stm32的定时器上升沿下降沿双触发

void TIM5_Configuration(unsigned short frequency)

{ //8000

NVIC_InitTypeDef NVIC_InitStructure;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_ICInitTypeDef TIM_ICInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //GPIOA0

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度100MHz

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; //下拉

GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA0

GPIO_PinAFConfig(GPIOA,GPIO_PinSource0,GPIO_AF_TIM5); //PA0复用位定时器5

TIM_DeInit(TIM5);

TIM_TimeBaseStructure.TIM_Period = frequency;

TIM_TimeBaseStructure.TIM_Prescaler = 1;

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //设置计数器模式为向上计数模式

TIM_TimeBaseInit(TIM5,&TIM_TimeBaseStructure); //将配置应用到TIM2中

TIM_ClearFlag(TIM5, TIM_FLAG_Update); //清除溢出中断标志

//初始化TIM5输入捕获参数

TIM5->CCER &= (uint16_t)~((uint16_t)TIM_CCER_CC1E); //捕获禁止

TIM5->CCMR1 |= 0x03; // IC1映射在TRC上

TIM5->SMCR |= (1 << 6); //TI1的边沿检测器

TIM5->SMCR &= ~((1 << 5) | (1 << 4));

TIM5->CCER |= ((uint16_t)TIM_CCER_CC1E); //捕获使能

NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断

TIM_Cmd(TIM5, ENABLE);//DISABLE);

}

void TIM5_IRQHandler(void)

{

if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)//是更新中断

{

TIM_ClearITPendingBit(TIM5, TIM_IT_Update); //清除TIM3更新中断标志

}

if(TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//捕获1发生捕获事件

{

TIM_ClearITPendingBit(TIM5, TIM_IT_CC1); //清除TIM3更新中断标志

if(GPIOA->IDR & 0x0001) //上升沿

{

testcnt1++;

}

else

{

testcnt2++;

}

}

}