GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOH, ENABLE);
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11  ;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
   GPIO_Init(GPIOH, &GPIO_InitStructure); 
   GPIO_PinAFConfig(GPIOH, GPIO_PinSource11, GPIO_AF_TIM5); 


PrescalerValue = (uint16_t) ((SystemCoreClock /2) / 21000000) - 1;
TIM_TimeBaseStructure.TIM_Period = 665;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
   TIM_TimeBaseStructure.TIM_ClockDivision = 0;
   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
   TIM_OCInitStructure.TIM_Pulse = 333;
   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM5, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM5, TIM_OCPreload_Enable);
 TIM_ARRPreloadConfig(TIM5, ENABLE);
 TIM_Cmd(TIM5, ENABLE);

为什么我用PH10（TIM5CH1）输出PWM波就可以，为什么我用PH11（TIM5CH2）输出PWM就不行呢，是本来就不可以输出，还是配置错了，或者是因为IO口坏了？