After the system is started, how to check which mode UART works in
the UART controller supports both 16450 and 16550 compatible modes. The default mode is 16450 (non-FIFO mode).
please refer to Technical Reference Manual, you should check chapter-38, here’s UART FIFO Control and Interrupt Identification Registers for your reference,
I use uart3 for communicate.When use a PC computer timed transmission more than 5 bytes of data and sends a frequency of 10 Hz, TX2 receives no data or receives a lot of data at once, after a while, the computer crashed.
UART3 TX to RX test is normalI. I checked the TRM manual according to your suggestion and learned that UART is used for Bluetooth, but I don’t know why this problem is.
please refer to pinmux spreadsheets, you may have pin customization if necessary.