10.03

来源：互联网发布：数据库事务特性编辑：程序博客网时间：2024/06/05 02:23

今天就写了两个程序，晚上准备去装一个linux以后方便学linux编程，收获呢就是对单片机的时序图模拟的顺利了点。。。
贴上代码，装机去。

#include "I2C.h"//延迟10usvoid Delay10us(void){    unsigned char a,b;    for(b=1;b>0;b--)        for(a=2;a>0;a--);}void I2cStart(){    SDA=1;    Delay10us();    SCL=1;    Delay10us();    SDA=0;    Delay10us();    SCL=0;    Delay10us();}void I2cEnd(){    SDA=0;     //这里第一次写出现错误    Delay10us();    SCL=1;    Delay10us();    SDA=1;    Delay10us();        }unsigned char I2cSendByte(unsigned char dat){//这里没有思路，不会写    unsigned char a=0, b=0;    for(a=0; a<8; a++)    {        SDA=dat>>7;        dat<<=1;        Delay10us();        SCL=1;        Delay10us();        SCL=0;        Delay10us();    }    SDA=1;    Delay10us();    SCL=1;    while(SDA)    {        b++;        if(b>200)        {            SCL=0;            Delay10us();            return 0;        }    }    SCL=0;    Delay10us();    return 1;}unsigned char I2cReadByte(){    unsigned char a=0, dat=0;    SDA=1;    Delay10us();    for(a=0; a<8; a++)    {        SCL=1;        Delay10us();        dat<<=1;        dat|=SDA;        Delay10us();        SCL=0;        Delay10us();    }    return dat;}void At24c02Write(unsigned char addr, unsigned char dat){    I2cStart();    I2cSendByte(0xa0);    I2cSendByte(addr);    I2cSendByte(dat);    I2cEnd();}unsigned char At24c02Read(unsigned char addr){    unsigned char num;    I2cStart();    I2cSendByte(0xa0);    I2cSendByte(addr);    I2cStart();    I2cSendByte(0xa1);    num=I2cReadByte();    I2cEnd();    return num;}

#ifndef _I2C_H#define _I2C_H#include "reg51.h"sbit SDA=P2^0;  //把这里写成P3^0口了，以为是通过串行口来模仿I2C总线时序，导致最后写完以后调试花了1个小时sbit SCL=P2^1;void I2cStart();void I2cEnd();unsigned char I2cSendByte(unsigned char);      unsigned char I2cReadByte();void At24c02Write(unsigned char, unsigned char);unsigned char At24c02Read(unsigned char); #endif

#include "reg51.h"#include "I2C.h"typedef unsigned char u8;typedef unsigned int u16;sbit K1=P3^1;sbit K2=P3^0;sbit K3=P3^2;sbit K4=P3^3;sbit LSA=P2^2;sbit LSB=P2^3;sbit LSC=P2^4;u8 code smg[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};char num=0;u8 Disp[4];void Delay(u16 i){    while(i--);}void KeyProc(){    if(K1==0)    {        Delay(1000);        if(K1==0)            At24c02Write(1, num);        while(!K1);    }    if(K2==0)    {        Delay(1000);        if(K2==0)            num=At24c02Read(1);        while(!K2);    }    if(K3==0)    {        Delay(100);        if(K3==0)        {            num++;            if(num>255)num=0;        }        while(!K3);    }    if(K4==0)    {        Delay(1000);        if(K4==0)            num=0;        while(!K4);    }}void DataProc(){    Disp[0]=smg[num/1000];    Disp[1]=smg[num%1000/100];    Disp[2]=smg[num%1000%100/10];    Disp[3]=smg[num%1000%100%10];   }void Display(){    u8 i;    for(i=0; i<4; 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;        }        P0=Disp[3-i];        Delay(100);        P0=0x00;    }}void main(){    while(1)    {        KeyProc();        DataProc();        Display();    }}

上面的程序主要是对I2C总线模拟。
下面是对18B20数据线的传输模拟

//mani.c#include "reg51.h"#include "temp.h"typedef unsigned char u8;typedef unsigned int u16;sbit LSA=P2^2;sbit LSB=P2^3;sbit LSC=P2^4;u8 code smg[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};char num=0;u8 Disp[4], DisplayData[8];void Delay(u16 i){    while(i--);}void DataProc(int temp){    float tp;    if(temp<0)    {        DisplayData[0]=0x40;        temp-=1;        temp=~temp;        tp=temp;        temp=tp*0.0625*100+0.5;    }    else    {        DisplayData[0]=0x00;        temp=temp*0.0625*100+0.5;    }    Disp[1]=smg[temp/10000];    Disp[2]=smg[temp%10000/1000];    Disp[3]=smg[temp%10000%1000/100]|0x80;    Disp[4]=smg[temp%100/10];       Disp[5]=smg[temp%100%10];}void Display(){    u8 i;    for(i=0; i<4; 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;        }        P0=Disp[5-i];        Delay(100);        P0=0x00;    }}void main(){       while(1)    {        DataProc(Ds18b20ReadTemp());        Display();    }}

//18b20.h#ifndef _TEMP_H#define _TEMP_H#include <reg51.h>#ifndef uchar#define uchar unsigned char#endif#ifndef uint#define uint unsigned int#endifsbit DSPORT=P3^7;int Ds18b20ReadTemp();#endif

//18b20.c#include "temp.h"void Delay1ms(uint y){    uint x;    for(; y>0; y--)    {        for(x=110; x>0; x--);    }}//1：成功； 0：失败uchar Ds18b20Init(){    uchar i=0;    DSPORT=0;    i=70;    while(i--);//642us    DSPORT=1;    i=0;    while(DSPORT)    {           Delay1ms(1);        i++;        if(i>5)        {            return 0;        }       }    return 1;}void Ds18b20WriteByte(uchar dat){    uchar i, j;    for(j=0; j<8; j++)    {        DSPORT=0;        i++;        DSPORT=dat&0x01;        i=6;        while(i--);//68us        DSPORT=1;        dat>>=1;    }}uchar Ds18b20ReadByte(){    uint i, j;    uchar bi, byte;    for(j=8; j>0; j--)    {        DSPORT=0;        i++;        DSPORT=1;        i++;        i++;        bi=DSPORT;        byte=(byte>>1)|(bi<<7);        i=4;        while(i--);    }    return byte;}void Ds18b20ChangeTemp(){    Ds18b20Init();    Delay1ms(1);    Ds18b20WriteByte(0xcc);    Ds18b20WriteByte(0x44);}void Ds18b20ReadTempCom(){    Ds18b20Init();    Delay1ms(1);    Ds18b20WriteByte(0xcc);    Ds18b20WriteByte(0xbe); }int Ds18b20ReadTemp(){    int temp=0;    uchar tmh, tml;    Ds18b20ChangeTemp();    Ds18b20ReadTempCom();    tml=Ds18b20ReadByte();    tmh=Ds18b20ReadByte();    temp=tmh;    temp<<=8;    temp|=tml;    return temp;}

可以实现对温度的实时监控。
装机去。

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