Problem in Reading Data from smart card frequently....????

[eshwartamil]

Hi to all........





I am using TDA8007B with a microcontroller 8xc51 to interface with MIFARE smart card and this unit is connected with my PC via RS232. I have written a code to send a APDU to the card and get a response from the card.I have given a Command to get a version of the MIFARE card.For the first time only it returns the correct information. when i am trying to give the same command for the next times it returns null.I have checked the parity error,ATR sequence. these are all working fine. I cant be able to find out a problem... please help me... its very urgent...

 

[aishiqi]

i also want to study mifare card.

 

[poor mystic]

hi
http://www.ru.nxp.com/support/ is as far as I could get, you'll need to submit your question by email.