flipperzero-firmware/lib/ST25RFAL002/source/rfal_nfc.c

/**
  ******************************************************************************
  *
  * COPYRIGHT(c) 2020 STMicroelectronics
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/*! \file rfal_nfc.c
 *
 *  \author Gustavo Patricio
 *
 *  \brief RFAL NFC device  
 *  
 *  This module provides the required features to behave as an NFC Poller 
 *  or Listener device. It grants an easy to use interface for the following
 *  activities: Technology Detection, Collision Resollution, Activation,
 *  Data Exchange, and Deactivation
 *  
 *  This layer is influenced by (but not fully aligned with) the NFC Forum 
 *  specifications, in particular: Activity 2.0 and NCI 2.0
 *
 */

/*
 ******************************************************************************
 * INCLUDES
 ******************************************************************************
 */
#include "rfal_nfc.h"
#include "utils.h"
#include "rfal_analogConfig.h"

/*
******************************************************************************
* GLOBAL DEFINES
******************************************************************************
*/
#define RFAL_NFC_MAX_DEVICES 5U /* Max number of devices supported */

/*
******************************************************************************
* GLOBAL MACROS
******************************************************************************
*/

#define rfalNfcNfcNotify(st) \
    if(gNfcDev.disc.notifyCb != NULL) gNfcDev.disc.notifyCb(st)

/*
******************************************************************************
* GLOBAL TYPES
******************************************************************************
*/

/*! Buffer union, only one interface is used at a time                                                             */
typedef union { /*  PRQA S 0750 # MISRA 19.2 - Members of the union will not be used concurrently, only one interface at a time */
    rfalIsoDepBufFormat isoDepBuf; /*!< ISO-DEP buffer format (with header/prologue)       */
    rfalNfcDepBufFormat nfcDepBuf; /*!< NFC-DEP buffer format (with header/prologue)       */
} rfalNfcTmpBuffer;

typedef struct {
    rfalNfcState state; /* Main state                                      */
    uint16_t techsFound; /* Technologies found bitmask                      */
    uint16_t techs2do; /* Technologies still to be performed              */
    rfalBitRate ap2pBR; /* Bit rate to poll for AP2P                       */
    uint8_t selDevIdx; /* Selected device index                           */
    rfalNfcDevice* activeDev; /* Active device pointer                           */
    rfalNfcDiscoverParam disc; /* Discovery parameters                            */
    rfalNfcDevice devList[RFAL_NFC_MAX_DEVICES]; /*!< Location of device list          */
    uint8_t devCnt; /* Decices found counter                           */
    uint32_t discTmr; /* Discovery Total duration timer                  */
    ReturnCode dataExErr; /* Last Data Exchange error                        */
    bool discRestart; /* Restart discover after deactivation flag        */
    bool isRxChaining; /* Flag indicating Other device is chaining        */
    uint32_t lmMask; /* Listen Mode mask                                */
    bool isTechInit; /* Flag indicating technology has been set         */
    bool isOperOngoing; /* Flag indicating opration is ongoing             */

    rfalNfcBuffer txBuf; /* Tx buffer for Data Exchange                     */
    rfalNfcBuffer rxBuf; /* Rx buffer for Data Exchange                     */
    uint16_t rxLen; /* Length of received data on Data Exchange        */

#if RFAL_FEATURE_NFC_DEP || RFAL_FEATURE_ISO_DEP
    rfalNfcTmpBuffer tmpBuf; /* Tmp buffer for Data Exchange                    */
#endif /* RFAL_FEATURE_NFC_DEP || RFAL_FEATURE_ISO_DEP */

} rfalNfc;

/*
 ******************************************************************************
 * LOCAL VARIABLES
 ******************************************************************************
 */
#ifdef RFAL_TEST_MODE
rfalNfc gNfcDev;
#else /* RFAL_TEST_MODE */
static rfalNfc gNfcDev;
#endif /* RFAL_TEST_MODE */

/*
******************************************************************************
* LOCAL FUNCTION PROTOTYPES
******************************************************************************
*/
static ReturnCode rfalNfcPollTechDetetection(void);
static ReturnCode rfalNfcPollCollResolution(void);
static ReturnCode rfalNfcPollActivation(uint8_t devIt);
static ReturnCode rfalNfcDeactivation(void);

#if RFAL_FEATURE_NFC_DEP
static ReturnCode rfalNfcNfcDepActivate(
    rfalNfcDevice* device,
    rfalNfcDepCommMode commMode,
    const uint8_t* atrReq,
    uint16_t atrReqLen);
#endif /* RFAL_FEATURE_NFC_DEP */

#if RFAL_FEATURE_LISTEN_MODE
static ReturnCode rfalNfcListenActivation(void);
#endif /* RFAL_FEATURE_LISTEN_MODE*/

/*******************************************************************************/
ReturnCode rfalNfcInitialize(void) {
    ReturnCode err;

    gNfcDev.state = RFAL_NFC_STATE_NOTINIT;

    rfalAnalogConfigInitialize(); /* Initialize RFAL's Analog Configs */
    EXIT_ON_ERR(err, rfalInitialize()); /* Initialize RFAL */

    gNfcDev.state = RFAL_NFC_STATE_IDLE; /* Go to initialized */
    return ERR_NONE;
}

/*******************************************************************************/
ReturnCode rfalNfcDiscover(const rfalNfcDiscoverParam* disParams) {
    /* Check if initialization has been performed */
    if(gNfcDev.state != RFAL_NFC_STATE_IDLE) {
        return ERR_WRONG_STATE;
    }

    /* Check valid parameters */
    if((disParams == NULL) || (disParams->devLimit > RFAL_NFC_MAX_DEVICES) ||
       (disParams->devLimit == 0U) ||
       ((disParams->maxBR > RFAL_BR_1695) && (disParams->maxBR != RFAL_BR_KEEP)) ||
       (((disParams->techs2Find & RFAL_NFC_POLL_TECH_F) != 0U) &&
        (disParams->nfcfBR != RFAL_BR_212) && (disParams->nfcfBR != RFAL_BR_424)) ||
       ((((disParams->techs2Find & RFAL_NFC_POLL_TECH_AP2P) != 0U) &&
         (disParams->ap2pBR > RFAL_BR_424)) ||
        (disParams->GBLen > RFAL_NFCDEP_GB_MAX_LEN))) {
        return ERR_PARAM;
    }

    if((((disParams->techs2Find & RFAL_NFC_POLL_TECH_A) != 0U) && !((bool)RFAL_FEATURE_NFCA)) ||
       (((disParams->techs2Find & RFAL_NFC_POLL_TECH_B) != 0U) && !((bool)RFAL_FEATURE_NFCB)) ||
       (((disParams->techs2Find & RFAL_NFC_POLL_TECH_F) != 0U) && !((bool)RFAL_FEATURE_NFCF)) ||
       (((disParams->techs2Find & RFAL_NFC_POLL_TECH_V) != 0U) && !((bool)RFAL_FEATURE_NFCV)) ||
       (((disParams->techs2Find & RFAL_NFC_POLL_TECH_ST25TB) != 0U) &&
        !((bool)RFAL_FEATURE_ST25TB)) ||
       (((disParams->techs2Find & RFAL_NFC_POLL_TECH_AP2P) != 0U) &&
        !((bool)RFAL_FEATURE_NFC_DEP)) ||
       (((disParams->techs2Find & RFAL_NFC_LISTEN_TECH_A) != 0U) && !((bool)RFAL_FEATURE_NFCA)) ||
       (((disParams->techs2Find & RFAL_NFC_LISTEN_TECH_B) != 0U) && !((bool)RFAL_FEATURE_NFCB)) ||
       (((disParams->techs2Find & RFAL_NFC_LISTEN_TECH_F) != 0U) && !((bool)RFAL_FEATURE_NFCF)) ||
       (((disParams->techs2Find & RFAL_NFC_LISTEN_TECH_AP2P) != 0U) &&
        !((bool)RFAL_FEATURE_NFC_DEP))) {
        return ERR_DISABLED; /*  PRQA S  2880 # MISRA 2.1 - Unreachable code due to configuration option being set/unset  */
    }

    /* Initialize context for discovery */
    gNfcDev.activeDev = NULL;
    gNfcDev.techsFound = RFAL_NFC_TECH_NONE;
    gNfcDev.devCnt = 0;
    gNfcDev.discRestart = true;
    gNfcDev.isTechInit = false;
    gNfcDev.disc = *disParams;

    /* Calculate Listen Mask */
    gNfcDev.lmMask = 0U;
    gNfcDev.lmMask |=
        (((gNfcDev.disc.techs2Find & RFAL_NFC_LISTEN_TECH_A) != 0U) ? RFAL_LM_MASK_NFCA : 0U);
    gNfcDev.lmMask |=
        (((gNfcDev.disc.techs2Find & RFAL_NFC_LISTEN_TECH_B) != 0U) ? RFAL_LM_MASK_NFCB : 0U);
    gNfcDev.lmMask |=
        (((gNfcDev.disc.techs2Find & RFAL_NFC_LISTEN_TECH_F) != 0U) ? RFAL_LM_MASK_NFCF : 0U);
    gNfcDev.lmMask |=
        (((gNfcDev.disc.techs2Find & RFAL_NFC_LISTEN_TECH_AP2P) != 0U) ? RFAL_LM_MASK_ACTIVE_P2P :
                                                                         0U);

#if !RFAL_FEATURE_LISTEN_MODE
    /* Check if Listen Mode is supported/Enabled */
    if(gNfcDev.lmMask != 0U) {
        return ERR_DISABLED;
    }
#endif

    gNfcDev.state = RFAL_NFC_STATE_START_DISCOVERY;

    return ERR_NONE;
}

/*******************************************************************************/
ReturnCode rfalNfcDeactivate(bool discovery) {
    /* Check for valid state */
    if(gNfcDev.state <= RFAL_NFC_STATE_IDLE) {
        return ERR_WRONG_STATE;
    }

    /* Check if discovery is to continue afterwards */
    if((discovery == true) && (gNfcDev.disc.techs2Find != RFAL_NFC_TECH_NONE)) {
        /* If so let the state machine continue*/
        gNfcDev.discRestart = discovery;
        gNfcDev.state = RFAL_NFC_STATE_DEACTIVATION;
    } else {
        /* Otherwise deactivate immediately and go to IDLE */
        rfalNfcDeactivation();
        gNfcDev.state = RFAL_NFC_STATE_IDLE;
    }

    return ERR_NONE;
}

/*******************************************************************************/
ReturnCode rfalNfcSelect(uint8_t devIdx) {
    /* Check for valid state */
    if(gNfcDev.state != RFAL_NFC_STATE_POLL_SELECT) {
        return ERR_WRONG_STATE;
    }

    gNfcDev.selDevIdx = devIdx;
    gNfcDev.state = RFAL_NFC_STATE_POLL_ACTIVATION;

    return ERR_NONE;
}

/*******************************************************************************/
rfalNfcState rfalNfcGetState(void) {
    return gNfcDev.state;
}

/*******************************************************************************/
ReturnCode rfalNfcGetDevicesFound(rfalNfcDevice** devList, uint8_t* devCnt) {
    /* Check for valid state */
    if(gNfcDev.state < RFAL_NFC_STATE_POLL_SELECT) {
        return ERR_WRONG_STATE;
    }

    /* Check valid parameters */
    if((devList == NULL) || (devCnt == NULL)) {
        return ERR_PARAM;
    }

    *devCnt = gNfcDev.devCnt;
    *devList = gNfcDev.devList;

    return ERR_NONE;
}

/*******************************************************************************/
ReturnCode rfalNfcGetActiveDevice(rfalNfcDevice** dev) {
    /* Check for valid state */
    if(gNfcDev.state < RFAL_NFC_STATE_ACTIVATED) {
        return ERR_WRONG_STATE;
    }

    /* Check valid parameter */
    if(dev == NULL) {
        return ERR_PARAM;
    }

    /* Check for valid state */
    if((gNfcDev.devCnt == 0U) || (gNfcDev.activeDev == NULL)) {
        return ERR_REQUEST;
    }

    *dev = gNfcDev.activeDev;
    return ERR_NONE;
}

/*******************************************************************************/
void rfalNfcWorker(void) {
    ReturnCode err;

    rfalWorker(); /* Execute RFAL process  */

    switch(gNfcDev.state) {
    /*******************************************************************************/
    case RFAL_NFC_STATE_NOTINIT:
    case RFAL_NFC_STATE_IDLE:
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_START_DISCOVERY:

        /* Initialize context for discovery cycle */
        gNfcDev.devCnt = 0;
        gNfcDev.selDevIdx = 0;
        gNfcDev.techsFound = RFAL_NFC_TECH_NONE;
        gNfcDev.techs2do = gNfcDev.disc.techs2Find;
        gNfcDev.state = RFAL_NFC_STATE_POLL_TECHDETECT;

#if RFAL_FEATURE_WAKEUP_MODE
        /* Check if Low power Wake-Up is to be performed */
        if(gNfcDev.disc.wakeupEnabled) {
            /* Initialize Low power Wake-up mode and wait */
            err = rfalWakeUpModeStart(
                (gNfcDev.disc.wakeupConfigDefault ? NULL : &gNfcDev.disc.wakeupConfig));
            if(err == ERR_NONE) {
                gNfcDev.state = RFAL_NFC_STATE_WAKEUP_MODE;
                rfalNfcNfcNotify(gNfcDev.state); /* Notify caller that WU was started */
            }
        }
#endif /* RFAL_FEATURE_WAKEUP_MODE */
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_WAKEUP_MODE:

#if RFAL_FEATURE_WAKEUP_MODE
        /* Check if the Wake-up mode has woke */
        if(rfalWakeUpModeHasWoke()) {
            rfalWakeUpModeStop(); /* Disable Wake-up mode           */
            gNfcDev.state = RFAL_NFC_STATE_POLL_TECHDETECT; /* Go to Technology detection     */

            rfalNfcNfcNotify(gNfcDev.state); /* Notify caller that WU has woke */
        }
#endif /* RFAL_FEATURE_WAKEUP_MODE */

        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_POLL_TECHDETECT:

        /* Start total duration timer */
        platformTimerDestroy(gNfcDev.discTmr);
        gNfcDev.discTmr = (uint32_t)platformTimerCreate(gNfcDev.disc.totalDuration);

        err =
            rfalNfcPollTechDetetection(); /* Perform Technology Detection                         */
        if(err != ERR_BUSY) /* Wait until all technologies are performed            */
        {
            if((err != ERR_NONE) ||
               (gNfcDev.techsFound ==
                RFAL_NFC_TECH_NONE)) /* Check if any error occurred or no techs were found   */
            {
                rfalFieldOff();
                gNfcDev.state =
                    RFAL_NFC_STATE_LISTEN_TECHDETECT; /* Nothing found as poller, go to listener */
                break;
            }

            gNfcDev.techs2do =
                gNfcDev.techsFound; /* Store the found technologies for collision resolution */
            gNfcDev.state =
                RFAL_NFC_STATE_POLL_COLAVOIDANCE; /* One or more devices found, go to Collision Avoidance  */
        }
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_POLL_COLAVOIDANCE:

        err =
            rfalNfcPollCollResolution(); /* Resolve any eventual collision                       */
        if(err != ERR_BUSY) /* Wait until all technologies are performed            */
        {
            if((err != ERR_NONE) ||
               (gNfcDev.devCnt == 0U)) /* Check if any error occurred or no devices were found */
            {
                gNfcDev.state = RFAL_NFC_STATE_DEACTIVATION;
                break; /* Unable to retrieve any device, restart loop          */
            }

            /* Check if more than one device has been found */
            if(gNfcDev.devCnt > 1U) {
                /* If more than one device was found inform upper layer to choose which one to activate */
                if(gNfcDev.disc.notifyCb != NULL) {
                    gNfcDev.state = RFAL_NFC_STATE_POLL_SELECT;
                    gNfcDev.disc.notifyCb(gNfcDev.state);
                    break;
                }
            }

            /* If only one device or no callback has been set, activate the first device found */
            gNfcDev.selDevIdx = 0U;
            gNfcDev.state = RFAL_NFC_STATE_POLL_ACTIVATION;
        }
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_POLL_ACTIVATION:

        err = rfalNfcPollActivation(gNfcDev.selDevIdx);
        if(err != ERR_BUSY) /* Wait until all Activation is complete */
        {
            if(err != ERR_NONE) /* Activation failed selected device  */
            {
                gNfcDev.state =
                    RFAL_NFC_STATE_DEACTIVATION; /* If Activation failed, restart loop */
                break;
            }

            gNfcDev.state = RFAL_NFC_STATE_ACTIVATED; /* Device has been properly activated */
            rfalNfcNfcNotify(
                gNfcDev.state); /* Inform upper layer that a device has been activated */
        }
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_DATAEXCHANGE:

        rfalNfcDataExchangeGetStatus(); /* Run the internal state machine */

        if(gNfcDev.dataExErr != ERR_BUSY) /* If Dataexchange has terminated */
        {
            gNfcDev.state = RFAL_NFC_STATE_DATAEXCHANGE_DONE; /* Go to done state               */
            rfalNfcNfcNotify(gNfcDev.state); /* And notify caller              */
        }
        if(gNfcDev.dataExErr == ERR_SLEEP_REQ) /* Check if Listen mode has to go to Sleep */
        {
            gNfcDev.state = RFAL_NFC_STATE_LISTEN_SLEEP; /* Go to Listen Sleep state       */
            rfalNfcNfcNotify(gNfcDev.state); /* And notify caller              */
        }
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_DEACTIVATION:

        rfalNfcDeactivation(); /* Deactivate current device */

        gNfcDev.state =
            ((gNfcDev.discRestart) ? RFAL_NFC_STATE_START_DISCOVERY : RFAL_NFC_STATE_IDLE);
        rfalNfcNfcNotify(gNfcDev.state); /* Notify caller             */
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_LISTEN_TECHDETECT:

        if(platformTimerIsExpired(gNfcDev.discTmr)) {
#if RFAL_FEATURE_LISTEN_MODE
            rfalListenStop();
#else
            rfalFieldOff();
#endif /* RFAL_FEATURE_LISTEN_MODE */

            gNfcDev.state = RFAL_NFC_STATE_START_DISCOVERY; /* Restart the discovery loop */
            rfalNfcNfcNotify(gNfcDev.state); /* Notify caller             */
            break;
        }

#if RFAL_FEATURE_LISTEN_MODE

        if(gNfcDev.lmMask != 0U) /* Check if configured to perform Listen mode */
        {
            err = rfalListenStart(
                gNfcDev.lmMask,
                &gNfcDev.disc.lmConfigPA,
                NULL,
                &gNfcDev.disc.lmConfigPF,
                (uint8_t*)&gNfcDev.rxBuf.rfBuf,
                (uint16_t)rfalConvBytesToBits(sizeof(gNfcDev.rxBuf.rfBuf)),
                &gNfcDev.rxLen);
            if(err == ERR_NONE) {
                gNfcDev.state =
                    RFAL_NFC_STATE_LISTEN_COLAVOIDANCE; /* Wait for listen mode to be activated */
            }
        }
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_LISTEN_COLAVOIDANCE:

        if(platformTimerIsExpired(
               gNfcDev.discTmr)) /* Check if the total duration has been reached */
        {
            rfalListenStop();
            gNfcDev.state = RFAL_NFC_STATE_START_DISCOVERY; /* Restart the discovery loop */
            rfalNfcNfcNotify(gNfcDev.state); /* Notify caller             */
            break;
        }

        /* Check for external field */
        if(rfalListenGetState(NULL, NULL) >= RFAL_LM_STATE_IDLE) {
            gNfcDev.state =
                RFAL_NFC_STATE_LISTEN_ACTIVATION; /* Wait for listen mode to be activated */
        }
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_LISTEN_ACTIVATION:
    case RFAL_NFC_STATE_LISTEN_SLEEP:

        err = rfalNfcListenActivation();
        if(err != ERR_BUSY) {
            if(err == ERR_NONE) {
                gNfcDev.activeDev =
                    gNfcDev.devList; /* Assign the active device to be used further on */
                gNfcDev.devCnt++;

                gNfcDev.state = RFAL_NFC_STATE_ACTIVATED; /* Device has been properly activated */
                rfalNfcNfcNotify(
                    gNfcDev.state); /* Inform upper layer that a device has been activated */
            } else {
                rfalListenStop();
                gNfcDev.state = RFAL_NFC_STATE_START_DISCOVERY; /* Restart the discovery loop */
                rfalNfcNfcNotify(gNfcDev.state); /* Notify caller             */
            }
        }
#endif /* RFAL_FEATURE_LISTEN_MODE */
        break;

    /*******************************************************************************/
    case RFAL_NFC_STATE_ACTIVATED:
    case RFAL_NFC_STATE_POLL_SELECT:
    case RFAL_NFC_STATE_DATAEXCHANGE_DONE:
    default:
        return;
    }
}

/*******************************************************************************/
ReturnCode rfalNfcDataExchangeStart(
    uint8_t* txData,
    uint16_t txDataLen,
    uint8_t** rxData,
    uint16_t** rvdLen,
    uint32_t fwt,
    uint32_t flags) {
    ReturnCode err;
    rfalTransceiveContext ctx;

    /*******************************************************************************/
    /* The Data Exchange is divided in two different moments, the trigger/Start of *
     *  the transfer followed by the check until its completion                    */
    if((gNfcDev.state >= RFAL_NFC_STATE_ACTIVATED) && (gNfcDev.activeDev != NULL)) {
        /*******************************************************************************/
        /* In Listen mode is the Poller that initiates the communicatation             */
        /* Assign output parameters and rfalNfcDataExchangeGetStatus will return       */
        /* incoming data from Poller/Initiator                                         */
        if((gNfcDev.state == RFAL_NFC_STATE_ACTIVATED) &&
           rfalNfcIsRemDevPoller(gNfcDev.activeDev->type)) {
            if(txDataLen > 0U) {
                return ERR_WRONG_STATE;
            }

            *rvdLen = (uint16_t*)&gNfcDev.rxLen;
            *rxData = (uint8_t*)(  (gNfcDev.activeDev->rfInterface == RFAL_NFC_INTERFACE_ISODEP) ? gNfcDev.rxBuf.isoDepBuf.apdu : 
                                  ((gNfcDev.activeDev->rfInterface == RFAL_NFC_INTERFACE_NFCDEP) ? gNfcDev.rxBuf.nfcDepBuf.pdu  : gNfcDev.rxBuf.rfBuf));
            if(gNfcDev.disc.activate_after_sak) {
                gNfcDev.state = RFAL_NFC_STATE_DATAEXCHANGE_DONE;
            }
            return ERR_NONE;
        }

        /*******************************************************************************/
        switch(gNfcDev.activeDev
                   ->rfInterface) /* Check which RF interface shall be used/has been activated */
        {
        /*******************************************************************************/
        case RFAL_NFC_INTERFACE_RF:

            rfalCreateByteFlagsTxRxContext(
                ctx,
                (uint8_t*)txData,
                txDataLen,
                gNfcDev.rxBuf.rfBuf,
                sizeof(gNfcDev.rxBuf.rfBuf),
                &gNfcDev.rxLen,
                flags,
                fwt);
            if(flags == RFAL_TXRX_FLAGS_RAW) {
                ctx.txBufLen = txDataLen;
            }
            *rxData = (uint8_t*)gNfcDev.rxBuf.rfBuf;
            *rvdLen = (uint16_t*)&gNfcDev.rxLen;
            err = rfalStartTransceive(&ctx);
            break;

#if RFAL_FEATURE_ISO_DEP
        /*******************************************************************************/
        case RFAL_NFC_INTERFACE_ISODEP: {
            rfalIsoDepApduTxRxParam isoDepTxRx;

            if(txDataLen > sizeof(gNfcDev.txBuf.isoDepBuf.apdu)) {
                return ERR_NOMEM;
            }

            if(txDataLen > 0U) {
                ST_MEMCPY((uint8_t*)gNfcDev.txBuf.isoDepBuf.apdu, txData, txDataLen);
            }

            isoDepTxRx.DID = RFAL_ISODEP_NO_DID;
            isoDepTxRx.ourFSx = RFAL_ISODEP_FSX_KEEP;
            isoDepTxRx.FSx = gNfcDev.activeDev->proto.isoDep.info.FSx;
            isoDepTxRx.dFWT = gNfcDev.activeDev->proto.isoDep.info.dFWT;
            isoDepTxRx.FWT = gNfcDev.activeDev->proto.isoDep.info.FWT;
            isoDepTxRx.txBuf = &gNfcDev.txBuf.isoDepBuf;
            isoDepTxRx.txBufLen = txDataLen;
            isoDepTxRx.rxBuf = &gNfcDev.rxBuf.isoDepBuf;
            isoDepTxRx.rxLen = &gNfcDev.rxLen;
            isoDepTxRx.tmpBuf = &gNfcDev.tmpBuf.isoDepBuf;
            *rxData = (uint8_t*)gNfcDev.rxBuf.isoDepBuf.apdu;
            *rvdLen = (uint16_t*)&gNfcDev.rxLen;

            /*******************************************************************************/
            /* Trigger a RFAL ISO-DEP Transceive                                           */
            err = rfalIsoDepStartApduTransceive(isoDepTxRx);
            break;
        }
#endif /* RFAL_FEATURE_ISO_DEP */

#if RFAL_FEATURE_NFC_DEP
        /*******************************************************************************/
        case RFAL_NFC_INTERFACE_NFCDEP: {
            rfalNfcDepPduTxRxParam nfcDepTxRx;

            if(txDataLen > sizeof(gNfcDev.txBuf.nfcDepBuf.pdu)) {
                return ERR_NOMEM;
            }

            if(txDataLen > 0U) {
                ST_MEMCPY((uint8_t*)gNfcDev.txBuf.nfcDepBuf.pdu, txData, txDataLen);
            }

            nfcDepTxRx.DID = RFAL_NFCDEP_DID_KEEP;
            nfcDepTxRx.FSx =
                rfalNfcIsRemDevListener(gNfcDev.activeDev->type) ?
                    rfalNfcDepLR2FS((uint8_t)rfalNfcDepPP2LR(
                        gNfcDev.activeDev->proto.nfcDep.activation.Target.ATR_RES.PPt)) :
                    rfalNfcDepLR2FS((uint8_t)rfalNfcDepPP2LR(
                        gNfcDev.activeDev->proto.nfcDep.activation.Initiator.ATR_REQ.PPi));
            nfcDepTxRx.dFWT = gNfcDev.activeDev->proto.nfcDep.info.dFWT;
            nfcDepTxRx.FWT = gNfcDev.activeDev->proto.nfcDep.info.FWT;
            nfcDepTxRx.txBuf = &gNfcDev.txBuf.nfcDepBuf;
            nfcDepTxRx.txBufLen = txDataLen;
            nfcDepTxRx.rxBuf = &gNfcDev.rxBuf.nfcDepBuf;
            nfcDepTxRx.rxLen = &gNfcDev.rxLen;
            nfcDepTxRx.tmpBuf = &gNfcDev.tmpBuf.nfcDepBuf;
            *rxData = (uint8_t*)gNfcDev.rxBuf.nfcDepBuf.pdu;
            *rvdLen = (uint16_t*)&gNfcDev.rxLen;

            /*******************************************************************************/
            /* Trigger a RFAL NFC-DEP Transceive                                           */
            err = rfalNfcDepStartPduTransceive(nfcDepTxRx);
            break;
        }
#endif /* RFAL_FEATURE_NFC_DEP */

        /*******************************************************************************/
        default:
            err = ERR_PARAM;
            break;
        }

        /* If a transceive has succesfully started flag Data Exchange as ongoing */
        if(err == ERR_NONE) {
            gNfcDev.dataExErr = ERR_BUSY;
            gNfcDev.state = RFAL_NFC_STATE_DATAEXCHANGE;
        }

        return err;
    }

    return ERR_WRONG_STATE;
}

ReturnCode rfalNfcDataExchangeCustomStart(
    uint8_t* txData,
    uint16_t txDataLen,
    uint8_t** rxData,
    uint16_t** rvdLen,
    uint32_t fwt,
    uint32_t flags) {
    ReturnCode err;
    rfalTransceiveContext ctx;

    /*******************************************************************************/
    /* The Data Exchange is divided in two different moments, the trigger/Start of *
     *  the transfer followed by the check until its completion                    */
    if((gNfcDev.state >= RFAL_NFC_STATE_ACTIVATED) && (gNfcDev.activeDev != NULL)) {
        /*******************************************************************************/
        /* In Listen mode is the Poller that initiates the communicatation             */
        /* Assign output parameters and rfalNfcDataExchangeGetStatus will return       */
        /* incoming data from Poller/Initiator                                         */
        if((gNfcDev.state == RFAL_NFC_STATE_ACTIVATED) &&
           rfalNfcIsRemDevPoller(gNfcDev.activeDev->type)) {
            if(txDataLen > 0U) {
                return ERR_WRONG_STATE;
            }

            *rvdLen = (uint16_t*)&gNfcDev.rxLen;
            *rxData = (uint8_t*)(  (gNfcDev.activeDev->rfInterface == RFAL_NFC_INTERFACE_ISODEP) ? gNfcDev.rxBuf.isoDepBuf.apdu : 
                                  ((gNfcDev.activeDev->rfInterface == RFAL_NFC_INTERFACE_NFCDEP) ? gNfcDev.rxBuf.nfcDepBuf.pdu  : gNfcDev.rxBuf.rfBuf));
            if(gNfcDev.disc.activate_after_sak) {
                gNfcDev.state = RFAL_NFC_STATE_DATAEXCHANGE_DONE;
            }
            return ERR_NONE;
        }

        /*******************************************************************************/
        switch(gNfcDev.activeDev
                   ->rfInterface) /* Check which RF interface shall be used/has been activated */
        {
        /*******************************************************************************/
        case RFAL_NFC_INTERFACE_RF:
            ctx.rxBuf = gNfcDev.rxBuf.rfBuf;
            ctx.rxBufLen = 8 * sizeof(gNfcDev.rxBuf.rfBuf);
            ctx.rxRcvdLen = &gNfcDev.rxLen;
            ctx.txBuf = txData;
            ctx.txBufLen = txDataLen;
            ctx.flags = flags;
            ctx.fwt = fwt;
            *rxData = (uint8_t*)gNfcDev.rxBuf.rfBuf;
            *rvdLen = (uint16_t*)&gNfcDev.rxLen;
            err = rfalStartTransceive(&ctx);
            break;

#if RFAL_FEATURE_ISO_DEP
        /*******************************************************************************/
        case RFAL_NFC_INTERFACE_ISODEP: {
            rfalIsoDepApduTxRxParam isoDepTxRx;
            uint16_t tx_bytes = txDataLen / 8;

            if(tx_bytes > sizeof(gNfcDev.txBuf.isoDepBuf.apdu)) {
                return ERR_NOMEM;
            }

            if(tx_bytes > 0U) {
                ST_MEMCPY((uint8_t*)gNfcDev.txBuf.isoDepBuf.apdu, txData, tx_bytes);
            }

            isoDepTxRx.DID = RFAL_ISODEP_NO_DID;
            isoDepTxRx.ourFSx = RFAL_ISODEP_FSX_KEEP;
            isoDepTxRx.FSx = gNfcDev.activeDev->proto.isoDep.info.FSx;
            isoDepTxRx.dFWT = gNfcDev.activeDev->proto.isoDep.info.dFWT;
            isoDepTxRx.FWT = gNfcDev.activeDev->proto.isoDep.info.FWT;
            isoDepTxRx.txBuf = &gNfcDev.txBuf.isoDepBuf;
            isoDepTxRx.txBufLen = tx_bytes;
            isoDepTxRx.rxBuf = &gNfcDev.rxBuf.isoDepBuf;
            isoDepTxRx.rxLen = &gNfcDev.rxLen;
            isoDepTxRx.tmpBuf = &gNfcDev.tmpBuf.isoDepBuf;
            *rxData = (uint8_t*)gNfcDev.rxBuf.isoDepBuf.apdu;
            *rvdLen = (uint16_t*)&gNfcDev.rxLen;

            /*******************************************************************************/
            /* Trigger a RFAL ISO-DEP Transceive                                           */
            err = rfalIsoDepStartApduTransceive(isoDepTxRx);
            break;
        }
#endif /* RFAL_FEATURE_ISO_DEP */

#if RFAL_FEATURE_NFC_DEP
        /*******************************************************************************/
        case RFAL_NFC_INTERFACE_NFCDEP: {
            rfalNfcDepPduTxRxParam nfcDepTxRx;

            if(txDataLen > sizeof(gNfcDev.txBuf.nfcDepBuf.pdu)) {
                return ERR_NOMEM;
            }

            if(txDataLen > 0U) {
                ST_MEMCPY((uint8_t*)gNfcDev.txBuf.nfcDepBuf.pdu, txData, txDataLen);
            }

            nfcDepTxRx.DID = RFAL_NFCDEP_DID_KEEP;
            nfcDepTxRx.FSx =
                rfalNfcIsRemDevListener(gNfcDev.activeDev->type) ?
                    rfalNfcDepLR2FS((uint8_t)rfalNfcDepPP2LR(
                        gNfcDev.activeDev->proto.nfcDep.activation.Target.ATR_RES.PPt)) :
                    rfalNfcDepLR2FS((uint8_t)rfalNfcDepPP2LR(
                        gNfcDev.activeDev->proto.nfcDep.activation.Initiator.ATR_REQ.PPi));
            nfcDepTxRx.dFWT = gNfcDev.activeDev->proto.nfcDep.info.dFWT;
            nfcDepTxRx.FWT = gNfcDev.activeDev->proto.nfcDep.info.FWT;
            nfcDepTxRx.txBuf = &gNfcDev.txBuf.nfcDepBuf;
            nfcDepTxRx.txBufLen = txDataLen;
            nfcDepTxRx.rxBuf = &gNfcDev.rxBuf.nfcDepBuf;
            nfcDepTxRx.rxLen = &gNfcDev.rxLen;
            nfcDepTxRx.tmpBuf = &gNfcDev.tmpBuf.nfcDepBuf;
            *rxData = (uint8_t*)gNfcDev.rxBuf.nfcDepBuf.pdu;
            *rvdLen = (uint16_t*)&gNfcDev.rxLen;

            /*******************************************************************************/
            /* Trigger a RFAL NFC-DEP Transceive                                           */
            err = rfalNfcDepStartPduTransceive(nfcDepTxRx);
            break;
        }
#endif /* RFAL_FEATURE_NFC_DEP */

        /*******************************************************************************/
        default:
            err = ERR_PARAM;
            break;
        }

        /* If a transceive has succesfully started flag Data Exchange as ongoing */
        if(err == ERR_NONE) {
            gNfcDev.dataExErr = ERR_BUSY;
            gNfcDev.state = RFAL_NFC_STATE_DATAEXCHANGE;
        }

        return err;
    }

    return ERR_WRONG_STATE;
}

/*******************************************************************************/
ReturnCode rfalNfcDataExchangeGetStatus(void) {
    /*******************************************************************************/
    /* Check if it's the first frame received in Listen mode */
    if(gNfcDev.state == RFAL_NFC_STATE_ACTIVATED) {
        /* Continue data exchange as normal */
        gNfcDev.dataExErr = ERR_BUSY;
        gNfcDev.state = RFAL_NFC_STATE_DATAEXCHANGE;

        /* Check if we performing in T3T CE */
        if((gNfcDev.activeDev->type == RFAL_NFC_POLL_TYPE_NFCF) &&
           (gNfcDev.activeDev->rfInterface == RFAL_NFC_INTERFACE_RF)) {
            /* The first frame has been retrieved by rfalListenMode, flag data immediately                  */
            /* Can only call rfalGetTransceiveStatus() after starting a transceive with rfalStartTransceive */
            gNfcDev.dataExErr = ERR_NONE;
        }
    }

    /*******************************************************************************/
    /* Check if we are in we have been placed to sleep, and return last error     */
    if(gNfcDev.state == RFAL_NFC_STATE_LISTEN_SLEEP) {
        return gNfcDev.dataExErr; /* ERR_SLEEP_REQ */
    }

    /*******************************************************************************/
    /* Check if Data exchange has been started */
    if((gNfcDev.state != RFAL_NFC_STATE_DATAEXCHANGE) &&
       (gNfcDev.state != RFAL_NFC_STATE_DATAEXCHANGE_DONE)) {
        return ERR_WRONG_STATE;
    }

    /* Check if Data exchange is still ongoing */
    if(gNfcDev.dataExErr == ERR_BUSY) {
        switch(gNfcDev.activeDev->rfInterface) {
        /*******************************************************************************/
        case RFAL_NFC_INTERFACE_RF:
            gNfcDev.dataExErr = rfalGetTransceiveStatus();
            break;

#if RFAL_FEATURE_ISO_DEP
        /*******************************************************************************/
        case RFAL_NFC_INTERFACE_ISODEP:
            gNfcDev.dataExErr = rfalIsoDepGetApduTransceiveStatus();
            break;
#endif /* RFAL_FEATURE_ISO_DEP */

            /*******************************************************************************/
#if RFAL_FEATURE_NFC_DEP
        case RFAL_NFC_INTERFACE_NFCDEP:
            gNfcDev.dataExErr = rfalNfcDepGetPduTransceiveStatus();
            break;
#endif /* RFAL_FEATURE_NFC_DEP */

        /*******************************************************************************/
        default:
            gNfcDev.dataExErr = ERR_PARAM;
            break;
        }

#if RFAL_FEATURE_LISTEN_MODE
        /*******************************************************************************/
        /* If a Sleep request has been received (Listen Mode) go to sleep immediately  */
        if(gNfcDev.dataExErr == ERR_SLEEP_REQ) {
            EXIT_ON_ERR(
                gNfcDev.dataExErr,
                rfalListenSleepStart(
                    RFAL_LM_STATE_SLEEP_A,
                    gNfcDev.rxBuf.rfBuf,
                    sizeof(gNfcDev.rxBuf.rfBuf),
                    &gNfcDev.rxLen));

            /* If set Sleep was succesfull keep restore the Sleep request signal */
            gNfcDev.dataExErr = ERR_SLEEP_REQ;
        }
#endif /* RFAL_FEATURE_LISTEN_MODE */
    }

    return gNfcDev.dataExErr;
}

/*!
 ******************************************************************************
 * \brief Poller Technology Detection
 * 
 * This method implements the Technology Detection / Poll for different 
 * device technologies.
 * 
 * \return  ERR_NONE         : Operation completed with no error
 * \return  ERR_BUSY         : Operation ongoing
 * \return  ERR_XXXX         : Error occurred
 * 
 ******************************************************************************
 */
static ReturnCode rfalNfcPollTechDetetection(void) {
    ReturnCode err;

    err = ERR_NONE;

    /* Supress warning when specific RFAL features have been disabled */
    NO_WARNING(err);

    /*******************************************************************************/
    /* AP2P Technology Detection                                                   */
    /*******************************************************************************/
    if(((gNfcDev.disc.techs2Find & RFAL_NFC_POLL_TECH_AP2P) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_AP2P) != 0U)) {
#if RFAL_FEATURE_NFC_DEP

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(
                err,
                rfalSetMode(RFAL_MODE_POLL_ACTIVE_P2P, gNfcDev.disc.ap2pBR, gNfcDev.disc.ap2pBR));
            rfalSetErrorHandling(RFAL_ERRORHANDLING_NFC);
            rfalSetFDTListen(RFAL_FDT_LISTEN_AP2P_POLLER);
            rfalSetFDTPoll(RFAL_TIMING_NONE);
            rfalSetGT(RFAL_GT_AP2P_ADJUSTED);
            EXIT_ON_ERR(err, rfalFieldOnAndStartGT()); /* Turns the Field On and starts GT timer */
            gNfcDev.isTechInit = true;
        }

        if(rfalIsGTExpired()) /* Wait until Guard Time is fulfilled */
        {
            gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_AP2P;

            err = rfalNfcNfcDepActivate(
                gNfcDev.devList, RFAL_NFCDEP_COMM_ACTIVE, NULL, 0); /* Poll for NFC-A devices */
            if(err == ERR_NONE) {
                gNfcDev.techsFound |= RFAL_NFC_POLL_TECH_AP2P;

                gNfcDev.devList->type = RFAL_NFC_LISTEN_TYPE_AP2P;
                gNfcDev.devList->rfInterface = RFAL_NFC_INTERFACE_NFCDEP;
                gNfcDev.devCnt++;

                return ERR_NONE;
            }

            gNfcDev.isTechInit = false;
            rfalFieldOff();
        }
        return ERR_BUSY;

#endif /* RFAL_FEATURE_NFC_DEP */
    }

    /*******************************************************************************/
    /* Passive NFC-A Technology Detection                                          */
    /*******************************************************************************/
    if(((gNfcDev.disc.techs2Find & RFAL_NFC_POLL_TECH_A) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_A) != 0U)) {
#if RFAL_FEATURE_NFCA

        rfalNfcaSensRes sensRes;

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(err, rfalNfcaPollerInitialize()); /* Initialize RFAL for NFC-A */
            EXIT_ON_ERR(err, rfalFieldOnAndStartGT()); /* Turns the Field On and starts GT timer */
            gNfcDev.isTechInit = true;
        }

        if(rfalIsGTExpired()) /* Wait until Guard Time is fulfilled */
        {
            err = rfalNfcaPollerTechnologyDetection(
                gNfcDev.disc.compMode, &sensRes); /* Poll for NFC-A devices */
            if(err == ERR_NONE) {
                gNfcDev.techsFound |= RFAL_NFC_POLL_TECH_A;
            }

            gNfcDev.isTechInit = false;
            gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_A;
        }

        return ERR_BUSY;

#endif /* RFAL_FEATURE_NFCA */
    }

    /*******************************************************************************/
    /* Passive NFC-B Technology Detection                                          */
    /*******************************************************************************/
    if(((gNfcDev.disc.techs2Find & RFAL_NFC_POLL_TECH_B) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_B) != 0U)) {
#if RFAL_FEATURE_NFCB

        rfalNfcbSensbRes sensbRes;
        uint8_t sensbResLen;

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(err, rfalNfcbPollerInitialize()); /* Initialize RFAL for NFC-B */
            EXIT_ON_ERR(
                err, rfalFieldOnAndStartGT()); /* As field is already On only starts GT timer */
            gNfcDev.isTechInit = true;
        }

        if(rfalIsGTExpired()) /* Wait until Guard Time is fulfilled */
        {
            err = rfalNfcbPollerTechnologyDetection(
                gNfcDev.disc.compMode, &sensbRes, &sensbResLen); /* Poll for NFC-B devices */
            if(err == ERR_NONE) {
                gNfcDev.techsFound |= RFAL_NFC_POLL_TECH_B;
            }

            gNfcDev.isTechInit = false;
            gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_B;
        }

        return ERR_BUSY;

#endif /* RFAL_FEATURE_NFCB */
    }

    /*******************************************************************************/
    /* Passive NFC-F Technology Detection                                          */
    /*******************************************************************************/
    if(((gNfcDev.disc.techs2Find & RFAL_NFC_POLL_TECH_F) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_F) != 0U)) {
#if RFAL_FEATURE_NFCF

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(
                err,
                rfalNfcfPollerInitialize(gNfcDev.disc.nfcfBR)); /* Initialize RFAL for NFC-F */
            EXIT_ON_ERR(
                err, rfalFieldOnAndStartGT()); /* As field is already On only starts GT timer */
            gNfcDev.isTechInit = true;
        }

        if(rfalIsGTExpired()) /* Wait until Guard Time is fulfilled */
        {
            err = rfalNfcfPollerCheckPresence(); /* Poll for NFC-F devices */
            if(err == ERR_NONE) {
                gNfcDev.techsFound |= RFAL_NFC_POLL_TECH_F;
            }

            gNfcDev.isTechInit = false;
            gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_F;
        }

        return ERR_BUSY;

#endif /* RFAL_FEATURE_NFCF */
    }

    /*******************************************************************************/
    /* Passive NFC-V Technology Detection                                          */
    /*******************************************************************************/
    if(((gNfcDev.disc.techs2Find & RFAL_NFC_POLL_TECH_V) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_V) != 0U)) {
#if RFAL_FEATURE_NFCV

        rfalNfcvInventoryRes invRes;

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(err, rfalNfcvPollerInitialize()); /* Initialize RFAL for NFC-V */
            EXIT_ON_ERR(
                err, rfalFieldOnAndStartGT()); /* As field is already On only starts GT timer */
            gNfcDev.isTechInit = true;
        }

        if(rfalIsGTExpired()) /* Wait until Guard Time is fulfilled */
        {
            err = rfalNfcvPollerCheckPresence(&invRes); /* Poll for NFC-V devices */
            if(err == ERR_NONE) {
                gNfcDev.techsFound |= RFAL_NFC_POLL_TECH_V;
            }

            gNfcDev.isTechInit = false;
            gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_V;
        }

        return ERR_BUSY;

#endif /* RFAL_FEATURE_NFCV */
    }

    /*******************************************************************************/
    /* Passive Proprietary Technology ST25TB                                       */
    /*******************************************************************************/
    if(((gNfcDev.disc.techs2Find & RFAL_NFC_POLL_TECH_ST25TB) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_ST25TB) != 0U)) {
#if RFAL_FEATURE_ST25TB

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(err, rfalSt25tbPollerInitialize()); /* Initialize RFAL for NFC-V */
            EXIT_ON_ERR(
                err, rfalFieldOnAndStartGT()); /* As field is already On only starts GT timer */
            gNfcDev.isTechInit = true;
        }

        if(rfalIsGTExpired()) /* Wait until Guard Time is fulfilled */
        {
            err = rfalSt25tbPollerCheckPresence(NULL); /* Poll for ST25TB devices */
            if(err == ERR_NONE) {
                gNfcDev.techsFound |= RFAL_NFC_POLL_TECH_ST25TB;
            }

            gNfcDev.isTechInit = false;
            gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_ST25TB;
        }

        return ERR_BUSY;

#endif /* RFAL_FEATURE_ST25TB */
    }

    return ERR_NONE;
}

/*!
 ******************************************************************************
 * \brief Poller Collision Resolution
 * 
 * This method implements the Collision Resolution on all technologies that
 * have been detected before.
 * 
 * \return  ERR_NONE         : Operation completed with no error
 * \return  ERR_BUSY         : Operation ongoing
 * \return  ERR_XXXX         : Error occurred
 * 
 ******************************************************************************
 */
static ReturnCode rfalNfcPollCollResolution(void) {
    uint8_t i;
    static uint8_t devCnt;
    ReturnCode err;

    err = ERR_NONE;
    i = 0;

    /* Supress warning when specific RFAL features have been disabled */
    NO_WARNING(err);
    NO_WARNING(devCnt);
    NO_WARNING(i);

    /* Check if device limit has been reached */
    if(gNfcDev.devCnt >= gNfcDev.disc.devLimit) {
        return ERR_NONE;
    }

    /*******************************************************************************/
    /* NFC-A Collision Resolution                                                  */
    /*******************************************************************************/
#if RFAL_FEATURE_NFCA
    if(((gNfcDev.techsFound & RFAL_NFC_POLL_TECH_A) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_A) !=
        0U)) /* If a NFC-A device was found/detected, perform Collision Resolution */
    {
        static rfalNfcaListenDevice nfcaDevList[RFAL_NFC_MAX_DEVICES];

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(err, rfalNfcaPollerInitialize()); /* Initialize RFAL for NFC-A */
            EXIT_ON_ERR(err, rfalFieldOnAndStartGT()); /* Turns the Field On and starts GT timer */

            gNfcDev.isTechInit = true; /* Technology has been initialized */
            gNfcDev.isOperOngoing = false; /* No operation currently ongoing  */
        }

        if(!rfalIsGTExpired()) {
            return ERR_BUSY;
        }

        if(!gNfcDev.isOperOngoing) {
            EXIT_ON_ERR(
                err,
                rfalNfcaPollerStartFullCollisionResolution(
                    gNfcDev.disc.compMode,
                    (gNfcDev.disc.devLimit - gNfcDev.devCnt),
                    nfcaDevList,
                    &devCnt));

            gNfcDev.isOperOngoing = true;
            return ERR_BUSY;
        }

        err = rfalNfcaPollerGetFullCollisionResolutionStatus();
        if(err != ERR_BUSY) {
            gNfcDev.isTechInit = false;
            gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_A;

            if((err == ERR_NONE) && (devCnt != 0U)) {
                for(i = 0; i < devCnt;
                    i++) /* Copy devices found form local Nfca list into global device list */
                {
                    gNfcDev.devList[gNfcDev.devCnt].type = RFAL_NFC_LISTEN_TYPE_NFCA;
                    gNfcDev.devList[gNfcDev.devCnt].dev.nfca = nfcaDevList[i];
                    gNfcDev.devCnt++;
                }
            }
        }

        return ERR_BUSY;
    }
#endif /* RFAL_FEATURE_NFCA */

    /*******************************************************************************/
    /* NFC-B Collision Resolution                                                  */
    /*******************************************************************************/
#if RFAL_FEATURE_NFCB
    if(((gNfcDev.techsFound & RFAL_NFC_POLL_TECH_B) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_B) !=
        0U)) /* If a NFC-B device was found/detected, perform Collision Resolution */
    {
        rfalNfcbListenDevice nfcbDevList[RFAL_NFC_MAX_DEVICES];

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(err, rfalNfcbPollerInitialize()); /* Initialize RFAL for NFC-B */
            EXIT_ON_ERR(
                err,
                rfalFieldOnAndStartGT()); /* Ensure GT again as other technologies have also been polled */
            gNfcDev.isTechInit = true;
        }

        if(!rfalIsGTExpired()) {
            return ERR_BUSY;
        }

        devCnt = 0;
        gNfcDev.isTechInit = false;
        gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_B;

        err = rfalNfcbPollerCollisionResolution(
            gNfcDev.disc.compMode, (gNfcDev.disc.devLimit - gNfcDev.devCnt), nfcbDevList, &devCnt);
        if((err == ERR_NONE) && (devCnt != 0U)) {
            for(i = 0; i < devCnt;
                i++) /* Copy devices found form local Nfcb list into global device list */
            {
                gNfcDev.devList[gNfcDev.devCnt].type = RFAL_NFC_LISTEN_TYPE_NFCB;
                gNfcDev.devList[gNfcDev.devCnt].dev.nfcb = nfcbDevList[i];
                gNfcDev.devCnt++;
            }
        }

        return ERR_BUSY;
    }
#endif /* RFAL_FEATURE_NFCB*/

    /*******************************************************************************/
    /* NFC-F Collision Resolution                                                  */
    /*******************************************************************************/
#if RFAL_FEATURE_NFCF
    if(((gNfcDev.techsFound & RFAL_NFC_POLL_TECH_F) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_F) !=
        0U)) /* If a NFC-F device was found/detected, perform Collision Resolution */
    {
        rfalNfcfListenDevice nfcfDevList[RFAL_NFC_MAX_DEVICES];

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(
                err,
                rfalNfcfPollerInitialize(gNfcDev.disc.nfcfBR)); /* Initialize RFAL for NFC-F */
            EXIT_ON_ERR(
                err,
                rfalFieldOnAndStartGT()); /* Ensure GT again as other technologies have also been polled */
            gNfcDev.isTechInit = true;
        }

        if(!rfalIsGTExpired()) {
            return ERR_BUSY;
        }

        devCnt = 0;
        gNfcDev.isTechInit = false;
        gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_F;

        err = rfalNfcfPollerCollisionResolution(
            gNfcDev.disc.compMode, (gNfcDev.disc.devLimit - gNfcDev.devCnt), nfcfDevList, &devCnt);
        if((err == ERR_NONE) && (devCnt != 0U)) {
            for(i = 0; i < devCnt;
                i++) /* Copy devices found form local Nfcf list into global device list */
            {
                gNfcDev.devList[gNfcDev.devCnt].type = RFAL_NFC_LISTEN_TYPE_NFCF;
                gNfcDev.devList[gNfcDev.devCnt].dev.nfcf = nfcfDevList[i];
                gNfcDev.devCnt++;
            }
        }

        return ERR_BUSY;
    }
#endif /* RFAL_FEATURE_NFCF */

    /*******************************************************************************/
    /* NFC-V Collision Resolution                                                  */
    /*******************************************************************************/
#if RFAL_FEATURE_NFCV
    if(((gNfcDev.techsFound & RFAL_NFC_POLL_TECH_V) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_V) !=
        0U)) /* If a NFC-V device was found/detected, perform Collision Resolution */
    {
        rfalNfcvListenDevice nfcvDevList[RFAL_NFC_MAX_DEVICES];

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(err, rfalNfcvPollerInitialize()); /* Initialize RFAL for NFC-V */
            EXIT_ON_ERR(
                err,
                rfalFieldOnAndStartGT()); /* Ensure GT again as other technologies have also been polled */
            gNfcDev.isTechInit = true;
        }

        if(!rfalIsGTExpired()) {
            return ERR_BUSY;
        }

        devCnt = 0;
        gNfcDev.isTechInit = false;
        gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_V;

        err = rfalNfcvPollerCollisionResolution(
            RFAL_COMPLIANCE_MODE_NFC,
            (gNfcDev.disc.devLimit - gNfcDev.devCnt),
            nfcvDevList,
            &devCnt);
        if((err == ERR_NONE) && (devCnt != 0U)) {
            for(i = 0; i < devCnt;
                i++) /* Copy devices found form local Nfcf list into global device list */
            {
                gNfcDev.devList[gNfcDev.devCnt].type = RFAL_NFC_LISTEN_TYPE_NFCV;
                gNfcDev.devList[gNfcDev.devCnt].dev.nfcv = nfcvDevList[i];
                gNfcDev.devCnt++;
            }
        }

        return ERR_BUSY;
    }
#endif /* RFAL_FEATURE_NFCV */

    /*******************************************************************************/
    /* ST25TB Collision Resolution                                                 */
    /*******************************************************************************/
#if RFAL_FEATURE_ST25TB
    if(((gNfcDev.techsFound & RFAL_NFC_POLL_TECH_ST25TB) != 0U) &&
       ((gNfcDev.techs2do & RFAL_NFC_POLL_TECH_ST25TB) !=
        0U)) /* If a ST25TB device was found/detected, perform Collision Resolution */
    {
        rfalSt25tbListenDevice st25tbDevList[RFAL_NFC_MAX_DEVICES];

        if(!gNfcDev.isTechInit) {
            EXIT_ON_ERR(err, rfalSt25tbPollerInitialize()); /* Initialize RFAL for ST25TB */
            EXIT_ON_ERR(
                err,
                rfalFieldOnAndStartGT()); /* Ensure GT again as other technologies have also been polled */
            gNfcDev.isTechInit = true;
        }

        if(!rfalIsGTExpired()) {
            return ERR_BUSY;
        }

        devCnt = 0;
        gNfcDev.isTechInit = false;
        gNfcDev.techs2do &= ~RFAL_NFC_POLL_TECH_ST25TB;

        err = rfalSt25tbPollerCollisionResolution(
            (gNfcDev.disc.devLimit - gNfcDev.devCnt), st25tbDevList, &devCnt);
        if((err == ERR_NONE) && (devCnt != 0U)) {
            for(i = 0; i < devCnt;
                i++) /* Copy devices found form local Nfcf list into global device list */
            {
                gNfcDev.devList[gNfcDev.devCnt].type = RFAL_NFC_LISTEN_TYPE_ST25TB;
                gNfcDev.devList[gNfcDev.devCnt].dev.st25tb = st25tbDevList[i];
                gNfcDev.devCnt++;
            }
        }

        return ERR_BUSY;
    }
#endif /* RFAL_FEATURE_ST25TB */

    return ERR_NONE; /* All technologies have been performed */
}

/*!
 ******************************************************************************
 * \brief Poller Activation
 * 
 * This method Activates a given device according to it's type and 
 * protocols supported
 *  
 * \param[in]  devIt : device's position on the list to be activated 
 * 
 * \return  ERR_NONE         : Operation completed with no error
 * \return  ERR_BUSY         : Operation ongoing
 * \return  ERR_XXXX         : Error occurred
 * 
 ******************************************************************************
 */
static ReturnCode rfalNfcPollActivation(uint8_t devIt) {
    ReturnCode err;

    err = ERR_NONE;

    /* Supress warning when specific RFAL features have been disabled */
    NO_WARNING(err);

    if(devIt > gNfcDev.devCnt) {
        return ERR_WRONG_STATE;
    }

    switch(gNfcDev.devList[devIt].type) {
        /*******************************************************************************/
        /* AP2P Activation                                                             */
        /*******************************************************************************/
#if RFAL_FEATURE_NFC_DEP
    case RFAL_NFC_LISTEN_TYPE_AP2P:
        /* Activation has already been perfomed (ATR_REQ) */

        gNfcDev.devList[devIt].nfcid =
            gNfcDev.devList[devIt].proto.nfcDep.activation.Target.ATR_RES.NFCID3;
        gNfcDev.devList[devIt].nfcidLen = RFAL_NFCDEP_NFCID3_LEN;
        break;
#endif /* RFAL_FEATURE_NFC_DEP */

        /*******************************************************************************/
        /* Passive NFC-A Activation                                                    */
        /*******************************************************************************/
#if RFAL_FEATURE_NFCA
    case RFAL_NFC_LISTEN_TYPE_NFCA:

        if(!gNfcDev.isTechInit) {
            rfalNfcaPollerInitialize();
            gNfcDev.isTechInit = true;
            gNfcDev.isOperOngoing = false;
            return ERR_BUSY;
        }

        if(gNfcDev.devList[devIt].dev.nfca.isSleep) /* Check if desired device is in Sleep */
        {
            rfalNfcaSensRes sensRes;
            rfalNfcaSelRes selRes;

            if(!gNfcDev.isOperOngoing) {
                /* Wake up all cards  */
                EXIT_ON_ERR(
                    err, rfalNfcaPollerCheckPresence(RFAL_14443A_SHORTFRAME_CMD_WUPA, &sensRes));
                gNfcDev.isOperOngoing = true;
            } else {
                /* Select specific device */
                EXIT_ON_ERR(
                    err,
                    rfalNfcaPollerSelect(
                        gNfcDev.devList[devIt].dev.nfca.nfcId1,
                        gNfcDev.devList[devIt].dev.nfca.nfcId1Len,
                        &selRes));
                gNfcDev.devList[devIt].dev.nfca.isSleep = false;
                gNfcDev.isOperOngoing = false;
            }
            return ERR_BUSY;
        }

        /* Set NFCID */
        gNfcDev.devList[devIt].nfcid = gNfcDev.devList[devIt].dev.nfca.nfcId1;
        gNfcDev.devList[devIt].nfcidLen = gNfcDev.devList[devIt].dev.nfca.nfcId1Len;

        /*******************************************************************************/
        /* Perform protocol specific activation                                        */
        switch(gNfcDev.devList[devIt].dev.nfca.type) {
        /*******************************************************************************/
        case RFAL_NFCA_T1T:

            /* No further activation needed for T1T (RID already performed) */

            gNfcDev.devList[devIt].nfcid = gNfcDev.devList[devIt].dev.nfca.ridRes.uid;
            gNfcDev.devList[devIt].nfcidLen = RFAL_T1T_UID_LEN;

            gNfcDev.devList[devIt].rfInterface = RFAL_NFC_INTERFACE_RF;
            break;

        case RFAL_NFCA_T2T:

            /* No further activation needed for a T2T */

            gNfcDev.devList[devIt].rfInterface = RFAL_NFC_INTERFACE_RF;
            break;

        /*******************************************************************************/
        case RFAL_NFCA_T4T: /* Device supports ISO-DEP */

#if RFAL_FEATURE_ISO_DEP && RFAL_FEATURE_ISO_DEP_POLL
            if(!gNfcDev.isOperOngoing) {
                /* Perform ISO-DEP (ISO14443-4) activation: RATS and PPS if supported */
                rfalIsoDepInitialize();
                EXIT_ON_ERR(
                    err,
                    rfalIsoDepPollAStartActivation(
                        (rfalIsoDepFSxI)RFAL_ISODEP_FSDI_DEFAULT,
                        RFAL_ISODEP_NO_DID,
                        gNfcDev.disc.maxBR,
                        &gNfcDev.devList[devIt].proto.isoDep));

                gNfcDev.isOperOngoing = true;
                return ERR_BUSY;
            }

            err = rfalIsoDepPollAGetActivationStatus();
            if(err != ERR_NONE) {
                return err;
            }

            gNfcDev.devList[devIt].rfInterface =
                RFAL_NFC_INTERFACE_ISODEP; /* NFC-A T4T device activated */
#else
            gNfcDev.devList[devIt].rfInterface =
                RFAL_NFC_INTERFACE_RF; /* No ISO-DEP supported activate using RF interface */
#endif /* RFAL_FEATURE_ISO_DEP_POLL */
            break;

        /*******************************************************************************/
        case RFAL_NFCA_T4T_NFCDEP: /* Device supports both T4T and NFC-DEP */
        case RFAL_NFCA_NFCDEP: /* Device supports NFC-DEP */

#if RFAL_FEATURE_NFC_DEP
            /* Perform NFC-DEP (P2P) activation: ATR and PSL if supported */
            EXIT_ON_ERR(
                err,
                rfalNfcNfcDepActivate(&gNfcDev.devList[devIt], RFAL_NFCDEP_COMM_PASSIVE, NULL, 0));

            gNfcDev.devList[devIt].nfcid =
                gNfcDev.devList[devIt].proto.nfcDep.activation.Target.ATR_RES.NFCID3;
            gNfcDev.devList[devIt].nfcidLen = RFAL_NFCDEP_NFCID3_LEN;

            gNfcDev.devList[devIt].rfInterface =
                RFAL_NFC_INTERFACE_NFCDEP; /* NFC-A P2P device activated */
#else
            gNfcDev.devList[devIt].rfInterface =
                RFAL_NFC_INTERFACE_RF; /* No NFC-DEP supported activate using RF interface */
#endif /* RFAL_FEATURE_NFC_DEP */
            break;

        /*******************************************************************************/
        default:
            return ERR_WRONG_STATE;
        }
        break;
#endif /* RFAL_FEATURE_NFCA */

        /*******************************************************************************/
        /* Passive NFC-B Activation                                                    */
        /*******************************************************************************/
#if RFAL_FEATURE_NFCB
    case RFAL_NFC_LISTEN_TYPE_NFCB:

        if(!gNfcDev.isTechInit) {
            rfalNfcbPollerInitialize();
            gNfcDev.isTechInit = true;
            gNfcDev.isOperOngoing = false;
            return ERR_BUSY;
        }

        if(gNfcDev.devList[devIt].dev.nfcb.isSleep) /* Check if desired device is in Sleep */
        {
            rfalNfcbSensbRes sensbRes;
            uint8_t sensbResLen;

            /* Wake up all cards. SENSB_RES may return collision but the NFCID0 is available to explicitly select NFC-B card via ATTRIB; so error will be ignored here */
            rfalNfcbPollerCheckPresence(
                RFAL_NFCB_SENS_CMD_ALLB_REQ, RFAL_NFCB_SLOT_NUM_1, &sensbRes, &sensbResLen);
        }

        /* Set NFCID */
        gNfcDev.devList[devIt].nfcid = gNfcDev.devList[devIt].dev.nfcb.sensbRes.nfcid0;
        gNfcDev.devList[devIt].nfcidLen = RFAL_NFCB_NFCID0_LEN;

#if RFAL_FEATURE_ISO_DEP && RFAL_FEATURE_ISO_DEP_POLL
        /* Check if device supports  ISO-DEP (ISO14443-4) */
        if((gNfcDev.devList[devIt].dev.nfcb.sensbRes.protInfo.FsciProType &
            RFAL_NFCB_SENSB_RES_PROTO_ISO_MASK) != 0U) {
            if(!gNfcDev.isOperOngoing) {
                rfalIsoDepInitialize();
                /* Perform ISO-DEP (ISO14443-4) activation: ATTRIB    */
                EXIT_ON_ERR(
                    err,
                    rfalIsoDepPollBStartActivation(
                        (rfalIsoDepFSxI)RFAL_ISODEP_FSDI_DEFAULT,
                        RFAL_ISODEP_NO_DID,
                        gNfcDev.disc.maxBR,
                        0x00,
                        &gNfcDev.devList[devIt].dev.nfcb,
                        NULL,
                        0,
                        &gNfcDev.devList[devIt].proto.isoDep));

                gNfcDev.isOperOngoing = true;
                return ERR_BUSY;
            }

            err = rfalIsoDepPollBGetActivationStatus();
            if(err != ERR_NONE) {
                return err;
            }

            gNfcDev.devList[devIt].rfInterface =
                RFAL_NFC_INTERFACE_ISODEP; /* NFC-B T4T device activated */
            break;
        }

#endif /* RFAL_FEATURE_ISO_DEP_POLL */

        gNfcDev.devList[devIt].rfInterface =
            RFAL_NFC_INTERFACE_RF; /* NFC-B device activated     */
        break;

#endif /* RFAL_FEATURE_NFCB */

        /*******************************************************************************/
        /* Passive NFC-F Activation                                                    */
        /*******************************************************************************/
#if RFAL_FEATURE_NFCF
    case RFAL_NFC_LISTEN_TYPE_NFCF:

        rfalNfcfPollerInitialize(gNfcDev.disc.nfcfBR);

#if RFAL_FEATURE_NFC_DEP
        if(rfalNfcfIsNfcDepSupported(&gNfcDev.devList[devIt].dev.nfcf)) {
            /* Perform NFC-DEP (P2P) activation: ATR and PSL if supported */
            EXIT_ON_ERR(
                err,
                rfalNfcNfcDepActivate(&gNfcDev.devList[devIt], RFAL_NFCDEP_COMM_PASSIVE, NULL, 0));

            /* Set NFCID */
            gNfcDev.devList[devIt].nfcid =
                gNfcDev.devList[devIt].proto.nfcDep.activation.Target.ATR_RES.NFCID3;
            gNfcDev.devList[devIt].nfcidLen = RFAL_NFCDEP_NFCID3_LEN;

            gNfcDev.devList[devIt].rfInterface =
                RFAL_NFC_INTERFACE_NFCDEP; /* NFC-F P2P device activated */
            break;
        }
#endif /* RFAL_FEATURE_NFC_DEP */

        /* Set NFCID */
        gNfcDev.devList[devIt].nfcid = gNfcDev.devList[devIt].dev.nfcf.sensfRes.NFCID2;
        gNfcDev.devList[devIt].nfcidLen = RFAL_NFCF_NFCID2_LEN;

        gNfcDev.devList[devIt].rfInterface =
            RFAL_NFC_INTERFACE_RF; /* NFC-F T3T device activated */
        break;
#endif /* RFAL_FEATURE_NFCF */

        /*******************************************************************************/
        /* Passive NFC-V Activation                                                    */
        /*******************************************************************************/
#if RFAL_FEATURE_NFCV
    case RFAL_NFC_LISTEN_TYPE_NFCV:

        rfalNfcvPollerInitialize();

        /* No specific activation needed for a T5T */

        /* Set NFCID */
        gNfcDev.devList[devIt].nfcid = gNfcDev.devList[devIt].dev.nfcv.InvRes.UID;
        gNfcDev.devList[devIt].nfcidLen = RFAL_NFCV_UID_LEN;

        gNfcDev.devList[devIt].rfInterface =
            RFAL_NFC_INTERFACE_RF; /* NFC-V T5T device activated */
        break;
#endif /* RFAL_FEATURE_NFCV */

        /*******************************************************************************/
        /* Passive ST25TB Activation                                                   */
        /*******************************************************************************/
#if RFAL_FEATURE_ST25TB
    case RFAL_NFC_LISTEN_TYPE_ST25TB:

        rfalSt25tbPollerInitialize();

        /* No specific activation needed for a ST25TB */

        /* Set NFCID */
        gNfcDev.devList[devIt].nfcid = gNfcDev.devList[devIt].dev.st25tb.UID;
        gNfcDev.devList[devIt].nfcidLen = RFAL_ST25TB_UID_LEN;

        gNfcDev.devList[devIt].rfInterface = RFAL_NFC_INTERFACE_RF; /* ST25TB device activated */
        break;
#endif /* RFAL_FEATURE_ST25TB */

    /*******************************************************************************/
    default:
        return ERR_WRONG_STATE;
    }

    gNfcDev.activeDev = &gNfcDev.devList[devIt]; /* Assign active device to be used further on */
    return ERR_NONE;
}

/*!
 ******************************************************************************
 * \brief Listener Activation
 * 
 * This method handles the listen mode Activation according to the different 
 * protocols the Reader/Initiator performs
 * 
 * \return  ERR_NONE   : Operation completed with no error
 * \return  ERR_BUSY   : Operation ongoing
 * \return  ERR_PROTO  : Unexpected frame received
 * \return  ERR_XXXX   : Error occurred
 * 
 ******************************************************************************
 */
#if RFAL_FEATURE_LISTEN_MODE
static ReturnCode rfalNfcListenActivation(void) {
    bool isDataRcvd;
    ReturnCode ret;
    rfalLmState lmSt;
    rfalBitRate bitRate;
#if RFAL_FEATURE_NFC_DEP
    uint8_t hdrLen;

    /* Set the header length in NFC-A */
    hdrLen = (RFAL_NFCDEP_SB_LEN + RFAL_NFCDEP_LEN_LEN);
#endif /* RFAL_FEATURE_NFC_DEP */

    lmSt = rfalListenGetState(&isDataRcvd, &bitRate);

    switch(lmSt) {
#if RFAL_FEATURE_NFCA
    /*******************************************************************************/
    case RFAL_LM_STATE_ACTIVE_A: /* NFC-A CE activation */
    case RFAL_LM_STATE_ACTIVE_Ax:

        if(isDataRcvd) /* Check if Reader/Initator has sent some data */
        {
            /* Check if received data is a Sleep request */
            if(rfalNfcaListenerIsSleepReq(
                   gNfcDev.rxBuf.rfBuf,
                   rfalConvBitsToBytes(gNfcDev.rxLen))) /* Check if received data is a SLP_REQ */
            {
                /* Set the Listen Mode in Sleep state */
                EXIT_ON_ERR(
                    ret,
                    rfalListenSleepStart(
                        RFAL_LM_STATE_SLEEP_A,
                        gNfcDev.rxBuf.rfBuf,
                        sizeof(gNfcDev.rxBuf.rfBuf),
                        &gNfcDev.rxLen));
            }

            else if(gNfcDev.disc.activate_after_sak) {
                gNfcDev.devList->type = RFAL_NFC_POLL_TYPE_NFCA;
                rfalListenSetState(RFAL_LM_STATE_ACTIVE_A);
                return ERR_NONE;
            }
#if RFAL_FEATURE_ISO_DEP && RFAL_FEATURE_ISO_DEP_LISTEN
            /* Check if received data is a valid RATS */
            else if(rfalIsoDepIsRats(
                        gNfcDev.rxBuf.rfBuf, (uint8_t)rfalConvBitsToBytes(gNfcDev.rxLen))) {
                rfalIsoDepAtsParam atsParam;
                rfalIsoDepListenActvParam rxParam;

                /* Set ATS parameters */
                atsParam.fsci = (uint8_t)RFAL_ISODEP_DEFAULT_FSCI;
                atsParam.fwi = RFAL_ISODEP_DEFAULT_FWI;
                atsParam.sfgi = RFAL_ISODEP_DEFAULT_SFGI;
                atsParam.didSupport = false;
                atsParam.ta = RFAL_ISODEP_ATS_TA_SAME_D;
                atsParam.hb = NULL;
                atsParam.hbLen = 0;

                /* Set Rx parameters */
                rxParam.rxBuf =
                    (rfalIsoDepBufFormat*)&gNfcDev.rxBuf
                        .isoDepBuf; /*  PRQA S 0310 # MISRA 11.3 - Intentional safe cast to avoiding large buffer duplication */
                rxParam.rxLen = &gNfcDev.rxLen;
                rxParam.isoDepDev = &gNfcDev.devList->proto.isoDep;
                rxParam.isRxChaining = &gNfcDev.isRxChaining;

                rfalListenSetState(RFAL_LM_STATE_CARDEMU_4A); /* Set next state CE T4T */
                rfalIsoDepInitialize(); /* Initialize ISO-DEP layer to handle ISO14443-a activation / RATS */

                /* Set ISO-DEP layer to digest RATS and handle activation */
                EXIT_ON_ERR(
                    ret,
                    rfalIsoDepListenStartActivation(
                        &atsParam, NULL, gNfcDev.rxBuf.rfBuf, gNfcDev.rxLen, rxParam));
            }
#endif /* RFAL_FEATURE_ISO_DEP_LISTEN */

#if RFAL_FEATURE_NFC_DEP

            /* Check if received data is a valid ATR_REQ */
            else if(rfalNfcDepIsAtrReq(
                        &gNfcDev.rxBuf.rfBuf[hdrLen],
                        (rfalConvBitsToBytes(gNfcDev.rxLen) - hdrLen),
                        gNfcDev.devList->nfcid)) {
                gNfcDev.devList->type = RFAL_NFC_POLL_TYPE_NFCA;
                EXIT_ON_ERR(
                    ret,
                    rfalNfcNfcDepActivate(
                        gNfcDev.devList,
                        RFAL_NFCDEP_COMM_PASSIVE,
                        &gNfcDev.rxBuf.rfBuf[hdrLen],
                        (rfalConvBitsToBytes(gNfcDev.rxLen) - hdrLen)));
            }
#endif /* RFAL_FEATURE_NFC_DEP */

            else {
                return ERR_PROTO;
            }
        }
        return ERR_BUSY;

#endif /* RFAL_FEATURE_NFCA */

#if RFAL_FEATURE_ISO_DEP && RFAL_FEATURE_ISO_DEP_LISTEN
    /*******************************************************************************/
    case RFAL_LM_STATE_CARDEMU_4A: /* T4T ISO-DEP activation */

        ret = rfalIsoDepListenGetActivationStatus();
        if(ret == ERR_NONE) {
            gNfcDev.devList->type = RFAL_NFC_POLL_TYPE_NFCA;
            gNfcDev.devList->rfInterface = RFAL_NFC_INTERFACE_ISODEP;
            gNfcDev.devList->nfcid = NULL;
            gNfcDev.devList->nfcidLen = 0;
        }
        return ret;
#endif /* RFAL_FEATURE_ISO_DEP_LISTEN */

    /*******************************************************************************/
    case RFAL_LM_STATE_READY_F: /* NFC-F CE activation */

        if(isDataRcvd) /* Wait for the first received data */
        {
#if RFAL_FEATURE_NFC_DEP
            /* Set the header length in NFC-F */
            hdrLen = RFAL_NFCDEP_LEN_LEN;

            if(rfalNfcDepIsAtrReq(
                   &gNfcDev.rxBuf.rfBuf[hdrLen],
                   (rfalConvBitsToBytes(gNfcDev.rxLen) - hdrLen),
                   gNfcDev.devList->nfcid)) {
                gNfcDev.devList->type = RFAL_NFC_POLL_TYPE_NFCF;
                EXIT_ON_ERR(
                    ret,
                    rfalNfcNfcDepActivate(
                        gNfcDev.devList,
                        RFAL_NFCDEP_COMM_PASSIVE,
                        &gNfcDev.rxBuf.rfBuf[hdrLen],
                        (rfalConvBitsToBytes(gNfcDev.rxLen) - hdrLen)));
            } else
#endif /* RFAL_FEATURE_NFC_DEP */
            {
                rfalListenSetState(
                    RFAL_LM_STATE_CARDEMU_3); /* First data already received - set T3T CE */
            }
        }
        return ERR_BUSY;

    /*******************************************************************************/
    case RFAL_LM_STATE_CARDEMU_3: /* T3T activated */

        gNfcDev.devList->type = RFAL_NFC_POLL_TYPE_NFCF;
        gNfcDev.devList->rfInterface = RFAL_NFC_INTERFACE_RF;
        gNfcDev.devList->nfcid = NULL;
        gNfcDev.devList->nfcidLen = 0;

        return ERR_NONE;

#if RFAL_FEATURE_NFC_DEP
    /*******************************************************************************/
    case RFAL_LM_STATE_TARGET_A: /* NFC-DEP activation */
    case RFAL_LM_STATE_TARGET_F:

        ret = rfalNfcDepListenGetActivationStatus();
        if(ret == ERR_NONE) {
            gNfcDev.devList->rfInterface = RFAL_NFC_INTERFACE_NFCDEP;
            gNfcDev.devList->nfcidLen = RFAL_NFCDEP_NFCID3_LEN;
        }
        return ret;
#endif /* RFAL_FEATURE_NFC_DEP */

    /*******************************************************************************/
    case RFAL_LM_STATE_IDLE: /* AP2P activation */
        if(isDataRcvd) /* Check if Reader/Initator has sent some data */
        {
            if((gNfcDev.lmMask & RFAL_LM_MASK_ACTIVE_P2P) != 0U) /* Check if AP2P is enabled */
            {
#if RFAL_FEATURE_NFC_DEP
                /* Calculate the header length in NFC-A or NFC-F mode*/
                hdrLen =
                    ((bitRate == RFAL_BR_106) ? (RFAL_NFCDEP_SB_LEN + RFAL_NFCDEP_LEN_LEN) :
                                                RFAL_NFCDEP_LEN_LEN);

                if(rfalNfcDepIsAtrReq(
                       &gNfcDev.rxBuf.rfBuf[hdrLen],
                       (rfalConvBitsToBytes(gNfcDev.rxLen) - hdrLen),
                       NULL)) {
                    gNfcDev.devList->type = RFAL_NFC_POLL_TYPE_AP2P;
                    rfalSetMode((RFAL_MODE_LISTEN_ACTIVE_P2P), bitRate, bitRate);
                    EXIT_ON_ERR(
                        ret,
                        rfalNfcNfcDepActivate(
                            gNfcDev.devList,
                            RFAL_NFCDEP_COMM_ACTIVE,
                            &gNfcDev.rxBuf.rfBuf[hdrLen],
                            (rfalConvBitsToBytes(gNfcDev.rxLen) - hdrLen)));
                } else
#endif /* RFAL_FEATURE_NFC_DEP */
                {
                    return ERR_PROTO;
                }
            }
        }
        return ERR_BUSY;

    /*******************************************************************************/
    case RFAL_LM_STATE_READY_A:
    case RFAL_LM_STATE_READY_Ax:
    case RFAL_LM_STATE_SLEEP_A:
    case RFAL_LM_STATE_SLEEP_AF:
        return ERR_BUSY;

    /*******************************************************************************/
    case RFAL_LM_STATE_POWER_OFF:
        return ERR_LINK_LOSS;

    default: /* Wait for activation */
        break;
    }

    return ERR_INTERNAL;
}
#endif /* RFAL_FEATURE_LISTEN_MODE */

/*!
 ******************************************************************************
 * \brief Poller NFC DEP Activate
 * 
 * This method performs NFC-DEP Activation 
 *  
 * \param[in]  device    : device info
 * \param[in]  commMode  : communication mode (Passive/Active)
 * \param[in]  atrReq    : received ATR_REQ
 * \param[in]  atrReqLen : received ATR_REQ size
 * 
 * \return  ERR_NONE     : Operation completed with no error
 * \return  ERR_BUSY     : Operation ongoing
 * \return  ERR_XXXX     : Error occurred
 * 
 ******************************************************************************
 */
#if RFAL_FEATURE_NFC_DEP
static ReturnCode rfalNfcNfcDepActivate(
    rfalNfcDevice* device,
    rfalNfcDepCommMode commMode,
    const uint8_t* atrReq,
    uint16_t atrReqLen) {
    rfalNfcDepAtrParam initParam;

    /* Supress warnings if Listen mode is disabled */
    NO_WARNING(atrReq);
    NO_WARNING(atrReqLen);

    /* If we are in Poll mode */
    if(rfalNfcIsRemDevListener(device->type)) {
        /*******************************************************************************/
        /* If Passive F use the NFCID2 retrieved from SENSF                            */
        if(device->type == RFAL_NFC_LISTEN_TYPE_NFCF) {
            initParam.nfcid = device->dev.nfcf.sensfRes.NFCID2;
            initParam.nfcidLen = RFAL_NFCF_NFCID2_LEN;
        } else {
            initParam.nfcid = gNfcDev.disc.nfcid3;
            initParam.nfcidLen = RFAL_NFCDEP_NFCID3_LEN;
        }

        initParam.BS = RFAL_NFCDEP_Bx_NO_HIGH_BR;
        initParam.BR = RFAL_NFCDEP_Bx_NO_HIGH_BR;
        initParam.DID = RFAL_NFCDEP_DID_NO;
        initParam.NAD = RFAL_NFCDEP_NAD_NO;
        initParam.LR = RFAL_NFCDEP_LR_254;
        initParam.GB = gNfcDev.disc.GB;
        initParam.GBLen = gNfcDev.disc.GBLen;
        initParam.commMode = commMode;
        initParam.operParam =
            (RFAL_NFCDEP_OPER_FULL_MI_EN | RFAL_NFCDEP_OPER_EMPTY_DEP_DIS |
             RFAL_NFCDEP_OPER_ATN_EN | RFAL_NFCDEP_OPER_RTOX_REQ_EN);

        rfalNfcDepInitialize();
        /* Perform NFC-DEP (P2P) activation: ATR and PSL if supported */
        return rfalNfcDepInitiatorHandleActivation(
            &initParam, gNfcDev.disc.maxBR, &device->proto.nfcDep);
    }
    /* If we are in Listen mode */
#if RFAL_FEATURE_LISTEN_MODE
    else if(rfalNfcIsRemDevPoller(device->type)) {
        rfalNfcDepListenActvParam actvParams;
        rfalNfcDepTargetParam targetParam;

        ST_MEMCPY(targetParam.nfcid3, (uint8_t*)gNfcDev.disc.nfcid3, RFAL_NFCDEP_NFCID3_LEN);
        targetParam.bst = RFAL_NFCDEP_Bx_NO_HIGH_BR;
        targetParam.brt = RFAL_NFCDEP_Bx_NO_HIGH_BR;
        targetParam.to = RFAL_NFCDEP_WT_TRG_MAX_L13; /* [LLCP] 1.3 6.2.1 */
        targetParam.ppt = rfalNfcDepLR2PP(RFAL_NFCDEP_LR_254);
        if(gNfcDev.disc.GBLen >= RFAL_NFCDEP_GB_MAX_LEN) {
            return ERR_PARAM;
        }
        targetParam.GBtLen = gNfcDev.disc.GBLen;
        if(gNfcDev.disc.GBLen > 0U) {
            ST_MEMCPY(targetParam.GBt, gNfcDev.disc.GB, gNfcDev.disc.GBLen);
        }
        targetParam.operParam =
            (RFAL_NFCDEP_OPER_FULL_MI_EN | RFAL_NFCDEP_OPER_EMPTY_DEP_DIS |
             RFAL_NFCDEP_OPER_ATN_EN | RFAL_NFCDEP_OPER_RTOX_REQ_EN);
        targetParam.commMode = commMode;

        /* Set activation buffer (including header) for NFC-DEP */
        actvParams.rxBuf =
            (rfalNfcDepBufFormat*)&gNfcDev.rxBuf
                .nfcDepBuf; /*  PRQA S 0310 # MISRA 11.3 - Intentional safe cast to avoiding large buffer duplication */
        actvParams.rxLen = &gNfcDev.rxLen;
        actvParams.isRxChaining = &gNfcDev.isRxChaining;
        actvParams.nfcDepDev = &gNfcDev.devList->proto.nfcDep;

        rfalListenSetState(
            ((device->type == RFAL_NFC_POLL_TYPE_NFCA) ? RFAL_LM_STATE_TARGET_A :
                                                         RFAL_LM_STATE_TARGET_F));

        rfalNfcDepInitialize();
        /* Perform NFC-DEP (P2P) activation: send ATR_RES and handle activation */
        return rfalNfcDepListenStartActivation(&targetParam, atrReq, atrReqLen, actvParams);
    }
#endif /* RFAL_FEATURE_LISTEN_MODE */

    else {
        return ERR_INTERNAL;
    }
}
#endif /* RFAL_FEATURE_NFC_DEP */

/*!
 ******************************************************************************
 * \brief Poller NFC Deactivate
 * 
 * This method Deactivates the device if a deactivation procedure exists 
 * 
 * \return  ERR_NONE  : Operation completed with no error
 * \return  ERR_BUSY  : Operation ongoing
 * \return  ERR_XXXX  : Error occurred
 * 
 ******************************************************************************
 */
static ReturnCode rfalNfcDeactivation(void) {
    /* Check if a device has been activated */
    if(gNfcDev.activeDev != NULL) {
        if(rfalNfcIsRemDevListener(
               gNfcDev.activeDev->type)) /* Listen mode no additional deactivation to be performed*/
        {
#ifndef RFAL_NFC_SKIP_DEACT
            switch(gNfcDev.activeDev->rfInterface) {
            /*******************************************************************************/
            case RFAL_NFC_INTERFACE_RF:
                break; /* No specific deactivation to be performed */

                /*******************************************************************************/
#if RFAL_FEATURE_ISO_DEP && RFAL_FEATURE_ISO_DEP_POLL
            case RFAL_NFC_INTERFACE_ISODEP:
                rfalIsoDepDeselect(); /* Send a Deselect to device */
                break;
#endif /* RFAL_FEATURE_ISO_DEP_POLL */

                /*******************************************************************************/
#if RFAL_FEATURE_NFC_DEP
            case RFAL_NFC_INTERFACE_NFCDEP:
                switch(gNfcDev.activeDev->type) {
                case RFAL_NFC_LISTEN_TYPE_AP2P:
                    rfalNfcDepRLS(); /* Send a Release to device */
                    break;
                default:
                    rfalNfcDepDSL(); /* Send a Deselect to device */
                    break;
                }
                break;
#endif /* RFAL_FEATURE_NFC_DEP */

            default:
                return ERR_REQUEST;
            }
#endif /* RFAL_NFC_SKIP_DEACT */
        }
    }

#if RFAL_FEATURE_WAKEUP_MODE
    rfalWakeUpModeStop();
#endif /* RFAL_FEATURE_WAKEUP_MODE */

#if RFAL_FEATURE_LISTEN_MODE
    rfalListenStop();
#else
    rfalFieldOff();
#endif

    gNfcDev.activeDev = NULL;
    return ERR_NONE;
}