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Altera_Forum's avatar
Altera_Forum
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15 years ago

DMA transfer inside ISR: Problem

Hi everybody, I think this is a common issue, but I didn't find a solution to my question, so hopefully I will get an answer here: I have a DMA controller which I want to use on an IRQ com...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I would set some flag inside the ISR and call up the DMA from outside the ISR based on this flag. Interrupts should be short and by placing a DMA transfer call inside of it there are a lot of things that could go wrong (too many to list). I suspect interrupts are masked while you are in the PIO ISR and that's why you don't see the DMA IRQ fire (it fires but nobody is listening).