6. This alternate function can be remapped by software to some other port pins (if available on the used package). For more
details, refer to the Alternate function I/O and debug configuration section in the STM32F10xxx reference manual, available
from the STMicroelectronics website: www.st.com.
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STM32F030 的 USARTx_CR2 里面的 SWAP位 可实现这个功能！
直接在参考手册里搜索 swap 就能找到！
details, refer to the Alternate function I/O and debug configuration section in the STM32F10xxx reference manual, available
from the STMicroelectronics website: www.st.com.
是不是说的这个意思？
查了数据手册和用户手册没看到这个功能
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