One connection problem: after the core board is bought back, the pin header needs to be manually soldered to the board. Originally I thought it could be used without soldering and directly by inserting it. In fact, there is no conduction between them(exist some gap which can´t be seen).
核心板买回来后,排针需要和板子人工焊接,我原来以为可以不焊接,直接插进去就可以用,实际它们之间并没有导通.
For the convenience, I use the SW mode instead of the serial port connection to realize the program download, because there exists already a JTAG for stm32 f4 for me.
为了方便，我使用SW连接方式，而不是串口连接模式实现程序下载，因为之前已经有一个JTAG用于stm32 f4
