定时器实验LED怎么只亮不闪烁？

赵赶驴

编译后无错误无警告，附程序如下：

#include<stm32f10x.h>         

void GPIO_Configuration(void);

void RCC_Configuration(void);

void TIM_Configuration(void);

void NVIC_Configuration(void);

int main(void)

{

RCC_Configuration();

NVIC_Configuration();

GPIO_Configuration();

TIM_Configuration();

    

while(1)

; //死循环

}

void GPIO_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; 

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOE, &GPIO_InitStructure);

}

void RCC_Configuration(void)

{

SystemInit();

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

}

void NVIC_Configuration(void)

{

  NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn; //irqn

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

void TIM_Configuration(void)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    TIM_TimeBaseStructure.TIM_Period=7199;

    TIM_TimeBaseStructure.TIM_Prescaler=9999;

TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down;

TIM_TimeBaseInit(TIM2, & TIM_TimeBaseStructure);

TIM_ClearFlag(TIM2, TIM_FLAG_Update);

    TIM_ARRPreloadConfig(TIM2, ENABLE);

TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE );

TIM_Cmd(TIM2, ENABLE);

}

void TIM2_Handler(void)

{

if(TIM_GetITStatus(TIM2, TIM_IT_Update)== RESET)

{

TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

GPIO_WriteBit(GPIOE, GPIO_Pin_2,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOE, GPIO_Pin_2)));

}

}

正点原子

直接用我们例程测试下

赵赶驴

回复【楼主位】赵赶驴:
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回复【2楼】正点原子:
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把if(TIM_GetITStatus(TIM2, TIM_IT_Update)== RESET)改为if(TIM_GetITStatus(TIM2, TIM_IT_Update)== SET)时就闪烁了，但不知道为什么是RESET时就不行了？

miaoguoqiang

一产生中断 TIM_IT_Update就置位 等于SET。才会进if语句，才会清中断标志位，才会进入你的LED翻转