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As far as I understood, the DMA optimizes the performance by minimizing the Real Time processor use for the data sampling process.
In my application, the data I sample should then be eleborated to calculate the Power Spectra and to extract several information from it. If the processore is busy for data
sampling this kind of operations may be critical.
Consider I don't know yet which kind of information I need, but basically it's all about Spectra interpretation.
That's the reason why I thought DMA FIFO could be a good choise.