Dario Greggio escribi=F3:
> Mauricio Giovagnini wrote:
> =

>> Can you point me to where you read about the timings? That's =

>> the main info I would like to know about.  I read many about =

>> the implementation (everything done) but not about how the =

>> signal is handled.
> =

> Here:
> http://forum.microchip.com/tm.aspx?m=3D199298
> and at http://piccoder.co.uk
> =

> Into the source (interrupt.c file) I cut'n'pasted the timings.
> =

> =

> Horizonal Timing
> =

> Horizonal Dots         640     640     640
> Vertical Scan Lines    350     400     480
> Horiz. Sync Polarity   POS     NEG     NEG
> A (us)                 31.77   31.77   31.77     Scanline time
> B (us)                 3.77    3.77    3.77      Sync pulse lenght
> C (us)                 1.89    1.89    1.89      Back porch
> D (us)                 25.17   25.17   25.17     Active video time
> E (us)                 0.94    0.94    0.94      Front porch
> =

>           ______________________          ________
> ________|        VIDEO         |________| VIDEO (next line)
>      |-C-|----------D-----------|-E-|
> __   ______________________________   ___________
>    |_|                              |_|
>    |B|
>    |---------------A----------------|
> =

> Vertical Timing
> =

> Horizonal Dots         640     640     640
> Vertical Scan Lines    350     400     480
> Vert. Sync Polarity    NEG     POS     NEG
> Vertical Frequency     70Hz    70Hz    60Hz
> O (ms)                 14.27   14.27   16.68     Total frame time
> P (ms)                 0.06    0.06    0.06      Sync length
> Q (ms)                 1.88    1.08    1.02      Back porch
> R (ms)                 11.13   12.72   15.25     Active video time
> S (ms)                 1.2     0.41    0.35      Front porch
> =

>           ______________________          ________
> ________|        VIDEO         |________|  VIDEO (next frame)
>      |-Q-|----------R-----------|-S-|
> __   ______________________________   ___________
>    |_|                              |_|
>    |P|
>    |---------------O----------------|
> =

> 		=

> =

> "VGA industry standard" 640x480 pixel mode
> =

> General characteristics
> =

> Clock frequency 25.175 MHz
> Line  frequency 31469 Hz
> Field frequency 59.94 Hz
> =

> One line
> =

>    8 pixels front porch
>   96 pixels horizontal sync
>   40 pixels back porch
>    8 pixels left border
> 640 pixels video
>    8 pixels right border
> ---
> 800 pixels total per line
> =

> One field
> =

>    2 lines front porch
>    2 lines vertical sync
>   25 lines back porch
>    8 lines top border
> 480 lines video
>    8 lines bottom border
> ---
> 525 lines total per field
> =

> Other details
> =

> Sync polarity: H negative, V negative
> Scan type: non interlaced.
> =


Thanks! I'll take a look.


-- =

------------------------------
Mauricio Giovagnini (Maunix)
www.maunix.com.ar
Cordoba, Arg.
LinkedIn Profile: http://www.linkedin.com/in/mgiovagnini
-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist