L297, L298 drive stepper motor schematic diagram proteus simulation + program LCD display speed

Schematic diagram of L297, L298 driving stepper motor, tested and available

The 51 single-chip microcomputer program for L297 and L298 to drive the stepper motor is as follows:

#include "AT89X51.h"

int delay();

void inti_lcd();

void show_lcd(int);

void cmd_wr();

void ShowState();

void clock(unsigned int Delay) ;

void DoSpeed(); //Calculate speed

//Positive rotation value

#define RIGHT_RUN 1

//Reverse value

#define LEFT_RUN 0

sbit RS=0xA0;

sbit RW=0xA1;

sbit E=0xA2;

char SpeedChar[]="SPEED(n/min):";

char StateChar[]="RUN STATE:";

char STATE_CW[]="CW";

char STATE_CCW[]="CCW";

char SPEED[3]="050";

unsigned int RunSpeed=50; //speed

unsigned char RunState=RIGHT_RUN; //Running status

main()

{

        /*Timer settings*/

        TMOD=0x66; //Timer 0, 1 are both in counting mode; mode 2;

        EA=1; //Enable interrupt

        TH0=0xff; //Timer 0 initial value FFH;

        TL0=0xff;

        ET0=1;

        TR0=1;        

        TH1=0xff; //Timer 1 initial value FFH;

        TL1=0xff;

        ET1=1;

        TR1=1;

        IT0=1; //Pulse mode

        EX0=1; //Open external interrupt 0: speed up

        IT1=1; //Pulse mode

        EX1=1; //Open external interrupt 1: deceleration

    inti_lcd();

    DoSpeed();       

    ShowState();

    while(1)

    { 

      clock(RunSpeed);

      P0_1=P0_1^0x01;

    }

}

//Timer 0 interrupt program: forward

void t_0(void) interrupt 1

{

        RunState=RIGHT_RUN;        

    P0_0=1;

    P1=0x01;

    cmd_wr();

    ShowState();

} 

//Timer 1 interrupt: reverse

void t_1(void) interrupt 3

{

        RunState=LEFT_RUN;

    P0_0=0;

    P1=0x01;

    cmd_wr();

    ShowState();

} 

//Interrupt 0: speed up the program

void SpeedUp() interrupt 0

{   

       if(RunSpeed>=12)

          RunSpeed=RunSpeed-2; 

       DoSpeed();

       P1=0x01;

       cmd_wr();

       ShowState();

}

//Interrupt 1: deceleration program

void SpeedDowm() interrupt 2

{   

    if(RunSpeed<=100)

        RunSpeed=RunSpeed+2; 

    DoSpeed();

    P1=0x01;

    cmd_wr();

    ShowState();

}

int delay() //Judge whether LCD is busy

{   

    int a;

start:

    RS=0;

    RW=1;

    E=0;

    for(a=0;a<2;a++);

    E=1;

    P1=0xff;

    if(P1_7==0)

       return 0;

    else        

       goto start;

}

void inti_lcd() //Set LCD mode

{

   P1=0x38;

   cmd_wr();

   delay();

   P1=0x01; //Clear

   cmd_wr();

   delay();

   P1=0x0f;

   cmd_wr();

   delay();

   P1=0x06;

   cmd_wr();

   delay(); 

   P1=0x0c;

   cmd_wr();

   delay();

}

void cmd_wr() //write control word

{

   RS=0;

   RW=0;

   E=0;

   E=1;

}

void show_lcd(int i) //LCD display subroutine

{  

   P1=i;

   RS=1;

   RW=0;

   E=0;

   E=1;

}

void ShowState() //Display status and speed

{

    int i=0;

    while(SpeedChar[i]!='')

    {

       delay();

       show_lcd(SpeedChar[i]);

       i++;

    }

    delay();

    P1=0x80 | 0x0d;

    cmd_wr();

    i=0;

    while(SPEED[i]!='')

    {

       delay();

       show_lcd(SPEED[i]);

       i++;

    }

    delay();

    P1=0xC0;

    cmd_wr();

    i=0;

    while(StateChar[i]!='')

    {

       delay();

       show_lcd(StateChar[i]);

       i++;

    }

    delay();

    P1=0xC0 | 0x0A;

    cmd_wr();

    i=0;

    if(RunState==RIGHT_RUN)

        while(STATE_CW[i]!='')

        {

          delay();

          show_lcd(STATE_CW[i]);

          i++;

        }

    else

       while(STATE_CCW[i]!='')

        {

          delay();

          show_lcd(STATE_CCW[i]);

          i++;

        }

}

void clock(unsigned int Delay) //1ms delay program

{ unsigned int i; 

   for(;Delay>0;Delay--) 

    for(i=0;i<124;i++); 

}

void DoSpeed()

{

    SPEED[0]=(1000*6/RunSpeed/100)+48;

    SPEED[1]=1000*6/RunSpeed%100/10+48;

    SPEED[2]=1000*6/RunSpeed%10+48;

}