UART API UART init

Table 1. UART API uart_init
Routine uart_init
Prototype uint32_t uart_init(UART_HANDLE_T* handle, UART_CONFIG set);
Input parameter handle: The handle to the uart instance. set: configuration for uart operation.
Return Fractional divider value if System clock is not integer multiples of baud rate.
Description Setup baud rate and operation mode for uart, then enable uart.

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