Register an audio signal in real time with a 2d buffer

I'm trying to calculate the position of a sound source using a microphone array. I'm using a blackfin ADSP-bf533 ez kit lite. It features 4 analog input ports (from which I though plugging the microphones into). I know that I need to apply cross-correlation function among the 4 microphone signals.

Documentation supports only the DMA registers configuration and that's all. What do I need to do to implement Ping-Pong buffers method for those signals ?

This is what I have already done:

*pDMA1_PERIPHERAL_MAP = 0x1000;

// Configur DMA1
*pDMA1_CONFIG =0x101B;
*pDMA1_START_ADDR = (void*)iRxBuffer1; // adresa de start
*pDMA1_X_COUNT = 16;
*pDMA1_X_MODIFY = 4; //pentru date pe 32 biti
*pDMA1_Y_COUNT = 4; //numar sub-bufere
*pDMA1_Y_MODIFY = 4;

// Set up DMA2 to transmit
// Map DMA2 to Sport0 TX
*pDMA2_PERIPHERAL_MAP = 0x2000;

// Configure DMA2
*pDMA2_CONFIG = 0x101B ;
*pDMA2_START_ADDR = (void*)iTxBuffer1; // adresa de start
*pDMA2_X_COUNT = 16;
*pDMA2_X_MODIFY = 4; //pentru date pe 32 biti
*pDMA2_Y_COUNT = 4; //numar sub-bufere
*pDMA2_Y_MODIFY = 4;

adsp-bf533

Audio Signal Processors

dma

bf533

buffer

ping-pong

Blackfin Embedded Processors

blackfin

dsp audio

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