Re: LCD Driver: Smart Panel.

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You're confusing the hardware and software aspects of driving an LCD. In a
normal LCD, the framebuffer is in system memory and data must be written to
the display continously by hardware. In a smart panel, the framebuffer is
inside the panel and there is no need for LCD controller hardware outside
the panel. In both cases, CE just writes to the framebuffer whereever it
happens to be when something needs updated. The operating system is not
writing continously to the LCD panel.


Dean Ramsier - eMVP
BSQUARE Corporation


"Knight Lin" <lhbb5405@xxxxxxxxxxx> wrote in message
news:uYB4hH7gGHA.3996@xxxxxxxxxxxxxxxxxxxxxxx
Hi Steve,
Thanks for your reply. For standard LCD panel, no internal frame
buffer, the controller must deliver frame data out continuously, so do not
care when the frame data is updated. But for smart LCD panel, I think, the
frame data is delivered out only when it is modified, so I need to know
when the frame data is modified. And I think the smart LCD panel can not
be processed as the standard LCD panel continuously refresh mode. So I
want to know when to deliever frame data out to smart LCD panel, does CE
GPE support this mode?


Thnaks.

Knight Lin

"Steve Maillet (eMVP)" <nospam1@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:u1YYx0zfGHA.4172@xxxxxxxxxxxxxxxxxxxxxxx
At each frame updating, which driver entry will be called. Anybody know
it.
None or many depending on what you mean by "frame updating". If you
mean on each frame delivered out the controller to the physical display
then the answer is none, that's done entirely in the hardware controller.
If you mean what function is called whenever the frame buffer is updated
the answer is none and many. No single function is called but any number
of the defined driver functions could be called to update the frame
buffer at any time and, for the most part, in any sequence.



--
Steve Maillet
EmbeddedFusion
www.EmbeddedFusion.com
smaillet at EmbeddedFusion dot com






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