51简易方波及PWM波发生器

时间：10-02 整理：3721RD 点击：

   51单片机最小系统
   按键调方波周期及占空比、PWM波周期
   1602LCD显示周期、占空比

系统初始化

方波周期、占空比设置

PWM波高电平最大宽度设置

源码
#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
//--------------------------1602液晶
sbit RS = P1^0; //定义端口
sbit RW = P1^1;
sbit EN = P2^5;
#define RS_CLR RS=0
#define RS_SET RS=1
#define RW_CLR RW=0
#define RW_SET RW=1
#define EN_CLR EN=0
#define EN_SET EN=1
#define DataPort P0
//--------------------------按键
sbit s3=P2^2;//加
sbit s4=P2^3;//减
sbit s5=P2^4;//功能切换键
//--------------------------存储波形参数
uchar o;
uchar p;
uchar q1,q2;
uchar r1,r2,r3;
//--------------------------波形选择
uchar wave;//选择波形
uchar wei;
bit keyscan_done;
uchar s5num=0;
sbit led1=P1^6;//功能按键指示灯
sbit led2=P1^7;//加减按键指示灯
//--------------------------方波
sbit fang=P1^4;//方波输出端口
uchar T=0;
uchar D=0;
//--------------------------PWM波
sbit pwm=P1^5;//PWM波输出端口nvvv
uint C=0;
uchar pwm_high=0,pwm_low=0;
//--------------------------//延时函数
void delayus(uint t)
{
while(--t);
}
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
   for(y=110;y>0;y--);
}
//--------------------------------1602液晶函数
void LCD_Write_Com(unsigned char com)//写指令函数
{
delay(5);
RS_CLR;
RW_CLR;
EN_SET;
DataPort= com;
_nop_();
EN_CLR;
}
void LCD_Write_Data(unsigned char Data)//写数据函数
{
delay(5);
RS_SET;
RW_CLR;
EN_SET;
DataPort= Data;
_nop_();
EN_CLR;
}
void LCD_Clear(void) //清屏函数
{
LCD_Write_Com(0x01);
delay(5);
}
  void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data)//写字符函数
{
if (y == 0)
{
LCD_Write_Com(0x80 + x);
}
else
{
LCD_Write_Com(0xC0 + x);
}
LCD_Write_Data( Data);
}
void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)//写字符串函数
{
if (y == 0)
{
   LCD_Write_Com(0x80 + x);    //表示第一行
}
else
{
LCD_Write_Com(0xC0 + x);    //表示第二行
}
while (*s)
{
LCD_Write_Data( *s);
s ++;
}
}
void LCD_Init(void)//初始化函数
{
LCD_Write_Com(0x38); /*显示模式设置*/
delay(5);
LCD_Write_Com(0x38);
delay(5);
LCD_Write_Com(0x38);
delay(5);
LCD_Write_Com(0x38);
LCD_Write_Com(0x08); /*显示关闭*/
LCD_Write_Com(0x01); /*显示清屏*/
LCD_Write_Com(0x06); /*显示光标移动设置*/
delay(5);
LCD_Write_Com(0x0C); /*显示开及光标设置*/
  }
//-------------------------------------------方波函数
void fangbo()
{
fang=1;
delay(T*D/100);
fang=0;
delay(T*(1-D/100));
}
//----------------------------------------PWM函数
void PWM()
{
pwm=1;//低电平逐渐升为高电平
   for(pwm_high=1;pwm_high<C;pwm_high++)
{
pwm=0;
   delayus(pwm_high);          //PWM函数
      pwm=1;
      delayus(C-pwm_high);
   }
    pwm=0;//高电平逐渐降为低电平
    for(pwm_low=C-1;pwm_low>0;pwm_low--)
   {
   pwm=0;
   delayus(pwm_low);
   pwm=1;
   delayus(C-pwm_low);
   }
pwm=1;
}
//-------------------------------------------按键函数
void keyscan1()
{
if(s5==0)//波形选择及参数设置按键
{
delay(10);
     if(s5==0)//确认按键被按下
{
      s5num+=1;//记录按键被按下的次数
led1=0;//切换键指示灯
      delay(30);
      while(！s5);//确认释放
led1=1;
switch(s5num)
{
case 1:LCD_Clear();LCD_Write_Com(0x80+0x40+2);LCD_Write_Com(0x0f);break;
case 2:LCD_Write_Com(0x80+0x40+13);LCD_Write_Com(0x0f);break;
case 3:wave=1;break;
case 4:LCD_Clear();wave=0;wei=0;LCD_Write_Com(0x80+0x40+2);LCD_Write_Com(0x0f);break;
         case 5:wave=2;s5num=0;break;
}
}
//keyscan_done=1;//按键处理完毕
}
if(s5num！=0)
{
   if(s3==0)
   {
   delay(10);
   if(s3==0)//s3被按下
   {
   led2=0;
   delay(30);
   while(！s3);//确认按键释放
   led2=1;
   switch(s5num)
   {
   case 1:T=T+10;
         if(T>90){T=10;}
         o=T/10;
r1=(1000/T)/100;
r2=((1000/T)/10)%10;
r3=(1000/T)%10;
wei=1;
         //LCD_Write_Data(2,1,t1);
         break;
   case 2:D+=10;
         if(D>90){D=10;}
         p=D/10;
wei=2;
         //LCD_Write_Data(13,1,d1);
         break;
   case 4:C+=50;
         if(C>250){C=50;}
         q1=C/100;
q2=(C/10)%10;
wei=3;
         //LCD_Write_Data(3,1,c1);
         break;
   }
   }
   }
   if(s4==0)
   {
   delay(10);
   if(s4==0)
   {
   led2=0;
   delay(30);
   while(！s4);
   led2=1;
   switch(s5num)
   {
   case 1:T-=10;
         if(T<10){T=90;}
         o=T/10;
r1=(1000/T)/100;
r2=((1000/T)/10)%10;
r3=(1000/T)%10;
wei=1;
         //LCD_Write_Data(2,1,t1);
         break;
   case 2:D-=10;
         if(D<10){D=90;}
         p=D/10;
wei=2;
         //LCD_Write_Data(13,1,d1);
         break;
   case 4:C-=50;
         if(C<50){C=250;}
         q1=C/100;
q2=(C/10)%10;
wei=3;
         //LCD_Write_Data(3,1,c1);
         break;
   }
   }
   }
//keyscan_done=1;//按键处理完毕
   }
   keyscan_done=1;//按键处理完毕
}
//-------------------------------------------
void choosewave()
{
switch(wei)
{
case 1:LCD_Write_String(0,0,"DSF  FB  F:");LCD_Write_String(14,0,"Hz");
      LCD_Write_String(0,1,"T:");LCD_Write_String(4,1,"Ms");LCD_Write_String(9,1,"D/T:");LCD_Write_Char(15,1,'%');
         LCD_Write_Char(2,1,0x30+o);LCD_Write_Char(3,1,'0');
         LCD_Write_Char(12,0,0x30+r2);LCD_Write_Char(13,0,0x30+r3);LCD_Write_Com(0x0c);break;
case 2:LCD_Write_Char(13,1,0x30+p);LCD_Write_Char(14,1,'0');LCD_Write_Com(0x0c);break;
case 3:LCD_Write_String(0,0,"DSF  PWM       ");
      LCD_Write_String(0,1,"C:");LCD_Write_String(5,1,"Us       ");
         LCD_Write_Char(2,1,0x30+q1);LCD_Write_Char(3,1,0x30+q2); LCD_Write_String(4,1,"0");LCD_Write_Com(0x0c);break;
default:break;
}

switch(wave)
{
case 1:pwm=1;fangbo();
         break;
case 2:fang=1;PWM();
         break;
default:break;
}
keyscan_done=0;
}
//-------------------------------------------
void main()
{
s3=1;
s4=1;//初始换按键
  s5=1;
led1=1;//初始化按键指示灯
led2=1;
LCD_Init();          //初始化液晶
  delay(20);       //延时有助于稳定
LCD_Write_String(0,0,"0123456789ABCDEF");
LCD_Write_String(0,1,"0123456789ABCDEF");
delay(5000);
  LCD_Clear();//清屏
while(1)
{
keyscan1();
if(keyscan_done)
   choosewave();
}
}

谢谢师傅分享代码

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