I got the LCD working! But it with using Adafruit's user space LCD interface[1]. I still need a framebuffer solution.
--Mark [1] https://learn.adafruit.com/user-space-spi-tft-python-library-ili9341-2-8 On Tuesday, December 5, 2017 at 7:14:19 PM UTC-5, Mark A. Yoder wrote: > > Well, I though I had a solution. I switched from the 4.9 kernel to 4.4 > bone$ *uname -a* > Linux bone-5eca 4.4.91-ti-r137 #1 SMP Tue Nov 7 01:13:03 UTC 2017 armv7l > GNU/Linux > and I still can't unexport the pins I want for the LCD. > bone$ *sudo bash* > bone# *echo 116 > unexport* > bash: echo: write error: Invalid argument > > I'm not sure what to try next. > > --Mark > > On Wednesday, November 29, 2017 at 9:24:39 PM UTC-5, Yoder, Mark A wrote: >> >> I can't unexport them. >> >> >> root@bone-5eca:/sys/class/gpio# echo 116 > unexport >> bash: echo: write error: Invalid argument >> >> >> --Mark A. Yoder, PhD >> Electrical and Computer Engineering >> Rose-Hulman Institute of Technology >> 812-233-3219 >> ------------------------------ >> *From:* Robert Nelson <[email protected]> >> *Sent:* Wednesday, November 29, 2017 9:22:10 PM >> *To:* Beagle Board; Mark Yoder >> *Subject:* Re: [beagleboard] Is cape manager obsolete? What about device >> tree overlays? >> >> On Wed, Nov 29, 2017 at 8:08 PM, Mark A. Yoder <[email protected]> >> wrote: >> > I see that if I edit /boot/uEnv.txt and comment out: >> > #enable_uboot_cape_universal=1 >> > I can then access all sorts of gpio pins. But now I can't run >> config-pin on >> > them since there is no pinmux entry in /sys/devices/platform/ocp. >> > >> > Is there a way to free up a few gpio pins to drive the LCD and keep the >> rest >> > pinmux-able? >> >> I'm not sure why it's broken now, but you should be able to un-export >> all those pins to drive the LCD, Jason's done it before.. >> >> 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/24ab9c2f-e80c-46d9-979f-741df6855ae9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
