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This is regarding the 'LPC2148 USB audio example' available in this site. I have some confusions regarding the codes. The endpoint 3(out) is supposed to use DMA here. But in the SOF event callback, data is transferred from EP_RAM to buffer by calling the read endpoint function, similar to slave mode transfer and thus not involving dma. need clarification on this.
I am using the lpc2148. I want to use dma transfer from an external flash memory to an audio codec. please tell me how to go about this. thank u