Function esp_idf_sys::uart_set_tx_idle_num

pub unsafe extern "C" fn uart_set_tx_idle_num(
    uart_num: uart_port_t, 
    idle_num: u16
) -> esp_err_t

@brief Set UART idle interval after tx FIFO is empty

@param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2 @param idle_num idle interval after tx FIFO is empty(unit: the time it takes to send one bit under current baudrate)

@return - ESP_OK Success - ESP_FAIL Parameter error