pos, uchar value);
//数码管8位码显示
void SMG_Display();
//数码管的延时
void Delay_one_ms_SMG();
//独立按键(BTN)
void Alone_Key();
//按键消抖延时
void Delay_five_ms_Key();
//读出时间
void Read_DS1302();
//时间初始化
void Init_DS1302();
//时钟设置函数
void Setting_shizhong();
//中断初始化
void Timer0Init(void);
//闹钟设置函数
void Setting_naozhong();

void main()
{
    
    
	yi = er = san = si = wu = liu = qi = ba = 18;
	Init_DS1302();
	Initsys();
	Timer0Init();
	while(1)
	{
    
    
		Read_DS1302();
		Alone_Key();
		yi = shijian[0] / 16;
		er = shijian[0] % 16;
		san = 16;
		si = shijian[1] / 16;
		wu = shijian[1] % 16;
		liu = 16;
		qi = shijian[2] / 16;
		ba = shijian[2] % 16;
		SMG_Display();
		if(Mode_shizhong == 1)
		{
    
    
			Setting_shizhong();
		}
		if(Mode_naozhong == 1)
		{
    
    
			Setting_naozhong();
		}
		if(naozhong[0] == shijian[0] && naozhong[1] == shijian[1] && naozhong[2] == shijian[2])
		{
    
    
			Check_naozhong = 1;
			miao = 0;
		}
		if(Check_naozhong == 0)
		{
    
    
			SelectHC138(4);P0 = 0XFF;
		}
		
	}
}

//闹钟设置函数
void Setting_naozhong()
{
    
    
	//1
	while(1)
	{
    
    
		Key_S4_S5_S6_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)yi = 18;
		else if(Mode_light == 1)yi = naozhong[0] / 16;;
		er = naozhong[0] % 16;
		san = 16;
		si = naozhong[1] / 16;
		wu = naozhong[1] % 16;
		liu = 16;
		qi = naozhong[2] / 16;
		ba = naozhong[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S6_Flag == 5 && yi != 9 && yi != 18){
    
    naozhong[0] = naozhong[0] + 16;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 4 && yi != 0 && yi != 18){
    
    naozhong[0] = naozhong[0] - 16;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 6)break;
	}
	//2
	while(1)
	{
    
    
		Key_S4_S5_S6_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)er = 18;
		else if(Mode_light == 1)er = naozhong[0] % 16;;
		yi = naozhong[0] / 16;
		san = 16;
		si = naozhong[1] / 16;
		wu = naozhong[1] % 16;
		liu = 16;
		qi = naozhong[2] / 16;
		ba = naozhong[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S6_Flag == 5 && er != 9 && er != 18){
    
    naozhong[0] = naozhong[0] + 1;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 4 && er != 0 && er != 18){
    
    naozhong[0] = naozhong[0] - 1;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 6)break;
	}
	//4
	while(1)
	{
    
    
		Key_S4_S5_S6_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)si = 18;
		else if(Mode_light == 1)si = naozhong[1] / 16;;
		yi = naozhong[0] / 16;
		er = naozhong[0] % 16;
		san = 16;
		wu = naozhong[1] % 16;
		liu = 16;
		qi = naozhong[2] / 16;
		ba = naozhong[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S6_Flag == 5 && si != 9 && si != 18){
    
    naozhong[1] = naozhong[1] + 16;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 4 && si != 0 && si != 18){
    
    naozhong[1] = naozhong[1] - 16;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 6)break;
	}
	//5
	while(1)
	{
    
    
		Key_S4_S5_S6_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)wu = 18;
		else if(Mode_light == 1)wu = naozhong[1] % 16;;
		yi = naozhong[0] / 16;
		er = naozhong[0] % 16;
		san = 16;
		si = naozhong[1] / 16;
		liu = 16;
		qi = naozhong[2] / 16;
		ba = naozhong[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S6_Flag == 5 && wu != 9 && wu != 18){
    
    naozhong[1] = naozhong[1] + 1;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 4 && wu != 0 && wu != 18){
    
    naozhong[1] = naozhong[1] - 1;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 6)break;
	}
	//7
	while(1)
	{
    
    
		Key_S4_S5_S6_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)qi = 18;
		else if(Mode_light == 1)qi = naozhong[2] / 16;;
		yi = naozhong[0] / 16;
		er = naozhong[0] % 16;
		san = 16;
		si = naozhong[1] / 16;
		wu = naozhong[1] % 16;
		liu = 16;
		ba = naozhong[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S6_Flag == 5 && qi != 9 && qi != 18){
    
    naozhong[2] = naozhong[2] + 16;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 4 && qi != 0 && qi != 18){
    
    naozhong[2] = naozhong[2] - 16;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 6)break;
	}
	//8
	while(1)
	{
    
    
		Key_S4_S5_S6_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)ba = 18;
		else if(Mode_light == 1)ba = naozhong[2] % 16;;
		yi = naozhong[0] / 16;
		er = naozhong[0] % 16;
		san = 16;
		si = naozhong[1] / 16;
		wu = naozhong[1] % 16;
		liu = 16;
		qi = naozhong[2] / 16;
		SMG_Display();
		if(Key_S4_S5_S6_Flag == 5 && ba != 9 && ba != 18){
    
    naozhong[2] = naozhong[2] + 1;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 4 && ba != 0 && ba != 18){
    
    naozhong[2] = naozhong[2] - 1;Key_S4_S5_S6_Flag = 0;}
		if(Key_S4_S5_S6_Flag == 6)break;
	}
	Key_S4_S5_S6_Flag = 0;
	Mode_naozhong = 0;
}

//时钟设置函数
void Setting_shizhong()
{
    
    
	//1
	while(1)
	{
    
    
		Key_S4_S5_S7_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)yi = 18;
		else if(Mode_light == 1)yi = shijian[0] / 16;;
		er = shijian[0] % 16;
		san = 16;
		si = shijian[1] / 16;
		wu = shijian[1] % 16;
		liu = 16;
		qi = shijian[2] / 16;
		ba = shijian[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S7_Flag == 5 && yi != 9 && yi != 18){
    
    shijian[0] = shijian[0] + 16;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 4 && yi != 0 && yi != 18){
    
    shijian[0] = shijian[0] - 16;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 7)break;
	}
	//2
	while(1)
	{
    
    
		Key_S4_S5_S7_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)er = 18;
		else if(Mode_light == 1)er = shijian[0] % 16;;
		yi = shijian[0] / 16;
		san = 16;
		si = shijian[1] / 16;
		wu = shijian[1] % 16;
		liu = 16;
		qi = shijian[2] / 16;
		ba = shijian[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S7_Flag == 5 && er != 9 && er != 18){
    
    shijian[0] = shijian[0] + 1;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 4 && er != 0 && er != 18){
    
    shijian[0] = shijian[0] - 1;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 7)break;
	}
	//4
	while(1)
	{
    
    
		Key_S4_S5_S7_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)si = 18;
		else if(Mode_light == 1)si = shijian[1] / 16;;
		yi = shijian[0] / 16;
		er = shijian[0] % 16;
		san = 16;
		wu = shijian[1] % 16;
		liu = 16;
		qi = shijian[2] / 16;
		ba = shijian[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S7_Flag == 5 && si != 9 && si != 18){
    
    shijian[1] = shijian[1] + 16;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 4 && si != 0 && si != 18){
    
    shijian[1] = shijian[1] - 16;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 7)break;
	}
	//5
	while(1)
	{
    
    
		Key_S4_S5_S7_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)wu = 18;
		else if(Mode_light == 1)wu = shijian[1] % 16;;
		yi = shijian[0] / 16;
		er = shijian[0] % 16;
		san = 16;
		si = shijian[1] / 16;
		liu = 16;
		qi = shijian[2] / 16;
		ba = shijian[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S7_Flag == 5 && wu != 9 && wu != 18){
    
    shijian[1] = shijian[1] + 1;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 4 && wu != 0 && wu != 18){
    
    shijian[1] = shijian[1] - 1;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 7)break;
	}
	//7
	while(1)
	{
    
    
		Key_S4_S5_S7_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)qi = 18;
		else if(Mode_light == 1)qi = shijian[2] / 16;;
		yi = shijian[0] / 16;
		er = shijian[0] % 16;
		san = 16;
		si = shijian[1] / 16;
		wu = shijian[1] % 16;
		liu = 16;
		ba = shijian[2] % 16;
		SMG_Display();
		if(Key_S4_S5_S7_Flag == 5 && qi != 9 && qi != 18){
    
    shijian[2] = shijian[2] + 16;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 4 && qi != 0 && qi != 18){
    
    shijian[2] = shijian[2] - 16;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 7)break;
	}
	//8
	while(1)
	{
    
    
		Key_S4_S5_S7_Flag = 0;
		Alone_Key();
		if(Mode_light == 0)ba = 18;
		else if(Mode_light == 1)ba = shijian[2] % 16;;
		yi = shijian[0] / 16;
		er = shijian[0] % 16;
		san = 16;
		si = shijian[1] / 16;
		wu = shijian[1] % 16;
		liu = 16;
		qi = shijian[2] / 16;
		SMG_Display();
		if(Key_S4_S5_S7_Flag == 5 && ba != 9 && ba != 18){
    
    shijian[2] = shijian[2] + 1;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 4 && ba != 0 && ba != 18){
    
    shijian[2] = shijian[2] - 1;Key_S4_S5_S7_Flag = 0;}
		if(Key_S4_S5_S7_Flag == 7)break;
	}
	//情况按键标志位
	Key_S4_S5_S7_Flag = 0;
	//初始化时钟
	Init_DS1302();
	//变成显示模式
	Mode_shizhong = 0;
}


//按键消抖延时
void Delay_five_ms_Key()
{
    
    
	uint i,j;
	for(i = 0; i < 5; i++)
		for(j = 845; j > 0; j--);
}

//独立按键(BTN)
void Alone_Key()
{
    
    
	//S7按键
	if(P30 == 0)
	{
    
    
		Delay_five_ms_Key();
		if(P30 == 0)
		{
    
    
			Check_naozhong = 0;
			if(Mode_shizhong == 0 && Mode_naozhong != 1)Mode_shizhong = 1;
			else if(Mode_shizhong == 1)
			{
    
    
				Key_S4_S5_S7_Flag = 7;
			}
		}
		while(!P30);
	}
	//S6按键
	else if(P31 == 0)
	{
    
    
		Delay_five_ms_Key();
		if(P31 == 0)
		{
    
    
			Check_naozhong = 0;
			if(Mode_shizhong != 1)
			{
    
    
			 	Mode_naozhong = 1;
				Key_S4_S5_S6_Flag = 6;
			}
		}
		while(!P31);
	}
	//S5按键
	else if(P32 == 0)
	{
    
    
		Delay_five_ms_Key();
		if(P32 == 0)
		{
    
    
			Key_S4_S5_S7_Flag = 5;
			Key_S4_S5_S6_Flag = 5;
			Check_naozhong = 0;
		}
		while(!P32);
	}
	//S4按键
	else if(P33 == 0)
	{
    
    
		Delay_five_ms_Key();
		if(P33 == 0)
		{
    
    
			Key_S4_S5_S7_Flag = 4;
			Key_S4_S5_S6_Flag = 4;
			Check_naozhong = 0;
		}
		if(Mode_shizhong == 0)
		{
    
    
			while(!P33)
			{
    
    
				uchar temp;
				temp = Temper();
				yi = 18; er = 18; san = 18; si = 18; wu = 18;
				liu = temp / 10;
				qi = temp % 10;
				ba = 12;
				SMG_Display();
			}
	  }
		else
		{
    
    
			while(!P33);
		}
	}
}

//配置HC138
void SelectHC138(uchar channel)
{
    
    
	switch(channel)
	{
    
    
		case 4:    //LED
			P2 = (P2 & 0X1F) | 0X80;
		break;
		case 5:    //蜂鸣器和继电器
			P2 = (P2 & 0X1F) | 0Xa0;
		break;
		case 6:    //位码
			P2 = (P2 & 0X1F) | 0Xc0;
		break;
		case 7:    //段码
			P2 = (P2 & 0X1F) | 0Xe0;
		break;
		case 0:    //锁住所有寄存器
			P2 = (P2 & 0X1F) | 0X00;
		break;
	}
}

//系统初始化
void Initsys()
{
    
    
	SelectHC138(5);
	P0 = 0X00;//关闭蜂鸣器和继电器
	SelectHC138(4);
	P0 = 0XFF;//关闭LED
	
	SelectHC138(6);
	P0 = 0XFF; //选择所有数码管
	SelectHC138(7);
	P0 = 0XFF; //关闭所有数码管
}

//在pos位码上，显示value段码
void DisplaySMG_Bit(uchar pos, uchar value)
{
    
    
	SelectHC138(6);
	P0 = 0X01 << pos;
	SelectHC138(7);
	P0 = value;
}

//数码管8位码显示
void SMG_Display()
{
    
    
	DisplaySMG_Bit(0, SMG_duanma[yi]);
	Delay_one_ms_SMG();
	DisplaySMG_Bit(1, SMG_duanma[er]);
	Delay_one_ms_SMG();
	DisplaySMG_Bit(2, SMG_duanma[san]);
	Delay_one_ms_SMG();
	DisplaySMG_Bit(3, SMG_duanma[si]);
	Delay_one_ms_SMG();
	
	DisplaySMG_Bit(4, SMG_duanma[wu]);
	Delay_one_ms_SMG();
	DisplaySMG_Bit(5, SMG_duanma[liu]);
	Delay_one_ms_SMG();
	DisplaySMG_Bit(6, SMG_duanma[qi]);
	Delay_one_ms_SMG();
	DisplaySMG_Bit(7, SMG_duanma[ba]);
	Delay_one_ms_SMG();
}

//数码管的延时
void Delay_one_ms_SMG()
{
    
    
	uint j;
	for(j = 845; j > 0; j--);
}

//时间初始化
void Init_DS1302()
{
    
    
	uchar i;
	Write_Ds1302(0X81, 0X00);
	for(i = 0; i < 7; i++)
	{
    
    
		Write_Ds1302(Write_DS1302_adrr[i], shijian[i]);
	}
}

//读出时间
void Read_DS1302()
{
    
    
	uchar i;
	for(i = 0; i < 7; i++)
	{
    
    
		shijian[i] = Read_Ds1302(Read_DS1302_adrr[i]);
	}
}

void Timer0Init(void)		//5毫秒@11.0592MHz
{
    
    
	AUXR |= 0x80;		//定时器时钟1T模式
	TMOD &= 0xF0;		//设置定时器模式
	TL0 = 0x00;		//设置定时初值
	TH0 = 0x28;		//设置定时初值
	TF0 = 0;		//清除TF0标志
	TR0 = 1;		//定时器0开始计时
	
	ET0 = 1;
	EA = 1;
}

void Timer0Server() interrupt 1
{
    
    
	tt++;
	t++;
	if(tt == 200)
	{
    
    
		if(Mode_light == 0)Mode_light = 1;
		else if(Mode_light == 1)Mode_light = 0;
		miao++;
		tt = 0;
	}
	if(miao == 5){
    
    Check_naozhong = 0;}
	if(Check_naozhong == 1 && t == 40)
	{
    
    
		SelectHC138(4);
		if(Mode_L1_light == 0){
    
    Mode_L1_light = 1;P0 = 0XFF;}
		else if(Mode_L1_light == 1){
    
    Mode_L1_light = 0;P0 = 0XFE;}
		t = 0;
	}
}

2.2 ds1302.c

/*
  程序说明: DS1302驱动程序
  软件环境: Keil uVision 4.10 
  硬件环境: CT107单片机综合实训平台 8051，12MHz
  日    期: 2011-8-9
*/

#include <reg52.h>
#include <intrins.h>

sbit SCK=P1^7;		
sbit SDA=P2^3;		
sbit RST = P1^3;   // DS1302复位												

void Write_Ds1302_Byte(unsigned  char temp) 
{
    
    
	unsigned char i;
	for (i=0;i<8;i++)     	
	{
    
     
		SCK=0;
		SDA=temp&0x01;
		temp>>=1; 
		SCK=1;
	}
}   

void Write_Ds1302( unsigned char address,unsigned char dat )     
{
    
    
 	RST=0;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
 	SCK=0;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
 	RST=1;	
   	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
 	Write_Ds1302_Byte(address);	
 	Write_Ds1302_Byte(dat);		
 	RST=0; 
}

unsigned char Read_Ds1302 ( unsigned char address )
{
    
    
 	unsigned char i,temp=0x00;
 	RST=0;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
 	SCK=0;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
 	RST=1;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
 	Write_Ds1302_Byte(address);
 	for (i=0;i<8;i++) 	
 	{
    
    		
		SCK=0;
		temp>>=1;	
 		if(SDA)
 		temp|=0x80;	
 		SCK=1;
	} 
 	RST=0;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
 	RST=0;
	SCK=0;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
	SCK=1;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
	SDA=0;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
	SDA=1;
	_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
	return (temp);			
}

2.3 onewire.c

/*
  程序说明: 单总线驱动程序
  软件环境: Keil uVision 4.10 
  硬件环境: CT107单片机综合实训平台(外部晶振12MHz) STC89C52RC单片机
  日    期: 2011-8-9
*/
#include "reg52.h"

sbit DQ = P1^4;  //单总线接口

//单总线延时函数
void Delay_OneWire(unsigned int t)  //STC89C52RC
{
    
    
	while(t--);
}

//通过单总线向DS18B20写一个字节
void Write_DS18B20(unsigned char dat)
{
    
    
	unsigned char i;
	for(i=0;i<8;i++)
	{
    
    
		DQ = 0;
		DQ = dat&0x01;
		Delay_OneWire(50);
		DQ = 1;
		dat >>= 1;
	}
	Delay_OneWire(50);
}

//从DS18B20读取一个字节
unsigned char Read_DS18B20(void)
{
    
    
	unsigned char i;
	unsigned char dat;
  
	for(i=0;i<8;i++)
	{
    
    
		DQ = 0;
		dat >>= 1;
		DQ = 1;
		if(DQ)
		{
    
    
			dat |= 0x80;
		}	    
		Delay_OneWire(50);
	}
	return dat;
}

//DS18B20设备初始化
bit init_ds18b20(void)
{
    
    
  	bit initflag = 0;
  	
  	DQ = 1;
  	Delay_OneWire(120);
  	DQ = 0;
  	Delay_OneWire(800);
  	DQ = 1;
  	Delay_OneWire(100); 
    initflag = DQ;     
  	Delay_OneWire(50);
  
  	return initflag;
}

unsigned char Temper()
{
    
    

	unsigned char di8,gao8,temp;
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	Delay_OneWire(200);
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	
	di8=Read_DS18B20();
	gao8=Read_DS18B20();
	
	temp=gao8<<4; 
	temp=temp|(di8>>4);
	return temp;

}

附

对于DS1302写入时间时，怎么可以输入61产生0X61的效果
因为这样修改DS1302的初始化时，就很好重置了

解决：

(dat/10<<4)|(dat%10)

dat如果是61，那么经过上式就变成0X61了

之后，我在写时，又决定改成16进制了，如果改变6的话，其实加上16就行了

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