LCD menu slow when selecting a file to print on SD card

When controlling my printer from the LCD encoder I find that in all of the menus (bar one) the movement of the highlighted line
is responsive.

However, in the "file to print" menu it is a lot slower and that is with only 3 file entries on the SD card --- to the extent that it feels
like I didnt move the encoder knob and do it again only to find it moves on twice, it's just slow.

Is there anyway to speed this up ??

It's not unusable, just irritating ...

Regards,
Dave

In marlin under
LCD and SD support you will find lines to adjust speed

// Setting are adjusted for My LCD
#define ENCODER_PULSES_PER_STEP 4 
#define ENCODER_STEPS_PER_MENU_ITEM 2
//Including lines to reverse direction
//#define REVERSE_ENCODER_DIRECTION
//#define REVERSE_MENU_DIRECTION

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Computer Programmer / Electronics Technician

Hmmm, I'll give it a try but I suspect that will affect all the other menus as well.

It is only one menu that is slow - when brousing the SD card for a file to print - the rest are OK.

Dave

If it is only a single SD Card Menu then It could be that the SD Card is not compatible with your 3D Printer.

Do you have the specs on SD card that your a using.

Edited 1 time(s). Last edit at 04/08/2022 08:50PM by Roberts_Clif.

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Computer Programmer / Electronics Technician

It may be reading the SD card each time you click which will noticeably slow things down.

Try enabling the following. The directory gets moved into RAM which really speeds things up. The only downside is you may run out of RAM on the 8 bit controllers.

SDCARD_SORT_ALPHA
SDSORT_USES_RAM    true
SDSORT_CACHE_NAMES true

That sounds more promising - I'll give that a try.
Bob

Quote
[email protected]
Try enabling the following.

SDCARD_SORT_ALPHA
SDSORT_USES_RAM    true
SDSORT_CACHE_NAMES true

Question this uses 20% more ram, how long will it keep the ram before releasing it.

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Computer Programmer / Electronics Technician

I don't think it ever gets released.

That did the trick but on my ATMEGA2560 based printer it left 742 bytes of RAM - so I reduced "SDSORT_LIMIT" from 40 to 20 as I dont keep many files on the SDCard, that gave me 1564 bytes of RAM.
Thanks for the help.
Dave

Quote
[email protected]
It may be reading the SD card each time you click which will noticeably slow things down.

Try enabling the following. The directory gets moved into RAM which really speeds things up. The only downside is you may run out of RAM on the 8 bit controllers.

SDCARD_SORT_ALPHA
SDSORT_USES_RAM    true
SDSORT_CACHE_NAMES true