用的stm32 TIM2的PWM输出, 初始化的代码是

void TIM_GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* GPIOA, GPIOB Clocks enable */
  RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB , ENABLE);

  /* GPIOA Configuration: Channel 1, 2, 3, 4 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_PinAFConfig(GPIOA, GPIO_PinSource0, GPIO_AF_TIM2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_TIM2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_TIM2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_TIM2);
}

void TIM_PWM_Init(void)
{
  /* TIM2 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  /* Time Base configuration */
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  //TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  TIM_OCInitTypeDef  TIM_OCInitStructure;
  /* Channel 1, 2,3 and 4 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // PWM: trigger from valid -> invalid
  // TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  //TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  // Specifies the TIM Output Compare pin state during Idle state, ## valid only for TIM1 and TIM8 ##
  //TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  //TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

  //Specifies the TIM Output Compare state
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

  TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
  TIM_OC1Init(TIM2, &TIM_OCInitStructure);
  // TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);

  TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
  TIM_OC2Init(TIM2, &TIM_OCInitStructure);
  // TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
  
  TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;
  TIM_OC3Init(TIM2, &TIM_OCInitStructure);

  TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;
  TIM_OC4Init(TIM2, &TIM_OCInitStructure);

  /* TIM2 counter enable */
  TIM_Cmd(TIM2, ENABLE);
}




【 在 hitkiller 的大作中提到: 】
: 不太明白，你这上桥臂的pwm是怎么输出的，自举么
:
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