Library creation file is used for library creation in Allegro

这是用allegro 3966芯片来驱动两相四线步进电机的电路模块， 原理图和PCB都有，不用修改直接打板就可以，保证可用！-This is allegro 3966 chip to drive the two-phase four-wire stepper motor circuit module, schematics and PCB have, without modification can directly play board to ensure that available!