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MarlinFirmware / Marlin

Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
https://marlinfw.org
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[BUG] Strange behavior of the PWM fans on bugfix-2.1.x MKS Monster8 v2 #27004

Open wzaburko opened 3 weeks ago

wzaburko commented 3 weeks ago

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

Yes, and the problem still exists.

Bug Description

I'm trying to set up a new MKS Monster 8 motherboard with MKS_MINI_12864_V3. I previously used FLY407ZB on firmware 2.1.2.1 and had no issues. However, when adjusting the configs for the new board and using #define MKS_MINI_12864_V3, the display doesn't work (the motherboard functions correctly). But when using #define FYSETC_MINI_12864_2_1, the display works but the CF memory card slots don't. Also, it frequently loses connection with OctoPrint, sometimes even disconnecting without printing. So, I tried 2.1.2.2, and after successful installation, the board doesn't work - only the Marlin logo appears on the display, and there's no connection to OctoPrint, neither with #define MKS_MINI_12864_V3 nor with FYSETC_MINI_12864_2_1. I tried bugfix - the board, display, and CF cards work fine, but there's something strange with the PWM fans. They behave as if something is trying to turn them off every second. This happens on all three PWM Fans. I tried assigning different functions to these outputs - Hotend fan, blower, cooling, FAST_PWM_FAN_FREQUENCY off/on. It's the same in all configurations. Later, I noticed a slightly different behavior. You can see it in the attached videos.

https://drive.google.com/file/d/1pd7qVFSDFjl94BnoA-pWHWapWWTcHoVc/view?usp=drive_link https://drive.google.com/file/d/1e9ZJbsQ6c6__DYHxaZNaTAxtkHpqz9HL/view?usp=drive_link

Bug Timeline

No response

Expected behavior

No response

Actual behavior

No response

Steps to Reproduce

No response

Version of Marlin Firmware

bugfix-2.1.x

Printer model

personal project

Electronics

MKS Monster 8 v2

LCD/Controller

MKS_MINI_12864_V3

Other add-ons

No response

Bed Leveling

UBL Bilinear mesh

Your Slicer

Prusa Slicer

Host Software

OctoPrint

Don't forget to include

Additional information & file uploads

Conf.zip

rondlh commented 3 weeks ago

I have the same problem.

In buildroot\share\PlatformIO\variants\Marlin_F4x7Vx\variant.h

define TIMER_SERIAL TIM5 // TIMER_SERIAL must be defined in this file

Change to:

define TIMER_SERIAL TIM4 // TIMER_SERIAL must be defined in this file

This resolves the issue for me.

thisiskeithb commented 3 weeks ago

Most of the display issues should be resolved in https://github.com/MarlinFirmware/Marlin/pull/26988

wzaburko commented 3 weeks ago

I recompiled the bugfix - I changed TIM5 to TIM4 and I see that the fans are working correctly, the display and memory card also work, although when inserting and removing the card, the display dims for 2-3 seconds - I haven't investigated the cause yet - but works. But other than that (after a short test), it seems that everything is okay. I haven't tested 2.1.2.2. Thank you very much for the quick help. :)