Cannot connect to MCU : Octopus V1.1 + PI 4

[Dickdasty]

Hi guys i'm fighting with a mistake done during installing MMB board for ECRFV 2
I dont know what i've done but now my Voron Trident dont boot : show message mcu 'mcu': Unable to connect.
I followed a lot of guide how to reload klipper on MCU but i a have still issue .

• Voron Trident 300
• Octopus V1.1
• Raspberry PI 4

For to restore Klipper on MCU i try with SD card (128mb only that i've got now) :

• with all harness linked
• try with 24v but firmware.bin does not change in firmware.cur => NOK
• try with power from USB-C (unhooked 24V cable) and installed jumper on 3,3 v (j66) => NOK
• "ls /dev/serial/by-id" => no such file or directory (also for query path)

Try also with DFU Firmware Install

• with all harness linked except for 24V
• Install a jumper between BOOT0 and 3.3V
• Lsusb see device
• procedure ok , make flash FLASH_DEVICE=1234:5678 but "ls /dev/serial/by-id" => no such file or directory (also for query path)

I have I ran out of arrows in my bow!!!

 

[claudermilk]

It's been suggested to unplug everything except power and try flashing that way.

 

[Dickdasty]

It's been suggested to unplug everything except power and try flashing that way.

Hi i'm just resolved now :

And there was light ...! So @ the end : with SD card Nok but in DFU mode following all steps
Power off
add 2 jumpers : boot and USB 5v
Power on and push reset button
lsusb
Bus 001 Device 016: ID 0483:df11 STMicroelectronics STM Device in DFU Mode
cd ~/klipper
make clean
make menuconfig
make
make flash FLASH_DEVICE=0483:df11
Then type in :
ls /dev/serial/by-id This step is important
usb-Klipper_stm32h723xx_320028001651313431393536-if00 => Found !
Fill printer.cfg with value above
[mcu]
serial: /dev/serial/by-id/usb-Klipper_stm32h723xx_320028001651313431393536-if00
Remove jumpers
Power off ....

Now works !!! What i changed : not use Putty but Powershell of Win , unplugged nothing ,only use jumper for boot and usb 5v and then important , not power off before remove jumper .

 

[claudermilk]

Glad you got it sorted. Flashing the controller can sometimes be a pain, fortunately it isn't something that needs to be done very often.