EK-TM4C1294XL: Sending a simple text with UART5

Hi, I'm trying to use UART5 based on an example available in TIVAWARE examples folder. I just made some modifications on the code in order to use just what I need but I can't see any character in the serial port.

Here is my code :

 #include <stdint.h>
 #include <stdbool.h>
 #include "inc/hw_ints.h"
 #include "inc/hw_memmap.h"
 #include "inc/hw_types.h"
 #include "driverlib/interrupt.h"
 #include "driverlib/pin_map.h"
 #include "driverlib/sysctl.h"
 #include "driverlib/uart.h"
 #include "driverlib/gpio.h"

/*variable to keep system clock*/
uint32_t g_ui32SysClock;

void UARTSend(const uint8_t *pui8Buffer, uint32_t ui32Count)
{
    while(ui32Count--)
    {
        //
        // Write the next character to the UART.
        //
        UARTCharPutNonBlocking(UART5_BASE, *pui8Buffer++);
    }
}



int main(void)
{

    /* Set the clocking to run at 120MHz */
    g_ui32SysClock= SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                        SYSCTL_OSC_MAIN | SYSCTL_USE_PLL |
                        SYSCTL_CFG_VCO_480), 120000000);

    /*Enabling UART and GPIO for UART*/
    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART5);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);

    /*Setting pins for UART functions*/
    GPIOPinConfigure(GPIO_PC6_U5RX);
    GPIOPinConfigure(GPIO_PC7_U5TX);
    GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_6 | GPIO_PIN_7);

    /*Setting UART5 configurations*/
    UARTConfigSetExpClk(UART5_BASE,g_ui32SysClock,19200,
        (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));


    /*task that will repeat forever*/
    while(1){
        UARTSend((uint8_t *)"\033[2JEnter text: ", 16);
    }

	return 0;
}

I'm using a usb to serial convert similar to this one :