求助，STM32F407的PWM输出有问题

liujia · 发表于 2016-11-24 14:35:01

本帖最后由 liujia 于 2016-11-25 17:19 编辑

求助，原子的F407PWM程序，例程是PF9  TIM14有波形输出，我自己加个PF8直接copy过来，就把端口改了，为什么PF8的TIM13没有波形输出了

int main(void)
{

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      uart_init(115200);

      PWM_Init(1700,4-1);

   while(1)
      {


      TIM_SetCompare1(TIM14,100);
      TIM_SetCompare1(TIM13,100);

      }
}

void PWM_Init(u32 arr,u32 psc)
{

      GPIO_InitTypeDef GPIO_InitStructure;
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM13,ENABLE);

      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);
      GPIO_PinAFConfig(GPIOF,GPIO_PinSource9,GPIO_AF_TIM14);
      GPIO_PinAFConfig(GPIOF,GPIO_PinSource8,GPIO_AF_TIM13);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
      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(GPIOF,&GPIO_InitStructure);

      TIM_TimeBaseStructure.TIM_Prescaler=psc;
      TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
      TIM_TimeBaseStructure.TIM_Period=arr;
      TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

      TIM_TimeBaseInit(TIM13,&TIM_TimeBaseStructure);
      TIM_TimeBaseInit(TIM14,&TIM_TimeBaseStructure);

      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

      TIM_OC1Init(TIM13, &TIM_OCInitStructure);
      TIM_OC1Init(TIM14, &TIM_OCInitStructure);


      TIM_OC1PreloadConfig(TIM13, TIM_OCPreload_Enable);
      TIM_OC1PreloadConfig(TIM14, TIM_OCPreload_Enable);

   TIM_ARRPreloadConfig(TIM13,ENABLE);
   TIM_ARRPreloadConfig(TIM14,ENABLE);

      TIM_Cmd(TIM13, ENABLE);
      TIM_Cmd(TIM14, ENABLE);

}