判断是否发生中断的函数

wgb123 · 发表于 2018-10-8 10:57:34

本帖最后由 wgb123 于 2018-10-8 11:22 编辑

/**  * @brief  Checks whether the TIM interrupt has occurred or not.                   //判断是否发生定时器中断
  * @param  TIMx: where x can be 1 to 17 to select the TIM peripheral.       //选择外设TIMx
  * @param  TIM_IT: specifies the TIM interrupt source to check.                //中断源下面八种之一
  * 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.
  * - TIM9, TIM12 and TIM15 can have only TIM_IT_Update, TIM_IT_CC1,
  *    TIM_IT_CC2 or TIM_IT_Trigger.
  * - TIM10, TIM11, TIM13, TIM14, TIM16 and TIM17 can have TIM_IT_Update or TIM_IT_CC1.
  * - TIM_IT_Break is used only with TIM1, TIM8 and TIM15.
  * - TIM_IT_COM is used only with TIM1, TIM8, TIM15, TIM16 and TIM17.
  * @retval The new state of the TIM_IT(SET or RESET).    //返回值
  */
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));
TIM_IT = TIM_IT_CC1=0x0002
  itstatus = TIMx->SR & TIM_IT; //  CC1IF  当捕获事件发生时该位由硬件置，这里怎么由软件置一？（输入捕获实验）
  itenable = TIMx->DIER & TIM_IT;    //使能 CC1IE

  if ((itstatus != (uint16_t)RESET) && (itenable != (uint16_t)RESET))   //由上面两个语句这个条件不是一直成立么？
  {
bitstatus = SET;
  }
  else
  {
bitstatus = RESET;
  }
  return bitstatus;
}