拿起书本 发表于 2013-8-7 22:47 
测试后，发现进去一次之后就没再进中断了。
but为啥会进去一次了？不是一次都不应该进中断的吗 ...
同学，注意这个函数的最后一句的功能。
- /**
- Initializes the TIMx Time Base Unit peripheral according to
- * the specified parameters in the TIM_TimeBaseInitStruct.
- * @param TIMx: where x can be 1 to 17 to select the TIM peripheral.
- * @param TIM_TimeBaseInitStruct: pointer to a TIM_TimeBaseInitTypeDef
- * structure that contains the configuration information for the
- * specified TIM peripheral.
- * @retval None
- */
- void TIM_TimeBaseInit(TIM_TypeDef* TIMx, TIM_TimeBaseInitTypeDef* TIM_TimeBaseInitStruct)
- {
- uint16_t tmpcr1 = 0;
- /* Check the parameters */
- assert_param(IS_TIM_ALL_PERIPH(TIMx));
- assert_param(IS_TIM_COUNTER_MODE(TIM_TimeBaseInitStruct->TIM_CounterMode));
- assert_param(IS_TIM_CKD_DIV(TIM_TimeBaseInitStruct->TIM_ClockDivision));
- tmpcr1 = TIMx->CR1;
- if((TIMx == TIM1) || (TIMx == TIM8)|| (TIMx == TIM2) || (TIMx == TIM3)||
- (TIMx == TIM4) || (TIMx == TIM5))
- {
- /* Select the Counter Mode */
- tmpcr1 &= (uint16_t)(~((uint16_t)(TIM_CR1_DIR | TIM_CR1_CMS)));
- tmpcr1 |= (uint32_t)TIM_TimeBaseInitStruct->TIM_CounterMode;
- }
- if((TIMx != TIM6) && (TIMx != TIM7))
- {
- /* Set the clock division */
- tmpcr1 &= (uint16_t)(~((uint16_t)TIM_CR1_CKD));
- tmpcr1 |= (uint32_t)TIM_TimeBaseInitStruct->TIM_ClockDivision;
- }
- TIMx->CR1 = tmpcr1;
- /* Set the Autoreload value */
- TIMx->ARR = TIM_TimeBaseInitStruct->TIM_Period ;
- /* Set the Prescaler value */
- TIMx->PSC = TIM_TimeBaseInitStruct->TIM_Prescaler;
- if ((TIMx == TIM1) || (TIMx == TIM8)|| (TIMx == TIM15)|| (TIMx == TIM16) || (TIMx == TIM17))
- {
- /* Set the Repetition Counter value */
- TIMx->RCR = TIM_TimeBaseInitStruct->TIM_RepetitionCounter;
- }
- /* Generate an update event to reload the Prescaler and the Repetition counter
- values immediately */
- TIMx->EGR = TIM_PSCReloadMode_Immediate;
- }
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