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TMS320F280049C: TIDM-2008 NOTCH滤波器为什么要连续调用两遍

Part Number: TMS320F280049C
Other Parts Discussed in Thread: C2000WARE

案例中电压环对反馈电压执行了NOTCH滤波,我不明白的是为什么要连续调用两次,滤波器的参数都是一样的。例程截图如下:

滤波器参数初始化:

电压环滤波处理:这里电压两次滤波