Hello @MIMIwho
SW297857 also open source and you can refer to this example SW297857\Examples\Nfcrdlib_SimplifiedAPI_ISO to access ISO18000P3M3 device:
/* Configuring the activation profile as ISO */
phNfcLib_SetConfig_Value(PH_NFCLIB_CONFIG_ACTIVATION_PROFILE,PH_NFCLIB_ACTIVATION_PROFILE_ISO);
/* Activating the card with blocking activation mode */
phNfcLib_Activate(wTechnologyMask, &PeerInfo, NULL);
/* Reference application */
NfcLib_ISO18000p3m3_Reference_app();
For the details inside the functions, please check Nfcrdlib_SimplifiedApi_ISO_18000.c file.
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
Best regards,
Kelly
Technical Support
NXP Semiconductor