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关于graphProp的一个小问题

Other Parts Discussed in Thread: CONTROLSUITE

    本人在使用ControlSuite里面的一个F28335的永磁电机无位置套件例程(2.1),设定的的频率是标幺值速度是0.2,换算成频率表是40Hz,因为斩波频率是10k,所以应该至少250个中断周期后才能获得一个完整的周期波形,程序中Dlog模块设置的缓存是200个,下图是graph的设置与结果,显示经过了仅仅50个sample就有一个完整的周期这是为何?