利用STM32的PWM模块发出固定个数的PWM脉冲

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z258121131 发布时间：2016-9-22 15:46

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由于项目需要，需要发出固定个数的PWM脉冲，因为未接触过网上搜集的也多不行，后来根据官方手册调试成功。使用的第一种方式，后续的测试后放出。
void PWMS8_Init()
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
/* TIM4 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
  /* GPIOB clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
  /* TIM4_CH1 pin (PB.06) configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = 200;
  TIM_TimeBaseStructure.TIM_Prescaler = 7200;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 5;
  TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

TIM_GenerateEvent(TIM8,TIM_EventSource_Update);
TIM_InternalClockConfig(TIM8);
TIM_SelectOCxM(TIM8,TIM_Channel_2,TIM_OCMode_PWM1);
/* PWM1 Mode configuration: Channel2 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 100;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC2Init(TIM8, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM8, ENABLE);
  /* TIM8 enable counter */
TIM_CtrlPWMOutputs(TIM8,ENABLE);

TIM_SelectOnePulseMode(TIM8,TIM_OPMode_Single);
  TIM_Cmd(TIM8, ENABLE);
}

以上是核心代码，自己可根据需要修改，生成不同个数以及频率的脉冲。