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DMA and Flow Control

Just a quick question. I'm using an lpc2388 chip and I just wanted to confirm that I cannot use the SSP as the flow controller if I'm using it with DMA. The manual doesn't directly say this but it alludes to it. Also, if we are using the DMA as the flow controller, how does it know how fast to supply the SSP with new data? If I'm running the SSP at 100KHz, what's stopping the DMA from overflowing the SSP fifo?

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