本PCB文件，是使用Altium designer设计的，是最小系统版，下载支持JTAG和SWD等方式，没有板载外设，仅将所有IO都引出来，非常适合电子设计竞赛和项目应用。-The PCB document is designed to use Altium designer, is the smallest system, download supports JTAG and SWD, etc., there is no on-board peripherals, only the lead out all IO are ideal for electronic design contest and project applications.