GPIO.IN mode failed, missing file or invalid permissions

[rj...@umich.edu]

Hi, I'm having trouble getting GPIO input on the Beaglebone Black using the Adafruit_BBIO library.

Setting a pin to GPIO.OUT works fine:

debian@beaglebone:~/Desktop$ python -i

Python 2.7.13 (default, Nov 24 2017, 17:33:09)

[GCC 6.3.0 20170516] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import Adafruit_BBIO.GPIO as GPIO

>>>

>>> GPIO.setup("P8_7", GPIO.OUT)

>>> print(GPIO.input("P8_7"))

0

>>> GPIO.output("P8_7", GPIO.HIGH)

>>> print(GPIO.input("P8_7"))

1

>>> exit()

When I try to set the pin to GPIO.IN, it gives the error

ValueError: Set gpio mode failed, missing file or invalid permissions.

debian@beaglebone:~/Desktop$ python -i

Python 2.7.13 (default, Nov 24 2017, 17:33:09)

[GCC 6.3.0 20170516] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import Adafruit_BBIO.GPIO as GPIO

>>>

>>> GPIO.setup("P8_7", GPIO.IN)

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

ValueError: Set gpio mode failed, missing file or invalid permissions.

>>> exit()

How do I read in GPIO input?

This is the output to sudo /opt/scripts/tools/version.sh

debian@beaglebone:~/Desktop$ sudo /opt/scripts/tools/version.sh

[sudo] password for debian:

git:/opt/scripts/:[ea6ea9fca05f36f5044398884375b0231348d6e2]

eeprom:[A335BNLT00C02916BBBK1F31]

model:[TI_AM335x_BeagleBone_Black]

dogtag:[BeagleBoard.org Debian Image 2018-01-28]

bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2018.01-00002-g9aa111a004]

kernel:[4.9.78-ti-r94]

nodejs:[v6.12.3]

uboot_overlay_options:[enable_uboot_overlays=1]

uboot_overlay_options:[uboot_overlay_addr0=/lib/firmware/BB-UART1-00A0.dtbo]

uboot_overlay_options:[uboot_overlay_addr1=/lib/firmware/BB-UART4-00A0.dtbo]

uboot_overlay_options:[enable_uboot_cape_universal=1]

pkg:[bb-cape-overlays]:[4.4.20180126.0-0rcnee0~stretch+20180126]

pkg:[bb-wl18xx-firmware]:[1.20170829-0rcnee2~stretch+20180104]

pkg:[firmware-ti-connectivity]:[20170823-1rcnee0~stretch+20170830]

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]

dmesg | grep pinctrl-single

[    1.385802] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568

END

and dmesg | grep bone

debian@beaglebone:~/Desktop$ dmesg | grep bone

[    0.000000] Kernel command line: console=ttyO0,115200n8 bone_capemgr.enable_partno=BB-UART1,BB-UART4 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet

[    6.620318] systemd[1]: Set hostname to <beaglebone>.

some additional information

debian@beaglebone:~/Desktop$ cat /etc/dogtag

BeagleBoard.org Debian Image 2018-01-28

debian@beaglebone:~/Desktop$ cat /boot/uEnv.txt

#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0

uname_r=4.9.78-ti-r94

#uuid=

#dtb=

###U-Boot Overlays###

###Documentation: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays

###Master Enable

enable_uboot_overlays=1

###

###Overide capes with eeprom

uboot_overlay_addr0=/lib/firmware/BB-UART1-00A0.dtbo

uboot_overlay_addr1=/lib/firmware/BB-UART4-00A0.dtbo

#uboot_overlay_addr2=/lib/firmware/<file2>.dtbo

#uboot_overlay_addr3=/lib/firmware/<file3>.dtbo

###

###Additional custom capes

#uboot_overlay_addr4=/lib/firmware/<file4>.dtbo

#uboot_overlay_addr5=/lib/firmware/<file5>.dtbo

#uboot_overlay_addr6=/lib/firmware/<file6>.dtbo

#uboot_overlay_addr7=/lib/firmware/<file7>.dtbo

###

###Custom Cape

#dtb_overlay=/lib/firmware/<file8>.dtbo

###

###Disable auto loading of virtual capes (emmc/video/wireless/adc)

#disable_uboot_overlay_emmc=1

#disable_uboot_overlay_video=1

#disable_uboot_overlay_audio=1

#disable_uboot_overlay_wireless=1

#disable_uboot_overlay_adc=1

###

###PRUSS OPTIONS

###pru_rproc (4.4.x-ti kernel)

#uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo

###pru_uio (4.4.x-ti & mainline/bone kernel)

#uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo

###

###Cape Universal Enable

enable_uboot_cape_universal=1

###

###Debug: disable uboot autoload of Cape

#disable_uboot_overlay_addr0=1

#disable_uboot_overlay_addr1=1

#disable_uboot_overlay_addr2=1

#disable_uboot_overlay_addr3=1

###

###U-Boot fdt tweaks... (60000 = 384KB)

#uboot_fdt_buffer=0x60000

###U-Boot Overlays###

cmdline=coherent_pool=1M net.ifnames=0 quiet

#In the event of edid real failures, uncomment this next line:

#cmdline=coherent_pool=1M net.ifnames=0 quiet video=HDMI-A-1:1024x768@60e

##Example v3.8.x

#cape_disable=capemgr.disable_partno=

cape_enable=bone_capemgr.enable_partno=BB-UART1,BB-UART4

##Example v4.1.x

#cape_disable=bone_capemgr.disable_partno=

cape_enable=bone_capemgr.enable_partno=BB-UART1,BB-UART4

##enable Generic eMMC Flasher:

##make sure, these tools are installed: dosfstools rsync

#cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3.sh

[Drew Fustini]

please open a GitHub issue and I will try to reproduce this issue:

https://github.com/adafruit/adafruit-beaglebone-io-python/

thanks,
drew

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[rj...@umich.edu]

https://github.com/adafruit/adafruit-beaglebone-io-python/issues/264

[Drew Fustini]

Thanks, I'll take a look.

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