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標題: STM32F103的基于定時器的PWM波產生 [打印本頁]

作者: 悲酥清風 時間: 2018-8-16 11:15
標題: STM32F103的基于定時器的PWM波產生
本例用的是定時器2，產生脈沖為1KHz

void time2_pwm(int period,int Prescaler)
{
  GPIO_InitTypeDef       GPIO_InitStructure;
      TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
      TIM_OCInitTypeDef    TIM_OCInitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); /*????2??*/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); /*GPIO????*/

  /*????*/
                  /*??GPIO*/
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;             /*????*/
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  /*??TIMER2*/
                  /*??TIMER2*/
  TIM_DeInit(TIM2);                                              /*??????2*/
  TIM_TimeBaseStructure.TIM_Period = period;                   /*??? ??????3600-1 ???0??*/
  TIM_TimeBaseStructure.TIM_Prescaler = Prescaler;             /*????*/
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;       /*????*/
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;    /*????*/
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  /*??TIMER2PWM??*/
                  /*??TIMER2PWM??*/
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;             /*PWM2????*/
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; /*??????*/
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;       /*????? ?????*/
  /*??1*/
//  TIM_OCInitStructure.TIM_Pulse =40*36;
//  TIM_OC1Init(TIM2, &TIM_OCInitStructure);
//  TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
  /*??2*/
  TIM_OCInitStructure.TIM_Pulse =0;          /*?????*/
  TIM_OC2Init(TIM2, &TIM_OCInitStructure);       /*?????TIMx ??*/
  TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);/*CH1?????*/
  /*??3*/
//  TIM_OCInitStructure.TIM_Pulse =90*36;
//  TIM_OC3Init(TIM2, &TIM_OCInitStructure);
//  TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
  /*??4*/
//  TIM_OCInitStructure.TIM_Pulse =0*36;
//  TIM_OC4Init(TIM2, &TIM_OCInitStructure);
//  TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM2, ENABLE); /*??TIMx?ARR????????*/
  TIM_Cmd(TIM2, ENABLE);             /*?????2*/

}
產生頻率為72MHz/m 占空比為oxy%，可以視情況自行修改
time2_pwm(m-1,0);
TIM_SetCompare2(TIM2,oxy*m);

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