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stm8使用UART 要设置RX TX的方向寄存器吗
- 2020-07-19
需要的。TX与RX是复用功能的输出与输入。stm8s参考手册（RM0016）中要求复用功能的输入是 floating或者pull-up(For Alternate Function input you should select floating or pull-up input configuration in the DDR and CR1 registers)；复用功能输出就强制把DDR设为1了。（Alternate function outputs provide a direct path from a peripheral to an output or to an I/O pad taking precedence over the port bit in the data output latch register (Px_ODR) and forcing the Px_DDR corresponding bit to 1.）上个类似的帖子，欢迎交流：http://www.stmcu.org.cn/module/forum/forum.php?mod=viewthread&tid=626014&page=1&extra=#pid2514937
