RC522. Communication with an active PICC

[ccanon]

Hi to all,

I'm trying to work with the RC522 reader and an active PICC (AS3953 from AMS). So far I have been able to set both at ISO 14443A Level-4 Protocol Mode. So now I should be able to communicate in both ways. I'm able to send data from PCD-->PICC, but no the other way. PCD buffer remains empty after sending data. I'm afraid that the problem could be the prologue.

I have read that The ISO 144443A Logic recognizes the command by observing the first received byte. The next picture is a screenshot of the PICC datasheet, where I can see the meaning of the first byte of the ISO block.

My question is, is there any table, similar to the previous one, but with the values of the first byte of the ISO 14443-4 PICC block

Thanks a lot, 

Carlos Canón

[ccanon]

Hi Kan, 

Yes, I did try with a Mifare classic  PICC and works well (it reads the eeprom). 

But for my project, I need to be able to transmit data from the PICC to the PCD, that's why I'm using the AMS PICC, because I can control the PICC via SPI and is compliant with ISO 14443-4, which as I understand it should let me send data from PICC -> PCD. Am I wrong?

Best regards,

Carlos 

[Kan_Li]

Hi Carlos,

Did you try your RC522 board with other tag/card? for example, a mifare card. Did it fail as well?

Have a great day,
Kan

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[ccanon]

Hi Kan, 

I finally can get some data transmitted from the PICC to the PCD. I wrongly set up for the receiving data. 

Now I'm using the Receive command to activates the receiver circuits. I'm having problems to send a data chain. For example:

      - If I try to send 3 bytes PICC --> PCD : [0x11] [0x12] [0x13], 

      - In the PCD I get [0x11] [0x00]

I think this may be due to the frame pattern, but I can't find more information about it.

Do you know where can I find more details about how to indicate the end of frame pattern or the length byte?

Best regards,

Carlos Canon

[Kan_Li]

Hello Carlos,

Since your RC522 board can work with a Mifare classic picc, there should be no problem with its hardware and software.Maybe you should contact AMS for further support on AS3953.

Have a great day,
Kan

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[ccanon]

Hello Kan, 

Do you know if that frame pattern that in-text I quote above is something standardized? Something described in the ISO 14443-4 probably? I couldn't find more information about it.

Best regards,

Carlos

[Kan_Li]

Hello Carlos,

I think you can trust the data sheet though I am not familiar with the PICC you choose. The data in that table should be complied with ISO14443-4 spec, and I checked the pattern for RATS and DESELECT which should be correct.

Have a great day,
Kan

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