各路大神，tim1_ch4 无法pwm输出

qf070

求教，下面TIM1_CH4(PA11) PWM无法输出，是哪些不对？


void TIM1_CH4_Init(void)
{

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

  GPIO_InitTypeDef GPIOA_Initstructure;
  GPIOA_Initstructure.GPIO_Pin = GPIO_Pin_11;
  GPIOA_Initstructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIOA_Initstructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIOA_Initstructure);


  TIM_TimeBaseInitTypeDef TIM1_CH4_Handler;
  TIM1_CH4_Handler.TIM_Period = (40 - 1);
  TIM1_CH4_Handler.TIM_Prescaler = (72 - 1);
  TIM1_CH4_Handler.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM1_CH4_Handler.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM1,&TIM1_CH4_Handler);


  TIM_OCInitTypeDef  TIM_OCInitStructure;
  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_Reset;

  uint16_t pulse = (float)50 / 100 * (40 - 1 + 1);
  TIM_OCInitStructure.TIM_Pulse = pulse;

  TIM_OC4Init(TIM1, &TIM_OCInitStructure);

  TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);
  TIM_Cmd(TIM1, ENABLE);
}

qf070

自己顶一下

qf070

自己顶一下

pi1225

帮顶！！！