帮我看看改的输入捕获，我把tim5改为tim1，怎么不能用呢？

jiutianshenjian · 发表于 2014-11-8 11:15:53

TIM1_Cap_Init(9999, 7199); //每隔1秒检查一次，有多少次上升沿触发，频率就是多少

void TIM1_Cap_Init(u16 arr,u16 psc)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM1_ICInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //使能TIM5时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //PA8 清除之前设置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA8下拉输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_ResetBits(GPIOA,GPIO_Pin_8);

//初始化定时器5 TIM5
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

//初始化TIM5输入捕获参数
    TIM1_ICInitStructure.TIM_Channel = TIM_Channel_1; //选择通道3
TIM1_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
TIM1_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM1_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
TIM1_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM1, &TIM1_ICInitStructure);

//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; //这里要不要加这个TIM1_CC_IRQn
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); //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 | TIM_IT_CC1,ENABLE); //允许更新中断,允许CC1IE捕获中断

TIM_Cmd(TIM1,ENABLE ); //使能定时器5
}

static u8 RisingNum = 0; //输入捕获次数

/*定时器5中断处理函数*/
void TIM1_UP_IRQHandler(void)
{
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //1秒定时到
{
TIM_ClearITPendingBit(TIM1, TIM_IT_Update); //清除中断标志位
      f = RisingNum;//获取上升沿触发次数
}

if (TIM_GetITStatus(TIM1, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
{
TIM_ClearITPendingBit(TIM1, TIM_IT_CC1); //清除中断标志位
RisingNum++;
}
}

因为我需要采集pa8的上升沿，所以是不是必须用pa8上的tim1通道1呢？
硬件已经将频率采集连接到PA8,我只能选择TIM1CH1了吧？

只能进一次中断处理，就再不进来了。

jiutianshenjian · 发表于 2014-11-8 13:34:30

我改成这样也一样只进去一次

/*定时器5中断处理函数*/
void TIM1_UP_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //1秒定时到
    {
        TIM_ClearITPendingBit(TIM1, TIM_IT_Update); //清除中断标志位
        f = RisingNum;//获取上升沿触发次数

        RisingNum = 0;//下一秒重新计数
    }
}

void TIM1_CC_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM1, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
    {
        TIM_ClearITPendingBit(TIM1, TIM_IT_CC1); //清除中断标志位

        RisingNum++;
    }
}

jiutianshenjian · 发表于 2014-11-8 14:02:40

是不是得用两个tim，tim1捕获，另一个update？

孤独寂寞冷。。。

再这样：NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn | TIM1_CC_IRQn;

只进入cc1中断，不进入update中断

正点原子 · 发表于 2014-11-8 14:20:36

把清除中断标志位放if外面试试。

jiutianshenjian · 发表于 2014-11-8 14:36:10

回复【4楼】正点原子:
---------------------------------
一样。一直可以进cc1，进不去update中断。我分开了，还把update优先级设置高

//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;  //TIM3中断   TIM1_CC_IRQn
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;  //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);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;  //TIM3中断   TIM1_CC_IRQn
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);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器