user keyboard input via uart usb port

yes i'm using arm cortex m3 lm3s811 with usb port that also supports data stream through uart, default code for it is given as
int
main(void)
{ // Set the clocking to run directly from the crystal. SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ);

// Initialize the OLED display and write status. OSRAMInit(false); OSRAMStringDraw("UART echo: UART0", 0, 0); OSRAMStringDraw("115,200, 8-N-1", 6, 1);

// Enable the peripherals used by this example. SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0); SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

// Enable processor interrupts. IntMasterEnable();

// Set GPIO A0 and A1 as UART pins. GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

// Configure the UART for 115,200, 8-N-1 operation. UARTConfigSet(UART0_BASE, 115200, (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));

// Enable the UART interrupt. //IntEnable(INT_UART0); //UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);

// Prompt for text to be entered. // UARTSend((unsigned char *)"Enter text: ", 12); // UARTSend((unsigned char *) "def", 12);

// Enable the UART. UARTEnable(UART0_BASE);

// Check for characters. This will spin here until a character is placed // into the receive FIFO. //while(!UARTCharsAvail(UART0_BASE)) //{ //}

// Get the character(s) in the receive FIFO. //while(UARTCharNonBlockingGet(UART0_BASE)) //{ //} // I have to comment out those lines, because it goes into infinite loops.

// Put a character in the output buffer. // is the character 'c' being written to the UART? or is it in the buffer? do I need to enable FIFO buffers?

// Disable the UART. // Loop forever echoing data through the UART. while(1) {

}
}
while searching on internet if found charput and charget functions but don't know how to use it in my code

yes i'm using arm cortex m3 lm3s811 with usb port that also supports data stream through uart, default code for it is given as
int
main(void)
{ // Set the clocking to run directly from the crystal. SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ);

// Initialize the OLED display and write status. OSRAMInit(false); OSRAMStringDraw("UART echo: UART0", 0, 0); OSRAMStringDraw("115,200, 8-N-1", 6, 1);

// Enable the peripherals used by this example. SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0); SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

// Enable processor interrupts. IntMasterEnable();

// Set GPIO A0 and A1 as UART pins. GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

// Configure the UART for 115,200, 8-N-1 operation. UARTConfigSet(UART0_BASE, 115200, (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));

// Enable the UART interrupt. //IntEnable(INT_UART0); //UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);

// Prompt for text to be entered. // UARTSend((unsigned char *)"Enter text: ", 12); // UARTSend((unsigned char *) "def", 12);

// Enable the UART. UARTEnable(UART0_BASE);

// Check for characters. This will spin here until a character is placed // into the receive FIFO. //while(!UARTCharsAvail(UART0_BASE)) //{ //}

// Get the character(s) in the receive FIFO. //while(UARTCharNonBlockingGet(UART0_BASE)) //{ //} // I have to comment out those lines, because it goes into infinite loops.

// Put a character in the output buffer. // is the character 'c' being written to the UART? or is it in the buffer? do I need to enable FIFO buffers?

// Disable the UART. // Loop forever echoing data through the UART. while(1) {

}
}
while searching on internet if found charput and charget functions but don't know how to use it in my code