Resonance Measurements: mcu ‘rpi’: Unable to open port

General Discussion
1

Trying to setup resonance measurements using accelerometer. Have it all wired up. Installed packages as shown in the instructions but after i copy the following to the printer.cfg i get errors no matter what i’ve tried.

[mcu rpi]
serial: /tmp/klipper_host_mcu

[adxl345]
cs_pin: rpi:None

[resonance_tester]
accel_chip: adxl345
probe_points:
    100,100,20  # an example

its related to the klipper_host_mcu line but i have tried multiple things with no luck. Any suggestions?

I copied the end of the log file. If you need more let me know.
mcu ‘mcu’: Starting serial connect
webhooks client 3042547072: New connection
webhooks client 3042547072: Client info {‘program’: ‘Moonraker’, ‘version’: ‘v0.6.0-156-g3b4bfba’}
Loaded MCU ‘mcu’ 94 commands (v0.9.1-562-gacdad764 / gcc: (15:7-2018-q2-6) 7.3.1 20180622 (release) [ARM/embedded-7-branch revision 261907] binutils: (2.31.1-11+rpi1+11) 2.31.1)
MCU ‘mcu’ config: BUS_PINS_i2c1=PB6,PB7 BUS_PINS_i2c2=PB10,PB11 BUS_PINS_i2c1a=PB8,PB9 RESERVE_PINS_serial=PA10,PA9 BUS_PINS_spi1a=PB4,PB5,PB3 STATS_SUMSQ_BASE=256 RECEIVE_WINDOW=192 STEP_DELAY=2 SERIAL_BAUD=250000 ADC_MAX=4095 BUS_PINS_spi3=PB4,PB5,PB3 BUS_PINS_spi2=PB14,PB15,PB13 BUS_PINS_spi1=PA6,PA7,PA5 PWM_MAX=255 MCU=stm32f103xe CLOCK_FREQ=72000000
mcu ‘rpi’: Starting connect
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
mcu ‘rpi’: Unable to open port: [Errno 2] No such file or directory: ‘/tmp/klipper_host_mcu’
MCU error during connect
Traceback (most recent call last):
File “/home/pi/klipper/klippy/klippy.py”, line 158, in _connect
self.send_event(“klippy:mcu_identify”)
File “/home/pi/klipper/klippy/klippy.py”, line 248, in send_event
return [cb(*params) for cb in self.event_handlers.get(event, [])]
File “/home/pi/klipper/klippy/mcu.py”, line 733, in _mcu_identify
raise error(str(e))
error: mcu ‘rpi’: Unable to connect
Build file /home/pi/klipper/klippy/…/.config(1815): Thu Jun 10 22:05:40 2021

2

You’ve either not copied the rc script to the correct location, or you didn’t run make menuconfig to create the firmware for the “Linux process” followed by make flash.

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

3 Likes
3

Got it working. Thanks Jake. You are very helpful.

1 Like