/************************************************************************************************** * @fn MFRC522_Anticoll * @brief RC522和ISO14443卡通讯 * @param CardData -> 卡号数据 * @return ReqStatus -> 寻卡结果 ************************************************************************************************** */ uint8_t MFRC522_Anticoll(uint8_t *CardData) { uint8_t i; uint8_t AntiStatus = MFRC522_ERR; uint32_t AntiBits; //接收到的数据有效位数 uint8_t CardDataCheck = 0; MFRC522_ClearBitMask(Status2Reg,0x08); //关闭内部温度传感器 MFRC522_Write(BitFramingReg,0x00); //BIT2-BIT0=TxLastBists(000) 定义发送的最后一个字节的位数,000表示最后一个字节的所有位都应发送 MFRC522_ClearBitMask(CollReg,0x80); //BIT7=ValuesAfterColl(1) CardData[0] = PICC_ANTICOLL; CardData[1] = 0x20; AntiStatus = MFRC522_ToCard(PCD_TRANSCEIVE,CardData,2,CardData,&AntiBits); if(AntiStatus == MFRC522_OK) { /*校验卡号*/ for(i=0; i<4; i++) { CardDataCheck ^= CardData[i]; //1.datasheet/RFID/MifareCard/1.M1简单介绍,4byte卡号 1byte校验字 } if(CardDataCheck != CardData[i]) { AntiStatus = MFRC522_ERR; } } MFRC522_SetBitMask(CollReg,0x80); //BIT7=ValuesAfterColl(1) return AntiStatus; }
/************************************************************************************************** * @fn MFRC522_SelectTag * @brief 选卡,读取卡存储器容量 * @param CardData -> 卡号数据 * @return Size -> 卡号容量 ************************************************************************************************** */ uint8_t MFRC522_SelectTag(uint8_t *CardData) { uint8_t Buff[9]; uint8_t i; uint32_t Bits; uint8_t Size; uint8_t Status = MFRC522_ERR; MFRC522_ClearBitMask(Status2Reg,0x08); //BIT3=MFCrypto1On(1) Buff[0] = PICC_SElECTTAG; Buff[1] = 0x70; //? for(i=0; i<5; i++) { Buff[i+2] = CardData[i]; } MFRC522_CrcCheck(Buff,7,&Buff[7]); //buff[7] buff[8]表明CRC校验的低八位和高八位 Status = MFRC522_ToCard(PCD_TRANSCEIVE, Buff, 9, Buff, &Bits); if((Status == MFRC522_OK) && (Bits == 0x18)) //0x18 = 24 24/8 =3Byte { Size = Buff[0]; } else { Size = 0; } return Size; }
/************************************************************************************************** * @fn MFRC522_CrcCheck * @brief 用MF522计算CRC校验 * @param CrcData -> 要校验CRC的数据 CrcLen -> 数据长度 CheckData -> CRC校验结果 * @return Size -> 卡号容量 ************************************************************************************************** */ void MFRC522_CrcCheck(uint8_t *CrcData, uint8_t CrcLen, uint8_t *CheckData) { uint8_t i; uint8_t CrcIrq; MFRC522_ClearBitMask(DivIrqReg,0x04); //BIT2=CRCIrq(0) MFRC522_SetBitMask(FIFOLevelReg,0x80); //BIT7=FlushBuffer(1), FIFO初始化 /*1.向FIFO中写入数据*/ for(i=0; i<CrcLen; i++) { MFRC522_Write(FIFODataReg,CrcData[i]); } MFRC522_Write(CommandReg,PCD_CALCCRC); //激活CRC协处理器或执行自测试 /*2.等待CRC校验完成*/ i = 0xFF; do { CrcIrq = MFRC522_Read(DivIrqReg); //BIT2=CRCIrq,CRC协处理器在处理完FIFO缓冲区的所有数据后置位CRCIRq标志 i--; } while((i!=0)&&!(CrcIrq & 0x04)); //1)i=0超时跳出 2)处理完FIFO缓冲区的所有数据跳出 /*3.读取CRC校验结果*/ CheckData[0] = MFRC522_Read(CRCResultRegL); CheckData[1] = MFRC522_Read(CRCResultRegM); }
void MFRC522_CalculateCRC(uint8_t * pIndata, uint8_t len, uint8_t * pOutData) { uint8_t i, n; MFRC522_ClearBitMask(MFRC522_REG_DIV_IRQ, 0x04); // CRCIrq = 0 MFRC522_SetBitMask(MFRC522_REG_FIFO_LEVEL, 0x80); // Clear the FIFO pointer // Write_MFRC522(CommandReg, PCD_IDLE); // Writing data to the FIFO for (i = 0; i < len; i++) MFRC522_WriteRegister(MFRC522_REG_FIFO_DATA, *(pIndata+i)); MFRC522_WriteRegister(MFRC522_REG_COMMAND, PCD_CALCCRC); // Wait CRC calculation is complete i = 0xFF; do { n = MFRC522_ReadRegister(MFRC522_REG_DIV_IRQ); i--; } while ((i!=0) && !(n&0x04)); // CRCIrq = 1 // Read CRC calculation result pOutData[0] = MFRC522_ReadRegister(MFRC522_REG_CRC_RESULT_L); pOutData[1] = MFRC522_ReadRegister(MFRC522_REG_CRC_RESULT_M); }
uint8_t MFRC522_ToCard(uint8_t command, uint8_t * sendData, uint8_t sendLen, uint8_t * backData, uint16_t * backLen) { uint8_t status = MI_ERR; uint8_t irqEn = 0x00; uint8_t waitIRq = 0x00; uint8_t lastBits; uint8_t n; uint16_t i; switch (command) { case PCD_AUTHENT: { irqEn = 0x12; waitIRq = 0x10; break; } case PCD_TRANSCEIVE: { irqEn = 0x77; waitIRq = 0x30; break; } default: break; } MFRC522_WriteRegister(MFRC522_REG_COMM_IE_N, irqEn | 0x80); MFRC522_ClearBitMask(MFRC522_REG_COMM_IRQ, 0x80); MFRC522_SetBitMask(MFRC522_REG_FIFO_LEVEL, 0x80); MFRC522_WriteRegister(MFRC522_REG_COMMAND, PCD_IDLE); // Writing data to the FIFO for (i = 0; i < sendLen; i++) MFRC522_WriteRegister(MFRC522_REG_FIFO_DATA, sendData[i]); // Execute the command MFRC522_WriteRegister(MFRC522_REG_COMMAND, command); if (command == PCD_TRANSCEIVE) MFRC522_SetBitMask(MFRC522_REG_BIT_FRAMING, 0x80); // StartSend=1,transmission of data starts // Waiting to receive data to complete 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 = MFRC522_ReadRegister(MFRC522_REG_COMM_IRQ); i--; } while ((i!=0) && !(n&0x01) && !(n&waitIRq)); MFRC522_ClearBitMask(MFRC522_REG_BIT_FRAMING, 0x80); // StartSend=0 if (i != 0) { if (!(MFRC522_ReadRegister(MFRC522_REG_ERROR) & 0x1B)) { status = MI_OK; if (n & irqEn & 0x01) status = MI_NOTAGERR; if (command == PCD_TRANSCEIVE) { n = MFRC522_ReadRegister(MFRC522_REG_FIFO_LEVEL); lastBits = MFRC522_ReadRegister(MFRC522_REG_CONTROL) & 0x07; if (lastBits) *backLen = (n - 1) * 8 + lastBits; else *backLen = n * 8; if (n == 0) n = 1; if (n > MFRC522_MAX_LEN) n = MFRC522_MAX_LEN; for (i = 0; i < n; i++) backData[i] = MFRC522_ReadRegister(MFRC522_REG_FIFO_DATA); // Reading the received data in FIFO } } else status = MI_ERR; } return status; }
void MFRC522_AntennaOff(void) { MFRC522_ClearBitMask(MFRC522_REG_TX_CONTROL, 0x03); }
/************************************************************************************************** * @fn MFRC522_AntennaOff * @brief 关闭天线 * @param n * @return 无 ************************************************************************************************** */ void MFRC522_AntennaOff(void) { MFRC522_ClearBitMask(TxControlReg, 0x03); //TX2 TX1清0,,关闭了天线 }
/************************************************************************************************** * @fn MFRC522_ToCard * @brief RC522和ISO14443卡通讯 * @param Command -> MF522命令字 SendData -> 过RC522发送到卡片的数据, SendLen -> 发送的数据长度 ReceiveData -> 接收到的卡片返回数据 ReveiveLen -> 返回数据的位长度 * @return ReqStatus -> 寻卡结果 ************************************************************************************************** */ uint8_t MFRC522_ToCard(uint8_t Command, uint8_t *SendData, uint8_t SendLen, uint8_t *ReceiveData, uint32_t *ReveiveBits) { uint8_t Status = MFRC522_ERR; uint8_t IrqEn = 0x00; uint8_t WaitIrq = 0x00; uint32_t i; uint8_t IRqStatus; uint8_t FIFOLevel = 0x00; //FIFOLevelReg BIT6-BIT0 FIFO缓冲区中保存的字节数,BIT7被读时返回为0无须担心 uint8_t RxLastBits = 0x00; //ControlReg BIT2-BIT0 显示最后接收到的字节的有效位数目,如果该位为0,整个字节有效 switch(Command) { case PCD_AUTHENT: IrqEn = 0x12; //认证卡密 WaitIrq = 0x10; break; case PCD_TRANSCEIVE: IrqEn = 0x77; //发送FIFO中数据 WaitIrq = 0x30; break; default: break; } MFRC522_Write(CommIEnReg, IrqEn|0x80); //允许中断请求 MFRC522_ClearBitMask(CommIrqReg, 0x80); //清除所有中断请求位 MFRC522_SetBitMask(FIFOLevelReg, 0x80); //BIT7=FlushBuffer(1), FIFO初始化 MFRC522_Write(CommandReg, PCD_IDLE); //无动作,取消当前动作的执行 /*1.向FIFO中写入数据*/ for(i=0; i<SendLen; i++) { MFRC522_Write(FIFODataReg,SendData[i]); } /*2.执行发送命令,将FIFO缓冲区的数据发送到天线,发送完成后自动激活接收器*/ MFRC522_Write(CommandReg,Command); if((Command == PCD_TRANSCEIVE) ||(Command == PCD_AUTHENT)) { MFRC522_SetBitMask(BitFramingReg,0x80); //BIT7=StartSend(1):启动数据发送 } /*3.等待数据接收完成*/ i = 2000; //i根据时钟频率调整,操作M1卡最大等待时间15ms?注意上面MFRC522_Reset函数中定时器的设置时间是15ms do { IRqStatus = MFRC522_Read(CommIrqReg); i--; } while((i!=0)&& !(IRqStatus&0x01) && !(IRqStatus&WaitIrq)); //1)i=0超时跳出 2)定时器(15ms)减到0时跳出 3)命令终止或者接收完成跳出 MFRC522_ClearBitMask(BitFramingReg,0x80); //停止数据发送 /*4.检测寻卡状态*/ if(i != 0) { /*4.1.寻卡未发生错误*/ if(!(MFRC522_Read(ErrorReg) & 0x1B)) //未发生以下错误:BufferOvfl Collerr CRCErr ProtecolErr { Status = MFRC522_OK; //这里可以设一个断点查看,表明未发生错误 if(IRqStatus & IrqEn & 0x01) //定时器递减到零,寻卡超时 { Status = MFRC522_TIMEOUT; } /*4.1.1 接收到的数据处理*/ if(Command == PCD_TRANSCEIVE) { FIFOLevel = MFRC522_Read(FIFOLevelReg); //接收到的字节数 RxLastBits = MFRC522_Read(ControlReg) & 0x07; //最后一个字节的有效数 if(RxLastBits) //如果不是0,最后一个字节并不是整个字节有效 { *ReveiveBits = (FIFOLevel-1)*8 + RxLastBits; } else //如果是0,整个字节有效 { *ReveiveBits = FIFOLevel * 8; } if(FIFOLevel == 0) { FIFOLevel = 1; } if(FIFOLevel > FIFOLEVEL_MAX) { FIFOLevel = FIFOLEVEL_MAX; } /*4.1.2 读取接收到的数据*/ for(i=0; i<FIFOLevel; i++) { ReceiveData[i] = MFRC522_Read(FIFODataReg); //读取FIFO缓冲区的数据 } } } /*4.2.寻卡发生错误,错误类型未知*/ else { Status = MFRC522_ERR; } } /*5.清除*/ MFRC522_SetBitMask(ControlReg,0x80); //停止定时器 MFRC522_Write(CommandReg,PCD_IDLE); //无动作,取消当前动作的执行 return Status; }