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USB Host Operation, RTOS and Tiva C Series LaunchPad Board

I've been trying to get USB Host Functionality for the Tiva C LaunchPad Board to function while running under RTOS, but have been having some trouble. I have code that works fine when running outside of RTOS, but cannot enumerate the USB device when running inside of RTOS.

By default the Tiva C LaunchPad board has the following code in the EK_TM4C123GXL . Which basically states that USB Host not supported. Which is not the case for this board or the MCU, so I have been trying to add the support.

/*
 *  ======== EK_TM4C123GXL_initUSB ========
 *  This function just turns on the USB
 */
Void EK_TM4C123GXL_initUSB(EK_TM4C123GXL_USBMode usbMode)
{
    /* Enable the USB peripheral and PLL */
    SysCtlPeripheralEnable(SYSCTL_PERIPH_USB0);
    SysCtlUSBPLLEnable();

    /* Setup pins for USB operation */
    GPIOPinTypeUSBAnalog(GPIO_PORTD_BASE, GPIO_PIN_4 | GPIO_PIN_5);

    if (usbMode == EK_TM4C123GXL_USBHOST) {
        System_abort("USB host not supported\n");
    }
}

I have changed the code to the following to try and provide USB Host Support. 

/*
 *  ======== EK_TM4C123GXL_initUSB ========
 *  This function just turns on the USB
 */
Void EK_TM4C123GXL_initUSB(EK_TM4C123GXL_USBMode usbMode)
{
    /* Enable the USB peripheral and PLL */
    SysCtlPeripheralEnable(SYSCTL_PERIPH_USB0);
    SysCtlUSBPLLEnable();

    /* Setup pins for USB operation */
    GPIOPinTypeUSBAnalog(GPIO_PORTD_BASE, GPIO_PIN_4 | GPIO_PIN_5);

    if (usbMode == EK_TM4C123GXL_USBHOST) {
        
        GPIOPinConfigure(GPIO_PC7_USB0PFLT);  
        GPIOPinConfigure(GPIO_PC6_USB0EPEN);  
				
	GPIOPinTypeUSBAnalog(GPIO_PORTB_BASE, GPIO_PIN_0 | GPIO_PIN_1);	// ID+VBUS
    }
}

Are my settings correct?


The USB Host Driver I am using is one I developed for a CDC ACM device, which functions outside of RTOS. Are there any RTOS specific USB Host considerations I need to take into account? 

Alternatively can someone please verify that RTOS does not support USB host for the board I am using? 
 

Thanks,
Glenn.