Single chip computer bicycle speed measurement system + source program + proteus simulation

The simulation schematic diagram of the bicycle speed measurement system is as follows

The microcontroller source program is as follows:

#include "d:c51reg51.h"

#include "d:c51intrins.h"

sbit LCM_RS=P3^0;

sbit LCM_RW=P3^1;

sbit LCM_EN=P3^7;

#define BUSY 0x80 //Constant definition

#define DATAPORT P1

#define uchar unsigned char

#define uint unsigned int

#define L 50

uchar str0[16],str1[16],count;

uint speed;

unsigned long time;

void ddelay(uint);

void lcd_wait(void);

void display();

void initLCM();

void WriteCommandLCM(uchar WCLCM,uchar BusyC);

void STR();

void account();

/*********Delay K*1ms,12.000mhz**********/

void int0_isr(void) interrupt 0 /*Remote control uses external interrupt 0, connected to P3.2 port*/

{

    unsigned int temp;

        time=count;

    TR0=0;

        temp=TH0;

        temp=((temp << 8) | TL0);

    TH0=0x3c;

    TL0=0xaf;

        count=0;

    TR0=1;

        time=time*50000+temp;

}

void time0_isr(void) interrupt 1 /*Remote control uses timer counter 1 */

{

   TH0 = 0x3c;

   TL0 = 0xaf;

   count++;

}

void main(void)

{

           TMOD=0x01; /*TMOD T0 selects mode 1 (16-bit timing) */

    IP|=0x01; /*INT0 interrupt priority*/

    TCON|=0x11; /*TCON EX0 falling edge trigger, start T0*/

    IE|=0x83;  

    TH0=0x3c;

    TL0=0xaf;

        initLCM();

           WriteCommandLCM(0x01,1); //Clear the display screen

        for(;;)

        {

                account();

                display();

        }

}

void account()

{

        unsigned long a; 

        if (time!=0)

        {

                a=L*360000000/time;

        }

        speed=a;

}

void STR()

{

        str0[0]='S';

        str0[1]='p';

        str0[2]='e';

    str0[3]='e';

        str0[4]='d';

        str0[5]=' ';        

        str0[6]=(speed%100000)/10000+0x30;

        str0[7]=(speed%10000)/1000+0x30;

        str0[8]=(speed%1000)/100+0x30;

        str0[9]='.';

        str0[10]=(speed%100)/10+0x30;

        str0[11]=speed%10+0x30;

        str0[12]='k';

        str0[13]='m';

        str0[14]='/';

        str0[15]='h';

}

void ddelay(uint k)

{

    uint i,j;

    for(i=0;i    {

        for(j=0;j<60;j++)

                {;}

    }

}

/**********Write instructions to LCD sub-function************/

void WriteCommandLCM(uchar WCLCM,uchar BusyC)

{

    if(BusyC)lcd_wait();

        DATAPORT=WCLCM;

    LCM_RS=0; /* Select instruction register */

    LCM_RW=0; // Write mode

    LCM_EN=1;

        _nop_();

        _nop_();

        _nop_();

    LCM_EN=0;

}

/**********Write data to LCD sub-function************/

void WriteDataLCM(uchar WDLCM)

{

    lcd_wait(); //Detect busy signal

        DATAPORT=WDLCM;

    LCM_RS=1; /* Select data register */

    LCM_RW=0; // Write mode

    LCM_EN=1;

    _nop_();

        _nop_();

        _nop_();

    LCM_EN=0;

}

/***********lcd internal waiting function*************/

void lcd_wait(void)

{

    DATAPORT=0xff; //If the MCU outputs a low level before reading the LCD, and the LCD reads a high level, there will be a conflict, and the Proteus simulation will display the logic yellow

        LCM_EN=1;

    LCM_RS=0;

    LCM_RW=1;

    _nop_();

    _nop_();

        _nop_();

    while(DATAPORT&BUSY)

        { LCM_EN=0;

           _nop_();

           _nop_();

           LCM_EN=1;

           _nop_();

           _nop_();

        }

           LCM_EN=0;

}

/**********LCD initialization subfunction***********/

void initLCM( )

{

        DATAPORT=0;

        ddelay(15);

        WriteCommandLCM(0x38,0); //Three times display mode setting, do not detect busy signal

    ddelay(5);

    WriteCommandLCM(0x38,0);

    ddelay(5);

    WriteCommandLCM(0x38,0);

    ddelay(5);

    WriteCommandLCM(0x38,1); //8bit data transmission, 2 lines display, 5*7 font, detect busy signal

    WriteCommandLCM(0x08,1); //Turn off the display and detect the busy signal

    WriteCommandLCM(0x01,1); //Clear the screen and detect busy signal

    WriteCommandLCM(0x06,1); //Display cursor right shift setting, detect busy signal

    WriteCommandLCM(0x0c,1); //Display screen is turned on, cursor is not displayed, not blinking, busy signal is detected

}

/****Display a character subfunction at the specified coordinate****/

void DisplayOneChar(uchar X,uchar Y,uchar DData)

{

    Y&=1;

    X&=15;

    if(Y)X|=0x40; //If y is 1 (display the second line), address code + 0X40

    X|=0x80; //Instruction code is address code + 0X80

    WriteCommandLCM(X,0);

    WriteDataLCM(DData);

}

/*******Display a string of characters at the specified coordinates subfunction*****/

void DisplayListChar(uchar X,uchar Y,uchar *DData)

{

    uchar ListLength=0;

    Y&=0x01;

    X&=0x0f;

    while(X<16)

    {

        DisplayOneChar(X,Y,DData[ListLength]);

        ListLength++;

        X++;

    }

}

void display()

{

        STR(); 

        DisplayListChar(0,0,str0);

           DisplayListChar(0,1,str1);

}