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Rockbox mail archiveSubject: RE: Reading from drive?RE: Reading from drive?
From: Nielsen Linus (ext) <"Nielsen>
Date: Wed, 9 Jan 2002 10:14:48 +0100 > Well... Won't re-engineering the code offer any clues? Of course it will. Feel free to do it... :-) > I mean, the research notes indicates that the MPEG outport > port pins are known. Given that, the code has to use them > to make sounds. Yes. Via a 1mbit/s serial interface. > To make sounds, it has to use mp3 data. To get the mp3 data > it has to read the disk... True again. > Given that the CPU has DMA, we might get some details by > checking out how the DMA is controlled and check the code > for DMA activity (assuming they use DMA for at least some > parts of the above). The IDE seems to use plain parallel I/O. The serial line is probably using some kind of DMA, or the CPU would not keep up with the speed of data. Or it may have a huge FIFO which is filled by the CPU once in a while. > Or am I out in the blue again? As always... :-) /Linus Received on 2002-01-09 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |