PWM改变占空比求助，单片机STC12C5608AD。

ID:63752 · 发表于 2014-9-12 14:36

  按LEDUP键，占空比加大，按LEDDOWM，占空比减小，以下是我的程序，但是按键没反应，求帮助，谢谢～～
#include"reg51.h"
#include"intrins.h"
#define uchar unsigned char
#define uint unsigned int
//sfr AUXR=0x8e;
//sfr P_SW1=0xA2;
sfr CCON=0xD8;
sbit CCF0=CCON^0;
sbit CCF1=CCON^1;
sbit CF=CCON^7;

sfr CMOD=0xD9;
sfr CL=0xE9;
sfr CH=0xF9;
sfr CCAPM0=0xDA;
sfr CCAP0L=0xEA;
sfr CCAP0H=0xFA;
sfr PCAPWM0=0xF2;
sbit CR=CCON^6;

sbit LEDDOWN=P2^7;
sbit LEDUP=P2^5;
sbit key=P2^6;

//unsigned int counter;
//unsigned char flag;
unsigned char PWMduty=0;
unsigned char PWMduty1=0;
unsigned char temp=25;
unsigned char code DutyDC[] = {
5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100,105,110,115,120,125,130,135,140,
145,150,155,160,165,170,175,180,185,190,195,200,205,210,215,220,225,230,235,240,245,250,255
};

void Delay(uint x)
{
uint a,b;
for(a=x;a>0;a--)
   for(b=110;b>0;b--);
}
void main()
{
key=1;
CCON=0;
CL=0;
CH=0;
CMOD=0x00;//系统时钟，SYS/12,禁止中断//
PCAPWM0=0x00;
CCAP0H=CCAP0L=DutyDC[25];//50%占空比0X80//
CCAPM0=0x42;
CR=0;
while(1)
{
   if(key==0)
      {
   CR=1;
      if(LEDDOWN==0)
   {
      PWMduty++;

   if(PWMduty==500)
      {
   PWMduty=0;
   temp++;
   CCAP0H=CCAP0L=DutyDC[temp++];
   }
   }
   else if(LEDUP==0)
   {
   PWMduty1++;

   if(PWMduty1==500)
   {
      PWMduty1=0;
temp--;
   CCAP0H=CCAP0L=DutyDC[temp--];
   }
   }
   }

}
}

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