Process ADC data, moved by DMA, using CMSIS DSP: what's the right way?

Hi to you all, I've a firmware running on a NXP LPCLink2 (LPC4370: 204 Mhz Cortex M4 MCU) board which basically does this: Fills the ADC FIFO @40msps. Copies the data into memory using the built-in DMA Controller and 2 linked buffers. Processes one