现在的程序是使用传统的DDS步进在细分成256份的方法，现在25K的时候波形很不好，经过滤波器后能出很好的三角波 ，调节后波形能成正弦波 不过不纯正-Program now to use the traditional DDS stepping subdivided into 256 parts, 25K when the waveform is very bad, good triangle wave after through the filter, regulation waveform