访问电脑版页面

导航:老古开发网手机版51单片机51单片机串口

51单片机IO口模拟串口的实现

导读:
关键字:
模拟串口,IO口,51单片机,

IO口模拟串口 1602显示数据位内容程序可以实现一个51单片机有两个串口

51单片机IO口模拟串口的实现

#include

sbit BT_SND =P1^1;

sbit BT_REC =P1^0;

//1602部分引脚定义

sbit LCM_RW =P2^1 ;//定义引脚

sbit LCM_RS =P2^0;

sbit LCM_E =P2^2;

#define LCM_Data P0

#define Busy 0x80 //用于检测LCM状态字中的Busy标识

#define F_TM F0

#define TIMER0_ENABLE TL0=TH0; TR0=1;

#define TIMER0_DISABLE TR0=0;

void WritEDAtaLCM(unsigned char WDLCM);

void WriteCommandLCM(unsigned char WCLCM,BuysC);

unsigned char ReadDataLCM(void);

unsigned char ReadStatusLCM(void);

void LCMInit(void);

void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);

void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);

void Delay5Ms(void);

void Delay400Ms(void);

unsigned char code qq[] = {“Receive_Data”};

//unsigned char code tel[] = {“Command:”};

sbit ACC0=ACC^0;

sbit ACC1=ACC^1;

sbit ACC2=ACC^2;

sbit ACC3=ACC^3;

sbit ACC4=ACC^4;

sbit ACC5=ACC^5;

sbit ACC6=ACC^6;

sbit ACC7=ACC^7;

void IntTImer0() interrupt 1

{

F_TM=1;

}

//发送一个字符

void PSendChar(unsigned char inch)

{

ACC=inch;

F_TM=0;

BT_SND=0; //start bit

TIMER0_ENABLE; //启动

while(!F_TM);

BT_SND=ACC0; //先送出低位

F_TM=0;

while(!F_TM);

BT_SND=ACC1;

F_TM=0;

while(!F_TM);

BT_SND=ACC2;

F_TM=0;

while(!F_TM);

BT_SND=ACC3;

F_TM=0;

while(!F_TM);

BT_SND=ACC4;

F_TM=0;

while(!F_TM);

BT_SND=ACC5;

F_TM=0;

while(!F_TM);

BT_SND=ACC6;

F_TM=0;

while(!F_TM);

BT_SND=ACC7;

F_TM=0;

while(!F_TM);

BT_SND=1;

F_TM=0;

while(!F_TM);

TIMER0_DISABLE; //停止timer

}

//接收一个字符

unsigned char PGetChar()

{

TIMER0_ENABLE;

F_TM=0;

while(!F_TM); //等过起始位

ACC0=BT_REC;

TL0=TH0;

F_TM=0;

while(!F_TM);

ACC1=BT_REC;

F_TM=0;

while(!F_TM);

ACC2=BT_REC;

F_TM=0;

while(!F_TM);

ACC3=BT_REC;

F_TM=0;

while(!F_TM);

ACC4=BT_REC;

F_TM=0;

while(!F_TM);

ACC5=BT_REC;

F_TM=0;

while(!F_TM);

ACC6=BT_REC;

F_TM=0;

while(!F_TM);

ACC7=BT_REC;

F_TM=0;

while(!F_TM)

{

if(BT_REC)

{

break;

}

}

TIMER0_DISABLE; //停止timer

return ACC;

}

//检查是不是有起始位

bit StartBitOn()

{

return(BT_REC==0);

}

void main()

{

unsigned char gch,i;

TMOD=0x22; /*定时器1为工作模式2(8位自动重装),0为模式2(8位自动重装) */

PCON=00;

TR0=0; //在发送或接收才开始使用

TF0=0;

TH0=(256-96); //9600bps 就是 1000000/9600=104.167微秒 执行的timer是104.167*11.0592/12= 96

//

TL0=TH0;

ET0=1;

EA=1;

Delay400Ms(); //启动等待,等LCM讲入工作状态

LCMInit(); //LCM初始化

Delay5Ms(); //延时片刻(可不要)

DisplayListChar(2, 0, qq);

//DisplayListChar(0, 1, tel);

// ReadDataLCM();//测试用句无意义

PSendChar(0x55);

PSendChar(0xaa);

PSendChar(0x00);

PSendChar(0xff);

while(1)

{

if(StartBitOn())

{

gch=PGetChar();

PSendChar(gch);

for(i=0;i《8;i++)

DisplayOneChar(7-i,1, ((gch》》i)&0x01)+48);

}

}

}

//写数据

void WriteDataLCM(unsigned char WDLCM)

{

ReadStatusLCM(); //检测忙

LCM_Data = WDLCM;

LCM_RS = 1;

LCM_RW = 0;

LCM_E = 0; //若晶振速度太高可以在这后加小的延时

LCM_E = 0; //延时

LCM_E = 1;

}

//写指令

void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测

{

if (BuysC) ReadStatusLCM(); //根据需要检测忙

LCM_Data = WCLCM;

LCM_RS = 0;

LCM_RW = 0;

LCM_E = 0;

LCM_E = 0;

LCM_E = 1;

}

/*/读数据

unsigned char ReadDataLCM(void)

{

LCM_RS = 1;

LCM_RW = 1;

LCM_E = 0;

LCM_E = 0;

LCM_E = 1;

return(LCM_Data);

}

*/

//读状态

unsigned char ReadStatusLCM(void)

{

LCM_Data = 0xFF;

LCM_RS = 0;

LCM_RW = 1;

LCM_E = 0;

LCM_E = 0;

LCM_E = 1;

while (LCM_Data & Busy); //检测忙信号

return(LCM_Data);

}

void LCMInit(void) //LCM初始化

{

LCM_Data = 0;

WriteCommandLCM(0x38,0); //三次显示模式设置,不检测忙信号

Delay5Ms();

WriteCommandLCM(0x38,0);

Delay5Ms();

WriteCommandLCM(0x38,0);

Delay5Ms();

WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号

WriteCommandLCM(0x08,1); //关闭显示

WriteCommandLCM(0x01,1); //显示清屏

WriteCommandLCM(0x06,1); // 显示光标移动设置

WriteCommandLCM(0x0C,1); // 显示开及光标设置

}

//按指定位置显示一个字符

void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)

{

Y &= 0x1;

X &= 0xF; //限制X不能大于15,Y不能大于1

if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;

X |= 0x80; //算出指令码

WriteCommandLCM(X, 0); //这里不检测忙信号,发送地址码

WriteDataLCM(DData);

}

//按指定位置显示一串字符

void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)

{

unsigned char ListLength;

ListLength = 0;

Y &= 0x1;

X &= 0xF; //限制X不能大于15,Y不能大于1

while (DData[ListLength]》0x20) //若到达字串尾则退出

{

if (X 《= 0xF) //X坐标应小于0xF

{

DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符

ListLength++;

X++;

}

}

}

//5ms延时

void Delay5Ms(void)

{

unsigned int TempCyc = 5552;

while(TempCyc--);

}

//400ms延时

void Delay400Ms(void)

{

unsigned char TempCycA = 5;

unsigned int TempCycB;

while(TempCycA--)

{

TempCycB=7269;

while(TempCycB--);

};

}

来源:工程师周亮   作者:lhl545545  2019/5/10 15:22:00
栏目: [ 51单片机串口]

相关阅读

51单片机串口通讯编程的方式解析

在VB下PC机与MCS-51单片机的串行通信

如何计算8051单片机的波特率

AT89S51单片机串行口的内部结构及功能介绍

51单片机的串口通信协议

C51单片机串口的使用方法解析

51单片机IO口模拟串口的实现

51单片机IO口模拟串口通讯的设计

MCS-51单片机多机通信的工作原理解析

AT89S51单片机串行口的结构

51单片机三种模拟串口的设计方案解析

如何设置51单片机的串行口来实现与PC机通信

51单片机与PC机的串口通讯设计

AT89S51单片机串行口的内部结构解析

8051单片机实现高速串行通信的设计

51单片机实现串口接收和发送数据的两种方法解析

8051单片机的UART0串口初始化

C51单片机串口通讯的硬件电路图

AT89S51单片机串行口的内部结构及工作原理介绍

51单片机串口通信的原理与应用流程解析