AT91SAM9261 VGA

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elidella
Location: Via Virgilio n' 5 Magnago 20020 Milano Italy
Posts: 10
Joined: Fri Jul 13, 2007 10:59 am

AT91SAM9261 VGA

Thu Sep 15, 2011 7:26 am

Hi.
I bought a development board SBC9261-I (Embest) without the LCD "cause I
wanted to use the VGA port with a monitor.

I have compiled several BSP with all possible variants TFTLCD VGA,
but the result is" always zero (the application connects to the Active
Sync), but the screen is always off.

The card works, because with their test module are able to see their logo on screen

I desperately need help wishing I could send email with the
configuration directory. Pbxml

Thank-You
Elio
CptTitanic
Posts: 877
Joined: Sat Oct 30, 2010 6:04 pm

Re: AT91SAM9261 VGA

Thu Sep 15, 2011 9:19 pm

Perhaps you should pursue this directly with Embest?

Stick a scope on the VGA pins and confirm the appropriate signalling, or perhaps find a monitor that expresses signal parameters on the screen, even for what it considers to be illegal modes. Different monitors have different capabilities in this regard, find one with suitable diagnostics will help with experimenting in this area.

Check that the VSYNC/HSYNC have appropriate polarities, and frequencies.

Check it with an older CRT display (support video bandwidths in the 200-300 MHz range), most LCD's are quite inflexible and have very low refresh rates in ~60 Hz, many VGA modes use 85 Hz, most consumer LCD's are typically in the sub 100 MHz bandwidth range.

At the very least get a datasheet for the monitor you're trying to use, or extract the DDC data, or check the supported modes in Windows.

http://martin.hinner.info/vga/timing.html

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