MCU C language programming: MCU and PC communication

/* Name: MCU and PC communication

Description: The microcontroller can receive the PC

Send digital characters, press the microcontroller

After pressing K1, the microcontroller can send

String. Completed in Proteus environment

For this experiment, you need to install Virtual

Serial Port Driver and Serial Port Debug Assistant

This example buffers 100 numeric characters.

When the buffer is full, new numbers are stored from the front (ring buffer).

*/

#include

#define uchar unsigned char

#define uint unsigned int

uchar Receive_Buffer[101]; //Receive buffer

uchar Buf_Index=0;

//Digital tube encoding

// Buffer space index

uchar code DSY_CODE[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};

//Delay

void DelayMS(uint ms)

{

uchar i;

while(ms--) for(i=0;i<120;i++);

}

//Main program

void main()

{

uchar i;

P0=0x00;

Receive_Buffer[0]=-1;

SCON=0x50; Serial port mode 1, allowing reception

TMOD=0x20; //T1 working mode 2

TH1=0xfd; //Baud rate 9600

TL1=0xfd;

PCON=0x00; baud rate is not doubled

EA=1;EX0=1;IT0=1;

ES=1;IP=0x01;

TR1=1;

while(1)

{

for(i=0;i<100;i++)

{ //Receive -1 to end the display

if(Receive_Buffer[i]==-1) break;

P0=DSY_CODE[Receive_Buffer[i]];

DelayMS(200);

}

DelayMS(200);

}

  }[page]

//Serial port receive interrupt function

void Serial_INT() interrupt 4

{

uchar c;

if(RI==0) return; //Disable serial port interrupt

ES=0; // Clear the receive interrupt flag

RI=0;

c=SBUF;

if(c>=\'0\'&&c<=\'9\')

{ // Cache each newly received character and put -1 after it as the end mark

Receive_Buffer[Buf_Index]=c-\'0\';

Receive_Buffer[Buf_Index+1]=-1;

Buf_Index=(Buf_Index+1)%100;

}

ES=1;

}

void EX_INT0() interrupt 0 //External interrupt 0

{

uchar *s="This is the string sent by 8051!rn";

uchar i=0;

while(s[i]!=\'\')

{

SBUF=s[i];

while(TI==0);

TI=0;

i++;

}

}