VFD的原理设计与驱动实现，其中有硬件原理图和软件部分代码-VFD Principle Design and drive to achieve, including the hardware schematics and software part of the code

详细介绍了vfd 的原理，给出了软件流程和pcb设计技巧-The principle described in detail vfd given software process and pcb design skills