Klipper cannot find rpi mcu - Please help

General Discussion
1

Basic Information:

Printer Model: Ender 5 Plus
MCU / Printerboard: SKR 2
Host / SBC - Rpi 4
klippy.log attached

Describe your issue:

i am adding this incase someone else gets stuck here. After doing

sudo systemctl enable klipper-mcu.service

add these commands

cd ~/klipper/

sudo cp “./scripts/klipper-mcu-start.sh” /etc/init.d/klipper_mcu

sudo update-rc.d klipper_mcu defaults

then proceeded on with the make command e

I cant get the above plans to work. I get the following messages -

pi@Ender3S1:~/klipper sudo cp "./scripts/klipper-mcu-start.sh" /etc/init.d/klipper_mcu cp: cannot stat './scripts/klipper-mcu-start.sh': No such file or directory pi@Ender3S1:~/klipper
pi@Ender3S1:~/klipper sudo cp "./scripts/klipper-mcu-start.sh" /etc/init.d/klipper_mcu cp: cannot stat './scripts/klipper-mcu-start.sh': No such file or directory pi@Ender3S1:~/klipper sudo update-rc.d klipper_mcu defaults
^[[3~update-rc.d: error: unable to read /etc/init.d/klipper_mcu
pi@Ender3S1:~/klipper $

Please help, this is the only instance of klipper I have had problems installing. On an SKR2 board if that helps. Already switched every wire, new Raspberry Pi4, switched to a 3rd Pi4.

At my wits end.
…
klippy (3).log (356.7 KB)

2

Could you please format your code snippets with the Preformatted Text feature of the forum editor. Else important informations get lost.

Format

Did you stick to this?

https://www.klipper3d.org/RPi_microcontroller.html#install-the-rc-script

3 
=======================
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']
Git version: 'v0.12.0-171-g2f6e94c9'
Branch: master
Remote: origin
Tracked URL: https://github.com/Klipper3d/klipper.git
CPU: 4 core ?
Python: '3.9.2 (default, Feb 28 2021, 17:03:44) \n[GCC 10.2.1 20210110]'
webhooks client 547812072224: {'program': 'Moonraker', 'version': 'v0.8.0-327-g9447494'}
=============== Log rollover at Mon Apr 22 00:00:02 2024 ===============
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
mcu 'rpi': Unable to open serial port: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
MCU error during connect
Traceback (most recent call last):
  File "/home/pi/klipper/klippy/mcu.py", line 791, in _mcu_identify
    self._serial.connect_uart(self._serialport, self._baud, rts)
  File "/home/pi/klipper/klippy/serialhdl.py", line 182, in connect_uart
    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 'rpi': 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 'rpi': Unable to connect
Build file /home/pi/klipper/klippy/../.config(3446): Sun Apr 21 15:51:46 2024
========= Last MCU build config =========
CONFIG_LOW_LEVEL_OPTIONS=y
# CONFIG_MACH_AVR is not set
# CONFIG_MACH_ATSAM is not set
# CONFIG_MACH_ATSAMD is not set
# CONFIG_MACH_LPC176X is not set
CONFIG_MACH_STM32=y
# CONFIG_MACH_HC32F460 is not set
# CONFIG_MACH_RP2040 is not set
# CONFIG_MACH_PRU is not set
# CONFIG_MACH_AR100 is not set
# CONFIG_MACH_LINUX is not set
# CONFIG_MACH_SIMU is not set
CONFIG_BOARD_DIRECTORY="stm32"
CONFIG_MCU="stm32g0b1xx"
CONFIG_CLOCK_FREQ=64000000
CONFIG_FLASH_SIZE=0x20000
CONFIG_FLASH_BOOT_ADDRESS=0x8000000
CONFIG_RAM_START=0x20000000
CONFIG_RAM_SIZE=0x24000
CONFIG_STACK_SIZE=512
CONFIG_FLASH_APPLICATION_ADDRESS=0x8002000
CONFIG_STM32_SELECT=y
# CONFIG_MACH_STM32F103 is not set
# CONFIG_MACH_STM32F207 is not set
# CONFIG_MACH_STM32F401 is not set
# CONFIG_MACH_STM32F405 is not set
# CONFIG_MACH_STM32F407 is not set
# CONFIG_MACH_STM32F429 is not set
# CONFIG_MACH_STM32F446 is not set
# CONFIG_MACH_STM32F765 is not set
# CONFIG_MACH_STM32F031 is not set
# CONFIG_MACH_STM32F042 is not set
# CONFIG_MACH_STM32F070 is not set
# CONFIG_MACH_STM32F072 is not set
# CONFIG_MACH_STM32G070 is not set
# CONFIG_MACH_STM32G071 is not set
# CONFIG_MACH_STM32G0B0 is not set
CONFIG_MACH_STM32G0B1=y
# CONFIG_MACH_STM32G431 is not set
# CONFIG_MACH_STM32H723 is not set
# CONFIG_MACH_STM32H743 is not set
# CONFIG_MACH_STM32H750 is not set
# CONFIG_MACH_STM32L412 is not set
# CONFIG_MACH_N32G452 is not set
# CONFIG_MACH_N32G455 is not set
CONFIG_MACH_STM32G0=y
CONFIG_MACH_STM32G0Bx=y
CONFIG_HAVE_STM32_USBFS=y
CONFIG_HAVE_STM32_FDCANBUS=y
CONFIG_HAVE_STM32_USBCANBUS=y
CONFIG_STM32_DFU_ROM_ADDRESS=0
CONFIG_STM32_FLASH_START_2000=y
# CONFIG_STM32_FLASH_START_0000 is not set
CONFIG_STM32_CLOCK_REF_8M=y
# CONFIG_STM32_CLOCK_REF_12M is not set
# CONFIG_STM32_CLOCK_REF_16M is not set
# CONFIG_STM32_CLOCK_REF_20M is not set
# CONFIG_STM32_CLOCK_REF_24M is not set
# CONFIG_STM32_CLOCK_REF_25M is not set
# CONFIG_STM32_CLOCK_REF_INTERNAL is not set
CONFIG_CLOCK_REF_FREQ=8000000
CONFIG_STM32F0_TRIM=16
# CONFIG_STM32_USB_PA11_PA12 is not set
# CONFIG_STM32_SERIAL_USART1 is not set
# CONFIG_STM32_SERIAL_USART1_ALT_PB7_PB6 is not set
# CONFIG_STM32_SERIAL_USART2 is not set
# CONFIG_STM32_SERIAL_USART2_ALT_PD6_PD5 is not set
# CONFIG_STM32_SERIAL_USART3 is not set
# CONFIG_STM32_SERIAL_USART3_ALT_PD9_PD8 is not set
# CONFIG_STM32_SERIAL_USART5 is not set
# CONFIG_STM32_CANBUS_PA11_PA12 is not set
# CONFIG_STM32_CANBUS_PA11_PB9 is not set
# CONFIG_STM32_MMENU_CANBUS_PB8_PB9 is not set
# CONFIG_STM32_MMENU_CANBUS_PB12_PB13 is not set
# CONFIG_STM32_MMENU_CANBUS_PD0_PD1 is not set
CONFIG_STM32_MMENU_CANBUS_PB0_PB1=y
# CONFIG_STM32_MMENU_CANBUS_PD12_PD13 is not set
# CONFIG_STM32_MMENU_CANBUS_PC2_PC3 is not set
# CONFIG_STM32_USBCANBUS_PA11_PA12 is not set
CONFIG_STM32_CANBUS_PB0_PB1=y
CONFIG_USB_VENDOR_ID=0x1d50
CONFIG_USB_DEVICE_ID=0x614e
CONFIG_USB_SERIAL_NUMBER="12345"
CONFIG_WANT_GPIO_BITBANGING=y
CONFIG_WANT_DISPLAYS=y
CONFIG_WANT_SENSORS=y
CONFIG_WANT_LIS2DW=y
CONFIG_WANT_LDC1612=y
CONFIG_WANT_SOFTWARE_I2C=y
CONFIG_WANT_SOFTWARE_SPI=y
CONFIG_NEED_SENSOR_BULK=y
CONFIG_CANSERIAL=y
CONFIG_CANBUS=y
CONFIG_CANBUS_FREQUENCY=250000
CONFIG_CANBUS_FILTER=y
CONFIG_INITIAL_PINS=""
CONFIG_HAVE_GPIO=y
CONFIG_HAVE_GPIO_ADC=y
CONFIG_HAVE_GPIO_SPI=y
CONFIG_HAVE_GPIO_I2C=y
CONFIG_HAVE_GPIO_HARD_PWM=y
CONFIG_HAVE_STRICT_TIMING=y
CONFIG_HAVE_CHIPID=y
CONFIG_HAVE_STEPPER_BOTH_EDGE=y
CONFIG_HAVE_BOOTLOADER_REQUEST=y
CONFIG_INLINE_STEPPER_HACK=y
=======================
Build file /home/pi/klipper/klippy/../out/klipper.dict(8261): Sun Apr 21 15:52:21 2024
Last MCU build version: v0.12.0-169-g28faf814
Last MCU build tools: gcc: (15:8-2019-q3-1+b1) 8.3.1 20190703 (release) [gcc-8-branch revision 273027] binutils: (2.35.2-2+14+b2) 2.35.2
Last MCU build config: ADC_MAX=4095 BUS_PINS_i2c1_PA9_PA10=PA9,PA10 BUS_PINS_i2c1_PB6_PB7=PB6,PB7 BUS_PINS_i2c1_PB8_PB9=PB8,PB9 BUS_PINS_i2c2_PB10_PB11=PB10,PB11 BUS_PINS_i2c2_PB13_PB14=PB13,PB14 BUS_PINS_i2c3_PB3_PB4=PB3,PB4 BUS_PINS_i2c3_PC0_PC1=PC0,PC1 BUS_PINS_spi1=PA6,PA7,PA5 BUS_PINS_spi1a=PB4,PB5,PB3 BUS_PINS_spi2=PB14,PB15,PB13 BUS_PINS_spi2a=PC2,PC3,PB10 BUS_PINS_spi3=PB4,PB5,PB3 CANBUS_FREQUENCY=250000 CLOCK_FREQ=64000000 MCU=stm32g0b1xx PWM_MAX=255 RECEIVE_WINDOW=192 RESERVE_PINS_CAN=PB0,PB1 RESERVE_PINS_crystal=PF0,PF1 STATS_SUMSQ_BASE=256 STEPPER_BOTH_EDGE=1
Build file /home/pi/klipper/klippy/../out/klipper.elf(1076840): Sun Apr 21 15:52:28 2024
Attempting MCU 'mcu' reset command
Attempting MCU 'EBBCan' reset command
Attempting MCU 'rpi' reset
Unhandled exception during post run
Traceback (most recent call last):
  File "/home/pi/klippy-env/lib/python3.9/site-packages/serial/serialposix.py", line 265, in open
    self.fd = os.open(self.portstr, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
FileNotFoundError: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pi/klipper/klippy/klippy.py", line 234, in run
    self.send_event("klippy:firmware_restart")
  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 953, in _firmware_restart
    self._restart_arduino()
  File "/home/pi/klipper/klippy/mcu.py", line 913, in _restart_arduino
    serialhdl.arduino_reset(self._serialport, self._reactor)
  File "/home/pi/klipper/klippy/serialhdl.py", line 379, in arduino_reset
    ser = serial.Serial(serialport, 2400, timeout=0, exclusive=True)
  File "/home/pi/klippy-env/lib/python3.9/site-packages/serial/serialutil.py", line 240, in __init__
    self.open()
  File "/home/pi/klippy-env/lib/python3.9/site-packages/serial/serialposix.py", line 268, in open
    raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg))
serial.serialutil.SerialException: [Errno 2] could not open port /dev/klipper_host_mcu: [Errno 2] No such file or directory: '/dev/klipper_host_mcu'
Restarting printer
Start printer at Mon Apr 22 00:01:52 2024 (1713758512.3 177.1)
===== Config file =====
4

Please attach a new klippy.log to your next post.

Are you sure you did these steps?

1 Like
5

THANK YOU VERY MUCH. After 6 days of trying things, you got it!

1 Like
6

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