有没有大佬帮忙看一下这个捕获是啥问题，为啥一直进不去中断

13572680902 · 发表于 2022-7-21 16:48:32

void TIM3_Cap_Init(u16 arr,u16 psc)
{
   TIM_ICInitTypeDef TIM3_ICInitStructure;
   GPIO_InitTypeDef GPIO_InitStructure;
   TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
   NVIC_InitTypeDef NVIC_InitStructure;
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //①使能 TIM2 时钟
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //①使能 GPIOA 时钟
//初始化 GPIOA.0 ①
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //PA3 设置
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA0 输入
GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化 GPIOA.3
//②初始化 TIM2 参数
TIM_TimeBaseStructure.TIM_Period = arr-1; //设定计数器自动重装值
TIM_TimeBaseStructure.TIM_Prescaler =psc-1; //预分频器
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; // TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM 向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //初始化 TIMx
//③初始化 TIM2 输入捕获通道 1
TIM3_ICInitStructure.TIM_Channel = TIM_Channel_4; //选择输入端 IC1 映射到 TI1 上
TIM3_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
TIM3_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到 TI1 上
TIM3_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
TIM3_ICInitStructure.TIM_ICFilter = 0x00; //IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM3, &TIM3_ICInitStructure); //初始化 TIM2 输入捕获通道 1
//⑤初始化 NVIC 中断优先级分组
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM2 中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级 2 级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //从优先级 0 级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ 通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化 NVIC
TIM_ITConfig( TIM3,TIM_IT_Update|TIM_IT_CC4,ENABLE);//④允许更新中断捕获中断
TIM_Cmd(TIM3,ENABLE ); //⑥使能定时器 2

}
void TIM3_IRQHandler(void)
{
   if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)//更新中断
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
if((count_cap==1) || (count_cap==2))//高电平捕获
{
runoff1++;
}
if((count_cap==2) || (count_cap==3))//低电平捕获
{
runoff2++;
}
}
if(TIM_GetITStatus(TIM3, TIM_IT_CC4)!= RESET)//捕获中断
{
LED2_ON;
count_cap++;
TIM_ClearITPendingBit(TIM3, TIM_IT_CC4);
if((count_cap==1) && (flag==0))//第一次捕获到高电平
{
t1=TIM_GetCapture4(TIM3);//获取计数器当前值
TIM_OC4PolarityConfig(TIM3,TIM_ICPolarity_Falling);//设置为下降沿触发

}
if((count_cap==2) && (flag==0))//第二次捕获到低电平
{
t2=TIM_GetCapture4(TIM3);//获取计数器当前值
TIM_OC4PolarityConfig(TIM3,TIM_ICPolarity_Rising);//设置为上升沿触发
}
if((count_cap==3) && (flag==0))//第三次捕获到高电平
{
t3=TIM_GetCapture4(TIM3);//获取计数器当前值
TIM_Cmd(TIM3, DISABLE);//停止计数
TIM_SetCounter(TIM3, 0);//清空计数器
flag=1;//一次捕获完成
}
}

}
//获取频率
//单位：Hz
//返回0：未成功捕获
u32 Get_Fv(void)
{
u32 fv=0;
if(flag==1)//捕获完成
{
fv=(65536-t1)+t2+65536*(runoff1-1)+(65536-t2)+t3+65536*(runoff2-1);//us
fv=1000000/fv;
//开始下次捕获
flag=0;
count_cap=0;//开始下次捕获
runoff1=0;
runoff2=0;
TIM3->CNT = 0;//计数器清空
TIM_Cmd(TIM3,ENABLE);//停止计数//开始计数
}
return fv;
}
//获取占空比
//返回0：未成功捕获
u16 Get_Duty(void)
{
u16 Duty=0;
u32 high=0;
u32 low=0;
if(flag==1)//捕获完成
{
high=(65536-t1)+t2+65536*(runoff1-1);
low=(65536-t2)+t3+65536*(runoff2-1);
Duty=100*high/(high+low);
//开始下次捕获
flag=0;
count_cap=0;//开始下次捕获
runoff1=0;
runoff2=0;
TIM3->CNT = 0;//计数器清空
TIM_Cmd(TIM3,ENABLE);//开始计数
}
return Duty;
}