89C52 PWM輸出程序

#include <reg52.h> //Keil header file name
#include "use.h"
#include "Ver.h"

//extern void LedOut(unsigned char *pLed);
#define Pmax 55000 //55000 //42666(18.4320)
#define Ki 2.2     //i=2

//----------------------------
sbit PwinPin=P3^5;
//----------------------------

typedef union 
{
  unsigned int Pwm;   //pwm的數(shù)據(jù)
  unsigned char PwmUse[2]; //[0]=H;[1]=L
}PWM;

//----------------------------
PWM     PwmData;
unsigned int PwmBak;
//----------------------------
unsigned char PwmF=0;   //輸出的1,0的標(biāo)志
/*****************************************
PWM計算，輸出
t0=T50ms(b0/[fs-fo]+Sgn(U)*20%+a1
;T50ms=Pwm50+Ah
;B0<fo=>0V;Must Bo In(Fo-Fs)
*******************************************/
void PwmOut(void)
{
  float Pwm,i,k,j;
  k=Pmax+(Mp1.AH+OminH)*Ki;
  i=(PminL+Mp1.AL)*Ki;

//----------------------------
//LedOut(LedBuf);     //LED顯示輸出
//----------------------------
  j=(LedMenu.B-Mp1.Fo)/(Mp1.Fs-Mp1.Fo);
  if(j<0) j=0;
  if(j>1) j=1;
  Pwm=j*k; //Bo/(Fs-Fo)*Pk
  j=Pwm*0.8+k*0.2+i; //先計算
  if(Mp1.U==1) {Pwm=j;}
  else Pwm=Pwm+i;
  TR0=0;
  PwmBak=(unsigned int)Pwm; //更新數(shù)據(jù)
  TR0=1;
}
//-------------------------------
void Init_Pwm(void)
{
  PwmData.Pwm=0;
  PwmPin=0;       //輸出0 （地點(diǎn)平）
// PwmOut();
}
//定時器0 中斷處理 pwmout()
void T0_Do(void) interrupt 1{
  TR0=0;
  if(PwmF==0) //輸出高電平
  {
    PwmData.Pwm=-PwmBak;
    TH0=PwmData.PwmUse[0];
    TL0=PwmData.PwmUse[1];
    PwmPin=1;       //0 輸出
    PwmF=1;
  }else{
    PwmData.Pwm=-PwmData.Pwm;
    TH0=PwmData.PwmUse[0];
    TL0=PwmData.PwmUse[1];   
    PwmPin=0;       //1 輸出
    PwmF=0;
  }
  TR0=1;
}