STM32F0定时器PWM模式输出不同频率方波程序
来源: 芯艺

系统时钟24M



void TIM3_Config(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  //NVIC_InitTypeDef NVIC_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  
  //引脚复用配置  PA6 用作TIM3_CH1
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_1); 
  //引脚配置
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);  

  //TIM3时钟使能
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

  //TIM3中断配置
  /*
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);*/

  //定时时间计算:((1+TIM_Prescaler)/48M)*(1+TIM_Period) 
  TIM_DeInit(TIM3);            //复位定时器
  TIM_TimeBaseStructure.TIM_Period=1000;  //定时器溢出值
  TIM_TimeBaseStructure.TIM_Prescaler=24-1;         //时钟预分频
  TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;  // 时钟分割
  TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
  TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);   //初始化定时器的值
  
  TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);
  
  TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);//使能预装载寄存器
  TIM_ARRPreloadConfig(TIM3, ENABLE);//使能重装载寄存器
  
  //TIM_ClearFlag(TIM3,TIM_FLAG_Update);      //清除定时器中断标志  
  //TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);//中断使能
  TIM_Cmd(TIM3, ENABLE);//定时器使能
}

void TIM3_WaveOutput(uint32_t freq)
{
  uint32_t PeriodPFM;
  
  if(freq==0)
  {
    TIM_SetCompare1(TIM3,0);
    return ;
  }
  PeriodPFM=1000000/freq;
  TIM_SetAutoreload(TIM3,PeriodPFM);
  TIM_SetCompare1(TIM3,PeriodPFM/2);
  TIM_Cmd(TIM3,ENABLE);
}



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