The internal 16M crystal oscillator has too much error, resulting in inaccurate baud rate. 9600bps is OK. If you want to use 115200, use an external crystal oscillator.
In addition, if the data in the data register DR is not removed in time (it may also be due to inaccurate baud rate), data overflow will occur, resulting in repeated interrupts. For example, if there is still data on the serial port when it is paused during debugging, the data in DR will always be a certain data when it runs again, which will not appear under normal circumstances. The solution is to clear the OV flag when entering the interrupt (which cannot solve the fundamental problem).
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