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Saotome
Joined: 03 Apr 2004
Posts: 182
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 Posted: Tue Jul 19, 2005 8:45 pm Post subject: Interleaved DMA transfer from IPU to main memory? |
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I've done some tests yesterday using the IPU to do YUV to RGB conversion. The IPU part works, I send the YUV data and the correct RGB data comes out, but it's not interleaved.
I write 0x00040024 (transfer 4 qw, skip 0x24 qw) to the D_SQWC register, and start the transfer writing 0x108 to the CHCR (channel-3).
Is the interleave mode only for transfers from/to scratchpad? as the ee-manual says "Interleave mode can perform DMA transfer between main memory and scratchpad memory", or is this meant as an example and I'm missing something else?
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EEUG
Joined: 13 May 2005
Posts: 136
Location: The Netherlands
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| Posted: Sun Jul 24, 2005 5:40 pm Post subject: |
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| ...yes, it's only for SP transfers... |
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Saotome
Joined: 03 Apr 2004
Posts: 182
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| Posted: Mon Jul 25, 2005 5:16 am Post subject: |
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I found a solution for the problem. First I transfer the data from IPU to SPR, then interleaved from SPR to main memory; that's still faster than my (not finished) MMI assembler function :)
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