/**************************************************************************/ /*! @file Adafruit_PN532.cpp @author Adafruit Industries @license BSD (see license.txt) SPI Driver for NXP's PN532 NFC/13.56MHz RFID Transceiver This is a library for the Adafruit PN532 NFC/RFID breakout boards This library works with the Adafruit NFC breakout ----> https://www.adafruit.com/products/364 Check out the links above for our tutorials and wiring diagrams These chips use SPI to communicate, 4 required to interface Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! @section HISTORY v1.2 - Added writeGPIO() - Added readGPIO() v1.1 - Changed readPassiveTargetID() to handle multiple UID sizes - Added the following helper functions for text display static void PrintHex(const byte * data, const uint32_t numBytes) static void PrintHexChar(const byte * pbtData, const uint32_t numBytes) - Added the following Mifare Classic functions: bool mifareclassic_IsFirstBlock (uint32_t uiBlock) bool mifareclassic_IsTrailerBlock (uint32_t uiBlock) uint8_t mifareclassic_AuthenticateBlock (uint8_t * uid, uint8_t uidLen, uint32_t blockNumber, uint8_t keyNumber, uint8_t * keyData) uint8_t mifareclassic_ReadDataBlock (uint8_t blockNumber, uint8_t * data) uint8_t mifareclassic_WriteDataBlock (uint8_t blockNumber, uint8_t * data) - Added the following Mifare Ultalight functions: uint8_t mifareultralight_ReadPage (uint8_t page, uint8_t * buffer) */ /**************************************************************************/ #if ARDUINO >= 100 #include "Arduino.h" #else #include "WProgram.h" #endif #include "Adafruit_PN532.h" byte pn532ack[] = {0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00}; byte pn532response_firmwarevers[] = {0x00, 0xFF, 0x06, 0xFA, 0xD5, 0x03}; // Uncomment these lines to enable debug output for PN532(SPI) and/or MIFARE related code // #define PN532DEBUG // #define MIFAREDEBUG #define PN532_PACKBUFFSIZ 64 byte pn532_packetbuffer[PN532_PACKBUFFSIZ]; /**************************************************************************/ /*! @brief Instantiates a new PN532 class @param clk SPI clock pin (SCK) @param miso SPI MISO pin @param mosi SPI MOSI pin @param ss SPI chip select pin (CS/SSEL) */ /**************************************************************************/ Adafruit_PN532::Adafruit_PN532(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t ss) { _clk = clk; _miso = miso; _mosi = mosi; _ss = ss; pinMode(_ss, OUTPUT); pinMode(_clk, OUTPUT); pinMode(_mosi, OUTPUT); pinMode(_miso, INPUT); } /**************************************************************************/ /*! @brief Setups the HW */ /**************************************************************************/ void Adafruit_PN532::begin() { digitalWrite(_ss, LOW); delay(1000); // not exactly sure why but we have to send a dummy command to get synced up pn532_packetbuffer[0] = PN532_COMMAND_GETFIRMWAREVERSION; sendCommandCheckAck(pn532_packetbuffer, 1); // ignore response! } /**************************************************************************/ /*! @brief Prints a hexadecimal value in plain characters @param data Pointer to the byte data @param numBytes Data length in bytes */ /**************************************************************************/ void Adafruit_PN532::PrintHex(const byte * data, const uint32_t numBytes) { uint32_t szPos; for (szPos=0; szPos < numBytes; szPos++) { Serial.print("0x"); // Append leading 0 for small values if (data[szPos] <= 0xF) Serial.print("0"); Serial.print(data[szPos], HEX); if ((numBytes > 1) && (szPos != numBytes - 1)) { Serial.print(" "); } } Serial.println(""); } /**************************************************************************/ /*! @brief Prints a hexadecimal value in plain characters, along with the char equivalents in the following format 00 00 00 00 00 00 ...... @param data Pointer to the byte data @param numBytes Data length in bytes */ /**************************************************************************/ void Adafruit_PN532::PrintHexChar(const byte * data, const uint32_t numBytes) { uint32_t szPos; for (szPos=0; szPos < numBytes; szPos++) { // Append leading 0 for small values if (data[szPos] <= 0xF) Serial.print("0"); Serial.print(data[szPos], HEX); if ((numBytes > 1) && (szPos != numBytes - 1)) { Serial.print(" "); } } Serial.print(" "); for (szPos=0; szPos < numBytes; szPos++) { if (data[szPos] <= 0x1F) Serial.print("."); else Serial.print(data[szPos]); } Serial.println(""); } /**************************************************************************/ /*! @brief Checks the firmware version of the PN5xx chip @returns The chip's firmware version and ID */ /**************************************************************************/ uint32_t Adafruit_PN532::getFirmwareVersion(void) { uint32_t response; pn532_packetbuffer[0] = PN532_COMMAND_GETFIRMWAREVERSION; if (! sendCommandCheckAck(pn532_packetbuffer, 1)) return 0; // read data packet readspidata(pn532_packetbuffer, 12); // check some basic stuff if (0 != strncmp((char *)pn532_packetbuffer, (char *)pn532response_firmwarevers, 6)) { return 0; } response = pn532_packetbuffer[6]; response <<= 8; response |= pn532_packetbuffer[7]; response <<= 8; response |= pn532_packetbuffer[8]; response <<= 8; response |= pn532_packetbuffer[9]; return response; } /**************************************************************************/ /*! @brief Sends a command and waits a specified period for the ACK @param cmd Pointer to the command buffer @param cmdlen The size of the command in bytes @param timeout timeout before giving up @returns 1 if everything is OK, 0 if timeout occured before an ACK was recieved */ /**************************************************************************/ // default timeout of one second boolean Adafruit_PN532::sendCommandCheckAck(uint8_t *cmd, uint8_t cmdlen, uint16_t timeout) { uint16_t timer = 0; // write the command spiwritecommand(cmd, cmdlen); // Wait for chip to say its ready! while (readspistatus() != PN532_SPI_READY) { if (timeout != 0) { timer+=10; if (timer > timeout) return false; } delay(10); } // read acknowledgement if (!spi_readack()) { return false; } timer = 0; // Wait for chip to say its ready! while (readspistatus() != PN532_SPI_READY) { if (timeout != 0) { timer+=10; if (timer > timeout) return false; } delay(10); } return true; // ack'd command } /**************************************************************************/ /*! Writes an 8-bit value that sets the state of the PN532's GPIO pins @warning This function is provided exclusively for board testing and is dangerous since it will throw an error if any pin other than the ones marked "Can be used as GPIO" are modified! All pins that can not be used as GPIO should ALWAYS be left high (value = 1) or the system will become unstable and a HW reset will be required to recover the PN532. pinState[0] = P30 Can be used as GPIO pinState[1] = P31 Can be used as GPIO pinState[2] = P32 *** RESERVED (Must be 1!) *** pinState[3] = P33 Can be used as GPIO pinState[4] = P34 *** RESERVED (Must be 1!) *** pinState[5] = P35 Can be used as GPIO @returns 1 if everything executed properly, 0 for an error */ /**************************************************************************/ boolean Adafruit_PN532::writeGPIO(uint8_t pinstate) { uint8_t errorbit; // Make sure pinstate does not try to toggle P32 or P34 pinstate |= (1 << PN532_GPIO_P32) | (1 << PN532_GPIO_P34); // Fill command buffer pn532_packetbuffer[0] = PN532_COMMAND_WRITEGPIO; pn532_packetbuffer[1] = PN532_GPIO_VALIDATIONBIT | pinstate; // P3 Pins pn532_packetbuffer[2] = 0x00; // P7 GPIO Pins (not used ... taken by SPI) #ifdef PN532DEBUG Serial.print("Writing P3 GPIO: "); Serial.println(pn532_packetbuffer[1], HEX); #endif // Send the WRITEGPIO command (0x0E) if (! sendCommandCheckAck(pn532_packetbuffer, 3)) return 0x0; // Read response packet (00 FF PLEN PLENCHECKSUM D5 CMD+1(0x0F) DATACHECKSUM 00) readspidata(pn532_packetbuffer, 8); #ifdef PN532DEBUG Serial.print("Received: "); PrintHex(pn532_packetbuffer, 8); Serial.println(""); #endif return (pn532_packetbuffer[5] == 0x0F); } /**************************************************************************/ /*! Reads the state of the PN532's GPIO pins @returns An 8-bit value containing the pin state where: pinState[0] = P30 pinState[1] = P31 pinState[2] = P32 pinState[3] = P33 pinState[4] = P34 pinState[5] = P35 */ /**************************************************************************/ uint8_t Adafruit_PN532::readGPIO(void) { pn532_packetbuffer[0] = PN532_COMMAND_READGPIO; // Send the READGPIO command (0x0C) if (! sendCommandCheckAck(pn532_packetbuffer, 1)) return 0x0; // Read response packet (00 FF PLEN PLENCHECKSUM D5 CMD+1(0x0D) P3 P7 IO1 DATACHECKSUM 00) readspidata(pn532_packetbuffer, 11); /* READGPIO response should be in the following format: byte Description ------------- ------------------------------------------ b0..5 Frame header and preamble b6 P3 GPIO Pins b7 P7 GPIO Pins (not used ... taken by SPI) b8 Interface Mode Pins (not used ... bus select pins) b9..10 checksum */ #ifdef PN532DEBUG Serial.print("Received: "); PrintHex(pn532_packetbuffer, 11); Serial.println(""); Serial.print("P3 GPIO: 0x"); Serial.println(pn532_packetbuffer[6], HEX); Serial.print("P7 GPIO: 0x"); Serial.println(pn532_packetbuffer[7], HEX); Serial.print("IO GPIO: 0x"); Serial.println(pn532_packetbuffer[8], HEX); // Note: You can use the IO GPIO value to detect the serial bus being used switch(pn532_packetbuffer[8]) { case 0x00: // Using UART Serial.println("Using UART (IO = 0x00)"); break; case 0x01: // Using I2C Serial.println("Using I2C (IO = 0x01)"); break; case 0x02: // Using SPI Serial.println("Using SPI (IO = 0x02)"); break; } #endif return pn532_packetbuffer[6]; } /**************************************************************************/ /*! @brief Configures the SAM (Secure Access Module) */ /**************************************************************************/ boolean Adafruit_PN532::SAMConfig(void) { pn532_packetbuffer[0] = PN532_COMMAND_SAMCONFIGURATION; pn532_packetbuffer[1] = 0x01; // normal mode; pn532_packetbuffer[2] = 0x14; // timeout 50ms * 20 = 1 second pn532_packetbuffer[3] = 0x01; // use IRQ pin! if (! sendCommandCheckAck(pn532_packetbuffer, 4)) return false; // read data packet readspidata(pn532_packetbuffer, 8); return (pn532_packetbuffer[5] == 0x15); } /***** ISO14443A Commands ******/ /**************************************************************************/ /*! Waits for an ISO14443A target to enter the field @param cardBaudRate Baud rate of the card @param uid Pointer to the array that will be populated with the card's UID (up to 7 bytes) @param uidLength Pointer to the variable that will hold the length of the card's UID. @returns 1 if everything executed properly, 0 for an error */ /**************************************************************************/ boolean Adafruit_PN532::readPassiveTargetID(uint8_t cardbaudrate, uint8_t * uid, uint8_t * uidLength) { pn532_packetbuffer[0] = PN532_COMMAND_INLISTPASSIVETARGET; pn532_packetbuffer[1] = 1; // max 1 cards at once (we can set this to 2 later) pn532_packetbuffer[2] = cardbaudrate; if (! sendCommandCheckAck(pn532_packetbuffer, 3)) return 0x0; // no cards read // read data packet readspidata(pn532_packetbuffer, 20); // check some basic stuff /* ISO14443A card response should be in the following format: byte Description ------------- ------------------------------------------ b0..6 Frame header and preamble b7 Tags Found b8 Tag Number (only one used in this example) b9..10 SENS_RES b11 SEL_RES b12 NFCID Length b13..NFCIDLen NFCID */ #ifdef MIFAREDEBUG Serial.print("Found "); Serial.print(pn532_packetbuffer[7], DEC); Serial.println(" tags"); #endif if (pn532_packetbuffer[7] != 1) return 0; uint16_t sens_res = pn532_packetbuffer[9]; sens_res <<= 8; sens_res |= pn532_packetbuffer[10]; #ifdef MIFAREDEBUG Serial.print("ATQA: 0x"); Serial.println(sens_res, HEX); Serial.print("SAK: 0x"); Serial.println(pn532_packetbuffer[11], HEX); #endif /* Card appears to be Mifare Classic */ *uidLength = pn532_packetbuffer[12]; #ifdef MIFAREDEBUG Serial.print("UID:"); #endif for (uint8_t i=0; i < pn532_packetbuffer[12]; i++) { uid[i] = pn532_packetbuffer[13+i]; #ifdef MIFAREDEBUG Serial.print(" 0x");Serial.print(uid[i], HEX); #endif } #ifdef MIFAREDEBUG Serial.println(); #endif return 1; } /***** Mifare Classic Functions ******/ /**************************************************************************/ /*! Indicates whether the specified block number is the first block in the sector (block 0 relative to the current sector) */ /**************************************************************************/ bool Adafruit_PN532::mifareclassic_IsFirstBlock (uint32_t uiBlock) { // Test if we are in the small or big sectors if (uiBlock < 128) return ((uiBlock) % 4 == 0); else return ((uiBlock) % 16 == 0); } /**************************************************************************/ /*! Indicates whether the specified block number is the sector trailer */ /**************************************************************************/ bool Adafruit_PN532::mifareclassic_IsTrailerBlock (uint32_t uiBlock) { // Test if we are in the small or big sectors if (uiBlock < 128) return ((uiBlock + 1) % 4 == 0); else return ((uiBlock + 1) % 16 == 0); } /**************************************************************************/ /*! Tries to authenticate a block of memory on a MIFARE card using the INDATAEXCHANGE command. See section 7.3.8 of the PN532 User Manual for more information on sending MIFARE and other commands. @param uid Pointer to a byte array containing the card UID @param uidLen The length (in bytes) of the card's UID (Should be 4 for MIFARE Classic) @param blockNumber The block number to authenticate. (0..63 for 1KB cards, and 0..255 for 4KB cards). @param keyNumber Which key type to use during authentication (0 = MIFARE_CMD_AUTH_A, 1 = MIFARE_CMD_AUTH_B) @param keyData Pointer to a byte array containing the 6 byte key value @returns 1 if everything executed properly, 0 for an error */ /**************************************************************************/ uint8_t Adafruit_PN532::mifareclassic_AuthenticateBlock (uint8_t * uid, uint8_t uidLen, uint32_t blockNumber, uint8_t keyNumber, uint8_t * keyData) { uint8_t len; uint8_t i; // Hang on to the key and uid data memcpy (_key, keyData, 6); memcpy (_uid, uid, uidLen); _uidLen = uidLen; #ifdef MIFAREDEBUG Serial.print("Trying to authenticate card "); Adafruit_PN532::PrintHex(_uid, _uidLen); Serial.print("Using authentication KEY ");Serial.print(keyNumber ? 'B' : 'A');Serial.print(": "); Adafruit_PN532::PrintHex(_key, 6); #endif // Prepare the authentication command // pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE; /* Data Exchange Header */ pn532_packetbuffer[1] = 1; /* Max card numbers */ pn532_packetbuffer[2] = (keyNumber) ? MIFARE_CMD_AUTH_A : MIFARE_CMD_AUTH_B; pn532_packetbuffer[3] = blockNumber; /* Block Number (1K = 0..63, 4K = 0..255 */ memcpy (pn532_packetbuffer+4, _key, 6); for (i = 0; i < _uidLen; i++) { pn532_packetbuffer[10+i] = _uid[i]; /* 4 byte card ID */ } if (! sendCommandCheckAck(pn532_packetbuffer, 10+_uidLen)) return 0; // Read the response packet readspidata(pn532_packetbuffer, 12); // ToDo: How to check if the response is valid and we are authenticated??? // #ifdef PN532DEBUG // Serial.println("Authentification failed%s"); // #endif // return 0; return 1; } /**************************************************************************/ /*! Tries to read an entire 16-byte data block at the specified block address. @param blockNumber The block number to authenticate. (0..63 for 1KB cards, and 0..255 for 4KB cards). @param data Pointer to the byte array that will hold the retrieved data (if any) @returns 1 if everything executed properly, 0 for an error */ /**************************************************************************/ uint8_t Adafruit_PN532::mifareclassic_ReadDataBlock (uint8_t blockNumber, uint8_t * data) { #ifdef MIFAREDEBUG Serial.print("Trying to read 16 bytes from block ");Serial.println(blockNumber); #endif /* Prepare the command */ pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE; pn532_packetbuffer[1] = 1; /* Card number */ pn532_packetbuffer[2] = MIFARE_CMD_READ; /* Mifare Read command = 0x30 */ pn532_packetbuffer[3] = blockNumber; /* Block Number (0..63 for 1K, 0..255 for 4K) */ /* Send the command */ if (! sendCommandCheckAck(pn532_packetbuffer, 4)) { #ifdef MIFAREDEBUG Serial.println("Failed to receive ACK for read command"); #endif return 0; } /* Read the response packet */ readspidata(pn532_packetbuffer, 26); /* If byte 8 isn't 0x00 we probably have an error */ if (pn532_packetbuffer[7] != 0x00) { //#ifdef MIFAREDEBUG Serial.println("Unexpected response"); Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 26); //#endif return 0; } /* Copy the 16 data bytes to the output buffer */ /* Block content starts at byte 9 of a valid response */ memcpy (data, pn532_packetbuffer+8, 16); /* Display data for debug if requested */ #ifdef MIFAREDEBUG Serial.print("Block "); Serial.println(blockNumber); Adafruit_PN532::PrintHexChar(data, 16); #endif return 1; } /**************************************************************************/ /*! Tries to write an entire 16-byte data block at the specified block address. @param blockNumber The block number to authenticate. (0..63 for 1KB cards, and 0..255 for 4KB cards). @param data The byte array that contains the data to write. @returns 1 if everything executed properly, 0 for an error */ /**************************************************************************/ uint8_t Adafruit_PN532::mifareclassic_WriteDataBlock (uint8_t blockNumber, uint8_t * data) { #ifdef MIFAREDEBUG Serial.print("Trying to write 16 bytes to block ");Serial.println(blockNumber); #endif /* Prepare the first command */ pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE; pn532_packetbuffer[1] = 1; /* Card number */ pn532_packetbuffer[2] = MIFARE_CMD_WRITE; /* Mifare Write command = 0xA0 */ pn532_packetbuffer[3] = blockNumber; /* Block Number (0..63 for 1K, 0..255 for 4K) */ memcpy (pn532_packetbuffer+4, data, 16); /* Data Payload */ /* Send the command */ if (! sendCommandCheckAck(pn532_packetbuffer, 20)) { #ifdef MIFAREDEBUG Serial.println("Failed to receive ACK for write command"); #endif return 0; } delay(10); /* Read the response packet */ readspidata(pn532_packetbuffer, 26); return 1; } /**************************************************************************/ /*! Formats a Mifare Classic card to store NDEF Records @returns 1 if everything executed properly, 0 for an error */ /**************************************************************************/ uint8_t Adafruit_PN532::mifareclassic_FormatNDEF (void) { uint8_t sectorbuffer1[16] = {0x14, 0x01, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1}; uint8_t sectorbuffer2[16] = {0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1, 0x03, 0xE1}; uint8_t sectorbuffer3[16] = {0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0x78, 0x77, 0x88, 0xC1, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; // Write block 1 and 2 to the card if (!(mifareclassic_WriteDataBlock (1, sectorbuffer1))) return 0; if (!(mifareclassic_WriteDataBlock (2, sectorbuffer2))) return 0; // Write key A and access rights card if (!(mifareclassic_WriteDataBlock (3, sectorbuffer3))) return 0; // Seems that everything was OK (?!) return 1; } /**************************************************************************/ /*! Writes an NDEF URI Record to the specified sector (1..15) Note that this function assumes that the Mifare Classic card is already formatted to work as an "NFC Forum Tag" and uses a MAD1 file system. You can use the NXP TagWriter app on Android to properly format cards for this. @param sectorNumber The sector that the URI record should be written to (can be 1..15 for a 1K card) @param uriIdentifier The uri identifier code (0 = none, 0x01 = "http://www.", etc.) @param url The uri text to write (max 38 characters). @returns 1 if everything executed properly, 0 for an error */ /**************************************************************************/ uint8_t Adafruit_PN532::mifareclassic_WriteNDEFURI (uint8_t sectorNumber, uint8_t uriIdentifier, const char * url) { // Figure out how long the string is uint8_t len = strlen(url); // Make sure we're within a 1K limit for the sector number if ((sectorNumber < 1) || (sectorNumber > 15)) return 0; // Make sure the URI payload is between 1 and 38 chars if ((len < 1) || (len > 38)) return 0; // Setup the sector buffer (w/pre-formatted TLV wrapper and NDEF message) uint8_t sectorbuffer1[16] = {0x00, 0x00, 0x03, len+5, 0xD1, 0x01, len+1, 0x55, uriIdentifier, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; uint8_t sectorbuffer2[16] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; uint8_t sectorbuffer3[16] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; uint8_t sectorbuffer4[16] = {0xD3, 0xF7, 0xD3, 0xF7, 0xD3, 0xF7, 0x7F, 0x07, 0x88, 0x40, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; if (len <= 6) { // Unlikely we'll get a url this short, but why not ... memcpy (sectorbuffer1+9, url, len); sectorbuffer1[len+9] = 0xFE; } else if (len == 7) { // 0xFE needs to be wrapped around to next block memcpy (sectorbuffer1+9, url, len); sectorbuffer2[0] = 0xFE; } else if ((len > 7) || (len <= 22)) { // Url fits in two blocks memcpy (sectorbuffer1+9, url, 7); memcpy (sectorbuffer2, url+7, len-7); sectorbuffer2[len-7] = 0xFE; } else if (len == 23) { // 0xFE needs to be wrapped around to final block memcpy (sectorbuffer1+9, url, 7); memcpy (sectorbuffer2, url+7, len-7); sectorbuffer3[0] = 0xFE; } else { // Url fits in three blocks memcpy (sectorbuffer1+9, url, 7); memcpy (sectorbuffer2, url+7, 16); memcpy (sectorbuffer3, url+23, len-24); sectorbuffer3[len-22] = 0xFE; } // Now write all three blocks back to the card if (!(mifareclassic_WriteDataBlock (sectorNumber*4, sectorbuffer1))) return 0; if (!(mifareclassic_WriteDataBlock ((sectorNumber*4)+1, sectorbuffer2))) return 0; if (!(mifareclassic_WriteDataBlock ((sectorNumber*4)+2, sectorbuffer3))) return 0; if (!(mifareclassic_WriteDataBlock ((sectorNumber*4)+3, sectorbuffer4))) return 0; // Seems that everything was OK (?!) return 1; } /***** Mifare Ultralight Functions ******/ /**************************************************************************/ /*! Tries to read an entire 4-byte page at the specified address. @param page The page number (0..63 in most cases) @param buffer Pointer to the byte array that will hold the retrieved data (if any) */ /**************************************************************************/ uint8_t Adafruit_PN532::mifareultralight_ReadPage (uint8_t page, uint8_t * buffer) { if (page >= 64) { #ifdef MIFAREDEBUG Serial.println("Page value out of range"); #endif return 0; } #ifdef MIFAREDEBUG Serial.print("Reading page ");Serial.println(page); #endif /* Prepare the command */ pn532_packetbuffer[0] = PN532_COMMAND_INDATAEXCHANGE; pn532_packetbuffer[1] = 1; /* Card number */ pn532_packetbuffer[2] = MIFARE_CMD_READ; /* Mifare Read command = 0x30 */ pn532_packetbuffer[3] = page; /* Page Number (0..63 in most cases) */ /* Send the command */ if (! sendCommandCheckAck(pn532_packetbuffer, 4)) { #ifdef MIFAREDEBUG Serial.println("Failed to receive ACK for write command"); #endif return 0; } /* Read the response packet */ readspidata(pn532_packetbuffer, 26); #ifdef MIFAREDEBUG Serial.println("Received: "); Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 26); #endif /* If byte 8 isn't 0x00 we probably have an error */ if (pn532_packetbuffer[7] == 0x00) { /* Copy the 4 data bytes to the output buffer */ /* Block content starts at byte 9 of a valid response */ /* Note that the command actually reads 16 byte or 4 */ /* pages at a time ... we simply discard the last 12 */ /* bytes */ memcpy (buffer, pn532_packetbuffer+8, 4); } else { #ifdef MIFAREDEBUG Serial.println("Unexpected response reading block: "); Adafruit_PN532::PrintHexChar(pn532_packetbuffer, 26); #endif return 0; } /* Display data for debug if requested */ #ifdef MIFAREDEBUG Serial.print("Page ");Serial.print(page);Serial.println(":"); Adafruit_PN532::PrintHexChar(buffer, 4); #endif // Return OK signal return 1; } /************** high level SPI */ /**************************************************************************/ /*! @brief Tries to read the SPI ACK signal */ /**************************************************************************/ boolean Adafruit_PN532::spi_readack() { uint8_t ackbuff[6]; readspidata(ackbuff, 6); return (0 == strncmp((char *)ackbuff, (char *)pn532ack, 6)); } /************** mid level SPI */ /**************************************************************************/ /*! @brief Reads the SPI status register (to know if the PN532 is ready) */ /**************************************************************************/ uint8_t Adafruit_PN532::readspistatus(void) { digitalWrite(_ss, LOW); delay(2); spiwrite(PN532_SPI_STATREAD); // read byte uint8_t x = spiread(); digitalWrite(_ss, HIGH); return x; } /**************************************************************************/ /*! @brief Reads n bytes of data from the PN532 via SPI @param buff Pointer to the buffer where data will be written @param n Number of bytes to be read */ /**************************************************************************/ void Adafruit_PN532::readspidata(uint8_t* buff, uint8_t n) { digitalWrite(_ss, LOW); delay(2); spiwrite(PN532_SPI_DATAREAD); #ifdef PN532DEBUG Serial.print("Reading: "); #endif for (uint8_t i=0; i