Once the SW I/O is released by the user software, the GPIO controller takes control of these
pins. The reset states of the GPIO control registers put the I/Os in the equivalent states:
• SWDIO: input pull-up
• SWCLK: input pull-down
Having embedded pull-up and pull-down resistors removes the need to add external
resistors.
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pins. The reset states of the GPIO control registers put the I/Os in the equivalent states:
• SWDIO: input pull-up
• SWCLK: input pull-down
Having embedded pull-up and pull-down resistors removes the need to add external
resistors.
F0参考手册，如2楼所说，你需要释放掉SWD功能
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