STM32输入捕获模式设置并用DMA接收数据

注意：

除TIM6和TIM7之外的定时器都只能采用上升沿或者下降沿捕捉而不能采用双边沿捕捉.

#define  TIM_ICPolarity_Rising             ((uint16_t)0x0)#define  TIM_ICPolarity_Falling            ((uint16_t)0x2)#define  TIM_ICPolarity_BothEdge           ((uint16_t)0xA)#define IS_TIM_IC_POLARITY(POLARITY) (((POLARITY) == TIM_ICPolarity_Rising)  ((POLARITY) == TIM_ICPolarity_Falling))#define IS_TIM_IC_POLARITY_LITE(POLARITY) (((POLARITY) == TIM_ICPolarity_Rising)  ((POLARITY) == TIM_ICPolarity_Falling) ((POLARITY) == TIM_ICPolarity_BothEdge))