请教原子哥测量4路频率的问题

奋斗的小鸟 · 发表于 2014-5-14 11:18:58

我想用定时器的输入捕获功能来测量频率，例程序只给了测量一路的例子，如果我想同时或者循环测量4路频率，我该如何修改？

void TIM5_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //使能TIM5时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PA0 清除之前设置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_0);       //PA0 下拉

//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(TIM5, &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
TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上
TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM5, &TIM5_ICInitStructure);

//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM3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); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

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 ); //使能定时器5
}

wobukansanguo · 发表于 2014-5-14 11:18:59

添加捕获通道。注意，这里的通道不能通过或的方式写，必须重复设置，有几个通道设置几个。

TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01  选择输入端 IC1映射到TI1上
   TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
   TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
   TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;  //配置输入分频,不分频
   TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器不滤波
   TIM_ICInit(TIM5, &TIM5_ICInitStructure);

wobukansanguo · 发表于 2014-5-14 11:18:59

回复【3楼】奋斗的小鸟:
---------------------------------
表示对你无语。
/**
  * @brief  Checks whether the TIM interrupt has occurred or not.
  * @param  TIMx: where x can be 1 to 14 to select the TIM peripheral.
  * @param  TIM_IT: specifies the TIM interrupt source to check.
  *          This parameter can be one of the following values:
  *            @arg TIM_IT_Update: TIM update Interrupt source
  *            @arg TIM_IT_CC1: TIM Capture Compare 1 Interrupt source
  *            @arg TIM_IT_CC2: TIM Capture Compare 2 Interrupt source
  *            @arg TIM_IT_CC3: TIM Capture Compare 3 Interrupt source
  *            @arg TIM_IT_CC4: TIM Capture Compare 4 Interrupt source
  *            @arg TIM_IT_COM: TIM Commutation Interrupt source
  *            @arg TIM_IT_Trigger: TIM Trigger Interrupt source
  *            @arg TIM_IT_Break: TIM Break Interrupt source
  *
  * @note   TIM6 and TIM7 can generate only an update interrupt.
  * @note   TIM_IT_COM and TIM_IT_Break are used only with TIM1 and TIM8.
  *
  * @retval The new state of the TIM_IT(SET or RESET).
  */
ITStatus TIM_GetITStatus(TIM_TypeDef* TIMx, uint16_t TIM_IT)
{
  ITStatus bitstatus = RESET;
  uint16_t itstatus = 0x0, itenable = 0x0;
  /* Check the parameters */
  assert_param(IS_TIM_ALL_PERIPH(TIMx));
  assert_param(IS_TIM_GET_IT(TIM_IT));

  itstatus = TIMx->SR & TIM_IT;

  itenable = TIMx->DIER & TIM_IT;
  if ((itstatus != (uint16_t)RESET) && (itenable != (uint16_t)RESET))
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

调用此函数判断哪个通道发生中断。至于其中一路产生中断处理的时候，另一路又产生中断，怎么办？他们公用的一个定时器5的中断。这个就要你处理中断足够快了。