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cmpxchg
(@cmpxchg)
Member
sd card shows up empty

On my MK3 with older, and just-updated firmware, all SDcards show up empty, even when freshly formatted with FAT32. Symptom is similar to:

https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/prusa-mk3-will-read-cards-but-cant-see-files-in-it-please-help/

1)

Can prusa provide an small image that can be linearly/sequentially written to the SDcard (i.e. RPI disk imaging tool), containing the right partitiontable, filesystem headers, and sample g-code files, that leaved the SDcard blockdevice in a state that should be able to be read by any MK3 firmware ?

2) more technical questions

Where do I find the firmware source ? Is the SDcard accessed in SPI mode ? What if signals CMD and DAT0 is ok, but DAT1..DAT3 are degraded? Are MMC commands attempted ? What sequence of blocks are read ? Are there any flags that can confuse the display of the root directory ? Are there limitation on how the 'System Volume Information' directory is organized ? I do not have a logic analyser / easy way to probe this issue right now - and I undestood that the firmware is already very tight in footprint...

Best Answer by cmpxchg:

I think I found the problem. I disassembled the control PCB, and looked into the slot with a microscope, focussing in the depth of the SD card reader slot.

There was a small blue fragment 1x1x1 mm stuck in the slot. I lifted up the metal lever and the part dropped out of the slot.

After a few attempts, an SD card could be detected, and also being read.

This topic was modified 3 months ago by cmpxchg
Posted : 26/11/2023 9:11 pm
cmpxchg
(@cmpxchg)
Member
Topic starter answered:
RE: sd card shows up empty

I think I found the problem. I disassembled the control PCB, and looked into the slot with a microscope, focussing in the depth of the SD card reader slot.

There was a small blue fragment 1x1x1 mm stuck in the slot. I lifted up the metal lever and the part dropped out of the slot.

After a few attempts, an SD card could be detected, and also being read.

Posted : 27/11/2023 5:46 pm
cmpxchg
(@cmpxchg)
Member
Topic starter answered:
RE: sd card shows up empty

It is intermittent - inserting SDcard and turning printer off and on again seems to work - I guess the card insertion/powerrail of card is not perfect yet.

Posted : 27/11/2023 8:24 pm
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