/****************************************************************************** * \attention * *

© COPYRIGHT 2020 STMicroelectronics

* * 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 */