On Thu, Oct 10, 2019 at 4:20 PM Ralph Stormer <powerto...@gmail.com> wrote: > > Hi Robert, > > Once again, thank you for this information. > > I wanted to give you and anyone else in my situation an update on this > matter. I was able to successfully disable the HDMI interface by going into > nano /boot/uEnv.txt and commenting the "disable_uboot_overlay_video=1" line. > > The next thing I looked into was using the 24-bit overlay example mentioned > previously and linked here: > https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-BONE-NH7C-01-A0.dts > > After several hours of research, I discovered that the .dto of this overlay > was already on the BeagleBone Black. I then tried adding this .dto file into > the uEnv.txt file and rebooted the Beagle. I powered it on and tried probing > some of the LCD_DATA pins with an o-scope and didn't get anything. Did I do > something wrong?
IDK, let's find out: sudo /opt/scripts/tools/version.sh > I would also like some help modifying this overlay for other requirements. I > simply only want to unlock the full 24-bit LCD_DATA lines of the Beagle. My > display that I want to connect has a resolution of 640x480. It is not a > touchscreen and I do not need backlight control as I have an external > backlight driver. In this file, I also see display settings such as > fronporch, backporch, hsync, vsync, and clock, which by looking at the > datasheet of my display is 25MHz. How to I get these other values for my > display? Well start with the example and remove things you don't need. You find them in the datasheet of the glass provider. and then you guess... > I understand that once the overlay is written, I use the dtc command to > compile a .dto file, which is then placed somewhere in uEnv.txt (I believe). Or just copy it to: ./src/arm/ and run make from the bb.org-overlays repo > > Lastly, is there anyway to test that the overlay is in place and working? > Until now, I simply connect an o-scope to see signals such as clock. Plug in the lcd? We don't have any simulators. 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/CAOCHtYj2HQ4A916Y0oVgOqmrZO%2BmNUWKPTutiAvg-oNiQKHcTQ%40mail.gmail.com.
