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標題: 用PROTEUS仿真單片機串口通訊 [打印本頁]

作者: hansong。 時間: 2020-6-24 16:19
標題: 用PROTEUS仿真單片機串口通訊

設計要求：
實現與Proteus中的8051單片機進行串行通信。先回顧一下串行通信。在串行通信中有兩個引腳分別稱為TX和RX。TX引腳用于發送數據，而RX引腳用于接收數據。
8051微控制器具有這兩個引腳，因此它支持串行通信，并且這些引腳位于AT89C52微控制器的10號和11號引腳上。
首先，將對此項目進行原理圖設計（如下圖），在端口1上連接8個LED，并通過串行端口發送字符來打開或關閉這些LED。設計完原理圖之后，我們將為8051微控制器設計編程代碼，并測試結果。

#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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