ISO14443-A prototyping on LPC8N04

[sreevan]

Hi,

I am trying out a proof of concept using the LPC8N04 development board whereby I need to make the board work like a bank card and be used in POS terminals. As a first step, i wanted to test the communication between the board and the terminal. So, wrote some rudimentary code to observe the messages coming in from terminal. The problem is that the terminal is not sending the "REQA" or "WUPA" command as i see it in the interrupt handler. The only two interrupts i receive are kNFC_NFCOffInterrupt (256) and kNFC_RFSelectInterrupt (2) [=258]. This happens continuously till i keep holding the board's NFC antenna over the POS terminal. I am not sure what is the reader terminal expecting back at this stage without any write into the shared memory or command register.I have tried sending a fixed ATR from the intterupt handling function but the terminal would still only invoke the same two interrupts again & again. I was able to successfully use NDEF with a different device to write and read but i am at a loss when trying bare NFC (without NDEF middleware) with the POS terminal. Can someone please help urgently?

[sreevan]

Can someone from NXP please help on this? After the select interrupt is received what should the tag do or send so that the reader's command can be received. There seems to be nothing in the shared memory since the targetwrite interrupt is not getting fired.