What to do with SKR MINI

[SeanPluemer]

Good evening,

I have been able to complete everything up to actually getting the thing to move.
I chose to use a SKR MINI rather than an Arduino. Kind of regretting this now, since I am unable to figure out why it won't move.

I am able to get access to the GUI and upload a thr file, I can get all the way to playing it. It appears that it is playing, but there is no movement.
I will be trying to learn how this whole code works tomorrow, (thank you, by the way, this is amazing that you are sharing this) and see if I can figure anything out. But in the meantime, is there anything that needs to be changed for use of the SKR MINI v2?

[rdudhagra]

Hi Sean, a few questions to troubleshoot...I assume you’re still using the TMC2209 drivers. If not, there will be more things that you’ll need to change:

1. Did you configure the board by placing the jumpers etc per the YouTube video I linked to in the build guide (https://youtu.be/dOJbSrWVu_Q?t=439)? The TMC2209 drivers are special and will only work if they’re properly wired.
2. You’ll have to modify the marlin arduino code’s configuration to use the SKR MINI V2 instead of the RAMPS board, not sure if you’ve done that yet. I can send pointers on how to do that if you can’t figure it out.
3. Download a software like pronterface onto your computer and try to control the board. Do the motors move at all? Does your computer even connect to the board?
4. If step 3 works, your serial ports on the Pi might be switched/incorrect. Check that the serial port numbers defined in .env do indeed match. You can do this by unplugging everything and running ls /dev/tty*, then plugging in the SKR board and running that command again. There should be one new entry, which is the serial port of the SKR. You can do the same for the LED Strip Arduino as well. (I think I forgot to mention this in the build guide...I’ll put this blurb in there as well to avoid future confusion).

Let me know if those steps help. If not, we might have a more nuanced problem on our hands...keep me posted!

[SeanPluemer]

1. Yes I am plugging it into the same port.
2. I think this might be what the issue is. When I try to home using pronterface it will move for a bit and I get an "[ERROR] Error:Printer halted. kill() called!" I have reviewed the above video and I believe it is set up correctly, but this is a slight issue because I ordered this SKR V2 with the integrated tmc2209's. I believe I saw documentation somewhere that said that no modification was needed except adding the 4 jumpers on the top.
3. I have attached the outputs below.

Systemctl status:

journalctl:

[SeanPluemer]

I found this document that shows how the sensorless homing should be setup for the SKR v2.

[rdudhagra]

Thanks for the updates...yea this document helps a lot. I assume you have those jumpers in place, at least for the X and Y drivers?

[rdudhagra]

The issue is definitely with the homing then, since you got an error when trying to send G28. Have you made any modifications to the marlin firmware I have on my repo, and if so what have you changed? (want to make sure we're on the same page)

If you haven't done already, can you modify my sand-table Marlin firmware in the following ways, upload that to the SKR, and retry G28? (line numbers might be slightly off since I'm pulling these figures from the SKR's official marlin firmware build

1. Configuration.h (line 132) #define MOTHERBOARD BOARD_BTT_SKR_MINI_E3_V2_0
2. Configuration_adv.h (line 2516) #define SENSORLESS_HOMING // StallGuard capable drivers only (should be uncommented, just to confirm)

If this doesn't work, try installing whatever official build of Marlin exists for the SKR (I assume the one from bigtreetech that I linked above). If that ends up working, then all you'll have to do is change the size of your print area and maybe enable more micro stepping, but I can walk you through what to change if you get to that point.

[SeanPluemer]

Hello,
Still no luck, but here is where I am at. I was unable to get your Marlin to work. I am now using this Marlin. I was able to configure it and get everything working using pronterface. I can home, and run GCODE now using pronterface.
Now my issue I can't get the raspberry pi to communicate with it. When I boot up the pi, it does appear to try to home but I don't know if it passes or not.
Feel free to email me at pluemersean@gmail.com if you want to have a bit quicker communication .
I have forked this my repository, I believe this is set up to allow you to view it. Forgive me, a noob with GitHub if not.

[SeanPluemer]

This issue was resolved over the phone. What we did to resolve the issue was do the following:

1. Install the correct Marlin software from here.
2. Enable and tune the sensorless homing.
3. Enable CoreXY mode on Marlin.
4. Modify the home command (when the pi first boots up) to only home the X and Y axis. (for some reason the SKR was getting hung up trying to home a non-existing Z-axis.

[SeanTurner71]

I'm just starting on installing Marlin on a skr mini V2. Was wondering if you could pass along the info that you gave him? Thanks in advance.

[SeanPluemer]

Hello Sean (nice name btw),

So you are going to get to learn to program the SKR!
I think my fork has all the changes you will need.... You can view my Marlin here. So in theory, all you need to do is to download my Marlin and flash it to the board... But it has been a few months and I don't remember tbh.
Here is a video that shows how to flash the board and what to change to enable sensorless homing. https://www.youtube.com/watch?v=0aizXlcQGPA

You can use a software on your laptop called pronterface to make sure that everything works correctly before you even try dealing with the Pi.

The last thing that you will need to change is the raspberry pi setup g28 code.
This can be found at Sand-Table/Website/server/routes/gcode_controller.js linen ~352.
There will be a line that just says "G28" I think all you need to do is change it to "G28 X Y" and that will make ur life

I think that was all I had to do to get it working (other than changing the size of my table). But if not, feel free to msg me!

[SeanTurner71]

Wow. Thanks alot. I'm not a total noob on Marlin but it's been a while and I have moved onto Klipper <https://www.youtube.com/watch?v=3-_EHVw4-qw>. I couldn't get your Marlin to compile for some reason so I just looked through your files and changed the settings into the newer version. I got to see movement using pronterface (which is great) but it's not using corexy for some reason, I defined it in marlin but it's only running one motor at a time. I have some troubleshooting to do I guess. Thanks again for giving me a heads up on the G28 command editing also. Sean Turner

…

On Tue, Jun 22, 2021 at 10:18 AM Sean Pluemer ***@***.***> wrote: Hello Sean (nice name btw), So you are going to get to learn to program the SKR! I *think* my fork has all the changes you will need.... You can view my Marlin here <https://github.com/SeanPluemer/Sand-Table/tree/master/Marlin-2.0.x/Marlin>. So in theory, all you need to do is to download my Marlin and flash it to the board... But it has been a few months and I don't remember tbh. Here is a video that shows how to flash the board and what to change to enable sensorless homing. https://www.youtube.com/watch?v=0aizXlcQGPA You can use a software on your laptop called pronterface to make sure that everything works correctly before you even try dealing with the Pi. The last thing that you will need to change is the raspberry pi setup g28 code. This can be found at Sand-Table/Website/server/routes/gcode_controller.js linen ~352. There will be a line that just says "G28" I think all you need to do is change it to "G28 X Y" and that will make ur life I think that was all I had to do to get it working (other than changing the size of my table). But if not, feel free to msg me! — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#10 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AUSG7TX6IOQGJIVD5VVEVBDTUCLUHANCNFSM4X5TF57A> .

[SeanTurner71]

Since this post I found out what was actually causing my issue so I thought I would update it in case it happened to someone else. It turned out that by leaving the SKR plugged into my PC while powering it on was causing it to fail to boot properly. I keep it plugged in to use pronterface and that was my mistake. When I changed flash cards I just happened to have it unplugged.
Hopefully that will be of help to someone else.

[gabhalling]

Hey guys, I know it's been a while since you worked on this project but I'm attempting to make it now and I'm having some issues you seem to have gone through.

For some reason, VSCode does not seem to be able to compile the Marlin Directory from SeanPluemer (I'm also using the BTT SKR Mini E3 V2. I get this message:

---

RuntimeError: deque mutated during iteration:
File "C:\Users\gabha.platformio\penv\Lib\site-packages\platformio\builder\main.py", line 180:
env.SConscript(env.GetExtraScripts("post"), exports="env")
File "C:\Users\gabha.platformio\packages\tool-scons\scons-local-4.7.0\SCons\Script\SConscript.py", line 612:
return _SConscript(self.fs, *files, **subst_kw)
File "C:\Users\gabha.platformio\packages\tool-scons\scons-local-4.7.0\SCons\Script\SConscript.py", line 279:
exec(compile(scriptdata, scriptname, 'exec'), call_stack[-1].globals)
File "C:\Users\gabha\Downloads\Sand-Table-master\Marlin-2.0.x\buildroot\share\PlatformIO\scripts\STM32F103RC_SKR_MINI.py", line 6:
for define in env['CPPDEFINES']:

---

SeanTurner71 mentionned something about changing the settings to the newer version, but I am unsure on the way to do it.

Any help will be greatly appreciated!

[gabhalling]

In case someone else also ends up in this situation, I ended up starting with the BTT Marlin Build for the SKR Mini E3 V2 (https://github.com/bigtreetech/BIGTREETECH-SKR-mini-E3/tree/master/firmware/V2.0/Marlin-2.0.8.2.x-SKR-mini-E3-V2.0) and modifying values such as serial ports, bed size, enabling CoreXY, sensorless homing and tuning it.

But I was still getting an error (RuntimeError: deque mutated during iteration:) when I tried to compile and I had to follow eoyilmaz's advice that I found here: https://community.platformio.org/t/marlin-runtimeerror-deque-mutated-during-iteration/34661

On to the next step now!

[rdudhagra]

Just checking in here...are you still running into issues with Marlin?

[gabhalling]

As of now, not anymore. Might have to do some tuning for the sensorless homing when I get to it but besides that, I got it to build and flashed the board so that I was able to move the motors.