On Tue, Mar 24, 2020 at 8:57 PM Michael Ascenzi <[email protected]> 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYgC8BYtApnS%2BUL%3DzF6m8h7i_Gj4ZzAov_ycVFQ9JDXdjA%40mail.gmail.com.
