/******************************************************************************
* \attention
*
* <h2><center>© COPYRIGHT 2020 STMicroelectronics</center></h2>
*
* Licensed under ST MYLIBERTY SOFTWARE LICENSE AGREEMENT (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* www.st.com/myliberty
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
* AND SPECIFICALLY DISCLAIMING THE IMPLIED WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/*
* PROJECT: ST25R391x firmware
* Revision:
* LANGUAGE: ISO C99
*/
/*! \file rfal_nfca.c
*
* \author Gustavo Patricio
*
* \brief Provides several NFC-A convenience methods and definitions
*
* It provides a Poller (ISO14443A PCD) interface and as well as
* some NFC-A Listener (ISO14443A PICC) helpers.
*
* The definitions and helpers methods provided by this module are only
* up to ISO14443-3 layer
*
*/
/*
******************************************************************************
* INCLUDES
******************************************************************************
*/
#include "rfal_nfca.h"
#include "utils.h"
/*
******************************************************************************
* ENABLE SWITCH
******************************************************************************
*/
#ifndef RFAL_FEATURE_NFCA
#define RFAL_FEATURE_NFCA false /* NFC-A module configuration missing. Disabled by default */
#endif
#if RFAL_FEATURE_NFCA
/*
******************************************************************************
* GLOBAL DEFINES
******************************************************************************
*/
#define RFAL_NFCA_SLP_FWT rfalConvMsTo1fc(1) /*!< Check 1ms for any modulation ISO14443-3 6.4.3 */
#define RFAL_NFCA_SLP_CMD 0x50U /*!< SLP cmd (byte1) Digital 1.1 6.9.1 & Table 20 */
#define RFAL_NFCA_SLP_BYTE2 0x00U /*!< SLP byte2 Digital 1.1 6.9.1 & Table 20 */
#define RFAL_NFCA_SLP_CMD_POS 0U /*!< SLP cmd position Digital 1.1 6.9.1 & Table 20 */
#define RFAL_NFCA_SLP_BYTE2_POS 1U /*!< SLP byte2 position Digital 1.1 6.9.1 & Table 20 */
#define RFAL_NFCA_SDD_CT 0x88U /*!< Cascade Tag value Digital 1.1 6.7.2 */
#define RFAL_NFCA_SDD_CT_LEN 1U /*!< Cascade Tag length */
#define RFAL_NFCA_SLP_REQ_LEN 2U /*!< SLP_REQ length */
#define RFAL_NFCA_SEL_CMD_LEN 1U /*!< SEL_CMD length */
#define RFAL_NFCA_SEL_PAR_LEN 1U /*!< SEL_PAR length */
#define RFAL_NFCA_SEL_SELPAR rfalNfcaSelPar(7U, 0U)/*!< SEL_PAR on Select is always with 4 data/nfcid */
#define RFAL_NFCA_BCC_LEN 1U /*!< BCC length */
#define RFAL_NFCA_SDD_REQ_LEN (RFAL_NFCA_SEL_CMD_LEN + RFAL_NFCA_SEL_PAR_LEN) /*!< SDD_REQ length */
#define RFAL_NFCA_SDD_RES_LEN (RFAL_NFCA_CASCADE_1_UID_LEN + RFAL_NFCA_BCC_LEN) /*!< SDD_RES length */
#define RFAL_NFCA_T_RETRANS 5U /*!< t RETRANSMISSION [3, 33]ms EMVCo 2.6 A.5 */
#define RFAL_NFCA_N_RETRANS 2U /*!< Number of retries EMVCo 2.6 9.6.1.3 */
/*! SDD_REQ (Select) Cascade Levels */
enum
{
RFAL_NFCA_SEL_CASCADE_L1 = 0, /*!< SDD_REQ Cascade Level 1 */
RFAL_NFCA_SEL_CASCADE_L2 = 1, /*!< SDD_REQ Cascade Level 2 */
RFAL_NFCA_SEL_CASCADE_L3 = 2 /*!< SDD_REQ Cascade Level 3 */
};
/*! SDD_REQ (Select) request Cascade Level command Digital 1.1 Table 15 */
enum
{
RFAL_NFCA_CMD_SEL_CL1 = 0x93, /*!< SDD_REQ command Cascade Level 1 */
RFAL_NFCA_CMD_SEL_CL2 = 0x95, /*!< SDD_REQ command Cascade Level 2 */
RFAL_NFCA_CMD_SEL_CL3 = 0x97, /*!< SDD_REQ command Cascade Level 3 */
};
/*
******************************************************************************
* GLOBAL MACROS
******************************************************************************
*/
#define rfalNfcaSelPar( nBy, nbi ) (uint8_t)((((nBy)<<4U) & 0xF0U) | ((nbi)&0x0FU) ) /*!< Calculates SEL_PAR with the bytes/bits to be sent */
#define rfalNfcaCLn2SELCMD( cl ) (uint8_t)((uint8_t)(RFAL_NFCA_CMD_SEL_CL1) + (2U*(cl))) /*!< Calculates SEL_CMD with the given cascade level */
#define rfalNfcaNfcidLen2CL( len ) ((len) / 5U) /*!< Calculates cascade level by the NFCID length */
#define rfalNfcaRunBlocking( e, fn ) do{ (e)=(fn); rfalWorker(); }while( (e) == ERR_BUSY ) /*!< Macro used for the blocking methods */
/*
******************************************************************************
* GLOBAL TYPES
******************************************************************************
*/
/*! Colission Resolution states */
typedef enum{
RFAL_NFCA_CR_IDLE, /*!< IDLE state */
RFAL_NFCA_CR_CL, /*!< New Cascading Level state */
RFAL_NFCA_CR_SDD, /*!< Perform anticollsion state */
RFAL_NFCA_CR_SEL, /*!< Perform CL Selection state */
RFAL_NFCA_CR_DONE /*!< Collision Resolution done state */
}colResState;
/*! Colission Resolution context */
typedef struct{
uint8_t devLimit; /*!< Device limit to be used */
rfalComplianceMode compMode; /*!< Compliancy mode to be used */
rfalNfcaListenDevice* nfcaDevList; /*!< Location of the device list */
uint8_t* devCnt; /*!< Location of the device counter */
bool collPending; /*!< Collision pending flag */
bool* collPend; /*!< Location of collision pending flag (Single CR) */
rfalNfcaSelReq selReq; /*!< SelReqused during anticollision (Single CR) */
rfalNfcaSelRes* selRes; /*!< Location to place of the SEL_RES(SAK) (Single CR) */
uint8_t* nfcId1; /*!< Location to place the NFCID1 (Single CR) */
uint8_t* nfcId1Len; /*!< Location to place the NFCID1 length (Single CR) */
uint8_t cascadeLv; /*!< Current Cascading Level (Single CR) */
colResState state; /*!< Single Collision Resolution state (Single CR) */
uint8_t bytesTxRx; /*!< TxRx bytes used during anticollision loop (Single CR) */
uint8_t bitsTxRx; /*!< TxRx bits used during anticollision loop (Single CR) */
uint16_t rxLen;
uint32_t tmrFDT; /*!< FDT timer used between SED_REQs (Single CR) */
uint8_t retries; /*!< Retries to be performed upon a timeout error (Single CR)*/
uint8_t backtrackCnt; /*!< Backtrack retries (Single CR) */
bool doBacktrack; /*!< Backtrack flag (Single CR) */
}colResParams;
/*! RFAL NFC-A instance */
typedef struct{
colResParams CR; /*!< Collision Resolution context */
} rfalNfca;
/*! SLP_REQ (HLTA) format Digital 1.1 6.9.1 & Table 20 */
typedef struct
{
uint8_t frame[RFAL_NFCA_SLP_REQ_LEN]; /*!< SLP: 0x50 0x00 */
} rfalNfcaSlpReq;
/*
******************************************************************************
* LOCAL VARIABLES
******************************************************************************
*/
static rfalNfca gNfca; /*!< RFAL NFC-A instance */
/*
******************************************************************************
* LOCAL FUNCTION PROTOTYPES
******************************************************************************
*/
static uint8_t rfalNfcaCalculateBcc( const uint8_t* buf, uint8_t bufLen );
static ReturnCode rfalNfcaPollerStartSingleCollisionResolution( uint8_t devLimit, bool *collPending, rfalNfcaSelRes *selRes, uint8_t *nfcId1, uint8_t *nfcId1Len );
static ReturnCode rfalNfcaPollerGetSingleCollisionResolutionStatus( void );
/*
******************************************************************************
* LOCAL FUNCTIONS
******************************************************************************
*/
static uint8_t rfalNfcaCalculateBcc( const uint8_t* buf, uint8_t bufLen )
{
uint8_t i;
uint8_t BCC;
BCC = 0;
/* BCC is XOR over first 4 bytes of the SDD_RES Digital 1.1 6.7.2 */
for(i = 0; i < bufLen; i++)
{
BCC ^= buf[i];
}
return BCC;
}
/*******************************************************************************/
static ReturnCode rfalNfcaPollerStartSingleCollisionResolution( uint8_t devLimit, bool *collPending, rfalNfcaSelRes *selRes, uint8_t *nfcId1, uint8_t *nfcId1Len )
{
/* Check parameters */
if( (collPending == NULL) || (selRes == NULL) || (nfcId1 == NULL) || (nfcId1Len == NULL) )
{
return ERR_PARAM;
}
/* Initialize output parameters */
*collPending = false; /* Activity 1.1 9.3.4.6 */
*nfcId1Len = 0;
ST_MEMSET( nfcId1, 0x00, RFAL_NFCA_CASCADE_3_UID_LEN );
/* Save parameters */
gNfca.CR.devLimit = devLimit;
gNfca.CR.collPend = collPending;
gNfca.CR.selRes = selRes;
gNfca.CR.nfcId1 = nfcId1;
gNfca.CR.nfcId1Len = nfcId1Len;
platformTimerDestroy( gNfca.CR.tmrFDT );
gNfca.CR.tmrFDT = 0U;
gNfca.CR.retries = RFAL_NFCA_N_RETRANS;
gNfca.CR.cascadeLv = (uint8_t)RFAL_NFCA_SEL_CASCADE_L1;
gNfca.CR.state = RFAL_NFCA_CR_CL;
gNfca.CR.doBacktrack = false;
gNfca.CR.backtrackCnt = 3U;
return ERR_NONE;
}
/*******************************************************************************/
static ReturnCode rfalNfcaPollerGetSingleCollisionResolutionStatus( void )
{
ReturnCode ret;
uint8_t collBit = 1U; /* standards mandate or recommend collision bit to be set to One. */
/* Check if FDT timer is still running */
if( !platformTimerIsExpired( gNfca.CR.tmrFDT ) && (gNfca.CR.tmrFDT != 0U) )
{
return ERR_BUSY;
}
/*******************************************************************************/
/* Go through all Cascade Levels Activity 1.1 9.3.4 */
if( gNfca.CR.cascadeLv > (uint8_t)RFAL_NFCA_SEL_CASCADE_L3 )
{
return ERR_INTERNAL;
}
switch( gNfca.CR.state )
{
/*******************************************************************************/
case RFAL_NFCA_CR_CL:
/* Initialize the SDD_REQ to send for the new cascade level */
ST_MEMSET( (uint8_t*)&gNfca.CR.selReq, 0x00, sizeof(rfalNfcaSelReq) );
gNfca.CR.bytesTxRx = RFAL_NFCA_SDD_REQ_LEN;
gNfca.CR.bitsTxRx = 0U;
gNfca.CR.state = RFAL_NFCA_CR_SDD;
/* fall through */
/*******************************************************************************/
case RFAL_NFCA_CR_SDD: /* PRQA S 2003 # MISRA 16.3 - Intentional fall through */
/* Calculate SEL_CMD and SEL_PAR with the bytes/bits to be sent */
gNfca.CR.selReq.selCmd = rfalNfcaCLn2SELCMD( gNfca.CR.cascadeLv );
gNfca.CR.selReq.selPar = rfalNfcaSelPar(gNfca.CR.bytesTxRx, gNfca.CR.bitsTxRx);
/* Send SDD_REQ (Anticollision frame) */
ret = rfalISO14443ATransceiveAnticollisionFrame( (uint8_t*)&gNfca.CR.selReq, &gNfca.CR.bytesTxRx, &gNfca.CR.bitsTxRx, &gNfca.CR.rxLen, RFAL_NFCA_FDTMIN );
/* Retry upon timeout EMVCo 2.6 9.6.1.3 */
if( (ret == ERR_TIMEOUT) && (gNfca.CR.devLimit==0U) && (gNfca.CR.retries != 0U) )
{
gNfca.CR.retries--;
platformTimerDestroy( gNfca.CR.tmrFDT );
gNfca.CR.tmrFDT = platformTimerCreate( RFAL_NFCA_T_RETRANS );
break;
}
/* Covert rxLen into bytes */
gNfca.CR.rxLen = rfalConvBitsToBytes( gNfca.CR.rxLen );
if( (ret == ERR_TIMEOUT) && (gNfca.CR.backtrackCnt != 0U) && (!gNfca.CR.doBacktrack)
&& !((RFAL_NFCA_SDD_REQ_LEN == gNfca.CR.bytesTxRx) && (0U == gNfca.CR.bitsTxRx)) )
{
/* In multiple card scenarios it may always happen that some
* collisions of a weaker tag go unnoticed. If then a later
* collision is recognized and the strong tag has a 0 at the
* collision position then no tag will respond. Catch this
* corner case and then try with the bit being sent as zero. */
rfalNfcaSensRes sensRes;
ret = ERR_RF_COLLISION;
rfalNfcaPollerCheckPresence( RFAL_14443A_SHORTFRAME_CMD_REQA, &sensRes );
/* Algorithm below does a post-increment, decrement to go back to current position */
if (0U == gNfca.CR.bitsTxRx)
{
gNfca.CR.bitsTxRx = 7;
gNfca.CR.bytesTxRx--;
}
else
{
gNfca.CR.bitsTxRx--;
}
collBit = (uint8_t)( ((uint8_t*)&gNfca.CR.selReq)[gNfca.CR.bytesTxRx] & (1U << gNfca.CR.bitsTxRx) );
collBit = (uint8_t)((0U==collBit)?1U:0U); // invert the collision bit
gNfca.CR.doBacktrack = true;
gNfca.CR.backtrackCnt--;
}
else
{
gNfca.CR.doBacktrack = false;
}
if( ret == ERR_RF_COLLISION )
{
/* Check received length */
if( (gNfca.CR.bytesTxRx + ((gNfca.CR.bitsTxRx != 0U) ? 1U : 0U)) > (RFAL_NFCA_SDD_RES_LEN + RFAL_NFCA_SDD_REQ_LEN) )
{
return ERR_PROTO;
}
if( ((gNfca.CR.bytesTxRx + ((gNfca.CR.bitsTxRx != 0U) ? 1U : 0U)) > (RFAL_NFCA_CASCADE_1_UID_LEN + RFAL_NFCA_SDD_REQ_LEN)) && (gNfca.CR.backtrackCnt != 0U) )
{ /* Collision in BCC: Anticollide only UID part */
gNfca.CR.backtrackCnt--;
gNfca.CR.bytesTxRx = RFAL_NFCA_CASCADE_1_UID_LEN + RFAL_NFCA_SDD_REQ_LEN - 1U;
gNfca.CR.bitsTxRx = 7;
collBit = (uint8_t)( ((uint8_t*)&gNfca.CR.selReq)[gNfca.CR.bytesTxRx] & (1U << gNfca.CR.bitsTxRx) ); /* Not a real collision, extract the actual bit for the subsequent code */
}
if( (gNfca.CR.devLimit == 0U) && !(*gNfca.CR.collPend) )
{
/* Activity 1.0 & 1.1 9.3.4.12: If CON_DEVICES_LIMIT has a value of 0, then
* NFC Forum Device is configured to perform collision detection only */
*gNfca.CR.collPend = true;
return ERR_IGNORE;
}
*gNfca.CR.collPend = true;
/* Set and select the collision bit, with the number of bytes/bits successfully TxRx */
if (collBit != 0U)
{
((uint8_t*)&gNfca.CR.selReq)[gNfca.CR.bytesTxRx] = (uint8_t)(((uint8_t*)&gNfca.CR.selReq)[gNfca.CR.bytesTxRx] | (1U << gNfca.CR.bitsTxRx)); /* MISRA 10.3 */
}
else
{
((uint8_t*)&gNfca.CR.selReq)[gNfca.CR.bytesTxRx] = (uint8_t)(((uint8_t*)&gNfca.CR.selReq)[gNfca.CR.bytesTxRx] & ~(1U << gNfca.CR.bitsTxRx)); /* MISRA 10.3 */
}
gNfca.CR.bitsTxRx++;
/* Check if number of bits form a byte */
if( gNfca.CR.bitsTxRx == RFAL_BITS_IN_BYTE )
{
gNfca.CR.bitsTxRx = 0;
gNfca.CR.bytesTxRx++;
}
break;
}
/*******************************************************************************/
/* Check if Collision loop has failed */
if( ret != ERR_NONE )
{
return ret;
}
/* If collisions are to be reported check whether the response is complete */
if( (gNfca.CR.devLimit == 0U) && (gNfca.CR.rxLen != sizeof(rfalNfcaSddRes)) )
{
return ERR_PROTO;
}
/* Check if the received BCC match */
if( gNfca.CR.selReq.bcc != rfalNfcaCalculateBcc( gNfca.CR.selReq.nfcid1, RFAL_NFCA_CASCADE_1_UID_LEN ) )
{
return ERR_PROTO;
}
/*******************************************************************************/
/* Anticollision OK, Select this Cascade Level */
gNfca.CR.selReq.selPar = RFAL_NFCA_SEL_SELPAR;
gNfca.CR.retries = RFAL_NFCA_N_RETRANS;
gNfca.CR.state = RFAL_NFCA_CR_SEL;
break;
/*******************************************************************************/
case RFAL_NFCA_CR_SEL:
/* Send SEL_REQ (Select command) - Retry upon timeout EMVCo 2.6 9.6.1.3 */
ret = rfalTransceiveBlockingTxRx( (uint8_t*)&gNfca.CR.selReq, sizeof(rfalNfcaSelReq), (uint8_t*)gNfca.CR.selRes, sizeof(rfalNfcaSelRes), &gNfca.CR.rxLen, RFAL_TXRX_FLAGS_DEFAULT, RFAL_NFCA_FDTMIN );
/* Retry upon timeout EMVCo 2.6 9.6.1.3 */
if( (ret == ERR_TIMEOUT) && (gNfca.CR.devLimit==0U) && (gNfca.CR.retries != 0U) )
{
gNfca.CR.retries--;
platformTimerDestroy( gNfca.CR.tmrFDT );
gNfca.CR.tmrFDT = platformTimerCreate( RFAL_NFCA_T_RETRANS );
break;
}
if( ret != ERR_NONE )
{
return ret;
}
/* Ensure proper response length */
if( gNfca.CR.rxLen != sizeof(rfalNfcaSelRes) )
{
return ERR_PROTO;
}
/*******************************************************************************/
/* Check cascade byte, if cascade tag then go next cascade level */
if( *gNfca.CR.selReq.nfcid1 == RFAL_NFCA_SDD_CT )
{
/* Cascade Tag present, store nfcid1 bytes (excluding cascade tag) and continue for next CL */
ST_MEMCPY( &gNfca.CR.nfcId1[*gNfca.CR.nfcId1Len], &((uint8_t*)&gNfca.CR.selReq.nfcid1)[RFAL_NFCA_SDD_CT_LEN], (RFAL_NFCA_CASCADE_1_UID_LEN - RFAL_NFCA_SDD_CT_LEN) );
*gNfca.CR.nfcId1Len += (RFAL_NFCA_CASCADE_1_UID_LEN - RFAL_NFCA_SDD_CT_LEN);
/* Go to next cascade level */
gNfca.CR.state = RFAL_NFCA_CR_CL;
gNfca.CR.cascadeLv++;
}
else
{
/* UID Selection complete, Stop Cascade Level loop */
ST_MEMCPY( &gNfca.CR.nfcId1[*gNfca.CR.nfcId1Len], (uint8_t*)&gNfca.CR.selReq.nfcid1, RFAL_NFCA_CASCADE_1_UID_LEN );
*gNfca.CR.nfcId1Len += RFAL_NFCA_CASCADE_1_UID_LEN;
gNfca.CR.state = RFAL_NFCA_CR_DONE;
break; /* Only flag operation complete on the next execution */
}
break;
/*******************************************************************************/
case RFAL_NFCA_CR_DONE:
return ERR_NONE;
/*******************************************************************************/
default:
return ERR_WRONG_STATE;
}
return ERR_BUSY;
}
/*
******************************************************************************
* GLOBAL FUNCTIONS
******************************************************************************
*/
/*******************************************************************************/
ReturnCode rfalNfcaPollerInitialize( void )
{
ReturnCode ret;
EXIT_ON_ERR( ret, rfalSetMode( RFAL_MODE_POLL_NFCA, RFAL_BR_106, RFAL_BR_106 ) );
rfalSetErrorHandling( RFAL_ERRORHANDLING_NFC );
rfalSetGT( RFAL_GT_NFCA );
rfalSetFDTListen( RFAL_FDT_LISTEN_NFCA_POLLER );
rfalSetFDTPoll( RFAL_FDT_POLL_NFCA_POLLER );
return ERR_NONE;
}
/*******************************************************************************/
ReturnCode rfalNfcaPollerCheckPresence( rfal14443AShortFrameCmd cmd, rfalNfcaSensRes *sensRes )
{
ReturnCode ret;
uint16_t rcvLen;
/* Digital 1.1 6.10.1.3 For Commands ALL_REQ, SENS_REQ, SDD_REQ, and SEL_REQ, the NFC Forum Device *
* MUST treat receipt of a Listen Frame at a time after FDT(Listen, min) as a Timeour Error */
ret = rfalISO14443ATransceiveShortFrame( cmd, (uint8_t*)sensRes, (uint8_t)rfalConvBytesToBits(sizeof(rfalNfcaSensRes)), &rcvLen, RFAL_NFCA_FDTMIN );
if( (ret == ERR_RF_COLLISION) || (ret == ERR_CRC) || (ret == ERR_NOMEM) || (ret == ERR_FRAMING) || (ret == ERR_PAR) )
{
ret = ERR_NONE;
}
return ret;
}
/*******************************************************************************/
ReturnCode rfalNfcaPollerTechnologyDetection( rfalComplianceMode compMode, rfalNfcaSensRes *sensRes )
{
ReturnCode ret;
EXIT_ON_ERR( ret, rfalNfcaPollerCheckPresence( ((compMode == RFAL_COMPLIANCE_MODE_EMV) ? RFAL_14443A_SHORTFRAME_CMD_WUPA : RFAL_14443A_SHORTFRAME_CMD_REQA), sensRes ) );
/* Send SLP_REQ as Activity 1.1 9.2.3.6 and EMVCo 2.6 9.2.1.3 */
if( compMode != RFAL_COMPLIANCE_MODE_ISO)
{
rfalNfcaPollerSleep();
}
return ERR_NONE;
}
/*******************************************************************************/
ReturnCode rfalNfcaPollerSingleCollisionResolution( uint8_t devLimit, bool *collPending, rfalNfcaSelRes *selRes, uint8_t *nfcId1, uint8_t *nfcId1Len )
{
ReturnCode ret;
EXIT_ON_ERR( ret, rfalNfcaPollerStartSingleCollisionResolution( devLimit, collPending, selRes, nfcId1, nfcId1Len ) );
rfalNfcaRunBlocking( ret, rfalNfcaPollerGetSingleCollisionResolutionStatus() );
return ret;
}
/*******************************************************************************/
ReturnCode rfalNfcaPollerStartFullCollisionResolution( rfalComplianceMode compMode, uint8_t devLimit, rfalNfcaListenDevice *nfcaDevList, uint8_t *devCnt )
{
ReturnCode ret;
rfalNfcaSensRes sensRes;
uint16_t rcvLen;
if( (nfcaDevList == NULL) || (devCnt == NULL) )
{
return ERR_PARAM;
}
*devCnt = 0;
ret = ERR_NONE;
/*******************************************************************************/
/* Send ALL_REQ before Anticollision if a Sleep was sent before Activity 1.1 9.3.4.1 and EMVco 2.6 9.3.2.1 */
if( compMode != RFAL_COMPLIANCE_MODE_ISO )
{
ret = rfalISO14443ATransceiveShortFrame( RFAL_14443A_SHORTFRAME_CMD_WUPA, (uint8_t*)&nfcaDevList->sensRes, (uint8_t)rfalConvBytesToBits(sizeof(rfalNfcaSensRes)), &rcvLen, RFAL_NFCA_FDTMIN );
if(ret != ERR_NONE)
{
if( (compMode == RFAL_COMPLIANCE_MODE_EMV) || ((ret != ERR_RF_COLLISION) && (ret != ERR_CRC) && (ret != ERR_FRAMING) && (ret != ERR_PAR)) )
{
return ret;
}
}
/* Check proper SENS_RES/ATQA size */
if( (ret == ERR_NONE) && (rfalConvBytesToBits(sizeof(rfalNfcaSensRes)) != rcvLen) )
{
return ERR_PROTO;
}
}
/*******************************************************************************/
/* Store the SENS_RES from Technology Detection or from WUPA */
sensRes = nfcaDevList->sensRes;
if( devLimit > 0U ) /* MISRA 21.18 */
{
ST_MEMSET( nfcaDevList, 0x00, (sizeof(rfalNfcaListenDevice) * devLimit) );
}
/* Restore the prev SENS_RES, assuming that the SENS_RES received is from first device
* When only one device is detected it's not woken up then we'll have no SENS_RES (ATQA) */
nfcaDevList->sensRes = sensRes;
/* Save parameters */
gNfca.CR.devCnt = devCnt;
gNfca.CR.devLimit = devLimit;
gNfca.CR.nfcaDevList = nfcaDevList;
gNfca.CR.compMode = compMode;
#if RFAL_FEATURE_T1T
/*******************************************************************************/
/* Only check for T1T if previous SENS_RES was received without a transmission *
* error. When collisions occur bits in the SENS_RES may look like a T1T */
/* If T1T Anticollision is not supported Activity 1.1 9.3.4.3 */
if( rfalNfcaIsSensResT1T( &nfcaDevList->sensRes ) && (devLimit != 0U) && (ret == ERR_NONE) && (compMode != RFAL_COMPLIANCE_MODE_EMV) )
{
/* RID_REQ shall be performed Activity 1.1 9.3.4.24 */
rfalT1TPollerInitialize();
EXIT_ON_ERR( ret, rfalT1TPollerRid( &nfcaDevList->ridRes ) );
*devCnt = 1U;
nfcaDevList->isSleep = false;
nfcaDevList->type = RFAL_NFCA_T1T;
nfcaDevList->nfcId1Len = RFAL_NFCA_CASCADE_1_UID_LEN;
ST_MEMCPY( &nfcaDevList->nfcId1, &nfcaDevList->ridRes.uid, RFAL_NFCA_CASCADE_1_UID_LEN );
return ERR_NONE;
}
#endif /* RFAL_FEATURE_T1T */
return rfalNfcaPollerStartSingleCollisionResolution( devLimit, &gNfca.CR.collPending, &nfcaDevList->selRes, (uint8_t*)&nfcaDevList->nfcId1, &nfcaDevList->nfcId1Len );
}
/*******************************************************************************/
ReturnCode rfalNfcaPollerGetFullCollisionResolutionStatus( void )
{
ReturnCode ret;
uint8_t newDevType;
if( (gNfca.CR.nfcaDevList == NULL) || (gNfca.CR.devCnt == NULL) )
{
return ERR_WRONG_STATE;
}
/*******************************************************************************/
/* Check whether a T1T has already been detected */
if( rfalNfcaIsSensResT1T( &gNfca.CR.nfcaDevList->sensRes ) && (gNfca.CR.nfcaDevList->type == RFAL_NFCA_T1T) )
{
/* T1T doesn't support Anticollision */
return ERR_NONE;
}
/*******************************************************************************/
EXIT_ON_ERR( ret, rfalNfcaPollerGetSingleCollisionResolutionStatus() );
/* Assign Listen Device */
newDevType = ((uint8_t)gNfca.CR.nfcaDevList[*gNfca.CR.devCnt].selRes.sak) & RFAL_NFCA_SEL_RES_CONF_MASK; /* MISRA 10.8 */
/* PRQA S 4342 1 # MISRA 10.5 - Guaranteed that no invalid enum values are created: see guard_eq_RFAL_NFCA_T2T, .... */
gNfca.CR.nfcaDevList[*gNfca.CR.devCnt].type = (rfalNfcaListenDeviceType) newDevType;
gNfca.CR.nfcaDevList[*gNfca.CR.devCnt].isSleep = false;
(*gNfca.CR.devCnt)++;
/* If a collision was detected and device counter is lower than limit Activity 1.1 9.3.4.21 */
if( (*gNfca.CR.devCnt < gNfca.CR.devLimit) && (gNfca.CR.collPending) )
{
/* Put this device to Sleep Activity 1.1 9.3.4.22 */
rfalNfcaPollerSleep();
gNfca.CR.nfcaDevList[(*gNfca.CR.devCnt - 1U)].isSleep = true;
/* Send a new SENS_REQ to check for other cards Activity 1.1 9.3.4.23 */
ret = rfalNfcaPollerCheckPresence( RFAL_14443A_SHORTFRAME_CMD_REQA, &gNfca.CR.nfcaDevList[*gNfca.CR.devCnt].sensRes );
if( ret == ERR_TIMEOUT )
{
/* No more devices found, exit */
gNfca.CR.collPending = false;
}
else
{
/* Another device found, continue loop */
gNfca.CR.collPending = true;
}
}
else
{
/* Exit loop */
gNfca.CR.collPending = false;
}
/*******************************************************************************/
/* Check if collision resolution shall continue */
if( (*gNfca.CR.devCnt < gNfca.CR.devLimit) && (gNfca.CR.collPending) )
{
EXIT_ON_ERR( ret, rfalNfcaPollerStartSingleCollisionResolution( gNfca.CR.devLimit,
&gNfca.CR.collPending,
&gNfca.CR.nfcaDevList[*gNfca.CR.devCnt].selRes,
(uint8_t*)&gNfca.CR.nfcaDevList[*gNfca.CR.devCnt].nfcId1,
&gNfca.CR.nfcaDevList[*gNfca.CR.devCnt].nfcId1Len ) );
return ERR_BUSY;
}
return ERR_NONE;
}
/*******************************************************************************/
ReturnCode rfalNfcaPollerFullCollisionResolution( rfalComplianceMode compMode, uint8_t devLimit, rfalNfcaListenDevice *nfcaDevList, uint8_t *devCnt )
{
ReturnCode ret;
EXIT_ON_ERR( ret, rfalNfcaPollerStartFullCollisionResolution( compMode, devLimit, nfcaDevList, devCnt ) );
rfalNfcaRunBlocking( ret, rfalNfcaPollerGetFullCollisionResolutionStatus() );
return ret;
}
ReturnCode rfalNfcaPollerSleepFullCollisionResolution( uint8_t devLimit, rfalNfcaListenDevice *nfcaDevList, uint8_t *devCnt )
{
bool firstRound;
uint8_t tmpDevCnt;
ReturnCode ret;
if( (nfcaDevList == NULL) || (devCnt == NULL) )
{
return ERR_PARAM;
}
/* Only use ALL_REQ (WUPA) on the first round */
firstRound = true;
*devCnt = 0;
/* Perform collision resolution until no new device is found */
do
{
tmpDevCnt = 0;
ret = rfalNfcaPollerFullCollisionResolution( (firstRound ? RFAL_COMPLIANCE_MODE_NFC : RFAL_COMPLIANCE_MODE_ISO), (devLimit - *devCnt), &nfcaDevList[*devCnt], &tmpDevCnt );
if( (ret == ERR_NONE) && (tmpDevCnt > 0U) )
{
*devCnt += tmpDevCnt;
/* Check whether to seacrh for more devices */
if( *devCnt < devLimit )
{
/* Set last found device to sleep (all others are slept already) */
rfalNfcaPollerSleep();
nfcaDevList[((*devCnt)-1U)].isSleep = true;
/* Check if any other device is present */
ret = rfalNfcaPollerCheckPresence( RFAL_14443A_SHORTFRAME_CMD_REQA, &nfcaDevList[*devCnt].sensRes );
if( ret == ERR_NONE )
{
firstRound = false;
continue;
}
}
}
break;
}
while( true );
return ((*devCnt > 0U) ? ERR_NONE : ret);
}
/*******************************************************************************/
ReturnCode rfalNfcaPollerSelect( const uint8_t *nfcid1, uint8_t nfcidLen, rfalNfcaSelRes *selRes )
{
uint8_t i;
uint8_t cl;
uint8_t nfcidOffset;
uint16_t rxLen;
ReturnCode ret;
rfalNfcaSelReq selReq;
if( (nfcid1 == NULL) || (nfcidLen > RFAL_NFCA_CASCADE_3_UID_LEN) || (selRes == NULL) )
{
return ERR_PARAM;
}
/* Calculate Cascate Level */
cl = rfalNfcaNfcidLen2CL( nfcidLen );
nfcidOffset = 0;
/*******************************************************************************/
/* Go through all Cascade Levels Activity 1.1 9.4.4 */
for( i = RFAL_NFCA_SEL_CASCADE_L1; i <= cl; i++ )
{
/* Assign SEL_CMD according to the CLn and SEL_PAR*/
selReq.selCmd = rfalNfcaCLn2SELCMD(i);
selReq.selPar = RFAL_NFCA_SEL_SELPAR;
/* Compute NFCID/Data on the SEL_REQ command Digital 1.1 Table 18 */
if( cl != i )
{
*selReq.nfcid1 = RFAL_NFCA_SDD_CT;
ST_MEMCPY( &selReq.nfcid1[RFAL_NFCA_SDD_CT_LEN], &nfcid1[nfcidOffset], (RFAL_NFCA_CASCADE_1_UID_LEN - RFAL_NFCA_SDD_CT_LEN) );
nfcidOffset += (RFAL_NFCA_CASCADE_1_UID_LEN - RFAL_NFCA_SDD_CT_LEN);
}
else
{
ST_MEMCPY( selReq.nfcid1, &nfcid1[nfcidOffset], RFAL_NFCA_CASCADE_1_UID_LEN );
}
/* Calculate nfcid's BCC */
selReq.bcc = rfalNfcaCalculateBcc( (uint8_t*)&selReq.nfcid1, sizeof(selReq.nfcid1) );
/*******************************************************************************/
/* Send SEL_REQ */
EXIT_ON_ERR( ret, rfalTransceiveBlockingTxRx( (uint8_t*)&selReq, sizeof(rfalNfcaSelReq), (uint8_t*)selRes, sizeof(rfalNfcaSelRes), &rxLen, RFAL_TXRX_FLAGS_DEFAULT, RFAL_NFCA_FDTMIN ) );
/* Ensure proper response length */
if( rxLen != sizeof(rfalNfcaSelRes) )
{
return ERR_PROTO;
}
}
/* REMARK: Could check if NFCID1 is complete */
return ERR_NONE;
}
/*******************************************************************************/
ReturnCode rfalNfcaPollerSleep( void )
{
rfalNfcaSlpReq slpReq;
uint8_t rxBuf; /* dummy buffer, just to perform Rx */
slpReq.frame[RFAL_NFCA_SLP_CMD_POS] = RFAL_NFCA_SLP_CMD;
slpReq.frame[RFAL_NFCA_SLP_BYTE2_POS] = RFAL_NFCA_SLP_BYTE2;
rfalTransceiveBlockingTxRx( (uint8_t*)&slpReq, sizeof(rfalNfcaSlpReq), &rxBuf, sizeof(rxBuf), NULL, RFAL_TXRX_FLAGS_DEFAULT, RFAL_NFCA_SLP_FWT );
/* ISO14443-3 6.4.3 HLTA - If PICC responds with any modulation during 1 ms this response shall be interpreted as not acknowledge
Digital 2.0 6.9.2.1 & EMVCo 3.0 5.6.2.1 - consider the HLTA command always acknowledged
No check to be compliant with NFC and EMVCo, and to improve interoprability (Kovio RFID Tag)
*/
return ERR_NONE;
}
/*******************************************************************************/
bool rfalNfcaListenerIsSleepReq( const uint8_t *buf, uint16_t bufLen )
{
/* Check if length and payload match */
if( (bufLen != sizeof(rfalNfcaSlpReq)) || (buf[RFAL_NFCA_SLP_CMD_POS] != RFAL_NFCA_SLP_CMD) || (buf[RFAL_NFCA_SLP_BYTE2_POS] != RFAL_NFCA_SLP_BYTE2) )
{
return false;
}
return true;
}
/* If the guards here don't compile then the code above cannot work anymore. */
extern uint8_t guard_eq_RFAL_NFCA_T2T[((RFAL_NFCA_SEL_RES_CONF_MASK&(uint8_t)RFAL_NFCA_T2T) == (uint8_t)RFAL_NFCA_T2T)?1:(-1)];
extern uint8_t guard_eq_RFAL_NFCA_T4T[((RFAL_NFCA_SEL_RES_CONF_MASK&(uint8_t)RFAL_NFCA_T4T) == (uint8_t)RFAL_NFCA_T4T)?1:(-1)];
extern uint8_t guard_eq_RFAL_NFCA_NFCDEP[((RFAL_NFCA_SEL_RES_CONF_MASK&(uint8_t)RFAL_NFCA_NFCDEP) == (uint8_t)RFAL_NFCA_NFCDEP)?1:(-1)];
extern uint8_t guard_eq_RFAL_NFCA_T4T_NFCDEP[((RFAL_NFCA_SEL_RES_CONF_MASK&(uint8_t)RFAL_NFCA_T4T_NFCDEP) == (uint8_t)RFAL_NFCA_T4T_NFCDEP)?1:(-1)];
#endif /* RFAL_FEATURE_NFCA */