Change VF50 pixel clock at runtime

Technical Support
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1

Hello,
Is it possible to change the pixel clock frequency of the Colibri VF50 via software at runtime? The change must take effect immediately. A change only at restart is not sufficient. With the PXA300, this was possible at that time via the MapRegLib.

I would be very grateful for a hint on how this works.

With best regards

Olli

2

Yes, it possible. Please check VFxx Reference manual for HW details. Probably you need to change some pixel clock divider register in the LCD controller.

Some registers can be accessed in a Kernel mode only and you will a DataAbort error. Use KernelCallBackLib is this case.