DDS(直接数字频率合成器)的整个工程文件,已在板子上运行通过,实现了正弦波、方波、三角波的调幅、调频，尚未实现调相，希望有志同道合者可一同完善！-DDS (direct digital frequency synthesis), the whole project documents, the board has been run through, achieved a sine, square, triangle wave amplitude, frequency, phase modula