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请问TM4C123G QEI定时器的时钟是是系统时钟的几分频啊，利用QEIVelocityGet的返回值计算转数老是有问题 0.0
The input frequency of the QEI inputs may be as high as 1/4 of theprocessor frequency (for example, 20 MHz for a 80-MHz system)
四分之一分频。
