On Wed, Oct 21, 2015 at 12:08 PM, <[email protected]> wrote: > I have a BBB running Debian Wheezy, kernel 3.8.13-bone70. I have a 4D > systems LCD cape that I can attach to my system and the LCD cape will start > up and run without any problems. The display datasheet is here. > > I'm trying to make a custom cape using the same display. My custom cape does > not have the LEDs, power, reset, up, down, left, and right buttons, as well > as no EEPROM. I have verified my own schematic comparing the relevant > points, and everything seems to check out. I have also verified that my > display pinout matches the circuit board(s). > > The kernel can be forced to load the cape in the uEnv.txt file. I have > modified this file to load the cape on startup. > > What I'm seeing is as follows: > > After the OS has loaded, the PWM for the display backlight is actually > triggering on the heartbeat. My pins are correct schematically, I've > verified this. The PWM output is actually triggering on the heartbeat, I've > verified this using a multimeter and probing the output from the BBB. Also, > there is no backlight created in the /sys/class/backlight directory. > > After disabling the trigger on the backlight, I just set the backlight to > output the max value. However, nothing is showing up on the screen. > > I have also noticed that the the 4D systems cape actually loads the 00A1 > revision of the overlay, but the uEnv.txt file tries to load the 00A0 > revision. I did not have the 00A0 revision, so I copied the 00A1 file and > re-named it as the 00A0 file. The cape manager accepted this and loaded the > file. Is there some way to specify loading the 00A1 revision?
Use a ":" like: BB-BONE-LCD7-01:00A1 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]. For more options, visit https://groups.google.com/d/optout.
