单片机源程序如下:

#include "AT89X51.h"

int delay();

void inti_lcd();

void show_lcd(int);

void cmd_wr();

void ShowState();

void clock(unsigned int Delay) ;

void DoSpeed(); //计算速度

//正转值

#define RIGHT_RUN 1

//反转值

#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; //速度

unsigned char RunState=RIGHT_RUN; //运行状态

main()

{

/*定时器设置*/

TMOD=0x66; //定时器0，1都为计数方式；方式2；

EA=1; //开中断

TH0=0xff; //定时器0初值FFH；

TL0=0xff;

ET0=1;

TR0=1;

TH1=0xff; //定时器1初值FFH；

TL1=0xff;

ET1=1;

TR1=1;

IT0=1; //脉冲方式

EX0=1; //开外部中断0:加速

IT1=1; //脉冲方式

EX1=1; //开外部中断1:减速

inti_lcd();

DoSpeed();

ShowState();

while(1)

{

clock(RunSpeed);

P0_1=P0_1^0x01;

}

}

//定时器0中断程序:正转

void t_0(void) interrupt 1

{

RunState=RIGHT_RUN;

P0_0=1;

P1=0x01;

cmd_wr();

ShowState();

}

//定时器1中断:反转

void t_1(void) interrupt 3

{

RunState=LEFT_RUN;

P0_0=0;

P1=0x01;

cmd_wr();

ShowState();

}

//中断0:加速程序

void SpeedUp() interrupt 0

{

if(RunSpeed>=12)

RunSpeed=RunSpeed-2;

DoSpeed();

P1=0x01;

cmd_wr();

ShowState();

}

//中断1:减速程序

void SpeedDowm() interrupt 2

{

if(RunSpeed<=100)

RunSpeed=RunSpeed+2;

DoSpeed();

P1=0x01;

cmd_wr();

ShowState();

}

int delay() //判断LCD是否忙

{

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() //设置LCD方式

{

P1=0x38;

cmd_wr();

delay();

P1=0x01; //清除

cmd_wr();

delay();

P1=0x0f;

cmd_wr();

delay();

P1=0x06;

cmd_wr();

delay();

P1=0x0c;

cmd_wr();

delay();

}

void cmd_wr() //写控制字

{

RS=0;

RW=0;

E=0;

E=1;

}

void show_lcd(int i) //LCD显示子程序

{

P1=i;

RS=1;

RW=0;

E=0;

E=1;

}

void ShowState() //显示状态与速度

{

int i=0;

while(SpeedChar[i]!='