Printer Model: Home made
MCU / Printerboard: SKRat + 2x EBB42
Host / Raspberry 3 model B V1.2
klippy (12).log (209.8 KB)
Hi, I have a problem with the CAN bus. If I turn on the printer it is fine and klipper loads. But when I execute “sudo reboot” in the terminal or “host control reboot” in klipper, the CAN bus is not loaded and the MCUs do not communicate.
I’ve been trying for two days now and I can’t figure it out.
Did you do this portion:
https://www.klipper3d.org/CANBUS.html
It is also necessary to configure the host operating system to use the adapter. This is typically done by creating a new file named /etc/network/interfaces.d/can0 with the following contents:
allow-hotplug can0
iface can0 can static
bitrate 1000000
up ifconfig $IFACE txqueuelen 128
Sounds like you’re setting up the can0 interface by hand but haven’t set it up to automatically enable when the Pi restarts
As I wrote above, the CAN bus works when I turn on the printer (raspberry) for the first time. As soon as I “reboot Raspberry” from the HSS terminal - the CAN bus does not load
klippylog at the end it says:
mcu 'mcu': Starting CAN connect
Created a socket
webhooks client 1956802672: New connection
webhooks client 1956802672: Client info {'program': 'Moonraker', 'version': 'v0.8.0-325-g99b97af'}
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
Created a socket
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed
mcu 'mcu': Timeout on connect
MCU error during connect
Traceback (most recent call last):
File "/home/pi/klipper/klippy/mcu.py", line 785, in _mcu_identify
self._serial.connect_canbus(self._serialport, nodeid,
File "/home/pi/klipper/klippy/serialhdl.py", line 133, in connect_canbus
self._error("Unable to connect")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Unable to connect
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/pi/klipper/klippy/klippy.py", line 176, in _connect
self.send_event("klippy:mcu_identify")
File "/home/pi/klipper/klippy/klippy.py", line 263, in send_event
return [cb(*params) for cb in self.event_handlers.get(event, [])]
File "/home/pi/klipper/klippy/klippy.py", line 263, in <listcomp>
return [cb(*params) for cb in self.event_handlers.get(event, [])]
File "/home/pi/klipper/klippy/mcu.py", line 796, in _mcu_identify
raise error(str(e))
mcu.error: mcu 'mcu': Unable to connect
No build file /home/pi/klipper/klippy/../.config
No build file /home/pi/klipper/klippy/../out/klipper.dict
No build file /home/pi/klipper/klippy/../out/klipper.elf
mcu 'mcu': Wait for identify_response
Traceback (most recent call last):
File "/home/pi/klipper/klippy/serialhdl.py", line 68, in _get_identify_data
params = self.send_with_response(msg, 'identify_response')
File "/home/pi/klipper/klippy/serialhdl.py", line 261, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File "/home/pi/klipper/klippy/serialhdl.py", line 318, in get_response
self.serial.raw_send_wait_ack(cmds[-1], minclock, reqclock,
File "/home/pi/klipper/klippy/serialhdl.py", line 253, in raw_send_wait_ack
self._error("Serial connection closed")
File "/home/pi/klipper/klippy/serialhdl.py", line 61, in _error
raise error(self.warn_prefix + (msg % params))
serialhdl.error: mcu 'mcu': Serial connection closed ```Is your main mcu connected via CANbus or USB?
Your config has it as CAN but it’s uuid looks really weird to me.
It’s the one that isn’t connecting as you’ve shown.
The EBB42’s look fine and have a reasonable uuid.
[mcu]
canbus_uuid = 377045208276
I’ve never seen a uuid with just numbers.
yes the [mcu] is connected via CAN and really only has numbers
Please use the preformatted text tag for posting code snippets or console outputs.
This will keep the posts clean and better readable.
Otherwise did you already try the restart_method: command parameter under the MCU sections?
Are all three MCUs connected via can to the SBC?
restart_method: is not a valid config parameter on can nodes
This CAN splitting pcb make thinking a bit hard 
But if I am not mistaken both EBB should be your end device on an idex setup and the U2C is “in the chain”.
Therefore the U2C 120R must be moved to the EBB_L
edit:
With a fast look at the SKRat there is also the posibility to use it as a usbcan-bridge without the need for the U2C in your setup.
Hard to tell, how you connected it. Why don’t you post a schematics?
Compare dmesg output between cold boot and reboot
First off, the connection from the U2C to the main board controller isn’t “CAN”, it’s USB.
When I look at your actual CAN wiring, you could have a problem there. CAN works best if it is wired as a “linear network” like:
You have more of a “star network”:
To be fair, it’s probably not the cause of your issue but you’re not going to have the cleanest signals on your CAN bus. I highly recommend that you wire directly from your U2C to one of your CAN toolheads and then from that toolhead directly to the second one.
Also make sure that you have terminated your toolheads correctly with the U2C and the second toolhead having the 120Ω terminating resistors active. From the appearance of where you’ve put the terminator on the upper CAN device, I suspect that you’re not going to have a crisp signals as you would want.
Hi, the connection from U2C to the motherboard controller is a USB cable, but it is really a CAN bus (BTT documentation).
Yes, from the U2C converter, CAN is handled as a “star” bus and I have both 120R terminating resistors.
As I wrote, when the Raspberry CAN bus is turned on, the communication works, but after “rebooting” the Raspberry, it does not.
I put in the suggestion about the wiring because you may have start up issues with the CAN bus in the star topology.
Then again maybe not. But, in any case, it’s not wired according to CAN bus specifications.
Something I was looking at earlier but might be nothing is your Klipper startup args.
Args: [‘/home/pi/klipper/klippy/klippy.py’, ‘/home/pi/printer_data/config/printer.cfg’, ‘-l’, ‘/home/pi/printer_data/logs/klippy.log’, ‘-I’, ‘/home/pi/printer_data/comms/klippy.serial’, ‘-a’, ‘/home/pi/printer_data/comms/klippy.sock’]
That looks KIAUH generated but is different than mine, I use CAN Bus and don’t have the /comms portion at all. Again, Might be nothing.
Also, I think Myke is right.
Page 22:
Hi, I will test the USB to CAN bus bridge mode with the [mcu] board without the U2C converter and let you know how it turned out.
Hi everyone
looks like some kind of firmware problem on the U2C converter.
Now everything is fine and the CAN bus works even after “rebooting” the Raspberry.
Thanks!
That is wrong!
It is CAN but CANRX/TX instead of CANH/L
edit: The physical socket ist just usb but the protocol is different.
What did you used before? candlelight/budgetcan_fw?
And now klipper usbcan bridge fw?
