Hello,
I have trouble activating the WS281x-LED-Status Plugin on a Raspberry 4B. I only get the error message "code -13 (Unable to initialize SPI)')" in the debug log for the plugin.
The hardware is fine (it worked before a fresh Octoprint install). It also worked before as i mentioned.
What i checked:
Wanted to try GPIO 20 but the plugin did not recognize this pin.
Thanks for any help!
Did you add the option dtoverlay=spi1-3cs to the file /boot/config.txt like it says in the plugin's doc?
Hello Walter,
yes, also had the spi1.* Devices visible in /dev/
But GPIO input got marked red an the logfile showed an output "code -11 (Selected GPIO not possible)')"
Maybe i am missing something very basic in the Raspberry Config, but i don't know what.
Is there a specific reason preventing you from using the default GPIO 10? That is what I am using on both of my Pi4s and it works.
Yes, this error when using PIN 10:
[quote="flankendiskriminator, post:1, topic:60799"]
"code -13 (Unable to initialize SPI)')"[/quote]
This is my working /boot/config.txt. You can compare if you have the same options enabled:
arm_64bit=0
# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details
# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16
# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720
# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4
# uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800
# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18
# Additional overlays and parameters are documented /boot/overlays/README
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Automatically load overlays for detected cameras
camera_auto_detect=1
# Automatically load overlays for detected DSI displays
display_auto_detect=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
# Disable compensation for displays with overscan
disable_overscan=1
[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1
[all]
[pi4]
# Run as fast as firmware / board allows
arm_boost=1
[all]
# enable raspicam
start_x=1
gpu_mem=128
core_freq_min=500
Hey Walter, still the same error (code -13)
Don't know what has changed after reinstalling octoprint, before destroying my old image the torch worked fine.
One more thing that is not in /boot/config.txt is the SPI buffer size. Did you do this?:
spidev.bufsize=32768 to the end of /boot/cmdline.txtBtw. here is my Octopi/OctoPrint version:
Yes, bufsize is set.
OctoPrint version : 1.10.2
OctoPi version : 1.0.0
Python: 3.9.2
Do you have a touchscreen connected to your Pi4 that also uses SPI?
Touchscreen yes, but i guess not SPI, as it is the original RPIO-7LCD.
Well, you can take it off to test and see what happens. 
Same error (-13, Initalizing failed)
OK, found the issue (loaded strandtest.py from the repo of ws281x): My pi user has no permission to access /dev/mem.
Nothing giving access to the user worked, so now Octoprint is running as Root. Not perfect, but at least it works.