Momentum-Apps/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
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  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  ******************************************************************************
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/*! \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 )
{
    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));
            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, RFAL_TXRX_FLAGS_DEFAULT, 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;
                
                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 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;
}