/* This function will enable the USB controller's PLL which is used by it's physical layer. This call is necessary before connecting to any external devices. */
void SysCtlUSBPLLEnable(void)
/* This function will enable the USB controller's PLL which is used by it's physical layer. This call is necessary before connecting to any external devices. */
void SysCtlUSBPLLEnable(void)
{
    HWREG(SYSCTL_RCC2) &= ~SYSCTL_RCC2_USBPWRDN;
}