直流电机

#include"reg51.h"
#include"intrins.h"
#include"LCD1602.H"
/*****************宏定义********************/
#define uchar unsigned char
#define uint  unsigned int
sbit P20=P2^0;
sbit P21=P2^1;
uchar flag=0;  //高低电平标志
bit direction=0;  //方向标志
static uchar constant=5;  //可以改变占空比
/****************函数声明****************/
void delay(uchar i);
void reverse(void);	  //反转子函数
/****************定时器t0***************/
void time0(void) interrupt 1 using 1
{
static uchar i;
i++;
//频率为固定的1kHZ左右，只是占空比发生变化
if(i<=constant)
flag=1;
if(i<=10&&i>constant)	// constant=5,可以改变占空比
flag=2;	 //初始化为5:5
if(i==10)
i=0;
TH0=0xff;
TL0=0xe7;	//定时25us初值重装
}
/****************改变转向标志*****************/
void int1_srv (void) interrupt 2 using 2
{
if(INT1==0)	   //外部中断1中断
{
while(!INT1);  //等待外部中断1按键放开
direction=!direction;	 //电机方向取反
}
}
/****************中断，调节占空比*****************/
void change(void) interrupt 0 using 0
{
if(INT0==0)	  //外部中断0中断
{
while(!INT0); //等待外部中断0按键放开
constant++;	  //改变占空比
/********************************/
write_lcd_string(0,0,"mc= :  !        ");
write_lcd_string(0,1,"speed= !        ");
if(constant==10)
{
write_lcd_char(3,0,coder[0]);
write_lcd_char(5,0,coder[1]);
write_lcd_char(6,0,coder[0]);
}
else
{
_nop_();  //_nop_()相当于汇编的NOP]
}
if(constant!=10)
{
write_lcd_char(3,0,coder[constant]);
write_lcd_char(5,0,coder[10-constant]);
}
else
{
_nop_();  //_nop_()相当于汇编的NOP]
}
/********************************/
if(constant==1)write_lcd_char(6,1,coder[1]);
if(constant==2)write_lcd_char(6,1,coder[2]);
if(constant==3)write_lcd_char(6,1,coder[3]);
if(constant==4)write_lcd_char(6,1,coder[4]);
if(constant==5)write_lcd_char(6,1,coder[5]);
if(constant==6)write_lcd_char(6,1,coder[6]);
if(constant==7)write_lcd_char(6,1,coder[7]);
if(constant==8)write_lcd_char(6,1,coder[8]);
if(constant==9)write_lcd_char(6,1,coder[9]);
if(constant==10)write_lcd_char(6,1,coder[0]);
/********************************/
if(constant==10)
constant=0;
}
}
/****************延时子程序****************/
void delay(uchar i)
{
while(i--)
_nop_();   //_nop_()相当于汇编的NOP
}
/*****************主函数main***************/
void main()
{
EA=1;
TMOD=0x01;	//TO做定时，工作方式1
ET0=1;
TR0=1;
EX0=1;   //开外部中断0
IT0=1;	 //下降沿触发
EX1=1;   //开外部中断1
IT1=1;	 //下降沿触发
TH0=0xff;
TL0=0xe7;  //定时25us
/*************液晶初始化***************/
lcd_init();
write_lcd_string(0,0,"mc=5:5 !        ");
write_lcd_string(0,1,"speed=5!        ");
delay(10);
/***************死循环*****************/
while(1)
{
reverse();	//调用反转子函数
}
}

/***************************
//lcd1602.h
//data 2009
***************************/
unsigned char code coder[]="0123456789abcdef";
#define LCD_PORT P0
#define DISPLAYON 0x0c
#define DISPLAYOFF 0x08
#define INPUTMODE 0x06
#define DISPLAYCLR 0x01
#define RETURNHOME 0x02
sbit LCD_RS=P2^4;
sbit LCD_RW=P2^5;
sbit LCD_EN=P2^6;
void write_lcd_command(unsigned char);
void write_lcd_data(unsigned char);
void write_lcd_char(unsigned char x,bit y,unsigned char DATA);
//void write_lcd_string(unsigned char x,unsigned char y,unsigned char *p);
void lcd_init();
bit read_busy();
void gotoxy(unsigned char x,bit y);
/***************************************************************/
void lcd_init()
{
write_lcd_command (DISPLAYCLR);//清屏
while(read_busy());//读忙标志
write_lcd_command (0x38);//8位数据发送模式
while(read_busy());//读忙标志
write_lcd_command (DISPLAYON);//0x0C
while(read_busy());//读忙标志
write_lcd_command (INPUTMODE);//input mode
while(read_busy());//读忙标志
write_lcd_command (0x80);//设置LCD开始显示地址
while(read_busy());//读忙标志
write_lcd_command (DISPLAYCLR);//清屏
}
void write_lcd_command(unsigned char command)
{
LCD_PORT = command;
LCD_RS = 0;
LCD_RW = 0;
LCD_EN = 1;
LCD_EN = 0;
}
void write_lcd_data(unsigned char dat)
{
LCD_PORT = dat;
LCD_RS = 1;
LCD_RW = 0;
LCD_EN = 1;
LCD_EN = 0;
}
void write_lcd_char(unsigned char x,bit y,unsigned char DAT)
{
gotoxy( x, y);
while(read_busy());//读忙标志
write_lcd_data(DAT);
}
void write_lcd_string(unsigned char x,unsigned char y,unsigned char *p)
{
gotoxy( x, y);
while (*p)
{
while(read_busy());//读忙标志
write_lcd_data(*p);
p++;
}
}

bit read_busy()
{
unsigned char readdata;
LCD_PORT = 0xff;
LCD_RS = 0;
LCD_RW = 1;
LCD_EN = 1;
readdata = LCD_PORT;
LCD_EN = 0;
if (readdata >> 7)
return (1);
else
return (0);
}
void gotoxy(unsigned char x,bit y)
{
while(read_busy());//读忙标志
if(y)
write_lcd_command(0xc0 + x);//2 line
else
write_lcd_command(0x80 + x);//1 line
}
希望对大家有用，谢谢！