Penta HAT, top fan won't work

#1

I can’t seem to get the pwm for GPIO heads on the rockpi 4 to work. Note, the intent is to run the fan from penta hat, currently no operating and way too hot to be a usable product.
rockpi services won’t run:

Please note I’m running armbian, buster server. I do not wish to deviate to radxa’s older debian

As someone who is not a programmer, it seems to me the issue is with mraa not properly being translated by SWIG. Please help. I’ve been looking into this almost 2 days and I’m about to throw the rockpi 4 at a wall…

services not running
rk3399-bluetooth.service loaded failed failed Bluetooth Rockpi
rng-tools.service loaded active running rng-tools.service
rockpi-penta.service loaded failed failed Rockpi SATA Hat

service data as follows:
rockpi-penta.service - Rockpi SATA Hat
Loaded: loaded (/lib/systemd/system/rockpi-penta.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sat 2020-06-27 21:27:49 -08; 4min 30s ago
Process: 1721 ExecStart=/usr/bin/python3 /usr/bin/rockpi-penta/main.py on (code=exited, status=1/FAILURE)
Main PID: 1721 (code=exited, status=1/FAILURE)

Jun 27 21:27:49 fileserver systemd[1]: rockpi-penta.service: Service RestartSec=100ms expired, scheduling restart.
Jun 27 21:27:49 fileserver systemd[1]: rockpi-penta.service: Scheduled restart job, restart counter is at 5.
Jun 27 21:27:49 fileserver systemd[1]: Stopped Rockpi SATA Hat.
Jun 27 21:27:49 fileserver systemd[1]: rockpi-penta.service: Start request repeated too quickly.
Jun 27 21:27:49 fileserver systemd[1]: rockpi-penta.service: Failed with result ‘exit-code’.
Jun 27 21:27:49 fileserver systemd[1]: Failed to start Rockpi SATA Hat.

system log detail as follows:
un 27 21:27:49 fileserver systemd[1]: rockpi-penta.service: Service RestartSec=100ms expired, scheduling restart.
Jun 27 21:27:49 fileserver systemd[1]: rockpi-penta.service: Scheduled restart job, restart counter is at 4.
Jun 27 21:27:49 fileserver systemd[1]: Stopped Rockpi SATA Hat.
Jun 27 21:27:49 fileserver systemd[1]: Started Rockpi SATA Hat.
Jun 27 21:27:49 fileserver libmraa[1721]: libmraa version v2.0.0-57-gf374a26 initialised by user ‘root’ with EUID 0
Jun 27 21:27:49 fileserver libmraa[1721]: gpio: platform doesn’t support chardev, falling back to sysfs
Jun 27 21:27:49 fileserver libmraa[1721]: libmraa initialised for platform ‘ROCK Pi 4’ of type 20
Jun 27 21:27:49 fileserver libmraa[1721]: pwm_init: pwm0. Failed to open export for writing: No such file or directory
Jun 27 21:27:49 fileserver python3[1721]: Traceback (most recent call last):
Jun 27 21:27:49 fileserver python3[1721]: File “/usr/bin/rockpi-penta/main.py”, line 3, in
Jun 27 21:27:49 fileserver python3[1721]: import fan
Jun 27 21:27:49 fileserver python3[1721]: File “/usr/bin/rockpi-penta/fan.py”, line 6, in
Jun 27 21:27:49 fileserver python3[1721]: pin13 = mraa.Pwm(13)
Jun 27 21:27:49 fileserver python3[1721]: File “/usr/local/lib/python3.7/dist-packages/mraa.py”, line 579, in init
Jun 27 21:27:49 fileserver python3[1721]: this = _mraa.new_Pwm(pin, owner, chipid)
Jun 27 21:27:49 fileserver python3[1721]: ValueError: Error initialising PWM on pin
Jun 27 21:27:49 fileserver systemd[1]: rockpi-penta.service: Main process exited, code=exited, status=1/FAILURE
Jun 27 21:27:49 fileserver systemd[1]: rockpi-penta.service: Failed with result ‘exit-code’.

Testing the PMW code of pwm.py yields the same:
Traceback (most recent call last):
File “./pwm.py”, line 6, in
x = mraa.Pwm(11) # pin11 pwm0
File “/usr/local/lib/python3.7/dist-packages/mraa.py”, line 579, in init
this = _mraa.new_Pwm(pin, owner, chipid)
ValueError: Error initialising PWM on pin

#2

Refer to step 1 here How to install PoE HAT's software on Armbian , both fan use the same pin.

#3

Just completed the poe procedure:
Looks like progress but still no fan movement or oled screen display…

see below output
udo systemctl start rockpi-poe.service
exampler@fileserver:~$ sudo systemctl status rockpi-poe.service
● rockpi-poe.service - Rockpi PoE-FAN
Loaded: loaded (/lib/systemd/system/rockpi-poe.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Sun 2020-06-28 00:09:54 -08; 4s ago
Process: 4700 ExecStart=/usr/bin/python3 /usr/bin/rockpi-poe.py start (code=exited, status=0/SUCCESS)
Process: 4716 ExecStop=/usr/bin/python3 /usr/bin/rockpi-poe.py stop (code=exited, status=0/SUCCESS)
Main PID: 4700 (code=exited, status=0/SUCCESS)

Jun 28 00:09:54 fileserver libmraa[4700]: pwm_init: pwm0. Failed to open export for writing: No such file or directory
Jun 28 00:09:54 fileserver python3[4700]: ‘NoneType’ object has no attribute ‘write’
Jun 28 00:09:54 fileserver python3[4700]: using python3 rockpi-poe.py start|stop|enable
Jun 28 00:09:54 fileserver libmraa[4716]: libmraa version v2.0.0-57-gf374a26 initialised by user ‘root’ with EUID 0
Jun 28 00:09:54 fileserver libmraa[4716]: gpio: platform doesn’t support chardev, falling back to sysfs
Jun 28 00:09:54 fileserver libmraa[4716]: libmraa initialised for platform ‘ROCK Pi 4’ of type 20
Jun 28 00:09:54 fileserver libmraa[4716]: pwm_init: pwm0. Failed to open export for writing: No such file or directory
Jun 28 00:09:54 fileserver python3[4716]: ‘NoneType’ object has no attribute ‘write’
Jun 28 00:09:54 fileserver python3[4716]: using python3 rockpi-poe.py start|stop|enable
Jun 28 00:09:54 fileserver systemd[1]: rockpi-poe.service: Succeeded.

Please note also for reference, not sure if this has to do with it, as a last ditch effort I attempted to install your kernal, currently when I attempt I get the following:
3 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up rockchip-fstab (0.1) …
sed: -e expression #1, char 0: no previous regular expression
mount all partitions
mount: vfat: mount point does not exist.
mount: vfat: mount point does not exist.
mount: vfat: mount point does not exist.
mount: vfat: mount point does not exist.
dpkg: error processing package rockchip-fstab (–configure):
installed rockchip-fstab package post-installation script subprocess returned error exit status 32
Setting up linux-image-4.4.154-95-rockchip-gd2ab1f26e1b3 (4.4.154-95-rockchip) …
update-initramfs: Generating /boot/initrd.img-4.4.154-95-rockchip-gd2ab1f26e1b3
update-initramfs: Converting to u-boot format
Kernel configuration : earlyprintk console=ttyFIQ0,1500000n8 rw init=/sbin/init rootfstype=ext4 rootwait root=PARTUUID=B921B045-1DF0-41C3-AF44-4C6F280D3FAE

Creating new extlinux.conf…
cp: cannot stat ‘/usr/lib/linux-image-5.4.45-rockchip64’: No such file or directory
run-parts: /etc/kernel/postinst.d/zz-update-extlinux exited with return code 1
dpkg: error processing package linux-image-4.4.154-95-rockchip-gd2ab1f26e1b3 (–configure):
installed linux-image-4.4.154-95-rockchip-gd2ab1f26e1b3 package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of linux-4.4-latest:
linux-4.4-latest depends on linux-image-4.4.154-95-rockchip-gd2ab1f26e1b3; however:
Package linux-image-4.4.154-95-rockchip-gd2ab1f26e1b3 is not configured yet.

dpkg: error processing package linux-4.4-latest (–configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
rockchip-fstab
linux-image-4.4.154-95-rockchip-gd2ab1f26e1b3
linux-4.4-latest
E: Sub-process /usr/bin/dpkg returned an error code (1)

#4

For reference, output of rockpi penta service expectedly remains unchanged also also.

#5

Just step 1: Enable hardware resources

#6

lol I remember thinking when I did it I had to reboot, I didn’t which was the problem.
Fan is working :slight_smile: so stoked to see progress thanks.
Next issue: nothing is showing on the oled

#7

This is the same problem, hardware resource not enabled. The oled using I2C-7. If you’re familiar with Armbian you can open it. I will also provide a dtbo later.

#8

Nowhere near familiar enough, not a coder but always keen to learn. Any guidance you could provide to speed up the process would be preferred. I assume I essentially need to write another dtbo as another overlay? Or edit the uncompiled code of the existing one (could you supply?). As I read it I can just uncompile it myself?
It’s my way that I can’t leave a job half done, any further guidance you could provide to assist would be much appreciated.

#9

I uploaded the new dtb and it enabled PWM and I2C:

https://rock.sh/rockpi-penta-dtbo

The failure of RockPi and every other SBC out there
#10

Replace rockpi-poe.dtbo with this rockpi-penta.dtbo, and remember to modify /boot/armbianEnv.txt

#11

Works great, thanks heaps for the prompt assist.

#12

Hey - apologies for necroing this thread, but how would I get the fan working on a Rock Pi 3A running stock Radxa Debian? I have the rk3568-pwm8-m0-fan overlay installed and I’ve tried pins 8, 13, and 33 in fan.py, but none of them can initialize PWM.

#13

Hello smerrill,

It seems that the libmraa of ROCK 3A is not working yet, our colleagues are working on it.

#14

Cool - thanks for the update!