I'm trying to drive a ili9341 display via the frame buffer, but have hit a snag. There are a number of gpio pins I want to use the are already exported.
bone$ cd */sys/class/gpio/* /sys/class/gpio /sys/devices/platform/ocp bone$ *ls* export gpio116 gpio22 gpio35 gpio46 gpio62 gpio70 gpio78 gpio89 gpio10 gpio117 gpio23 gpio36 gpio47 gpio63 gpio71 gpio79 gpio9 gpio11 gpio12 gpio3 gpio37 gpio48 gpio65 gpio72 gpio8 gpiochip0 gpio110 gpio13 gpio30 gpio38 gpio49 gpio66 gpio73 gpio80 gpiochip32 gpio111 gpio14 gpio31 gpio39 gpio5 gpio67 gpio74 gpio81 gpiochip64 gpio113 gpio15 gpio32 gpio4 gpio50 gpio68 gpio75 gpio86 gpiochip96 gpio114 gpio2 gpio33 gpio44 gpio51 gpio69 gpio76 gpio87 unexport gpio115 gpio20 gpio34 gpio45 gpio60 gpio7 gpio77 gpio88 I can't unexport them. bone$ *echo 115 > unexport* -bash: echo: write error: Invalid argument How do I reclaim these? --Mark bone$ *sudo /opt/scripts/tools/version.sh * git:/opt/scripts/:[29878c8f9a13833ac69956ecc086c95b99726dde] eeprom:[A335BNLTGW1ABBGW16052042] model:[TI_AM335x_BeagleBone_Green_Wireless] dogtag:[BeagleBoard.org Debian Image 2018-07-29] bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 2018.03-00002-gac9cce7c6a]:[location: dd MBR] kernel:[4.14.58-ti-r65] nodejs:[v6.14.3] uboot_overlay_options:[enable_uboot_overlays=1] uboot_overlay_options:[disable_uboot_overlay_video=1] uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo] uboot_overlay_options:[enable_uboot_cape_universal=1] pkg check: to individually upgrade run: [sudo apt install --only-upgrade <pkg>] pkg:[bb-cape-overlays]:[4.4.20180727.0-0rcnee0~stretch+20180727] pkg:[bb-wl18xx-firmware]:[1.20180517-0rcnee0~stretch+20180517] pkg:[kmod]:[23-2rcnee1~stretch+20171005] pkg:[librobotcontrol]:[1.0.0-git20180726.0-0rcnee0~stretch+20180727] pkg:[firmware-ti-connectivity]:[20170823-1rcnee1~stretch+20180328] groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal i2c bluetooth netdev cloud9ide gpio pwm eqep admin spi tisdk weston-launch xenomai] cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet] dmesg | grep pinctrl-single [ 1.046339] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568 dmesg | grep gpio-of-helper [ 1.057509] gpio-of-helper ocp:cape-universal: ready END -- 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/811b4934-1cdc-4961-aed4-0732083e994d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
