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標(biāo)題: 單片機(jī)pwm調(diào)速為什么占空比60和70的時(shí)候轉(zhuǎn)速?zèng)]有變化?還有為什么speed = speed*2.2 [打印本頁(yè)]

作者: Mang0 時(shí)間: 2023-4-10 09:04
標(biāo)題: 單片機(jī)pwm調(diào)速為什么占空比60和70的時(shí)候轉(zhuǎn)速?zèng)]有變化?還有為什么speed = speed*2.2

部分單片機(jī)源碼：
#define uchar unsigned char#define  uint unsigned int
void delay(uint x)          //延時(shí)函數(shù)
{
   uint i,j;
      for(i=x;i>0;i--)
         for(j=0;j<110;j++); //執(zhí)行110次約為1ms
}

void SystemInt()  //系統(tǒng)初始化
{
      TMOD = 0x51; //T0定時(shí)器 T1計(jì)數(shù)器  均采用方式1
      TH0 = (65536-250)/256;
      TL0 = (65536-250)%256;          //定時(shí)250us
      ET0 = 1; TR0 = 1;             //打開T0
      ET1 = 1;TR1 = 1;                                                       //打開T1
      TH1 = 0;
      TL1 = 0;                         //計(jì)數(shù)器初值為0
  EA = 1;                                                                                                       //開啟總中斷
      IN1 = 1;
      IN2 = 0;       //初始正轉(zhuǎn)
}

void PWMOUT()                //PWM輸出控制
{
      if(cnt<PWMTime)          //小于計(jì)數(shù)變量，輸出高電平
      {
            PWM=1;
      }
      else
      {
            PWM=0;    //大于計(jì)數(shù)變量，低電平
      }
      if(cnt>100)
            cnt=0;
}

void SetSpeed()    //速度設(shè)定
{
      if(Add==0) //速度加
      {
            delay(100);                //按鍵消抖
            if(Add==0)
            {
                     PWMTime+=10; //PWM波占空比增加10%
                              dw += 1;    //檔位加1
                              if(dw>9)
                     {
                              dw = 9;
                     }
                              while(Add==0); //松手檢測(cè)
                     }
            }
      if(Sub==0)    //如果速度減
      {
            delay(100); // 按鍵消抖
            if(Sub==0)
            {
                              PWMTime-=10; //PWM波占空比減少10%
                              dw -= 1;                               //檔位減1
                                    if(dw<0)
                     {
                              dw = 0;
                     }
                     while(Sub==0);
            }
      }
      if(zhen==0)    //正轉(zhuǎn)
      {
            delay(100);
            if(zhen==0)
            {
               IN1 = 1;
               IN2 = 0;
               while(zhen==0);
            }
      }
      if(fan==0) //反轉(zhuǎn)
      {
            delay(100);
            if(fan==0)
            {
               IN1 = 0;
               IN2 = 1;
               while(fan==0);
            }
      }
      if(Stop==0)       //停止
      {
            delay(100);
            if(Stop==0)
            {
               IN1 = 1;
               IN2 = 1;
               while(Stop==0);
            }
      }
}

void xianshi()                //數(shù)碼管顯示速度和檔位
{
      uint shi,ge;
      shi=speed/10;
      ge=speed%10;

WE1 = 0;
            P0 = table[ge]; //速度個(gè)位顯示
            delay(1);
            WE1 = 1;

            WE2 = 0;
            P0 = table[shi];    //速度十位顯示
            delay(1);
               WE2 = 1;

            WE3 = 1;

               WE4 = 0;
            P0 = table[dw];    //檔位顯示
            delay(1);
               WE4 = 1;

}

void timer0() interrupt 1 //定時(shí)器
{
      TH0 = (65536-250)/256;
      TL0 = (65536-250)%256;    //250us一次脈沖
      cnt++;
      time++;
      if(time==4000)             //1s時(shí)間內(nèi)T1的脈沖次數(shù) 1除以250us
      {
            time = 0;                //計(jì)數(shù)置0
            TR0 = 0;TR1 = 0;       //先關(guān)閉定時(shí)器
            speed = TH1;
            speed = speed << 8;    //左移8位
            speed += TL1;                                                       //賦值
            speed = speed*2.2;                //電機(jī)轉(zhuǎn)一圈產(chǎn)生24個(gè)脈沖，轉(zhuǎn)速為speed/24*60 r/min
            TH1 = 0;TL1 = 0;                                              //清0重新計(jì)數(shù)
            TR0 = 1;TR1 = 1;                                              //重新啟動(dòng)定時(shí)器
      }
}

作者: Mang0 時(shí)間: 2023-4-10 12:45
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作者: 人工置頂員 時(shí)間: 2023-4-12 15:19
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