pwm.c

s12温度控制程序,包括模糊控制和LCD程序

#include <hidef.h>      /* common defines and macros */
#include "all_head.h"
#include <mc9s12dg128.h>     /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"


 
/***************************************************************/
/*init_pwm(): initializes s12 pulses width modulation system   */
/*choose the periods of PWMx are 2s                            */

// PORTA_BIT0  --->  PORTA_BIT2用于通道选择
/***************************************************************/
  void PWM_Ini(void)
{
  PWME = 0x00;              //pwm unenable
  PWMPRCLK = 0x77;          //select clock prescale for pwm  A = Bus/128 B = Bus/128  
  PWMSCLA = 250;            //select scale for pwm   SA= A/(2*250)
  PWMSCLB = 250;            //select scale for pwm   SB= B/(2*250)
  PWMCLK_PCLK0 = 1;         //8bit PWM0 channal choose the clock SA 
  PWMCLK_PCLK1 = 1;         //8bit PWM1 channal choose the clock SA 
  PWMCLK_PCLK2 = 1;         //8bit PWM2 channal choose the clock SB 
  PWMCLK_PCLK3 = 1;         //8bit PWM3 channal choose the clock SB 
  PWMCLK_PCLK4 = 1;         //8bit PWM4 channal choose the clock SA 
  PWMCLK_PCLK5 = 1;         //8bit PWM5 channal choose the clock SA 
  PWMCLK_PCLK6 = 1;         //8bit PWM6 channal choose the clock SB 
  PWMCLK_PCLK7 = 1;         //8bit PWM7 channal choose the clock SB 
  PWMPOL = 0xff;            //select polarity first high
  PWMCAE = 0x00;            //select center or left aligned mode___left mode
  
  PWMPER0 = 250;            //select the period of pwm0
  PWMPER1 = 250;            //select the period of pwm1
  PWMPER2 = 250;            //select the period of pwm2
  PWMPER3 = 250;            //select the period of pwm3
  PWMPER4 = 250;            //select the period of pwm4
  PWMPER5 = 250;            //select the period of pwm5
  PWMPER6 = 250;            //select the period of pwm6
  PWMPER7 = 250;            //select the period of pwm7
  
  PWMDTY0 = 100;            //initial the duty of pwm0
  PWMDTY1 = 100;            //initial the duty of pwm1
  PWMDTY2 = 100;            //initial the duty of pwm2
  PWMDTY3 = 100;            //initial the duty of pwm3
  PWMDTY4 = 100;            //initial the duty of pwm4
  PWMDTY5 = 100;            //initial the duty of pwm5
  PWMDTY6 = 100;            //initial the duty of pwm6
  PWMDTY7 = 100;            //initial the duty of pwm7
   
  PWME = 0xff;              //enable the all of pwm channal  
}

 void PWM_Generate(char list,uchar duty) 
 {
   switch(list) 
   {
    case 0:
      PWMDTY0 = duty;
      break;
    case 1:
      PWMDTY1 = duty;
      break;
    case 2:
      PWMDTY2 = duty;
      break;
    case 3:
      PWMDTY3 = duty;
      break;
    case 4:
      PWMDTY4 = duty;
      break;
    case 5:
      PWMDTY5 = duty;
      break;
    case 6:
      PWMDTY6 = duty;
      break;
    case 7:
      PWMDTY7 = duty;
      break;
    default:
      PWMDTY0 = 100;
      break;
   }
 }

 int Frequence_sample(void) 
 {
   int temp;
   temp = PACN10;       //采用16位的脉冲累加器B进行计数
   PACN10 = 0;           //计数器清零
   return temp;
 }                  

 
 int Feedback(void){
   int temp;
   temp = PACN10;
   PACN10 = 0;
   return temp;
 }
 
void ChannelChoose(char num)     //maybe need change because of the function of tlp521
{
  switch(num) 
  {                           
    case 0:
      PORTA_BIT0 = 0;
      PORTA_BIT1 = 0;
      PORTA_BIT2 = 0;
      break;
    case 1:
      PORTA_BIT0 = 1;
      PORTA_BIT1 = 0;
      PORTA_BIT2 = 0;
      break;
    case 2:
      PORTA_BIT0 = 0;
      PORTA_BIT1 = 1;
      PORTA_BIT2 = 0;
      break;
    case 3:
      PORTA_BIT0 = 1;
      PORTA_BIT1 = 1;
      PORTA_BIT2 = 0;
      break;
    case 4:
      PORTA_BIT0 = 0;
      PORTA_BIT1 = 0;
      PORTA_BIT2 = 1;
      break;
    case 5:
      PORTA_BIT0 = 1;
      PORTA_BIT1 = 0;
      PORTA_BIT2 = 1;
      break;
    case 6:
      PORTA_BIT0 = 0;
      PORTA_BIT1 = 1;
      PORTA_BIT2 = 1;
      break;
    case 7:
      PORTA_BIT0 = 1;
      PORTA_BIT1 = 1;
      PORTA_BIT2 = 1;
      break;
    default:
      PORTA_BIT0 = 0;
      PORTA_BIT1 = 0;
      PORTA_BIT2 = 0;
      break;
  }
   
}