Qinheng
CH32F103 chip is a domestic ARM chip launched by Nanjing Qinhang Electronic Products Company, compared with STM32F103 series chips, not only pin and register all compatible, but also enhanced USB function, there are 2 USB, a Host, a Device, but in the flash download algorithm and internal BootLoad There is a difference in compatibility between er and ST. Can not use ST download software, can only use Qinheng official software download, can use serial port and USB two ways,USB way faster, do not need to develop additional BootLoader. In addition, the most prominent is that it is the lowest price of all the chips of its type.