该程序主要应用于步进电机的驱动，是我仿制的，身为初学者，程序可能还很幼稚还请见谅，程序以输出两项正弦波，相位相差90度，还需配合外部电路-The program is mainly used in stepper motor drive is my imitation, as a beginner, the program may still naive but please forgive me, the program to output two sine wave, the phase difference of 90 degrees, with the external circuitry needed