TIM_EncoderInterfaceConfig (TIM I saw, this is the input capture polarity, but I really don't understand, what is the effect of the encoder mode, I find countless information on the Internet, or can't find convincing yourself, desperate, just to ask is predestined friends the human, in this group of 4, TIM_EncoderMode_TI12, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);

Have a big clear this function after the two parameters in what pull me a hand? To use?