STM32F1 103 C8T6 无法输出PWM

牵手 · 发表于 2018-12-15 12:10:15

哪位朋友帮忙看看这个程序为什么PWM 口PA1无法输出PWM，用的是TIM2
void TIM2_CH1(void)
{
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2  , ENABLE); ///时钟打开
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA| RCC_APB2Periph_GPIOA  , ENABLE);
   TIM_TimeBaseInitTypeDef  TIM_TimeBaseInitStruct;
   TIM_OCInitTypeDef       TIM_OCInitStruct;

   GPIO_InitTypeDef GPIO_InitStruct;
      GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;  ///PA0口作为输出PWM口
   GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_Init(GPIOA, &GPIO_InitStruct);

   TIM_TimeBaseInitStruct.TIM_Period =100; ///125KHz / //
   TIM_TimeBaseInitStruct.TIM_Prescaler = 36-1;  /////预分频
   TIM_TimeBaseInitStruct.TIM_ClockDivision = 0;
   TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
   TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);

   TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1;///PWM模式1
   TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Disable;
   TIM_OCInitStruct.TIM_Pulse=100/2;////占空比
   TIM_OC1Init(TIM2, &TIM_OCInitStruct);

   TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
   TIM_ARRPreloadConfig(TIM2, ENABLE);
   TIM_Cmd(TIM2, ENABLE); ///使能
}