dd Em quarta-feira, 6 de dezembro de 2017 22:20:30 UTC, Mark A. Yoder escreveu: > > 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/ >>> >>
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