i.MX ProcessorsのトピックCSI data width

CSI data width

BrilliantovKiri — Mon, 20 Aug 2012 11:18:42 GMT

Hello!

In i.MX53 Multimedia Applications Processor Reference Manual, Rev. 2,.1, 6/2012 (p. 3105) I see this:
   1411   Data width. This field defines the number of bits per color.
CSI0_DATA_WIDTH Values:
           0000    4 bits per color
           0000    Reserved
           0001    8 bits per color
           0010    9 bits per color
           0010    Reserved
           0011    10 bits per color
           0100    11 bits per color
           0100    Reserved
           0101    12 bits per color
           0101    Reserved
           0110    13 bits per color
           0110    Reserved
           0111    14 bits per color
           0111    Reserved
           1000    15 bits per color
           1000    Reserved
           1001    16 bits per color

But in linux-2.6.35/include/linux/ipu.h this:
/*!
* Enumeration of CSI data bus widths.
*/
enum {
   IPU_CSI_DATA_WIDTH_4,
   IPU_CSI_DATA_WIDTH_8,
   IPU_CSI_DATA_WIDTH_10,
   IPU_CSI_DATA_WIDTH_16,
};

How can I configure CSI on work e.g. with 16-bit data if I see two difference values?

Thank you and excuse me my bad english.

Re: CSI data width

BrilliantovKiri — Tue, 21 Aug 2012 05:32:03 GMT

Technical support answer: This is for i.MX31 IPU. For i.MX53 this is not used, for i.MX53 correct is Reference Manual.

Re: CSI data width

JimMalone — Tue, 21 Aug 2012 16:04:01 GMT

The table for the CSI_DATA_WIDTH is put together poorly.

Notice that it starts with 4 data bits defined as 0000 and then immediately follows it with Reserved as 0000. All of the entries that are like this are reserved and not yet supported. I have not figured out why the 4 bit option is in the enumeration though.

Also notice that there is no reserved entry following the 8, 10 and 16. I have not tried it yet, but have been assured by Freescale that if you select 1001b you should get 16 bits of data.

Hope this helps.

Jim