用PROTEUS仿真单片机串口通讯 -

标题: 用PROTEUS仿真单片机串口通讯 [打印本页]

作者: hansong。 时间: 2020-6-24 16:19
标题: 用PROTEUS仿真单片机串口通讯

设计要求：
实现与Proteus中的8051单片机进行串行通信。先回顾一下串行通信。在串行通信中有两个引脚分别称为TX和RX。TX引脚用于发送数据，而RX引脚用于接收数据。
8051微控制器具有这两个引脚，因此它支持串行通信，并且这些引脚位于AT89C52微控制器的10号和11号引脚上。
首先，将对此项目进行原理图设计（如下图），在端口1上连接8个LED，并通过串行端口发送字符来打开或关闭这些LED。设计完原理图之后，我们将为8051微控制器设计编程代码，并测试结果。

#include <reg52.h>

#define Baud_rate 0xFD // BAUD RATE 9600

void SerialInitialize(void);

void SendByteSerially(unsigned char);

void cct_init(void);

sbit Appliance1 = P1^0;

sbit Appliance2 = P1^1;

sbit Appliance3 = P1^2;

sbit Appliance4 = P1^3;

sbit Appliance5 = P1^4;

sbit Appliance6 = P1^5;

sbit Appliance7 = P1^6;

sbit Appliance8 = P1^7;

void main()

{

cct_init();

SerialInitialize();

EA = 1;

ES = 1;

while(1) {;}

}

void cct_init(void) //initialize cct

{

P0 = 0x00; //not used

P1 = 0x00; //Used for Appliances

P2 = 0x00; //not used

P3 = 0x03; //used for serial

}

void SerialInitialize(void) // INITIALIZE SERIAL PORT

{

TMOD = 0x20;// Timer 1 IN MODE 2 -AUTO RELOAD TO GENERATE BAUD RATE

SCON = 0x50;// SERIAL MODE 1, 8-DATA BIT 1-START BIT, 1-STOP BIT, REN

//ENABLED

TH1 = Baud_rate;// LOAD BAUDRATE TO TIMER REGISTER

TR1 = 1;// START TIMER

}

void SendByteSerially(unsigned char serialdata)

{

SBUF = serialdata; // LOAD DATA TO SERIAL BUFFER REGISTER

while(TI == 0);// WAIT UNTIL TRANSMISSION TO COMPLETE

TI = 0;// CLEAR TRANSMISSION INTERRUPT FLAG

}

void serial_ISR (void) interrupt 4

{

//receive character

char chr;

if(RI==1)

{

chr = SBUF;

RI = 0;

}

P0 = ~P0; //Show the data has been updated

switch(chr)

{

case '1': Appliance1 = 1; SendByteSerially('k'); break;

case '2': Appliance2 = 1; SendByteSerially('k'); break;

case '3': Appliance3 = 1; SendByteSerially('k');break;

case '4': Appliance4 = 1; SendByteSerially('k'); break;

case '5': Appliance5 = 1; SendByteSerially('k'); break;

case '6': Appliance6 = 1; SendByteSerially('k'); break;

case '7': Appliance7 = 1; SendByteSerially('k'); break;

case '8': Appliance8 = 1; SendByteSerially('k'); break;

case 'a': Appliance1 = 0; SendByteSerially('k'); break;

case 'b':Appliance2 = 0; SendByteSerially('k'); break;

case 'c': Appliance3 = 0; SendByteSerially('k'); break;

case 'd': Appliance4 = 0; SendByteSerially('k'); break;

case 'e': Appliance5 = 0; SendByteSerially('k'); break;

case 'f': Appliance6 = 0; SendByteSerially('k'); break;

case 'g': Appliance7 = 0; SendByteSerially('k'); break;

case 'h': Appliance8 = 0; SendByteSerially('k'); break;

default: ;break; //do nothing

}

RI = 0;

}

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