Posting for future reference: libgpiod and python bindings work great, and do not rely on the problematic sysfs support.
Jacek. On Wed, Feb 28, 2018 at 9:45 PM, Jacek Radzikowski < [email protected]> wrote: > Hello, > > I try to access GPIO on pin P9_12 from python script using Adafruit_GPIO > package, the pin is not available for use. Python script complains about > missing file: > > ValueError: Set gpio mode failed, missing file or invalid permissions. > > config-pin does not see it either: > > $ sudo config-pin P9_12 gpio > P9_12 pinmux file not found! > bash: /sys/devices/platform/ocp/ocp*P9_12_pinmux/state: No such file or > directory > Cannot write pinmux file: /sys/devices/platform/ocp/ocp*P9_12_pinmux/state > > What works is exporting GPIO 60 through sys fs, and reading its value from > /sys/class/gpio/gpio60/value > > With cape removed python script and config-pin work as expected. According > to the documentation, the cape does not use this GPIO, so it should not be > reserved. > > Here's output from version.sh: > $ sudo /opt/scripts/tools/version.sh > git:/opt/scripts/:[e307a944e0be0610ff5296e0abe4ad31a6e70daa] > eeprom:[A335BNLTBWA51645BBWG0580] > model:[TI_AM335x_BeagleBone_Black_Wireless] > dogtag:[BeagleBoard.org Debian Image 2017-08-01] > bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot > 2017.07-00002-g61c3ee0fb5]:[location: dd MBR] > kernel:[4.14.21-bone-rt-r13] > nodejs:[v4.8.7] > uboot_overlay_options:[enable_uboot_overlays=1] > uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/ > AM335X-PRU-RPROC-4-4-TI-00A0.dtbo] > uboot_overlay_options:[enable_uboot_cape_universal=1] > pkg:[bb-cape-overlays]:[4.4.20180223.0-0rcnee0~jessie+20180223] > pkg:[bb-wl18xx-firmware]:[1.20170829-0rcnee2~jessie+20180104] > pkg:[firmware-ti-connectivity]:[20170823-1rcnee0~jessie+20170830] > groups:[debian : debian adm kmem dialout cdrom floppy audio dip video > plugdev users systemd-journal netdev i2c bluetooth cloud9ide gpio pwm admin > spi tisdk weston-launch xenomai] > cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 > root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M > net.ifnames=0 quiet] > dmesg | grep pinctrl-single > [ 0.889759] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 > size 568 > dmesg | grep gpio-of-helper > [ 0.890749] gpio-of-helper ocp:cape-universal: ready > END > > > Regards, > Jacek. > > > -- > Given a choice between two theories, take the one which is funnier > -- Given a choice between two theories, take the one which is funnier -- 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/CAA2oDvb4C0LZV%3Dn9R8mYqF9qMM1pinNo3R0Ujvrx4spOZoTWKA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
