beaglebone black adc "in_voltageX_raw': Resource temporarily unavailable"

Question

I struggle to get readings from analog inputs on the bbb.

cat /sys/bus/iio/devices/iio:device0/in_voltage5_raw cat: '/sys/bus/iio/devices/iio:device0/in_voltage5_raw': Resource temporarily unavailable

cat /etc/dogtag BeagleBoard.org Debian Buster Console Image 2020-05-18

uname -a Linux beaglebone 5.4.38-ti-r8 #1buster SMP PREEMPT Sat May 9 09:53:15 UTC 2020 armv7l GNU/Linux

sudo /opt/scripts/tools/version.sh

git:/opt/scripts/:[029041f6866049997bbfd2c7667b3c6e8c95201c]
eeprom:[A335BNLT000C1716BBBG0543]
model:[TI_AM335x_BeagleBone_Black]
dogtag:[BeagleBoard.org Debian Buster Console Image 2020-05-18]
bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 2019.04-00002-g31a8ae0206]:[location: dd MBR]
bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2019.04-00002-g07d5700e21]:[location: dd MBR]
UBOOT: Booted Device-Tree:[am335x-boneblack-uboot-univ.dts]
UBOOT: Loaded Overlay:[AM335X-PRU-RPROC-4-19-TI-00A0]
UBOOT: Loaded Overlay:[BB-ADC-00A0]
UBOOT: Loaded Overlay:[BB-BONE-eMMC1-01-00A0]
kernel:[5.4.38-ti-r8]
/boot/uEnv.txt Settings:
uboot_overlay_options:[enable_uboot_overlays=1]
uboot_overlay_options:[disable_uboot_overlay_video=1]
uboot_overlay_options:[disable_uboot_overlay_audio=1]
uboot_overlay_options:[disable_uboot_overlay_wireless=1]
uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-19-TI-00A0.dtbo]
uboot_overlay_options:[enable_uboot_cape_universal=1]
pkg check: to individually upgrade run: [sudo apt install --only-upgrade ]
pkg:[bb-cape-overlays]:[4.14.20201119.0-0~buster+20201123]
WARNING:pkg:[bb-wl18xx-firmware]:[NOT_INSTALLED]
pkg:[kmod]:[26-1]
WARNING:pkg:[librobotcontrol]:[NOT_INSTALLED]
pkg:[firmware-ti-connectivity]:[20190717-2rcnee1~buster+20200305]
groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal input bluetooth netdev gpio pwm eqep remoteproc admin spi iio i2c docker tisdk weston-launch xenomai cloud9ide]
cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=100 quiet]
dmesg | grep remote
[   10.849708] remoteproc remoteproc0: wkup_m3 is available
[   11.073021] remoteproc remoteproc1: 4a334000.pru is available
[   11.074751] remoteproc remoteproc2: 4a338000.pru is available
[   11.078998] remoteproc remoteproc0: powering up wkup_m3
[   11.079139] remoteproc remoteproc0: Booting fw image am335x-pm-firmware.elf, size 217168
[   11.083282] remoteproc remoteproc0: remote processor wkup_m3 is now up
dmesg | grep pru
[   11.073021] remoteproc remoteproc1: 4a334000.pru is available
[   11.073193] pru-rproc 4a334000.pru: PRU rproc node /ocp/interconnect@4a000000/segment@0/target-module@300000/pruss@0/pru@34000 probed successfully
[   11.074751] remoteproc remoteproc2: 4a338000.pru is available
[   11.074891] pru-rproc 4a338000.pru: PRU rproc node /ocp/interconnect@4a000000/segment@0/target-module@300000/pruss@0/pru@38000 probed successfully
dmesg | grep pinctrl-single
[    1.762133] pinctrl-single 44e10800.pinmux: 142 pins, size 568
dmesg | grep gpio-of-helper
[    1.776892] gpio-of-helper ocp:cape-universal: ready
END

Anyone an idea?

thanks Ju

user_5554422 · Answer

I think you are using SD Card to boot, right?

...

Well, you have two, different versions of uboot on the SD Card and on the eMMC. The eMMC holds presence over the SD Card for uboot when booting.

If you can and if you do not mind losing the data on your eMMC, you can wipe the eMMC of data or press the S2/Boot button while applying power for about 5 seconds.

Also, I thought the ADC lines on the chip were already powered when booting. I do not think you need the overlay for ADC. Please let me know if this works for you.

beaglebone black adc "in_voltageX_raw': Resource temporarily unavailable"

1 Answers