Compiler/CC1350: PIN Multiplexing for different peripherals

Not sure if I understand your question. Could you elaborate some on what you mean by "multiplexing GPIO pins to use it as UART TX and RX."?

Hi,
I'm new to TI-RTOS. Don't have much an idea about Pin enabling for different purpose.

What i meant by GPIO multiplexing is, to use  GPIO Pins like DIO2 for UART TX and DIO3 for UART RX. 

In other controller, we have to call a function to use those pins for a specific purpose (of a peripheral). 

In these examples i found GPIO Pintable, where the UART_RX is defined as 2.

const PIN_Config BoardGpioInitTable[] = {

    CC1350_LAUNCHXL_UART_RX | PIN_INPUT_EN | PIN_PULLDOWN,                                                 /* UART RX via debugger back channel */
    CC1350_LAUNCHXL_UART_TX | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL,                            /* UART TX via debugger back channel */
    PIN_TERMINATE
};

How does the controller know if the 2nd pin is used for UART purpose? And while calling UART_write, the data should be transmitted through 2nd pin. Which we must let the controller know for