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Multiple DMA requests on one OC

Question asked by Luke on Mar 24, 2016
Latest reply on Mar 24, 2016 by waclawek.jan
On the STM32F303 I am attempting to use a timer OC to trigger two DMA requests - one to output a value on GPIO, and the other to update the CCR value on the timer channel to set the next OC trigger point from a list in memory. Unfortunately it seems that there doesn't appear to be any timer channels that can trigger a request on two different DMA channels simultaneously. I could use an interrupt and update the CCR in code, but timeliness and cycle waste is a large factor due to high frequency on the timer and deadlines that cannot be missed. I suppose I could output the OC signal on a pin and then route it back into an IC then use that as a DMA trigger but I don't like this solution and it wastes pins.

Does anybody have any other ideas for how this could be done in a more elegant way? I am new to the F3, and have mostly worked with F0 devices so there are possibly features I have not considered that are relevant.

Thanks

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