that's TivaWare btw, it ships with energia but that's also in CCS
read the comment carefully
"for the function uDMAIntRegister()"
that's obviously not the same as "IntEnable()" ;)
otoh, that does mean that running "IntEnable()" isn't the only thing you do to "enable" an interrupt
it's just 1 of a couple steps
(I've never used the uDMA peripheral so I'm not familiar with what else is necessary, but inspect the uDMA chapter in the TM4C1294NCPDT chip's datasheet carefully to see how it works)