[BUG] Sovol SV06 boot loop with SPEAKER

[mlewis-everley]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

As I reported in issue #26961, My SV06's crash when trying to boot using Any stock branch of Marlin 2.1.x (including bugfix-2.1.x).

After a lot of mucking around, I have found that the issue is the BEEPER_PIN definition in: https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.1.x/Marlin/src/pins/stm32f1/pins_CREALITY_V4.h#L241

Disabling the beeper (BEEPER_PIN -1) allows the printer to boot, and it functions normally, but the speaker is really useful for flagging things such as filament runout/change/etc.

I have also looked around some of the other issues here, I can see that in #25868 (and the warning during compilation) that Maple environments are depreciated, but there is no non Maple alternative for the SV06?

I also spotted issue #20646 which outlines the need to an additional board on the Ender 3 Pro (similar but also different issue).

Finally, I am aware of PR: #25864 , but this is for the SV06 plus touchscreen.

Are there any solutions/possible fixes for the stock SV06? Is it an issue with the screen (would it just be easier to but a different one)?

Bug Timeline

Seems to be present in any version 2.1.x

Expected behavior

The printer boots as normal with speaker enabled.

When the printer boots (or the dial on the LCD interacted with), I hear an audible tone from speaker.

Actual behavior

Enabling the speaker via beeper_pin causes the printer to crash on boot and re-boot.

Steps to Reproduce

1. Download marlin bugfix-2.1.x
2. Configure marlin for the Sovol SV06 (using GD32F103RET6_sovol_maple) using a beeper
3. Compile using PlatformIO
4. Flash for Sovol SV06
5. Watch as printer constantly re-boots

Version of Marlin Firmware

2.1.x/bugfix

Printer model

Sovol SV06

Electronics

Stock printer

LCD/Controller

12864 LCD

Other add-ons

None

Bed Leveling

ABL Bilinear mesh

Your Slicer

Prusa Slicer

Host Software

OctoPrint

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

My own fork of Marlin (using bugfix-2.1.x): https://github.com/mlewis-everley/Marlin/tree/2.1.x-SV06

configuration.h: https://github.com/mlewis-everley/Marlin/blob/2.1.x-SV06/Marlin/Configuration.h
configuration_adv.h: https://github.com/mlewis-everley/Marlin/blob/2.1.x-SV06/Marlin/Configuration_adv.h

[thisiskeithb]

This appears to be a known issue with the SV06/GD32 motherboard:

The speaker is disabled in the configuration because of crash issues it causes with the clone processor used in the Sovol.

But the speaker still works fine and produces the beeps and sounds you would expect. For those who want it disabled you can do so in the menu and save settings to not hear anything.

Originally posted by @hillsoftware in hillsoftware/sv06#13 (comment)

---

Disable the SPEAKER define in your config for now.

[mlewis-everley]

Hi @thisiskeithb, thank you for looking into this. I am not sure if it helps, but the stock fork of Marlin that Sovol created doesn't seem to have this issue, even though the pin mapping appears identical.

Is there anything about the Sovol fork that may be worth checking?

[thisiskeithb]

Is there anything about the Sovol fork that may be worth checking?

The SV06 source code appears to be based off Marlin 2.0.9.2, so I diffed them and didn't see anything related to pins/speaker/timers that may be the culprit.

Sovol disabled USE_WATCHDOG in Configuration_adv.h, so as a temporary test, does disabling USE_WATCHDOG with SPEAKER enabled work?

[mlewis-everley]

Thanks for looking at this @thisiskeithb . I am pretty stacked this week, but I will see if I can find some time try this out!

[mlewis-everley]

OK, only just gotten around to looking at this! I attempted to turn off watchdog and restore the beeper pin and the printer wouldn't even boot when trying to flash the firmware (just got an infinite blank screen).

Experimentally, I re-enabled watchdog then left the beeper pin as PC6 but then disabled SPEAKER in configuration.h. Flashing this now results in the speaker working!

I have no idea what is going on, it seems the issue is related to the SPEAKER config instead?