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Warning: limit simultaneous DMAs to 2

Question asked by van_hooft.frank.001 on Jan 14, 2012
Latest reply on Aug 23, 2012 by cleary.stephen
We've been working on this problem with the F2x and F4x for some time, and figure it's about time to warn others about what we've found. You can find the full details here:

http://blog.frankvh.com/2012/01/13/stm32f2xx-stm32f4xx-dma-maximum-transactions/

but in short, you probably should limit the number of simultaneous DMA transfers to 2. We've seen problems with more than 2 active DMAs on both the STM32F2xx and F4xx parts. We've given a testcase to ST and they've confirmed seeing this problem - hopefully they can shed some more light on what's going on.

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