米6体育平台手机版

SLOA192B April 2014 – March 2019 TRF7970A , TRF7970A

7.2.4 Receiving NDEF Packets

The NFC_run function switches between target and initiator until an NFC-enabled device is presented to the TRF7970A RF field. Once the peer-to-peer communication is established and eTempNFCState is NFC_DATA_EXCHANGE_PROTOCOL, the firmware checks the RX status with NFC_P2P_getReceiveState() . When a packet is received, the sP2PRxStatus.sDataReceivedStatus will be RECEIVED_FIRST_FRAGMENT, or RECEIVED_N_FRAGMENT, or RECEIVED_FRAGMENT_COMPLETED. When the first fragment is received from another NFC device if the packet is incomplete, the sP2PRxStatus.sDataReceivedStatus will be RECEIVED_FIRST_FRAGMENT. When the first fragment is received from another NFC device if the packet is complete, the sP2PRxStatus.sDataReceivedStatus will be RECEIVED_FRAGMENT_COMPLETED. When the packet is broken into multiple fragments due to the total size being larger than the SNEP queue the sP2PRxStatus.sDataReceivedStatus will be RECEIVED_N_FRAGMENT until the last fragment is received. When the last fragment is received, the sP2PRxStatus.sDataReceivedStatus will be RECEIVED_FRAGMENT_COMPLETED.

eTempNFCState = NFC_run();
if(eTempNFCState == NFC_DATA_EXCHANGE_PROTOCOL)
{
     else if(NFC_P2P_getModeStatus(&sP2PMode,&sP2PBitrate))
     {
          //
          // Read the receive status structure - check if there is a received packet from the Target
          //
          sP2PRxStatus = NFC_P2P_getReceiveState();
          if(sP2PRxStatus.sDataReceivedStatus != RECEIVED_NO_FRAGMENT)
          {
               ui16BytesReceived = sP2PRxStatus.ui16DataReceivedLength + ui16BytesReceived;

               // Check if the last packet was received completely
               if((uint16_t) sP2PRxStatus.ui32PacketSize == ui16BytesReceived)
               {
                    // Reset Bytes received
                    ui16BytesReceived = 0;
               }
          }
     }
}