Robert, So I'm not actually connecting an HDMI to the BBB. The EVM is a projector cape that we have sitting ontop of the BBB.
So if nothings plugged in, as you said, it would use a small old framebruffer. So the question is does that old framebruffer have a default resolution with a transfer speed? or can it be adjusted? Michael On Tuesday, March 24, 2020 at 10:04:42 PM UTC-4, RobertCNelson wrote: > > On Tue, Mar 24, 2020 at 8:57 PM Michael Ascenzi <masce...@gmail.com > <javascript:>> wrote: > > > > I'm working with the BBB with the utilization of the DLP2000 EVM cape > from TI. I'm having difficulties with the speed at which I can transfer > 640x320 images across across to the EVM. > > > > One thing that has been asked has to do with the desktop manager and the > image that rendered from the manager. The default resolution of the BBB is > 1920x1080 @24hz. Now obviously we can modify the resolution by using xrandr > to switch up the resolution to 640x480 so that it would run at 60hz. > > > > Part of the software that takes the images and transfer them over the > framebuffer to the EVM is a command to shutdown the desktop manager. If I > don't shutdown the manager, when I send over a frame, there's a chance that > the desktop can insert its own image between the images I'm sending. This > is an issue, as I need the images I'm sending and only those images. > > > > So my question is whats the resolution of the BBB if I disable the > desktop manager? is it still 1920x1080? or is that no longer a factor? > > > > I might be completely off base in my understanding this, I'm guessing > that I am. If i disable the desktop manager, do I still have control over > the screen resolution with xrandr? > > The desktop manager get's the default list of resolutions from the > monitor plugged into the HDMI port. > > You can either, not have anything plugged in, and it'll use a small > old framebufffer default, or override the edid values thru a kernel > boot arg listed in /boot/uEnv.txt... > > Regards, > > -- > Robert Nelson > https://rcn-ee.com/ > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/829a76e3-93b2-4f05-bb4b-f012ba4731e9%40googlegroups.com.
