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Thanks Andreas.I will refer the polling project code.BTW got it solved by writing a UART library in my main program.

I have another doubt.
In the RC663-LPC1227-Classic program authentication is done using the below function

PH_CHECK_SUCCESS_FCT(status, phpalMifare_MfcAuthenticate(&palMifare,
0, PHHAL_HW_MFC_KEYA, Key, bUid));
The default key given is :

static /* const */ uint8_t Key[6] = {0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU};

Now i tried to write new key number for authorisation by below given function: PH_CHECK_SUCCESS_FCT(status, phKeyStore_SetKey(&Rc663keyStore, 0, 0,
PH_KEYSTORE_KEY_TYPE_MIFARE, Key, 0));

It didnt work.Kindly suggest ways to load a new key for sector authorisation.Thanks in advance.

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