一个很不错的51单片机直流电机调速设计，仿真程序都有 -

#include <reg52.h>
/*********************************************
* 定时器初值
*********************************************/
#define T0HIGH 0xec
#define T0LOWW 0x8a
/*********************************************
*
*********************************************/
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
typedef bit BOOL;
/*********************************************
* 单片机管脚定义
*********************************************/
sbit KEY_ON_PIN = P3^4;
sbit KEY_INC_PIN = P3^5;
sbit KEY_DEC_PIN = P3^6;
sbit pwm1=P1^4;
sbit MOTO_LEFT = P2^4;
sbit MOTO_RIGHT = P2^5;
/*********************************************
* 按键定义
*********************************************/
#define KEY_NULL 0xff
#define KEY_LONG_PERIOD 25
#define KEY_CONTINUE_PERIOD 20
#define KEY_DOWN 0x80
#define KEY_CONTINUE 0x40
#define KEY_UP 0x20
#define KEY_STATE_INIT 0
#define KEY_STATE_WOBBLE 1
#define KEY_STATE_PRESS 2
#define KEY_STATE_LONG 3
#define KEY_STATE_CONTINUE 4
#define KEY_STATE_RELEASE 5
#define KEY_ON_VALUE 1
#define KEY_INC_VALUE 2
#define KEY_DEC_VALUE 3
#define KEY_ON (KEY_ON_VALUE | KEY_DOWN)
#define KEY_INC (KEY_INC_VALUE | KEY_DOWN)
#define KEY_INC_CON (KEY_INC_VALUE | KEY_CONTINUE)
#define KEY_DEC (KEY_DEC_VALUE | KEY_DOWN)
#define KEY_DEC_CON (KEY_DEC_VALUE | KEY_CONTINUE)
/*********************************************
* 常量定义
*********************************************/
#define true 1
#define false 0
#define MOTO_ON MOTO_LEFT = false;\
MOTO_RIGHT = true
#define MOTO_OFF MOTO_LEFT = true;\
MOTO_RIGHT = true
/*********************************************
* 全局变量定义
*********************************************/
code u8 DisCode[] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90, 0x88};
u8 PWMpercent = 0;
u8 DisNum[4] = {0xa0, 0xa0, 0x00};
u8 DisPosition = 0;
u8 SecCount = 0;
u8 u10msNum = 0;
BOOL b10msEvent = false;
BOOL b100msEvent = false;
BOOL b1secEvent = false;
BOOL MotoStart = false;
BOOL MotoRun = false;
void Key_Prosess(void);
void Dynamic_Display(void);
void Speed_Display(void);
/*********************************************
* 主函数
*********************************************/
main()
{
TMOD = 0x01;
TH0 = T0HIGH;
TL0 = T0LOWW;
TR0 = 1;
ET0 = 1;
EA = 1;
P1 = 0x13;
while(1)
{
if(true == b10msEvent) //10毫秒定时标志
{
b10msEvent = false;
Key_Prosess(); //按键扫描
Dynamic_Display(); //动态显示
if(true == MotoStart) //如果电机启动
{
if(true == MotoRun)
{
if(--u10msNum == 0) //如果电机转动时间到,停止电机
{
MotoRun = true;
MOTO_OFF;
}
}
if(true == b1secEvent) //PWM周期为1秒,1秒钟时间到,开始下一个周期
{
b1secEvent = false;
MotoRun = true;
MOTO_ON;
u10msNum = PWMpercent;
}
}
}
}
}
/*********************************************
* 清显示
*********************************************/
void Num_Clear(void)
{
u8 i;
for(i=0; i<3; i++)
{
DisNum[i] = 0xa0;
}
DisNum[4] = 0x00;
}
/*********************************************
* 读键值
*********************************************/
u8 Key_Scan(void)
{
if(KEY_ON_PIN == false)
return KEY_ON_VALUE;
if(KEY_INC_PIN == false)
return KEY_INC_VALUE;
if(KEY_DEC_PIN == false)
return KEY_DEC_VALUE;
return KEY_NULL;
}
/*********************************************
* 按键状态扫描
*********************************************/
u8 GetKey(void)
{
static u8 KeyState = KEY_STATE_INIT;
static u8 KeyTimeCount = 0;
static u8 LastKey = KEY_NULL; //保存按键释放时候的键值
u8 KeyTemp = KEY_NULL ;
KeyTemp = Key_Scan();
switch(KeyState)
{
case KEY_STATE_INIT: //初始状态
if(KEY_NULL != KeyTemp) //有键按下
{
KeyState = KEY_STATE_WOBBLE; //进入消抖
}
break;
case KEY_STATE_WOBBLE: //消抖
KeyState = KEY_STATE_PRESS;
break;
case KEY_STATE_PRESS:
if(KEY_NULL != KeyTemp)
{
LastKey = KeyTemp; //保存键值,以便在释放按键状态返回键值
KeyTemp |= KEY_DOWN; //按键按下
KeyState = KEY_STATE_LONG;
}
else
{
KeyState = KEY_STATE_INIT;
}
break;
case KEY_STATE_LONG:
if(KEY_NULL != KeyTemp)
{
if(++KeyTimeCount >= KEY_LONG_PERIOD)
{
KeyTimeCount = 0;
KeyState = KEY_STATE_CONTINUE;
}
}
else
{
KeyState = KEY_STATE_RELEASE;
}
break;
case KEY_STATE_CONTINUE:
if(KEY_NULL != (KeyTemp))
{
if(++KeyTimeCount >= KEY_CONTINUE_PERIOD)
{
KeyTimeCount = 0;
KeyTemp |= KEY_CONTINUE; //连击按键事件发生
}
}
else
{
KeyState = KEY_STATE_RELEASE;
}
break;
case KEY_STATE_RELEASE:
LastKey |= KEY_UP; //按键释放
KeyTemp = LastKey;
KeyState = KEY_STATE_INIT;
break;
default:
break;
}
return KeyTemp;
}
/*********************************************
* 按键功能处理
*********************************************/
void Key_Prosess(void)
{
u8 KeyData;
KeyData = GetKey();
switch(KeyData)
{
case KEY_ON: //开关电机
if(true == MotoStart)
{
MotoStart = false;
Num_Clear();
MOTO_OFF;
MotoRun = false;
PWMpercent= 0;
}
else
{
MotoStart = true;
MOTO_ON;
MotoStart = true;
MotoRun = true;
u10msNum = PWMpercent = 1;
}
break;
case KEY_INC: //单步增加
case KEY_INC_CON: //连续增加
if((PWMpercent < 100) && MotoStart) //PWM从1%~100%
PWMpercent++;
break;
case KEY_DEC: //单步减小
case KEY_DEC_CON: //连续减小
if((PWMpercent > 1) && MotoStart) //PWM从1%~100%
PWMpercent--;
break;
default:
break;
}
Speed_Display();
}
/*********************************************
* 速度转换成十进制数
*********************************************/
void Speed_Display(void)
{
u8 i;
DisNum[0] = PWMpercent / 100;
DisNum[1] = PWMpercent % 100 / 10;
DisNum[2] = PWMpercent % 10;
for(i=1; i<2; i++)
{
if(DisNum[i] != 0)
break;
DisNum[i] = 0x10;
}
}
/*********************************************
* 动态显示速度百分比
*********************************************/
void Dynamic_Display(void)
{
static u8 DisPinOn = 0x01;
DisPinOn <<= 1;
if(DisPinOn == 0x10)
{
DisPosition = 0;
DisPinOn = 0x01;
}
P0 = 0xff;
P1 = DisPinOn;
P0 = DisCode[DisNum[DisPosition++]];
}
/*********************************************
* 定时器0中断
*********************************************/
void timer0(void) interrupt 1
{
TH0 = T0HIGH;
TL0 = T0LOWW;
b10msEvent = true; //10毫秒中断
if(++SecCount == 100)
{
SecCount = 0;
b1secEvent = true; //1秒到时
}
}

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