STC12c5a60s2通过晶闸管调光问题

只看该作者 · 2015-7-7 22:29

本帖最后由 S96TBN 于 2015-7-7 22:34 编辑

用stc12c5a60s2单片机内部自带的pwm寄存器通过双向晶闸管调光 p37接的独立按键按一下输出不同占空比的pwm波占空比是通过CCAP0H（最大值0xff 也就是255）调节的 CCAP0H 取（255/8）x1,2，3....8 用switch case语句输出但是做成实物发现pwm没有控制效果撤掉pwm以后灯泡依然亮  仿真图和程序如下求大神指导忘记补充了实物光耦是moc3023 双向可控硅是 bt138
#include <12C5A.H>                      //??STC12????????
#define uchar unsigned char                //???

sbit kp1=P3^7;                                              //pwm1 ???+

uchar count,count1;                               //c??pwm1 c1??pwm2
/********************???????***************/

      uchar a1,b1,i1;
//nms????
void delayms(uchar n)
{

      for(i1=0;i1<n;i1++)
      {
      for(a1=120;a1>0;a1--)
      for(b1=225;b1>0;b1--);
      }
}

/**************************END********************/

/***********************???***********************/
void main()
{

      P0=0;                                              //????
      P2M1=0xff;
      P2M0=0x00;                                     //?P2?????????
      P1M1=0x00;
      P1M0=0xFF;
      CCON=0;                                              //???PCA?????
                                                            //PCA???????
                                                            //?? CF ??

      CL=0;                                              //PCA ?????
      CH=0;

      CMOD=0x00;                                     //????????PCA?????
                                                            //??PCA????

      CCAP0H=CCAP0L=0xFF;                      //PWM0 ???????0?????
      CCAP1H=CCAP1L=0xFF;
      CCAPM0=0x42;                               //PCA module-0 ???PWM??
                                                            //?PCA??
      //CCAPM1=0x42;

      CR=1;                                              //PCA ?????

while(1)
{



         if(kp1==0)                                                                      //zkb1+
         {
                  delayms(2);
               if(kp1==0)
               {
                        count=count+1;
                     if(count>2)
                     count=0;
               }
               while(!kp1);
         }

               switch(count)
               {
                     case 0:  CCAP0H=0x0f; break;
                     case 1:       CCAP0H=0X1f; break;                                     // 1/8
                     case 2:       CCAP0H=0X3F; break;       // 2/8 3f
                     case 3:       CCAP0H=0X5F; break;                                     // 3/8
                     case 4:       CCAP0H=0X7F; break;                                     // 4/8
                     case 5:       CCAP0H=0X9F; break;                                     // 5/8
                     case 6:       CCAP0H=0XbF; break;       // 6/8
                     case 7:       CCAP0H=0XdF; break;                                     // 7/8
                     case 8:       CCAP0H=0XfF; break;                                     // 8/8
               }


      }

}