Sundar,
my display is 320x240 and the pixel clock is 6.75MHz.
The following original settings work good but they produce 63 Hz vertical
refresh (too high)
HINT = 407
HSTART = 68
HVALID = 320
VINT = 261
VSTART = 18
VVALID = 240
Please, note that these numbers came directly from the display's datasheet.
Then, following your suggestion I write
desired frame rate = pixel clock/(HINT+1)(VINT+1)
25 = 6750000/(HINT+1)(VINT+1)
So that
(HINT+1)(VINT+1) = 270000
Now, is there a method to define new value for HINT and VINT?
Thanks
Gabriele
Da: sunder ramani [mailto:[email protected]]
Inviato: lunedì 29 dicembre 2008 19.24
A: Gabriele Filosofi; [email protected]
Oggetto: RE: dm644x - How to change PRGB frame rate
Hi,
You should try to increase the blanking period for the output mode and try to
reduce the effective frame rate. Adding more of blanking period into your
horizontal and vertical portions would increase the duration between your
vertical syncs, therbey effectively reducing your frame rate. You should look
into the prgb function in the davinci_platform.c file.
Hope this helps!!!!
Sundar
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