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

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eshwartamil

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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...
 

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