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HPark.2
Visitor II
April 8, 2020
Solved

Inquiry about NFC reader/writer (CR95HF)

  • April 8, 2020
  • 3 replies
  • 1015 views

Hi !

I have a question about CR95HF. This module supports reader/writer.

I want to make 2 devices including CR95HF module to communicate each other.

I know that this module does not support peer to peer (P2P) feature.

Is it possible to send NDEF messages of one device to other device with this module ?

If not, could you please introduce other solutions for that ?

Thanks,

Hansung

    This topic has been closed for replies.
    Best answer by Brian TIDAL

    Hi Hansung,

    ST25DV-I2C dynamic tag provides:

    • an I2C interface with an MCU
    • a fast mailbox that can be use to exchange bi-directional messages between the MCU and a reader such as the ST25R95.

    Overview:

    MCU <--- I2C ---> ST25DV (Mailbox) <--- NFC RF Interface---> ST25R95<--SPI-->MCU

    The ST25DV-DISCOVERY provides a demo of such bi-directional communication that can be used with the ST25 NFC Tap App running on a Android phone.

    Rgds

    BT

    3 replies

    B
    Brian TIDAL
    Technical Moderator
    April 8, 2020

    Hi,

    can you describe more precisely your application? My guess is that you would like to be able to have NFC communications between 2 MCUs. If my guess is correct, I would recommend one of the following solutions:

    1. use ST25R95/CR95HF on one device and ST25DV-I2C dynamic tag on the second device. You can then easily communicate through the ST25DV-I2C mailbox in fast transfert mode.
    2. use ST25R3911B or ST25R3916 on both device and communicate in AP2P mode.

    Solution #1 would be the most cost efficient. The firmware package for ST25R95/CR95HF (X-NUCLEO-NFC3) supports ST25DV-I2C mailbox read write RF commands. ST25DV-DISCOVERY provides a ready to use example of mailbox on ST25DV-I2C.

    I would not recommend to use communication between 2 ST25R95.

    Rgds

    BT

    H
    HPark.2Author
    Visitor II
    April 8, 2020

    Brian. Thanks for your answers.

    ​

    Yes, you're exactly right. I have a question about solution #1.

    In this case, is it possible to communicate each other ? If it's one-way communication, it's not suitable for our project.

    Could you please check it again ?

    Thanks,

    Hansung

    B
    Brian TIDALAnswer
    Technical Moderator
    April 9, 2020

    Hi Hansung,

    ST25DV-I2C dynamic tag provides:

    • an I2C interface with an MCU
    • a fast mailbox that can be use to exchange bi-directional messages between the MCU and a reader such as the ST25R95.

    Overview:

    MCU <--- I2C ---> ST25DV (Mailbox) <--- NFC RF Interface---> ST25R95<--SPI-->MCU

    The ST25DV-DISCOVERY provides a demo of such bi-directional communication that can be used with the ST25 NFC Tap App running on a Android phone.

    Rgds

    BT

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