Error in emulating Mifare Classic 4K card about chameleonmini HOT 5 CLOSED

Hi Marvin,

the reason for this is in the way the current firmware works. Since we had issues with the write speed of the external flash for certain readers, we currently buffer the memory in SRAM. Due to the limited space in the SRAM of the Xmega32, we decided to go for a 1K buffer - in our tests we rarely encountered 4K MFClassics. There are two possible solutions I think:

a) Switch back to the fully Flash-based version (may work with your reader, really depends on the hardware) - I'll check with Simon but I think it is easily possible

b) Replace the Xmega32 with an Xmega128 and increase the buffer size in RAM

For a future revision (that we currently test), we'll replace the flash with FRAM to solve this issue more elegantly.

Best
David

from chameleonmini.

Short update: I think for alternative a), you can use this firmware release:

https://github.com/emsec/ChameleonMini/tree/RevE-DirectFlashWriteThru/Firmware/Chameleon-Mini

Check the differences in Memory.c to see what is going on in detail.

from chameleonmini.

I see... Let me have a test.

Thx for you guys great work!!!

With best regard

from chameleonmini.

https://github.com/emsec/ChameleonMini/tree/RevE-DirectFlashWriteThru/Firmware/Chameleon-Mini

This firmware can work well in Mifare Diagnostic tool:

Delete some pics contain keys

This software costs about 30s to verify the keys, read the data;

Then i use ChameleonMini to pass my workspace door, unfortunately, it failed.

I counted the time, since i put the ChameleonMini on the door card reader until the screen popd out "Auth failed", spended about 10 seconds.

Now i gonna buy Xmega128, come back later...

from chameleonmini.

That is what I meant - certain readers are more sensitive to timing. Keep us posted on your progress.

from chameleonmini.