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Song Ruo Jing
de878df848
If uart_driver_install is not called before uart_get_baudrate, the UART port may not be ready. In such cases, the register values cannot be read out, leading to a division by zero error in uart_ll_get_baudrate. This commit adds a check to ensure the UART port is enabled before attempting to read its registers. Closes https://github.com/espressif/esp-idf/issues/17513