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STM32F4 external triggered DMA

Question asked by anEngineer on Oct 30, 2014
Latest reply on Nov 7, 2014 by Clive One
We are evaluating the STM32F4 products.

For our current hardware an FPGA will generate measurement values. These values have to be transfered to an external RAM. Both are connected to the STM32 over the bus interface FMC.

The idea was, that the STM32 handles this by using DMA, to copy the measurement values from the FPGA to the RAM by using an DMA Request.

As I understood now, the STM32 only can perform DMA requests for internal hardware, or triggered from the software. Is there no possibility to solve this issue?

We can not generate an interrupt each time measurement values have to be copied, because ist are only a few bytes, but this in a very frequent way. So generating an interrupt would be to much overhead.

I am looking forward for your suggestions...

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