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I figured the easiest way to do it is to read wav (raw audio) from one of the memory locations (SRAM, EEPROM, etc.), pipe it through the DMA which is triggered (request) by clock signal to DAC: memory-->DMA-->DAC. However when using the DMA Wizard, it asks for two parameters I don't know: 'length' and 'source' in the transaction descriptor. How do I define the source and the length?