AM3517 - WEC7

Notozman

Team,

Appears to be an issue with Rotating the FB by 90deg when pixel clock is above certain value. Taking the BSP and EVM and testing with DVI - Rotating 640x480x60Hz by 90deg is OK, but at 72Hz it falls over (ie crash-burn). So above 18Mhz seems to be an issue.

Is this a known issue ? It is an issue when using larger LCD's.

over 13 years ago

0 Adeneo Embedded support team over 13 years ago

Mastermind 9310 points

This crash is probably due to high memory bus load that reaches the maximum bandwith. The specific case you mention has never been tried during development but we noticed that high resolutions when choosing DVI output tend to overload the bus. Increasing the pixel clock as you are referring to clearly is a factor that affects the memory bus load generated by the display controller.

This issue is currently filed as "known issue" but may be rather considered as a hardware limitation.

0 Notozman over 13 years ago in reply to Adeneo Embedded support team

TI__Expert 7546 points

Thanks for the response and normally I would agree but in this case it is reportedly OK for WinCE6 but not for WEC7 ? Have you seen this ?

0 Adeneo Embedded support team over 13 years ago in reply to Notozman

Mastermind 9310 points

So you mean the same setup works for you on WinCE6 but not on WEC7? That would indeed imply something broken in the WEC7 BSP. In this case you should be able to diff the graphic driver of WinCE6 against the one in the WEC7 BSP. No big changes should be seen in this area.

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AM3517 - WEC7