对于ST-link检测stm32 串口出现

Can not connect to target! Please select "Connect Under Reset" mode from Target->Settings menu and try again. If you're trying to connect to a low frequency application , please select a lower SWD Frequency mode from Target->Settings menu.

尝试多次无法解决

后反省

发现是接线口错误

如图所示,vcc3.3v 不接外机可用,遂以记之。

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