PWM波形上升沿震荡，求大佬帮忙看看

chenshoubao0 · 发表于 2020-5-19 20:18:21

单片机stm32f030
void TIM_PWM_Config(void)
{
  GPIO_InitTypeDef       GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef       TIM_OCInitStructure;

  //使能时钟
  RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);
  //打开引脚复用功能
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2);

  //使能引脚
  GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_8;
  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_UP ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

TimerPeriod = 4799;    //10k

  TIM_DeInit(TIM1); //定时器1 整体复位

  /* Time1 定时器基础设置*/
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  /* Time定时器设置为上升沿计数模式*/
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
  TIM_OCInitStructure.TIM_Pulse = 2399;//使能频道1配置
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);

  TIM_Cmd(TIM1, ENABLE);
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
}

波形上升沿震荡，求大佬帮忙看看。