Problems in beaglebone black GPIO configration

Hardware
1

HI ,I have a beaglebone black board and I want to control P9_15(GPIO48) outputing high or low levels by Johnny5 . I am a new user of beaglebone black board and Node-RED, there are some problems in configuring gpio out node of Johnny5. My current flow is simple as follows:

[{"id":"f5e61d75.93bc1","type":"tab","label":"Flow1","disabled":false,"info":""},{"id":"5aada02c.0fd5","type":"inject","z":"f5e61d75.93bc1","name":"ON","topic":"x","payload":"1","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":290,"y":180,"wires":[["4a75b5cb.32488c"]]},{"id":"4a75b5cb.32488c","type":"gpio out","z":"f5e61d75.93bc1","name":"P9-15","state":"OUTPUT","pin":"48","i2cDelay":"0","i2cAddress":"","i2cRegister":"","outputs":0,"board":"cc553fd0.3e82a","x":510,"y":200,"wires":[]},{"id":"6551b710.a6e528","type":"inject","z":"f5e61d75.93bc1","name":"OFF","topic":"x","payload":"0","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":290,"y":240,"wires":[["4a75b5cb.32488c"]]},{"id":"cc553fd0.3e82a","type":"ioplugin","z":"","name":"","username":"","password":"","boardType":"beaglebone-io","serialportName":"","connectionType":"local","mqttServer":"","pubTopic":"","subTopic":"","tcpHost":"","tcpPort":"","sparkId":"","sparkToken":"","beanId":"","impId":"","uuid":"","token":"","sendUuid":"","samplingInterval":"100"}]

I don’t sure how to configure gpio out node of Johnny5. When I edit gpio out node of Johnny5, there have some Properties need to be configured including Pin parameter. At first, I thought the Pin parameter should be filled with the 48 (number format). But after deployment, I clickd on the inject ON node and found an error message in the system as follows: msg : error."TypeError: Cannot read property 'index' of undefined".

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So, I changed the Pin parameter to P9_15 and GPIO_48 (symbol format). But after deployment, the following error message appeared when clicking on inject ON node: msg : error "Error: EACCES: permission denied, open '/sys/devices/platform/ocp/ocp:P9_15_pinmux/state'".
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I think this problem should not be caused by inject ON node. it should be caused by a GPIO configuration error.but I don’t know how to correct. I hope someone can help me solve this problem, because if I can't control GPIO, then I can't control external devices. Here I express my gratitude in advance to those who can help me.

2

Hi @lpj669 ,

Two things to check, first let's make sure you have the latest pre-packaged version of bb-node-red-installer for the beagleboard. As back in September we update this package to utilze the 'gpio' group for i/o permission..

debian@bbb-pwr01-ser09:~$ dpkg --list | grep bb-node
ii  bb-node-red-installer                  1.2.9-0rcnee0~buster+20210205              armhf        Node-RED installer for beagleboard.org

Finally, let's double check that u-boot isn't blocking anything:

sudo /opt/scripts/tools/version.sh

Regards,

3

Hi

my user (debian) seem to be in groups
debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal bluetooth netdev i2c cloud9ide xenomai weston-launch tisdk docker iio spi admin remoteproc eqep pwm gpio

but I get an error I think we saw before

"Error: ENOENT: no such file or directory, open 
'/sys/devices/platform/ocp/ocp:P8_11_pinmux/state'"

and indeed none of the pins are mentioned in that directory
the only ones there are

drwxrwxr-x 3 root gpio    0 Feb  7 11:27 ocp:cape-universal
drwxr-xr-x 6 root root    0 Jan  1  2000 ocp:l4_wkup@44c00000
drwxrwxr-x 3 root gpio    0 Feb  7 11:27 ocp:P9_19_pinmux
drwxrwxr-x 3 root gpio    0 Feb  7 11:27 ocp:P9_20_pinmux
4

Hi @dceejay , node-red does not run as a normal user, instead:

debian@bbb-pwr01-ser09:~$ cat /lib/systemd/system/nodered.service | grep 'User\|Group'
User=node-red
Group=node-red

debian@bbb-pwr01-ser09:~$ cat /etc/group | grep gpio
gpio:x:999:debian,node-red

cape universal isn't.enabled, please also run:

sudo /opt/scripts/tools/version.sh

Regards,

5 
sudo /opt/scripts/tools/version.sh
[sudo] password for debian: 
git:/opt/scripts/:[b39ec679648a6be8f25f48bd1c9784c1fc5a0c46]
eeprom:[A335BNLT0A5A1813BBBK5069]
model:[TI_AM335x_BeagleBone_Black]
dogtag:[BeagleBoard.org Debian Buster IoT Image 2020-04-06]
bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 2019.04-00002-g07d5700e21]:[location: dd MBR]
bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2017.09-00002-g0f3f1c7907]:[location: dd MBR]
UBOOT: Booted Device-Tree:[am335x-boneblack-uboot.dts]
UBOOT: Loaded Overlay:[AM335X-20-00A0]
UBOOT: Loaded Overlay:[AM335X-PRU-RPROC-4-19-TI-00A0]
UBOOT: Loaded Overlay:[BB-ADC-00A0]
UBOOT: Loaded Overlay:[BB-BONE-eMMC1-01-00A0]
UBOOT: Loaded Overlay:[BB-HDMI-TDA998x-00A0]
kernel:[4.19.94-ti-r42]
nodejs:[v10.23.1]
/boot/uEnv.txt Settings:
uboot_overlay_options:[enable_uboot_overlays=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>]
pkg:[bb-cape-overlays]:[4.14.20201221.0-0~buster+20201221]
pkg:[bb-wl18xx-firmware]:[1.20200813.1-0~buster+20200813]
pkg:[kmod]:[26-1]
pkg:[librobotcontrol]:[1.0.5-git20200715.0-0~buster+20200716]
pkg:[firmware-ti-connectivity]:[20190717-2rcnee1~buster+20200305]
groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal bluetooth netdev i2c gpio pwm eqep remoteproc admin spi iio docker tisdk weston-launch xenomai cloud9ide]
cmdline:[console=ttyO0,115200n8 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=100 quiet]
dmesg | grep remote
[   46.706778] remoteproc remoteproc0: wkup_m3 is available
[   46.891722] remoteproc remoteproc0: powering up wkup_m3
[   46.891760] remoteproc remoteproc0: Booting fw image am335x-pm-firmware.elf, size 217168
[   46.892058] remoteproc remoteproc0: remote processor wkup_m3 is now up
[   51.663327] remoteproc remoteproc1: 4a334000.pru is available
[   51.695711] remoteproc remoteproc2: 4a338000.pru is available
dmesg | grep pru
[   51.663327] remoteproc remoteproc1: 4a334000.pru is available
[   51.667193] pru-rproc 4a334000.pru: PRU rproc node pru@4a334000 probed successfully
[   51.695711] remoteproc remoteproc2: 4a338000.pru is available
[   51.695871] pru-rproc 4a338000.pru: PRU rproc node pru@4a338000 probed successfully
dmesg | grep pinctrl-single
[    0.852700] pinctrl-single 44e10800.pinmux: 142 pins, size 568
dmesg | grep gpio-of-helper
[    0.854363] gpio-of-helper ocp:cape-universal: ready
lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
END
6

Hi I have upgraded Node-RED and Node.js using the built-in upgrade tool:

sudo apt update
sudo apt upgrade nodejs bb-node-red-installer

I got some informations as follows:

root@beaglebone:/# dpkg --list | grep bb-node
ii  bb-node-red-installer                     1.2.9-0rcnee0~buster+20210205                  armhf        Node-RED installer for beagleboard.org

root@beaglebone:/# sudo /opt/scripts/tools/version.sh
git:/opt/scripts/:[b39ec679648a6be8f25f48bd1c9784c1fc5a0c46]
eeprom:[A335BNLT00C00719BBBK0F0C]
model:[TI_AM335x_BeagleBone_Black]
dogtag:[BeagleBoard.org Debian Buster IoT Image 2020-04-06]
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]
UBOOT: Loaded Overlay:[BB-HDMI-TDA998x-00A0]
kernel:[4.19.94-ti-r42]
nodejs:[v10.23.1]
/boot/uEnv.txt Settings:
uboot_overlay_options:[enable_uboot_overlays=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>]
pkg:[bb-cape-overlays]:[4.14.20201221.0-0~buster+20201221]
pkg:[bb-wl18xx-firmware]:[1.20200813.1-0~buster+20200813]
pkg:[kmod]:[26-1]
pkg:[librobotcontrol]:[1.0.5-git20200715.0-0~buster+20200716]
pkg:[firmware-ti-connectivity]:[20190717-2rcnee1~buster+20200305]
groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal bluetooth netdev i2c gpio pwm eqep remoteproc admin spi iio docker tisdk weston-launch xenomai cloud9ide]
cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=100 quiet]
dmesg | grep remote
[   66.543539] remoteproc remoteproc0: wkup_m3 is available
[   66.636059] remoteproc remoteproc0: powering up wkup_m3
[   66.636088] remoteproc remoteproc0: Booting fw image am335x-pm-firmware.elf, size 217168
[   66.636342] remoteproc remoteproc0: remote processor wkup_m3 is now up
[   69.375670] remoteproc remoteproc1: 4a334000.pru is available
[   69.385572] remoteproc remoteproc2: 4a338000.pru is available
dmesg | grep pru
[   69.375670] remoteproc remoteproc1: 4a334000.pru is available
[   69.375833] pru-rproc 4a334000.pru: PRU rproc node pru@4a334000 probed successfully
[   69.385572] remoteproc remoteproc2: 4a338000.pru is available
[   69.385755] pru-rproc 4a338000.pru: PRU rproc node pru@4a338000 probed successfully
dmesg | grep pinctrl-single
[    0.949774] pinctrl-single 44e10800.pinmux: 142 pins, size 568
dmesg | grep gpio-of-helper
[    0.962987] gpio-of-helper ocp:cape-universal: ready
lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
END

the GPIO of beaglebone can be controled well and the LED can be on and off.

image
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but I found that the*. node-red* directory seems to have changed. It doesn't seem to be in the root directory.isn't it?

7

So the base application and (application specific version of node) are under "/opt/node-red/" which get's overwritten on every install/upgrade.

The user home for node-red, is under /var/lib/node-red/ where your .config and .node-red directories are stored.

The node-red application runs as: user/group: node-red/node-red

Previously, node-red was installed under /usr/local/lib/node_modules/, but i had to disconnect it from the default version of node in Debian. (we have other userspace node applications that haven't been updated for later node versions..)

Regards,

8

Having an old verison of u-boot in the eMMC makes this a fun thing to debug.. Get them both to v2019.04 and then you won't have to remember to hold down the 'user' boot to make sure the microSD boots..

Regards,

9

Ah. How do I do that ? Thanks

10

Remove the microSD, all the eMMC ot bootup..

Then run:

debian@beaglebone:~$ cd /opt/scripts/tools/developers/
debian@beaglebone:/opt/scripts/tools/developers$ git pull
debian@beaglebone:/opt/scripts/tools/developers$ sudo ./update_bootloader.sh
debian@beaglebone:/opt/scripts/tools/developers$ sudo reboot

Next, stick microSD back in, let it boot up, then run:

debian@beaglebone:~$ cd /opt/scripts/tools/developers/
debian@beaglebone:/opt/scripts/tools/developers$ git pull
debian@beaglebone:/opt/scripts/tools/developers$ sudo ./update_bootloader.sh
debian@beaglebone:/opt/scripts/tools/developers$ sudo reboot

both will the be the latest..

Regards,

11

Hi,

If I boot without sd card I just get 4 blue LED - and can't login. (I don't have a screen so can't see what's happening) . If I boot with sd card I can run script above.
I then ran a full upgrade to get latest bb-nodered-installer and rebooted - and finally the pins all seem to have appeared. Phew. Thanks

12

Thank everyone very much for your help

13

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