定时器LED闪烁

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wamcncn 发布时间：2015-1-30 21:35

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定时器配置
void TIM3_Init(void)
{

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_DeInit(TIM3);

TIM_TimeBaseInitStruct.TIM_Prescaler=23999;
TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up ;
TIM_TimeBaseInitStruct.TIM_Period=2000;
TIM_TimeBaseInitStruct.TIM_ClockDivision=0x0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);
TIM_Cmd( TIM3, ENABLE);

TIM_PrescalerConfig(TIM3, 23999, TIM_PSCReloadMode_Immediate);
TIM_ClearFlag(TIM3, TIM_FLAG_Update);
TIM_ITConfig(TIM3, TIM_IT_Update , ENABLE);

}

中断
void Nvic_Init(void)
{

NVIC_InitTypeDef  NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel =  TIM3_IRQn ;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
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(LED_PORT, LED_PIN_1 ,
            (BitAction)((1-GPIO_ReadOutputDataBit(LED_PORT, LED_PIN_1))));
}
}

int main(void)
{

SystemInit();
LED_Init();
Nvic_Init();
TIM3_Init();
while(1)
{

  }
}