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DMA into GPIO peripherial

Question asked by BeginEnd on Jun 10, 2014
Latest reply on Jun 10, 2014 by Clive One
Hi all,
I have a project where I need to deal with 4-to-8 bit and 8-to-4 bit conversion and so I have a questions:
1. I know that I can do DMA to/from GPIO but what is maximum speed of that operation. Can I go up to 25 or 12.5 mega transactions per sec in any of the low end uC?
2. 8-to-4 bit coding requires D latches with OE, but if I could do the DMA transaction at 25MT/s into GPIO->MODE to set 4 pins of GPIO port into outputs and 4 into inputs and opposite I could do this 8-to-4 bit conversion without external latch. Is this possible using STM32?

Thank you for any help :)