SLOA192B April   2014  – March 2019 TRF7970A , TRF7970A

 

  1.   NFC active and passive peer-to-peer communication using the TRF7970A
    1.     Trademarks
    2. 1  Introduction
    3. 2  Initial RF Collision
    4. 3  TRF7970A Register Settings
    5. 4  Peer-to-Peer at 106 kbps
      1. 4.1 Active Communication
        1. 4.1.1 Initiator
        2. 4.1.2 Target
      2. 4.2 Passive Communication
        1. 4.2.1 Initiator
        2. 4.2.2 Target
    6. 5  Peer-to-Peer at 212 kbps and 424 kbps
      1. 5.1 Active Communication
        1. 5.1.1 Initiator
        2. 5.1.2 Target
      2. 5.2 Passive Communication
        1. 5.2.1 Initiator
        2. 5.2.2 Target
    7. 6  Hardware Description
      1. 6.1 LaunchPad™ Development Kit and BoosterPack™ Plug-in Module Setup
        1. 6.1.1 BoosterPack Plug-in Module: DLP-7970ABP
        2. 6.1.2 LaunchPad Development Kit: MSP-EXP430F5529LP
        3. 6.1.3 LaunchPad Development Kit: MSP-EXP432P401R
      2. 6.2 Bundle Available for Purchase
    8. 7  Passive and Active Peer-to-Peer Firmware Example
      1. 7.1 Peer-to-Peer APIs
      2. 7.2 Implementing a Peer-to-Peer Sample Application
        1. 7.2.1 Low-Level Initialization
        2. 7.2.2 Peer-to-Peer NFC Stack Setup
        3. 7.2.3 Sending NDEF Packets
        4. 7.2.4 Receiving NDEF Packets
    9. 8  Quick Start Guide
    10. 9  Operational Overview
    11. 10 Peer-to-Peer Interoperability Results
    12. 11 Conclusion
    13. 12 References
  2.   Revision History

5.1.2 Target

After receiving commands from the initiator, the transceiver must follow the next steps each time before responding to the initiator:

  1. Delay time specified in the technology specification (56 µs to 188 µs).
  2. Perform Response RF Collision avoidance, and ensure no RF field is detected.
  3. ISO Control register (0x01) → 0x32 (NFC-F at 212 kbps).
  4. Delay 1 ms
  5. Send packet:
    1. Reset FIFO (0x0F) direct command.
    2. Transmission with CRC direct command (0x11).
    3. TX Length Byte 1 and 2 (0x1D and 0x1E) registers.
    4. Write the response to the FIFO.

NOTE

For more details on the NFC-F protocol, see [2], [3], [6], [7] and [8].
peer_to_peer_212kbps_active_initiator_anti_collision_sloa192.gifFigure 12. Peer-to-Peer 212-kbps Active Initiator Anticollision