This is so cool Wener!!! On Mon, May 2, 2011 at 5:39 AM, Werner Almesberger <[email protected]> wrote: > After reducing the burst size of the Ben's LCD controller and making > the timer handling more resilient to disturbances, one can also leave > the Ben's LCD running while displaying a VGA image: > > http://downloads.qi-hardware.com/people/werner/ubb/vga/ubb-vga-dual-screen.jpg > > Having the LCD on adds a bit more noise, but it's not too horrible. > > I think 1024x768 will be the highest resolution I can usefully > generate: it seems that most modern monitors expect signals with a > refresh rate of at least 50 Hz. The pixel clock is limited by the > MMC controller to 56 MHz. As the picture shows, this is sufficient > for 1024x768 at 50 Hz, but too slow to reach the next higher step, > 1280x1024. > > It may make sense to go to 1280x480, though. This would look like > 640x480 to the monitor, but it would double the pixel clock, which > would in turn half the amplitude of horizontal noise. > > All my recent development is with the old XEN-1510 monitor. I tried > to output images and more modern and larger monitors and they > didn't like my signals. I made a few improvements since, but I > don't know yet if they're enough to make things work. > > - Werner
Can you place some consolidated info at: http://en.qi-hardware.com/wiki/UBB-VGA Also, I attached this here: http://en.qi-hardware.com/wiki/UBB#Current_Outcomes Have to make sure we get these documented for the outside world if we want some announcements to hit others. Werner, I want to get these cables sometime here, maybe when we speak at FISL in brazil. Any others attending? Any Brazilians on this list? Jon -- Jon Phillips http://rejon.org/ | http://fabricatorz.com/ chat/skype: kidproto | irc: rejon +1.415.830.3884 (global) | +1-510-499-0894 (sf) +86-187-1003-9974 (beijing) _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
