LED control of 51 single chip microcomputer and PC host computer serial communication

The PC controls the LED of the microcontroller on and off or controls the flashing and flashing time of the LED through the upper software. The username and password of the upper software are both admin. Note that PROTEUS serial port simulation needs to be combined with virtual serial port software to work.

Software description of host computer (including source code):
Send data analysis
Byte 1, 2: 0x55 0xaa Data is correct or not judgment flag
Byte 3:
           0x01 ------ Single LED control manual control
           0x02 ------ Single LED control automatic flashing

Byte 4                     
    This byte controls LED0-LED7 from low to high, for example, 0x01 means manually light up LED0 or LED0 flashes automatically; 0x28 means manually light up LED3, LED5 or LED3, LED5 flashes automatically

Byte 5, 6: Indicates flashing time (6 high 8 bits 5 low 8 bits) Value range 0-5000

Program source code preview:

#include

#define uint8 unsigned char

#define uint16 unsigned int

uint8 receive_buffer[6]; //Store received data

uint8 i,k;

void delay1ms(uint16 m) //1ms delay program

{

        uint8 j;

        while(m--)

                for(j=0;j<112;j++);

}

void main()

{

        uint16 time;

        P0 = 0xff; //Initialize LED status, turn off

        TMOD = 0x20; //Timer 1 works in mode 2

        TH1 = 0xfd;

        TL1 = 0xfd; //Baud rate 9600

        TR1 = 1; //Start timer 1

        EA = 1; // Enable general interrupt

        SM0 = 0;

        SM1 = 1; //Serial port working mode 1

        REN = 1; //Enable serial reception

        ES = 1; // Enable serial port interrupt

        while(1)

        {

                if((receive_buffer[0] == 0x55) && (receive_buffer[1] == 0xaa)) //If 0x55 0xaa is received, it means the received data is correct

                {

                        time = ((uint16)receive_buffer[5] << 8) + (uint16)receive_buffer[4]; // flashing time

                        switch(receive_buffer[2])

                        {

                                case 0x01: //manually control the LED on and off

                                        P0 = ~receive_buffer[3];

                                        break;

                                case 0x02: //LED flashes automatically

                                        P0 = ~receive_buffer[3];

                                        delay1ms(time);

                                        P0 = 0xff;

                                        delay1ms(time);

                                        break;

                                default:

                                        break;

                        }

                }

        }

}

void uart_int() interrupt 4

{

        if(RI == 1)

        {

                RI = 0;

                receive_buffer[i] = SBUF;

                i++;

                if(i == 6)

                {

                        i = 0;

                        k = 0;

                        P0 = 0xff;

                }

        }

}