Programmation lecteur RC522

Bonjour,

je suis étudiant ingénieur en systèmes embarqués et mon projet consiste en la réalisation d'un lecteur de badge RFID. J'ai acheté un lecteur RC522 que j'ai connecté à mon arduino ( en attendant de recevoir la véritable carte de projet MBED) via le port SPI. J'ai trouvé le code sur internet que j'ai modifié un peu par moi même et tout fonctionne parfaitement ! Le lecteur reconnait le badge et la carte Mifare et emet un bip de reconnaissance grâce à un buzzer.
Voila la datasheet du RC522: http://www.nxp.com/documents/data_sheet/MFRC522.pdf

Ainsi que le code:

Code:

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/*  * File Name : RFID.pde  * Creator : Dr.Leong (WWW.B2CQSHOP.COM)  * Create Date: 2011.09.19  * Modified by :  * Modify Date:  * Chinese comments translated using Google Translate by  * Description : Mifare1 -> find cards - > Anti-collision - > Select Card - > reader interface  */ // the sensor communicates using SPI, so include the library: #include <SPI.h> #include<Servo.h>   #define uchar unsigned char #define uint unsigned int   // Maximum length of the array #define MAX_LEN 16   ///////////////////////////////////////////////////////////////////// //set the pin ///////////////////////////////////////////////////////////////////// const int chipSelectPin = 10; const int NRSTPD = 5;   //MF522 command word #define PCD_IDLE 0x00 //NO action; cancel the current command #define PCD_AUTHENT 0x0E // authentication key #define PCD_RECEIVE 0x08 // receive data #define PCD_TRANSMIT 0x04 // Transmit Data #define PCD_TRANSCEIVE 0x0C // Send and receive data #define PCD_RESETPHASE 0x0F // Reset #define PCD_CALCCRC 0x03 // CRC calculation   //Mifare_One card command word #define PICC_REQIDL 0x26 // find the antenna area does not enter hibernation #define PICC_REQALL 0x52 // find all the cards antenna area #define PICC_ANTICOLL 0x93 // anti-collision #define PICC_SElECTTAG 0x93 // election card #define PICC_AUTHENT1A 0x60 // authentication key A #define PICC_AUTHENT1B 0x61 // authentication key B #define PICC_READ 0x30 // Read Block #define PICC_WRITE 0xA0 // write block #define PICC_DECREMENT 0xC0 // debit? #define PICC_INCREMENT 0xC1 // recharge? #define PICC_RESTORE 0xC2 // transfer block data to the buffer #define PICC_TRANSFER 0xB0 // save the data in the buffer #define PICC_HALT 0x50 // Sleep     //和MF522 communication error code is returned when #define MI_OK 0 #define MI_NOTAGERR 1 #define MI_ERR 2     //------------------MFRC522 register--------------- //Page 0:Command and Status #define Reserved00 0x00 #define CommandReg 0x01 #define CommIEnReg 0x02 #define DivlEnReg 0x03 #define CommIrqReg 0x04 #define DivIrqReg 0x05 #define ErrorReg 0x06 #define Status1Reg 0x07 #define Status2Reg 0x08 #define FIFODataReg 0x09 #define FIFOLevelReg 0x0A #define WaterLevelReg 0x0B #define ControlReg 0x0C #define BitFramingReg 0x0D #define CollReg 0x0E #define Reserved01 0x0F //Page 1:Command #define Reserved10 0x10 #define ModeReg 0x11 #define TxModeReg 0x12 #define RxModeReg 0x13 #define TxControlReg 0x14 #define TxAutoReg 0x15 #define TxSelReg 0x16 #define RxSelReg 0x17 #define RxThresholdReg 0x18 #define DemodReg 0x19 #define Reserved11 0x1A #define Reserved12 0x1B #define MifareReg 0x1C #define Reserved13 0x1D #define Reserved14 0x1E #define SerialSpeedReg 0x1F //Page 2:CFG #define Reserved20 0x20 #define CRCResultRegM 0x21 #define CRCResultRegL 0x22 #define Reserved21 0x23 #define ModWidthReg 0x24 #define Reserved22 0x25 #define RFCfgReg 0x26 #define GsNReg 0x27 #define CWGsPReg 0x28 #define ModGsPReg 0x29 #define TModeReg 0x2A #define TPrescalerReg 0x2B #define TReloadRegH 0x2C #define TReloadRegL 0x2D #define TCounterValueRegH 0x2E #define TCounterValueRegL 0x2F //Page 3:TestRegister #define Reserved30 0x30 #define TestSel1Reg 0x31 #define TestSel2Reg 0x32 #define TestPinEnReg 0x33 #define TestPinValueReg 0x34 #define TestBusReg 0x35 #define AutoTestReg 0x36 #define VersionReg 0x37 #define AnalogTestReg 0x38 #define TestDAC1Reg 0x39 #define TestDAC2Reg 0x3A #define TestADCReg 0x3B #define Reserved31 0x3C #define Reserved32 0x3D #define Reserved33 0x3E #define Reserved34 0x3F //----------------------------------------------- Servo myServo; //4 bytes card serial number , the first 5 bytes for the checksum byte uchar serNum[5];   uchar writeData[16]={0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 100}; // Initialize 100 dollars uchar moneyConsume = 18 ; // spending 18 yuan uchar moneyAdd = 10 ; // recharge 10 yuan // Sector A password , 16 sectors , each sector password 6Byte uchar sectorKeyA[16][16] = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, //{0x19, 0x84, 0x07, 0x15, 0x76, 0x14}, {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, }; uchar sectorNewKeyA[16][16] = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x84,0x07,0x15,0x76,0x14}, //you can set another ket , such as " 0x19, 0x84, 0x07, 0x15, 0x76, 0x14 " //{0x19, 0x84, 0x07, 0x15, 0x76, 0x14, 0xff,0x07,0x80,0x69, 0x19,0x84,0x07,0x15,0x76,0x14}, // but when loop, please set the sectorKeyA, the same key, so that RFID module can read the card {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x33,0x07,0x15,0x34,0x14}, };   void setup() { myServo.attach(9); Serial.begin(9600); // RFID reader SOUT pin connected to Serial RX pin at 2400bps Serial.println("Ready");   // start the SPI library: SPI.begin();   pinMode(chipSelectPin,OUTPUT); // Set digital pin 10 as OUTPUT to connect it to the RFID /ENABLE pin digitalWrite(chipSelectPin, LOW); // Activate the RFID reader pinMode(NRSTPD,OUTPUT); // Set digital pin 10 , Not Reset and Power-down digitalWrite(NRSTPD, HIGH);   MFRC522_Init(); }   void loop() { uchar i,tmp; uchar status; uchar str[MAX_LEN]; uchar RC_size; uchar blockAddr; // select the operating block addresses 0 to 63     // Find the card , back card type status = MFRC522_Request(PICC_REQIDL, str); // trouve la carte /*if (status == MI_OK)   * {   * Serial.println("Find out a card ");   * Serial.print(str[0],BIN);   * Serial.print(" , ");   * Serial.print(str[1],BIN);   * Serial.println(" ");   * }*/ status = MFRC522_Anticoll(str); // lit le numéro de série de la carte // Anti-collision, return card serial number 4 bytes memcpy(serNum, str, 5); // copie des 5 octets de str vers serNum if (status == MI_OK) {   /*Serial.println("The card's number is : ");   * Serial.print(serNum[0]); // ajouter, BIN pour avoir en binaire   * Serial.print(" , ");   * Serial.print(serNum[1]);   * Serial.print(" , ");   * Serial.print(serNum[2]);   * Serial.print(" , ");   * Serial.print(serNum[3]);   * Serial.print(" , ");   * Serial.print(serNum[4]);   * Serial.println(" ");*/ } if (serNum[0]==111 && serNum[1]==173 && serNum[2]==35 && serNum[3]==29 && serNum[4]==252 ) { Serial.println(" Bonjour Sebastien "); Serial.println(" Vous pouvez entrer "); tone (8, 400, 400); delay (500); myServo.write(180); delay (4000); myServo.write(0); } if (serNum[0]==132 && serNum[1]==210 && serNum[2]==114 && serNum[3]==26 && serNum[4]==62 ) { Serial.println(" Bonjour Monsieur !"); Serial.println(" Tu peux aussi entrer "); tone (8, 400, 400); delay (500); myServo.write(180); delay (4000); myServo.write(0);   } }           /*  * Function Name : Write_MFRC5200  * Description: MFRC522 of a register to write a byte of data  * Input Parameters : addr - register address ; val - the value to be written  * Return value: None  */   // page 11 -> MSB=BLPS // 1=read ; 0=write // LSB=0 void Write_MFRC522(uchar addr, uchar val) { digitalWrite(chipSelectPin, LOW); //actif   // Addresse au Format :0XXXXXX0 addr=addr<<1; // on souhaite un 0 en BLMS, on décale donc addr de 1 bit vers la gauche pour ne perdre aucune informations (p11) addr=addr&0x7E; //afin d'avoir BLPS=0 pour écrire SPI.transfer(addr); // ou sinon addr=(addr<<1)&0x7E SPI.transfer(val); // ecriture de la valeur digitalWrite(chipSelectPin, HIGH); //inactif }     /*  * Function Name : Read_MFRC522  * Description : From a certain MFRC522 read a byte of data register  * Input Parameters : addr - register address  * Return value : Returns a byte of data read from the  */ uchar Read_MFRC522(uchar addr) { uchar val;   digitalWrite(chipSelectPin, LOW); // actif   // Addresse au Format : 1XXXXXX0 afin de pouvoir lire addr=addr<<1; // on souhaite un 0 en BLMS, on décale donc addr de 1 bit vers la gauche pour ne perdre aucune informations (p11) addr=addr|0x80; //afin d'avoir BLPS=1 pour lire SPI.transfer(addr); // ou sinon SPI.transfer(((addr<<1)&0x7E) | 0x80); val =SPI.transfer(0x00); // envoit du BLPS p10   digitalWrite(chipSelectPin, HIGH); //inactif   return val; }   /*  * Function Name : SetBitMask  * Description: Set RC522 register bit  * Input parameters : reg - register address ; mask - set value  * Return value: None  */ void SetBitMask(uchar reg, uchar mask) // a voir { uchar tmp; tmp = Read_MFRC522(reg); Write_MFRC522(reg, tmp | mask); // set bit mask }     /*  * Function Name : ClearBitMask  * Description : clear RC522 register bit  * Input parameters : reg - register address ; mask - clear bit value  * Return value: None  */ void ClearBitMask(uchar reg, uchar mask) // a voir { uchar tmp; tmp = Read_MFRC522(reg); Write_MFRC522(reg, tmp & (~mask)); // clear bit mask }     /*  * Function Name : AntennaOn  * Description : Open antennas, each time you start or shut down the natural barrier between the transmitter should be at least 1ms interval  * Input: None  * Return value: None  */ void AntennaOn(void) { uchar temp;   temp = Read_MFRC522(TxControlReg); if (!(temp & 0x03)) { SetBitMask(TxControlReg, 0x03); } }     /*  * Function Name : AntennaOff  * Description : Close antennas, each time you start or shut down the natural barrier between the transmitter should be at least 1ms interval  * Input: None  * Return value: None  * /  */ void AntennaOff(void) { ClearBitMask(TxControlReg, 0x03); }     /*  * Function Name : ResetMFRC522  * Description : Reset RC522  * Input: None  * Return value: None  */ void MFRC522_Reset(void) { Write_MFRC522(CommandReg, PCD_RESETPHASE); //CommandReg 0x01 starts and stops command execution }     /*  * Function Name : InitMFRC522  * Description : Initialize RC522  * Input: None  * Return value: None  */ void MFRC522_Init(void) { digitalWrite(NRSTPD,HIGH);   MFRC522_Reset();   //Timer: TPrescaler*TreloadVal/6.78MHz = 24ms Write_MFRC522(TModeReg, 0x8D); //Tauto=1; f(Timer) = 6.78MHz/TPreScaler p53 Write_MFRC522(TPrescalerReg, 0x3E); //TModeReg[3..0] + TPrescalerReg Write_MFRC522(TReloadRegL, 30); Write_MFRC522(TReloadRegH, 0);   Write_MFRC522(TxAutoReg, 0x40); //100%ASK Write_MFRC522(ModeReg, 0x3D); //CRC初始值0x6363 ???   //ClearBitMask(Status2Reg, 0x08); //MFCrypto1On=0 //Write_MFRC522(RxSelReg, 0x86); //RxWait = RxSelReg[5..0] //Write_MFRC522(RFCfgReg, 0x7F); //RxGain = 48dB   AntennaOn(); //打开天线 }     /*  * Function Name : MFRC522_Request  * Description : Find cards , read the card type number  * Input parameters : reqMode - find cards way  * TagType - Return Card Type  * 0x4400 = Mifare_UltraLight  * 0x0400 = Mifare_One (S50)  * 0x0200 = Mifare_One (S70)  * 0x0800 = Mifare_Pro (X)  * 0x4403 = Mifare_DESFire  * Return value: the successful return MI_OK  */ uchar MFRC522_Request(uchar reqMode, uchar *TagType) // trouve la carte et identifie le numéro du type de carte { uchar status; uint backBits; // received data bits   Write_MFRC522(BitFramingReg, 0x07); //TxLastBists = BitFramingReg[2..0] ???   TagType[0] = reqMode; status = MFRC522_ToCard(PCD_TRANSCEIVE, TagType, 1, TagType, &backBits);   if ((status != MI_OK) || (backBits != 0x10)) { status = MI_ERR; }   return status; }     /*  * Function Name : MFRC522_ToCard  * Description : RC522 and ISO14443 card communication  * Input Parameters : command - MF522 command word,  * SendData - RC522 sent to the card via the data  * SendLen - length of data sent  * BackData - received the card returns data,  * BackLen - return data bit length  * Return value: the successful return MI_OK  */ uchar MFRC522_ToCard(uchar command, uchar *sendData, uchar sendLen, uchar *backData, uint *backLen) { uchar status = MI_ERR; uchar irqEn = 0x00; uchar waitIRq = 0x00; uchar lastBits; uchar n; uint i;   switch (command) { case PCD_AUTHENT: // certification cards close if command=PCD_AUTHENT 0x0E // authentication key { irqEn = 0x12; waitIRq = 0x10; break; } case PCD_TRANSCEIVE: // transmit FIFO data if command=PCD_TRANSCEIVE 0x0C // Send and receive data { irqEn = 0x77; waitIRq = 0x30; break; } default: break; }   Write_MFRC522(CommIEnReg, irqEn|0x80); // enable interrupt request ClearBitMask(CommIrqReg, 0x80); // clear all interrupt request bit SetBitMask(FIFOLevelReg, 0x80); // FlushBuffer = 1, FIFO initialization   Write_MFRC522(CommandReg, PCD_IDLE); // NO action; cancel the current command ? ? ?   // Write data to the FIFO for (i=0; i<sendLen; i++) { Write_MFRC522(FIFODataReg, sendData[i]); }   // Execute the command Write_MFRC522(CommandReg, command); if (command == PCD_TRANSCEIVE) { SetBitMask(BitFramingReg, 0x80); //StartSend=1,transmission of data starts }   // Wait for completion of receiving data i = 2000; // i according to the clock frequency adjustment , the operator M1 card maximum waiting time 25ms??? do { //CommIrqReg[7..0] //Set1 TxIRq RxIRq IdleIRq HiAlerIRq LoAlertIRq ErrIRq TimerIRq n = Read_MFRC522(CommIrqReg); i--; } while ((i!=0) && !(n&0x01) && !(n&waitIRq));   ClearBitMask(BitFramingReg, 0x80); //StartSend=0   if (i != 0) { if(!(Read_MFRC522(ErrorReg) & 0x1B)) //BufferOvfl Collerr CRCErr ProtecolErr { status = MI_OK; if (n & irqEn & 0x01) { status = MI_NOTAGERR; //?? }   if (command == PCD_TRANSCEIVE) { n = Read_MFRC522(FIFOLevelReg); lastBits = Read_MFRC522(ControlReg) & 0x07; if (lastBits) { *backLen = (n-1)*8 + lastBits; } else { *backLen = n*8; }   if (n == 0) { n = 1; } if (n > MAX_LEN) { n = MAX_LEN; }   // Read the received data in FIFO for (i=0; i<n; i++) { backData[i] = Read_MFRC522(FIFODataReg); } } } else { status = MI_ERR; }   }   //SetBitMask(ControlReg,0x80); //timer stops //Write_MFRC522(CommandReg, PCD_IDLE);   return status; }     /*  * Function Name : MFRC522_Anticoll  * Description : Anti- collision detection , reading selected card serial number card  * Input parameters : serNum - returns 4 bytes card serial number , the first 5 bytes for the checksum byte  * Return value: the successful return MI_OK  */ uchar MFRC522_Anticoll(uchar *serNum) { uchar status; uchar i; uchar serNumCheck=0; uint unLen;     //ClearBitMask(Status2Reg, 0x08); //TempSensclear //ClearBitMask(CollReg,0x80); //ValuesAfterColl Write_MFRC522(BitFramingReg, 0x00); //TxLastBists = BitFramingReg[2..0]   serNum[0] = PICC_ANTICOLL; serNum[1] = 0x20; status = MFRC522_ToCard(PCD_TRANSCEIVE, serNum, 2, serNum, &unLen);   if (status == MI_OK) { // Check Card Serial Number for (i=0; i<4; i++) { serNumCheck ^= serNum[i]; } if (serNumCheck != serNum[i]) { status = MI_ERR; } }   //SetBitMask(CollReg, 0x80); //ValuesAfterColl=1   return status; }     /*  * Function Name : CalulateCRC  * Description: CRC calculation with MF522  * Input parameters : pIndata - To read the CRC data , len - the data length , pOutData - CRC calculation results  * Return value: None  */ void CalulateCRC(uchar *pIndata, uchar len, uchar *pOutData) { uchar i, n;   ClearBitMask(DivIrqReg, 0x04); //CRCIrq = 0 SetBitMask(FIFOLevelReg, 0x80); //清FIFO指针 //Write_MFRC522(CommandReg, PCD_IDLE);   // Write data to the FIFO for (i=0; i<len; i++) { Write_MFRC522(FIFODataReg, *(pIndata+i)); } Write_MFRC522(CommandReg, PCD_CALCCRC);   // Read the CRC calculation result i = 0xFF; do { n = Read_MFRC522(DivIrqReg); i--; } while ((i!=0) && !(n&0x04)); //CRCIrq = 1   // Read the CRC calculation result pOutData[0] = Read_MFRC522(CRCResultRegL); pOutData[1] = Read_MFRC522(CRCResultRegM); }     /*  * Function Name : MFRC522_SelectTag  * Description: election card , read the card memory capacity  * Input parameters : serNum - Incoming card serial number  * Return value: the successful return of card capacity  */ uchar MFRC522_SelectTag(uchar *serNum) { uchar i; uchar status; uchar size; uint recvBits; uchar buffer[9];   //ClearBitMask(Status2Reg, 0x08); //MFCrypto1On=0   buffer[0] = PICC_SElECTTAG; buffer[1] = 0x70; for (i=0; i<5; i++) { buffer[i+2] = *(serNum+i); } CalulateCRC(buffer, 7, &buffer[7]); //?? status = MFRC522_ToCard(PCD_TRANSCEIVE, buffer, 9, buffer, &recvBits);   if ((status == MI_OK) && (recvBits == 0x18)) { size = buffer[0]; } else { size = 0; }   return size; }     /*  * Function Name : MFRC522_Auth  * Description : Verify card password  * Input parameters : authMode - Password Authentication Mode  * 0x60 = A key authentication  * 0x61 = B key authentication  * BlockAddr - block address  * Sectorkey - Sector password  * serNum - card serial number, 4-byte  * Return value: the successful return MI_OK  */ uchar MFRC522_Auth(uchar authMode, uchar BlockAddr, uchar *Sectorkey, uchar *serNum) { uchar status; uint recvBits; uchar i; uchar buff[12];   // Validate instruction block address + sector + password + card serial number buff[0] = authMode; buff[1] = BlockAddr; for (i=0; i<6; i++) { buff[i+2] = *(Sectorkey+i); } for (i=0; i<4; i++) { buff[i+8] = *(serNum+i); } status = MFRC522_ToCard(PCD_AUTHENT, buff, 12, buff, &recvBits);   if ((status != MI_OK) || (!(Read_MFRC522(Status2Reg) & 0x08))) { status = MI_ERR; }   return status; }     /*  * Function Name : MFRC522_Read  * Description : Read block data  * Input parameters : blockAddr - block address ; recvData - read block data  * Return value: the successful return MI_OK  */ uchar MFRC522_Read(uchar blockAddr, uchar *recvData) { uchar status; uint unLen;   recvData[0] = PICC_READ; recvData[1] = blockAddr; CalulateCRC(recvData,2, &recvData[2]); status = MFRC522_ToCard(PCD_TRANSCEIVE, recvData, 4, recvData, &unLen);   if ((status != MI_OK) || (unLen != 0x90)) { status = MI_ERR; }   return status; }     /*  * Function Name : MFRC522_Write  * Description : Write block data  * Input parameters : blockAddr - block address ; writeData - to 16-byte data block write  * Return value: the successful return MI_OK  */ uchar MFRC522_Write(uchar blockAddr, uchar *writeData) { uchar status; uint recvBits; uchar i; uchar buff[18];   buff[0] = PICC_WRITE; buff[1] = blockAddr; CalulateCRC(buff, 2, &buff[2]); status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 4, buff, &recvBits);   if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A)) { status = MI_ERR; }   if (status == MI_OK) { for (i=0; i<16; i++) //向FIFO写16Byte数据 { buff[i] = *(writeData+i); } CalulateCRC(buff, 16, &buff[16]); status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 18, buff, &recvBits);   if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A)) { status = MI_ERR; } }   return status; }     /*  * Function Name : MFRC522_Halt  * Description : Command card into hibernation  * Input: None  * Return value: None  */ void MFRC522_Halt(void) { uchar status; uint unLen; uchar buff[4];   buff[0] = PICC_HALT; buff[1] = 0; CalulateCRC(buff, 2, &buff[2]);   status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 4, buff,&unLen); }

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Cependant le code utilisé me parait relativement compliqué et j'ai beaucoup de mal à le comprendre d'ou l'objet de mon post. Après quelques bonnes heures passés dessus, j'ai compris l'intégralité de quelques fonctions notamment
" Write_MFRC522" et "Read_MFRC522" ainsi que certains bouts de code par ci par la.
J'ai pas mal étudié la datasheet du lecteur RC522 et par exemple, je ne comprend pas la fonction

"MFRC522_ToCard", je sais qu'elle identifie la norme ISO14443 et qu'elle l'applique sur le badge, enfin c'est ce que j'ai compris... Mais concrètement dans cette fonction qu'est ce qu'il se passe ?

En espérant avoir quelques réponses ou des éléments de réponses qui pourront me faire avancer, je vous remercie d'avance ;)

Code:

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/*  * Function Name : MFRC522_ToCard  * Description : RC522 and ISO14443 card communication  * Input Parameters : command - MF522 command word,  * SendData - RC522 sent to the card via the data  * SendLen - length of data sent  * BackData - received the card returns data,  * BackLen - return data bit length  * Return value: the successful return MI_OK  */ uchar MFRC522_ToCard(uchar command, uchar *sendData, uchar sendLen, uchar *backData, uint *backLen) { uchar status = MI_ERR; uchar irqEn = 0x00; uchar waitIRq = 0x00; uchar lastBits; uchar n; uint i;   switch (command) { case PCD_AUTHENT: // certification cards close if command=PCD_AUTHENT 0x0E // authentication key { irqEn = 0x12; waitIRq = 0x10; break; } case PCD_TRANSCEIVE: // transmit FIFO data if command=PCD_TRANSCEIVE 0x0C // Send and receive data { irqEn = 0x77; waitIRq = 0x30; break; } default: break; }   Write_MFRC522(CommIEnReg, irqEn|0x80); // enable interrupt request ClearBitMask(CommIrqReg, 0x80); // clear all interrupt request bit SetBitMask(FIFOLevelReg, 0x80); // FlushBuffer = 1, FIFO initialization   Write_MFRC522(CommandReg, PCD_IDLE); // NO action; cancel the current command ? ? ?   // Write data to the FIFO for (i=0; i<sendLen; i++) { Write_MFRC522(FIFODataReg, sendData[i]); }   // Execute the command Write_MFRC522(CommandReg, command); if (command == PCD_TRANSCEIVE) { SetBitMask(BitFramingReg, 0x80); //StartSend=1,transmission of data starts }   // Wait for completion of receiving data i = 2000; // i according to the clock frequency adjustment , the operator M1 card maximum waiting time 25ms??? do { //CommIrqReg[7..0] //Set1 TxIRq RxIRq IdleIRq HiAlerIRq LoAlertIRq ErrIRq TimerIRq n = Read_MFRC522(CommIrqReg); i--; } while ((i!=0) && !(n&0x01) && !(n&waitIRq));   ClearBitMask(BitFramingReg, 0x80); //StartSend=0   if (i != 0) { if(!(Read_MFRC522(ErrorReg) & 0x1B)) //BufferOvfl Collerr CRCErr ProtecolErr { status = MI_OK; if (n & irqEn & 0x01) { status = MI_NOTAGERR; //?? }   if (command == PCD_TRANSCEIVE) { n = Read_MFRC522(FIFOLevelReg); lastBits = Read_MFRC522(ControlReg) & 0x07; if (lastBits) { *backLen = (n-1)*8 + lastBits; } else { *backLen = n*8; }   if (n == 0) { n = 1; } if (n > MAX_LEN) { n = MAX_LEN; }   // Read the received data in FIFO for (i=0; i<n; i++) { backData[i] = Read_MFRC522(FIFODataReg); } } } else { status = MI_ERR; }   }   //SetBitMask(ControlReg,0x80); //timer stops //Write_MFRC522(CommandReg, PCD_IDLE);   return status; }

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Cette fonction ne me parait pas bien sorcière. Elle est très procédurière, comme souvent quand on utilise des modules physiques externes, mais il n'y a rien qui soit bien compliqué d'un point de vue code pur. Grosso modo :

• Tu as une commande, d'où le switch au début pour savoir quoi faire.
• Tu as des données à envoyer d'où une boucle (for) pour envoyer chacun des bytes.
• Tu as des données qui sont reçues en retour d'où une boucle (do / while) de lecture.
• La dernière partie est un peu plus compliqué à comprendre quand on ne connait pas le protocole utilisé. Il y a un test pour savoir s'il a eu une erreur ou pas. Il y a une nouvelle boucle pour le cas de TRANSCEIVE.

Pour comprendre les détails, il te faut lire la datasheet et comprendre la datasheet. C'est le fonctionnement de ton module qui est traduit ici.

merci Bktero ! C'est vrai que cette fonction est au final plus simple qu'elle en avait l'air...
Je ne m'étais pas assez attardé sur la datasheet :p
Merci ;)