contains bad a bad implementation casting a logical and operation on the DMA interrupt status registers into the IntStatus enumeration type. Because the logical and will result in values != 0 or 1 the function will deliver an invalid return code unless it is called for DMA channel 0 only.
switch (type) {
case GPDMA_STAT_INT:/* check status of DMA channel interrupts */
return (IntStatus) (pGPDMA->INTSTAT & (((1UL << channel) & 0xFF)));
...
should instead be
switch (type) {
case GPDMA_STAT_INT:/* check status of DMA channel interrupts */
return (pGPDMA->INTSTAT & (((1UL << channel) & 0xFF))) ? SET : RESET;
...
