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JNieu.1
JNieu.1
Associate II
July 27, 2020
Solved

How to integrate NFC Reader ST25R3911B into my own program.

Hello!

I have been working with the NFC05A1 NFC Reader in combination with a G070RB, but am momentarily stuck on how to use it in my own program.

I have followed all the steps given in an other post with a person having close to the same issue: https://community.st.com/s/global-search/25R3911B?t=1595829552630

But I keep getting errors left and right on includes and functions, which makes me come to a question whether all of this is needed for just a 'simple' program.

My main question here is whether there is an easy way to implement a program to read the UID from an NFC Tag. It's all my program has to do, the example given in the X-CUBE-NFC5 seems a little too much for what I want it to do.

Kind regards,

Joey

    This topic has been closed for replies.
    Brian TIDAL
    Brian TIDALBest answer
    ST Technical Moderator
    August 24, 2020

    Hi,

    The CS signal is not properly driven: it should be low during a whole frame (e.g. low when sending the 03 03 polling command, in your trace the CS goes high in between). Make sure to have

    • Hardware NSS Signal: Disable
    • NSS Signa Type : Software
    • PB0 being defined as GPIO Mode: output push-pull , GPIO output: high and properly mapped to ST25R95_N_SS_PIN/PORT in platform.h

    SPI interface is not properly selected: in your IOC project, the SSI_0/Interface pin is not set. It should be 1 (see table 4 in the ST25R95 DataSheet). Make sure to have PC7 being defined as SSI_0 and being high.

    The SPI baud rate is exceeding the max ST25R95 SPI clock frequency. It should not exceed 2Mbits/s (current value is 8...). Make sure to update the presscaler to 8 (==> Mbits/s) or 16 (==> 1 Mbits/s).

    Rgds

    BT

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    JNieu.1
    JNieu.1Author
    Associate II
    August 24, 2020

    Hi Brian,

    This made it work, I was looking at the documentation in the CR95HF Datasheet which seems incomplete regarding to the ST25R95 Datasheet, unless the IRQ_IN pin is not needed at all.

    Kind Regards,

    Joey

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