Is there any example file of Card Emulation Mode?

[eagles64]

Hello

I have a custom board with the st25r3920B. I want to operate this board in CE mode.

So I set RFAL_FEATURE_LISTEN_MODE to true. 

But there is a difficulty because there is no sequence or example code for how to operate in CE mode.

Where should NDEF data be set and how do I set AID?

Is there any working example, or documentation to implement card emulation?

[Brian TIDAL · Accepted solution]

Hi,

X-CUBE-NFC6 provides a polling example that supports T3T and T4T CE mode and emulates a tag having an NDEF message. The STSW-ST25R016 (ST25 embedded NFC library) also provides a dedicated CE example (its emulate a pairing record).

See demoCE function inside demo_polling.c. In this demo, you can also set the DEMO_CARD_EMULATION_ONLY flag to have only CE mode and disable reader activities (otherwise the device will alternate between reader mode and card emulation mode during polling)

Rgds

BT

[eagles64]

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[eagles64]

Hi, 

Thanks to your support. I checked the example code and NDEF stack library well.

I have one more question, do I need RF matching even when running in CE mode?

When the device operating as a reader in the NFC reads data from the tag(CE mode tag),

I think there was nothing to control on the tag side, because the device supplies power to the tag.

But I think the sensitivity is not good when operation in CE mode.

The reader device responds very occasionally.. Is this not my problem, but the reader's problem?

How do I get my CE mode to react well with the reader device?

[Ulysses HERNIOSUS]

Hi eagles64,

the existing demos we are providing (X-NUCLEO-NFC06/8) should show good performance in Reader and tag mode. 

Even for tag mode you need to match to adapt the resonance frequency. For a pure tag application one could imagine moving to completely different matching topologies (removing EMC filter, maybe disconnecting RFO pins and solely modulate using EXT_LM, ...) but we cannot give you guidance on these topics. Your easiest way forward is to stick with matchings as described in AN5276.

Best Regards, Ulysses