The usb_dev_msc doesn't work when DMA functionality for sector transmissions is enabled

[dollop80]

Hi Jon ,
thank you for the tm4c driver with DMA functionality. It really works great.
The only issue I've found that it doesn't work with USB device MSC once the DMA is defines

#define USE_SCATTERGATHER
#define USE_DMA_TX
#define USE_DMA_RX

are enabled. Once the DMA functionality is used the SS0 interrupt does not fire at all
It is easy to reproduce: open the examples\boards\dk-tm4c123g\usb_dev_msc project, replace the mmc-dk-tm4c123g.c with your driver and comment out the line #425 in the usb_dev_msc.c
ROM_uDMAControlBaseSet(&sDMAControlTable[0]);

Will appreciate your help
Thank you