Hello Jeffery Huang,
Using the same UART interface for UART and LIN communication is not highly recommended, especially to avoid problems within the LIN bus. But, if you want to do this, when you want to change between protocols, you will need to deinitialize the UART1 interface and re-initialize it again with the new configuration. As a safety measure, before deinitializing the UART you will need to ensure that there isn't an ongoing transmission/reception.
Have a great day,
Victor
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