麻烦老师们解释一下下面这段程序：void F281X_EV1_QEP_NO_INDEX_Calc(QEP *p){int32 Tmp;// Check the rotational directionp->DirectionQep = 0x4000&EvaRegs.GPTCONA.all;p->DirectionQep = p->DirectionQep>>14;// Check the timer 2 counter for QE

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