烧写过程有参考泡泡的,不过他使用Jlink,我只有usb2ttl,可是我找不到BOOT0,幸好OPENPILOT有方法,原来板子上的+3.3v和SBL就是烧写开关, How to Flash Bootloaders with USB DFU https://wiki.openpilot.org/display/WIKI/How+to+Flash+Bootloaders+with+USB+DFU How to Flash Bootloaders with an FTDI Cable https://wiki.openpilot.org/display/WIKI/How+to+Flash+Bootloaders+with+an+FTDI+Cable