3.2 3HC Bootloader update - No diag led

jay_s_uk

I updated the bootloader on my 3HC following this

[Duet 3 + expansion/tool boards] Expansion and tool boards can now have their bootloaders updated via CAN using the command M997 B# S3 where # is the board address. The bootloader file is Duet3Bootloader-SAME5x.bin for the EXP3HC board, Duet3Bootloader-SAMC21.bin for the other expansion boards by Duet3D, and Duet3Bootloader-SAMMYC21.bin for the Sammy-C21 development board. These files are available at https://github.com/Duet3D/Duet3Bootloader/releases.

M122 B1 showed the bootloader information where previously it didn't.
I then powered down the machine.
Today, I powered on the machine and the 3HC is not responsive.
The diag LED does not illuminate during any point of booting the machine.
Any thoughts?

A Former User

(You might be able to use a raspberry pi's gpio with openocd as an swd programmer to recover if a suitable config file is provided, but don't have a 3hc so i haven't tried it. st-link programmer is another low cost option for swd programming)

jay_s_uk

If i connect to the SWD header, as soon as the board is powered on, the diag LED flashes fast. This is very strange

T3P3Tony

@jay_s_uk said in 3.2 3HC Bootloader update - No diag led:

If i connect to the SWD header, as soon as the board is powered on, the diag LED flashes fast. This is very strange

Hi Jay, what are connecting to the SWD header?

jay_s_uk

@T3P3Tony an ST link. Waiting on a "blue pill" to come so I can hopefully connect to the board properly.

jay_s_uk

But even with just 3.3v and ground attached the diag LED flashes.
With VIN attached, all 4 lights are on but not the diag LED

jay_s_uk

I have a connection between a raspberry pi 4 and the 3HC using openocd
Just setting up the config file.
Does anyone know if this is correct?

init
targets
reset halt
atsame5 bootloader 0
flash erase_sector 0 0 last
reset halt
flash write_image Duet3Bootloader-SAME5x.bin verify
atsame5 bootloader 16384
reset
shutdown

dc42

The bootloader is normally protected, so you will probably need to remove the bootloader protection first. This is in the NVRAM calibration area, see section 9.3 of the SAMC21 datasheet. Caution, do not change any other values in that area.

jay_s_uk

I can read the userspace but I've no idea what bit I should be changing or what I should be changing it to.

jay_s_uk

@dc42 which is the best version of the bootloader to try and flash?
It was the 2.1 bootloader I installed over CAN that caused the board to be none responsive.
Any ideas why it would've happened if its supposed to check itself?
I did try and build the latest version but the build failed.

dc42

Bootloader 2.1 is the latest and is working on all my boards. There are different builds for the SAME5x (i.e. EXP3HC) and SAMC21 (tool board and 1XD).

Were you running in SBC mode or standalone mode when you tried to update the bootloader?

jay_s_uk

I was running in standalone and installed version 2.1 of Duet3Bootloader-SAME5x.bin

dc42

Thanks. I am about to test downgrading and upgrading the bootloader on a 3HC again.

jay_s_uk

my stlinks have come so hopefully a little later i'll be able to use the atmel studio software to make life a little easier

dc42

Downgrading the bootloader over CAN doesn't work, I believe because bootloader versions prior to 2.0 don't have the right CRC. So the firmware refuses to erase the old bootloader and install the new one.

jay_s_uk

@dc42 hmmm, I had whatever bootloader came with the original 3HC and have never updated it prior to this.
Maybe thats the issue?

dc42

I just flashed the very first bootloader release on to the EXP3HC using the ICE, booted up, and verified that the bootloader version was "not available" in M122 B1. Then upgraded successfully to 2.1 over CAN.

So I don't know why your bootloader upgrade failed.

jay_s_uk

ok, thanks
might be back with questions later if I can't get the flashing to work

jay_s_uk

@dc42 would you entertain the idea of me sending you my 3HC for reprogramming? I'm in the UK and would recover the return postage etc

jay_s_uk

@dc42 am i ok to post my 3HC off to you tomorrow? I'm unable to program it here