DMA to GPIO is possible. The GPIO register would be classified as a 'memory' location rather than a 'peripheral' resource. Then the contents can be connected to either another memory or peripheral location. There is a 'bit-banding' feature set available as well which may fit better in certain applications.
NASA's Orion Flight Software Production Systems Manager Darrel G. Raines joins Planet Analog Editor Steve Taranovich and Embedded.com Editor Max Maxfield to talk about embedded flight software used on the Mars on EE Times Radio. Live radio show and live chat. Get your questions ready.