Sammy-C21 CAN errors

R3D

Running Duet 3 v3.11 w/ SBC. two tool distribution boards, one populated with 3 Tool1lc boards and the other populated with three Sammy-C21's.

I am attempting to use the Sammy-C21 as an external driver breakout. I have the firmware flashed onto the Sammy (via the ICE) and installed in my printer. I am now trying to commission each of my can connected devices and when I got to the Sammy, I keep receiving an Error: M115: Response timeout: CAN addr 124, req type 6024, RID=37. I have power to the Sammy and it has a blinking green diag light, which it looks like is normal according to the firmware (flashing at 2hz). Curious on what I might be missing.

Any advice on where to begin looking for issues?

Thanks

dc42

Is the green LED on the Sammy blinking in sync with the red LED on the Duet 3 main board?

R3D

No it is not, it is flashing faster.

Thanks,

dc42

In that case, it has failed to establish CAN sync. Check that you have the CAN-H and CAN-L wires the right way round. It's safe to swap them over if you are not sure.

R3D

@dc42 tried every combination. pinned each of the four wires to a separate pin and went through every combination of wires to the sammy. had it wired exactly as you showed in your wiki and had the included jumper on bypass 0_L as shown as well as jumping 0_H, and leaving both off, all with no luck.

Thanks,

dc42

Can you post a photo of how you have wired it?

Which firmware versions are you running on the main board and on the Sammy?

R3D

@dc42 Not sure which version the sammy is running, just used the standard SammyC21-Debug build configuration of the duet 3 expansion project that was linked in the using the Sammy-C21 wiki. the duet 3 is running 3.1.1. Hopefully the pictures aren't too difficult to see how it is wired.

Thanks,

https://docs.google.com/document/d/1Bp4xujc3g4FNgR2rNiLPNwxMCp3kJDNa_W3WrCJcFXg/edit?usp=sharing

R3D

@dc42 Is there somewhere in the source code files that would show the firmware version? or a way to connect to the sammy with the ICE and get it that way? Maybe with a terminal emulator?

Thanks,

A Former User

@R3D you could run strings on the binary f.ex.?

bearer@rama:~/eclipse/firmware/Duet3Expansion$ strings SAMMYC21/Duet3Firmware_SAMMYC21.bin | grep 2020
3.1.0+ (2020-07-01b3)

(might not be the best grep, but it'll work all year..)

JoergS5

@R3D I wonder whether you have changed the frequency for the sammy?

https://forum.duet3d.com/topic/16448/can-fd-generic-io/14

R3D

@JoergS5 Does the sammy default to a different frequency on the CAN bus? I'm assuming I can just change this via M952.

Thanks,

JoergS5

@R3D I don't know the consequences of wrong frequency.

R3D

Also your link to the post states that the bootloader has the clock multiplier changed in it already, which I did flash to the sammy with the ICE prior to uploading firmware...

JoergS5

@R3D ok, then it would be ok.

A Former User

@JoergS5 said in Sammy-C21 CAN errors:

https://forum.duet3d.com/topic/16448/can-fd-generic-io/14

i think that is not relevant when building the SAMMYC21 configuration as dc42 has taken care if it all for us.

R3D

I also loaded the firmware binary through the ICE as well, possibly overwriting the bootloader and thus removing the clock multiplier fix?

If I am following this correctly that is.

Thanks,

A Former User

@R3D said in Sammy-C21 CAN errors:

I also loaded the firmware binary through the ICE as well,

use the SAMMYC21-Debug build config in that case
(edit ref: https://duet3d.dozuki.com/Wiki/Using_the_Sammy-C21_development_board_with_Duet_3#Section_Debugging_your_own_firmware)

R3D

I did, in my previous comments I did specify this.

Thanks,

JoergS5

@R3D maybe you can debug sammy and check can communication. The sammy has a SWD connector (but the pins must be soldered).

R3D

So i have the ICE in the SAMMY with both powered on, I have it connected in atmel studio 7 in the device programming tab, but I am having trouble locating any information regarding the CAN bus.

Any suggestions?

Thanks,