求大佬帮我看看，为什么我用定时器led灯就不闪了？

1599064432 · 发表于 2019-3-22 09:17:25

void TIM3_Config(int arr,int psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler = psc;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM3,ENABLE);
}

void timer_nvic_config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void TIM3_IRQHandler(void)
{

  if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET)
  {
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
GPIO_WriteBit(GPIOB,GPIO_Pin_7,(BitAction)(!GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_7))); //状态取反
  }
}

int main()
{
  SysTick_Config_Init();
  led_gpio_init();

  while(1)
  { //((1+arr )/48M)*(1+psc )=((1+1999)/48M)*(1+23999)=1秒
GPIO_ResetBits(GPIOB,GPIO_Pin_7);
//delay_ms(1000); //1000ms = 1s
TIM3_Config(1999,23999);

GPIO_SetBits(GPIOB,GPIO_Pin_7);
//delay_ms(1000);
TIM3_Config(1999,23999);
  }
}

1599064432 · 发表于 2019-3-22 09:17:26

void led_gpio_init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE); //打开GPIO时钟 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_Init(GPIOB,&GPIO_InitStructure); //初始化 }