The problem with your UART baudrate may be clock related.

您的UART波特率问题可能是系统时钟造成的.

Depending on the oscillator frequency of the target system and the baudrate which should be used, it might be necessary to change the reload value of a baudrate timer.

根据不同的振荡频率的指标体系和波特率应该使用，也许有必要改变增值的波特率定时器。