STM32 Tim1 CH2 PWM波形翻转！求解，楼下贴代码

Andrew866 · 发表于 2016-7-25 14:36:08

我定时器1通道2（PE11脚）配置成PWM输出，可是波形是反的，我设置占空比是80%，实际输出是20%
定时器8的四个通道完全正常！  求解，求吧友帮助！

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

      GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

      TIM_TimeBaseStructure.TIM_Period = 1000;
      TIM_TimeBaseStructure.TIM_Prescaler = 71;
      TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse = 200;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
      TIM_OC2Init(TIM1, &TIM_OCInitStructure);

      TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

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