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LCD rotation and VRFB
Why my LCD rotation must enable VRFB,otherwise LCD rotation fail. but my camera preview does not work when BSP is built with VRFB enabled.
what is the reason?
Why camera preview does not work when the BSP is build with VRFB enabled. How to solve the problem?
I find a passage in the WinCE-BSP ARM-A8 User Guide- “Preview does not work when the BSP 1.x is built with VRFB enabled and if you dont have the CE6 Nov 2010 monthly update installed on your setup. The Nov 2010 CE6 monthly update fixes the stride issue and Preview will work with VRFB enabled after this update is applied.”
where can I downloade "CE6 Nov 2010 monthly update"
Until recently MSFT had all of the updates and rollups post R3 available for download. However it looks like they have pulled all of the older monthly updates and yearly rollups prior to the 2011 Product Update Rollup. Fortunately if you install the following rollup it should include the changes you are looking for.
Windows Embedded CE 6.0 Cumulative Product Update Rollup Package (through 12/31/2011)http://www.microsoft.com/en-us/download/details.aspx?id=28753
Adeneo Embedded Support teamContact us at email@example.com
I has installed Windows Embedded CE 6.0 Cumulative Product Update Rollup Package ,but VRFB is conflicted with camera. why?
The problem you are facing is not actually a software problem but rather a hardware limitation. When VRFB is enabled, some applications require more bus badnwidth to complete an action that they usually require when VRFB is disbaled. In your case, the camera stream probably requests more memory bandwidth than available, which we observe when using high resolution camera streams or selecting DVI with a high resolution display output.
Thank you very much!
Hi,Adeneo Embedded support team
Thank you for your answer, there is a Sentencein your answer-----" we observe when using high resolution camera streams or selecting DVI with a high resolution display output. "，what are the high resolution camera stream and high resotution display? My LCD is 480*800，camera sensor is ov56640. Whether I need to selectc lower resolution camera and LCD?
You might be able to have it work if you choose a low resolution for your camera (it depends on the resolutions supported and exposed by your driver), and as you cannot change your LCD resolution, maybe selecting a lower pixel clock (=> lower refresh rate) will help as well.
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