timer1用于外部脉冲计数，当计数溢出后，始终进不了中断，求助！！！原子哥！！！

龙虾 · 发表于 2015-8-14 16:05:28

我用定时器2可以，但换了定时器1就不行了，求大神啊！！！
原子哥，求助！！！

TIM_ICInitTypeDef TIM1_ICInitStructure;

void TIM1_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //使能TIM1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //PA0 清除之前设置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA0 输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50M时钟速度
GPIO_Init(GPIOA, &GPIO_InitStructure);

//初始化定时器1 TIM1
TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //预分频器
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

//中断分组初始化

NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; //TIM1中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级0级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

//TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);//允许更新中断 ,允许CC1IE捕获中断
TIM1->DIER|=1<<0; //允许更新中断
TIM1->DIER|=1<<6; //允许触发中断

TIM_ETRClockMode2Config(TIM1, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0);

TIM_SetCounter(TIM1, 0);
TIM_Cmd(TIM1,ENABLE ); //使能定时器1
}

//定时器1中断服务程序
void TIM1_UP_IRQHandler(void)
{
if (TIM_GetITStatus(TIM1, TIM_IT_Update|TIM_IT_Trigger) != RESET)//溢出中断
{
x+=1;
}
TIM_ClearITPendingBit(TIM1, TIM_IT_Update|TIM_FLAG_Update); //清除中断标志位
}