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? 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? 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). 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. Again, thank you in advance! On Wednesday, October 9, 2019 at 9:17:50 PM UTC-4, RobertCNelson wrote: > > On Wed, Oct 9, 2019 at 6:02 PM Ralph Stormer <power...@gmail.com > <javascript:>> wrote: > > > > Hi Robert, > > > > From my first post, I mentioned I wanted to utilize pins P8_11 through > P8_19. I don't want to mess with any other pins since the rest of the > LCD_DATA pins (P8_27 through P8_46) are already enabled out of the box. The > default LCD_DATA pins only account for 16 bit color. The other 8 bits are > located on the P8_11 through P8_19 pins in MODE 1 only. I simply want to > switch those specific pins to MODE 1 so that I may utilize the full 24 bit > LCD_DATA. > > Pins P8_27 thru P8_46 are "enabled" as an 16bit color interface thru > the hdmi... You can enable MODE 1 on those other pins but it won't > change a thing as it's configured for 16bit mode... > > If you want 24bit, you need to disable the hdmi interface > > > https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Disable_on-board_devices > > > disable_uboot_overlay_video=1 > > and create your own 24bit overlay or use the example i showed you. > > 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/a7402c96-b061-4e41-800b-df0be1c8aa2c%40googlegroups.com.
