pwm代码

仁者 · 发表于 2010-1-24 16:07:49

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

void pwminitial()
{
  PWMPOL=0X01;  //通道0输出波形开始极性为1  output waveform which high first then low when the duty counter is reached
  PWMCAE=0x00; //左对齐输出模式          output left align waveform
  PWMCLK=0X01; //PWM时钟源为             SAClock SA is the clock source for PWM channel 0
  PWMPRCLK=0X03;  //时钟A8分频             Clock A is 8MHz/8=1MHz
  PWMSCLA=0X80; //时钟SA为1MHz/128/2       Clock SA is 1MHz/128/2=4KHz

  PWMPER0=255; //设定输出周期=通道时钟周期*256
  PWMDTY0=0; //占空比初始为0          Duty is 50%,and PWM waveform's frequent is 16
  PWME=0X01; //通道0使能                enable pwm channel 0
}
void main()
{
  pwminitial();
  DDRB=0XFF;
  while(1)
{
  int i;


  for(i=0;i<30000;i++)
{if(PTP_PTP0==0)    //PTP0口作为输出引脚
PORTB=0X00;
  else
PORTB=0XFF;
_asm "nop";
_asm "nop";
_asm "nop";
}
PWMDTY0++;
}
  EnableInterrupts;
  for(;;) {} /* wait forever */
  /* please make sure that you never leave this function */
}

shifeng570 · 发表于 2010-1-24 18:31:46

很好

fengnan · 发表于 2010-1-25 14:35:45

thankyou

jiao19880804 · 发表于 2010-3-17 12:42:39

thanks

wyjxq139 · 发表于 2010-3-18 11:02:38

好资源挺

jiao19880804 · 发表于 2010-3-18 22:52:48

jiao19880804 · 发表于 2010-3-18 22:52:53

jiao19880804 · 发表于 2010-3-18 22:52:58

jiao19880804 · 发表于 2010-3-18 22:53:03

jiao19880804 · 发表于 2010-3-18 22:53:07

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pwm代码

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