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PN532 ISO14443-4 communication Issue

Question asked by Christian Grenier on Dec 1, 2016
Latest reply on Feb 23, 2017 by Christian Grenier

Hello,

 

I'd like to communicate very fast from a PN532 (PICC) device with a PN512 (PCD) Initiator using the ISO14443-4.  I have a lot of data to transfer from PICC to PCD.  Since the PN512 has only 64 bytes in the FIFO, the PN532 uses the chaining mode to transfer 256 bytes.  I use the command 0x8E in PN532 to send 256 bytes and I can see that there're 4 x 64-bytes transmitted from PN532 to PN512.  

 

I attached an image to show the first 64 bytes transmission.

 

I'd like to understand why it takes several ms for the PN532 to transmit the first 64 bytes.  Is there a way to improve that?  To reduce the process time to send the first packet?

 

Please, refer to the image to understand my issue.  I took several days before posting this message.  

 

Thank you very much!

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