M8P v2.0 boot loader issue and problems configuring CAN

[Ram-85]

I am having issues configuring CAN BUS with this board, it seems the bootloader is trashed and I unable to flash firmware via sd card

[abo974]

I have same issue. There's different information from EEB Can and M8P config file document ( we have to use Canbus PB0/PB1 or PD0/PD1 ?). I follow the EBB SB2240 guide and now I can't upload any firmware on M8P... and it doesn't work :/

[BobArctor82]

someone have a solution ? same probleme after the ebb sb2240 guide

[abo974]

someone have a solution ? same probleme after the ebb sb2240 guide

You can flash the board without the sd card... Mine work great, except the undervoltage of the TMC2240 :/.
On both the SB2240 and M8P you've to flash Canboot and Klipper, copy the uuid in your printer.cfg. When you flash the board you can't access to the serial port...
I read a lot of tutorial, and you can find some command in the file below. Make sure you have select communication port PD0/PD1 to flash the Manta board and select communication port PB0/PB1 for the SB2240.
flashing_Manta_v2_SB2240.txt

[nero-dv]

I had the same problem. I ended up messing up the bootloader on the M8P, and my CM4 could not see the M8P board when I ran the lsusb command. What I ended up doing was flashing the bootloader available in the repo (link) with dfu-util

1. Press and hold the boot button of M8P and then click the reset button to make M8P boot into DFU mode.
2. While logged into the CM4/CB1, run lsusb to check the MCU's USB-DFU address.
3. Run the following command on the Terminal of CB1/CM4 to write the bootloader to the chip:

sudo dfu-util -d ,0483:df11 -a 0 --dfuse-address 0x8000000:force:mass-erase -D ./M8P_V2_H723_bootloader.bin

After this, I set up the can0 interface:

sudo nano /etc/network/interfaces.d/can0

Add the following:

allow-hotplug can0
iface can0 can static
    bitrate 1000000
    up ifconfig $IFACE txqueuelen 1024

Then I power cycled the device and then logged back in via SSH, then I ran:

cd ~/klipper
make menuconfig

I used the following settings:

[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32H723) --->
Bootloader offset (128KiB bootloader (SKR SE BX v2.0)) --->
Clock Reference (25 MHz crystal) --->
Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->
CAN bus interface (CAN bus (on PD0/PD1)) --->
USB ids --->
(1000000) CAN bus speed
() GPIO pins to set at micro-controller startup (NEW)

Then I ran make, rebooted into DFU mode again, then:

make flash FLASH_DEVICE=0483:df11

After that finished, I reset the MCU by clicking the reset button on the board and verified that the M8P showed a CAN address:

python3 ~/klipper/lib/canboot/flash_can.py -q

After this, I followed a guide on flashing Katapult and Klipper onto the tool-head board I'm using (SB2209 RP2040).

One thing to note is that a lot of guides mention shorting the 120R terminator resistor, but they don't specify that it has to be done on both the Manta and the tool-head PCB.

[Drath1995]

I had the same problem. I ended up messing up the bootloader on the M8P, and my CM4 could not see the M8P board when I ran the lsusb command. What I ended up doing was flashing the bootloader available in the repo (link) with dfu-util

1. Press and hold the boot button of M8P and then click the reset button to make M8P boot into DFU mode.
2. While logged into the CM4/CB1, run lsusb to check the MCU's USB-DFU address.
3. Run the following command on the Terminal of CB1/CM4 to write the bootloader to the chip:

sudo dfu-util -d ,0483:df11 -a 0 --dfuse-address 0x8000000:force:mass-erase -D ./M8P_V2_H723_bootloader.bin

After this, I set up the can0 interface:

sudo nano /etc/network/interfaces.d/can0

Add the following:

allow-hotplug can0
iface can0 can static
    bitrate 1000000
    up ifconfig $IFACE txqueuelen 1024

Then I power cycled the device and then logged back in via SSH, then I ran:

cd ~/klipper
make menuconfig

I used the following settings:

[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32H723) --->
Bootloader offset (128KiB bootloader (SKR SE BX v2.0)) --->
Clock Reference (25 MHz crystal) --->
Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->
CAN bus interface (CAN bus (on PD0/PD1)) --->
USB ids --->
(1000000) CAN bus speed
() GPIO pins to set at micro-controller startup (NEW)

Then I ran make, rebooted into DFU mode again, then:

make flash FLASH_DEVICE=0483:df11

After that finished, I reset the MCU by clicking the reset button on the board and verified that the M8P showed a CAN address:

python3 ~/klipper/lib/canboot/flash_can.py -q

After this, I followed a guide on flashing Katapult and Klipper onto the tool-head board I'm using (SB2209 RP2040).

One thing to note is that a lot of guides mention shorting the 120R terminator resistor, but they don't specify that it has to be done on both the Manta and the tool-head PCB.

Twice now you've saved my bacon with these instructions. I cannot thank you enough, praying theres not a 3rd time, but if there is i've at least download this page and got it backed up in multiple locations

[charchess]

Hi,

you need 2 resistor terminators, no less, no more. One should be on the motherboard and the other on the other side (EBB)

I had issues with that CAN thing and followed https://canbus.esoterical.online which is really comprehensive and got juste the pictures you need. It then worked like a charm, it's really the only guide you need for the CANbus,

hope it'll help