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Display resolution + VPBE_CLK_CTRL

Jai47484
Prodigy 210 points

Hi, 

Any one can tell me on how to calculate the variable screen informations (fb_var_screeninfo) for a given resolution.

I want to calculate the timing information, (pixclock, hsync_len, vsync_len, margins) for the below resolution.

Half-horizontal 1080p/59.94 (960x1080 active area):

FRAME_START             = Line    1

ACTIVE_VIDEO_START      = Line   42

VERTICAL_BLANKING_START = Line 1122

FRAME_END               = Line 1125

LINE_START (also ACTIVE_VIDEO_START) = Pixel    0

HORIZONTAL_BLANKING_START            = Pixel  960

LINE_END                             = Pixel 1099


Also I want to know how to modify the VPBE Clock Control (VPBE_CLK_CTRL) Register from my application.

Please help..


Thanks in advance,
Jai
  • 0
    TI__Genius 14405 points

    From a HW point of view, there is no general formula here. If you want minimal pixel clock, I would suggest you start with at least 3-5 lines of vertical blanking, and at least 120 pixels of horizontal blanking.

    For the rest of your questions, you need help from our PSP team. Hence I've moved this to the PSP forum