API for the PN532 based NFC/RFID reader/writer. More...

Detailed Description

ID: pn532
Name: NFC/RFID Reader/Writer
Category: rfid
Manufacturer: adafruit
Link: http://www.adafruit.com/products/364
Connection: i2c

Identify a card and print out basic info

    // Instantiate an PN532 on I2C bus 0 (default) using gpio 3 for the
    // IRQ, and gpio 2 for the reset pin.
    upm::PN532 nfc(3, 2);
    if (!nfc.init())
        cerr << "init() failed" << endl;
    uint32_t vers = nfc.getFirmwareVersion();
    if (vers)
        printf("Got firmware version: 0x%08x\n", vers);
    else {
        printf("Could not identify PN532\n");
        return 1;
    }
    // Now scan and identify any cards that come in range (1 for now)
    // Retry forever
    nfc.setPassiveActivationRetries(0xff);
    nfc.SAMConfig();
    uint8_t uidSize;
    uint8_t uid[7];
    while (shouldRun) {
        memset(uid, 0, 7);
        if (nfc.readPassiveTargetID(nfc.BAUD_MIFARE_ISO14443A, uid, &uidSize, 2000)) {
            // found a card
            printf("Found a card: UID len %d\n", uidSize);
            printf("UID: ");
            for (int i = 0; i < uidSize; i++)
                printf("%02x ", uid[i]);
            printf("\n");
            printf("SAK: 0x%02x\n", nfc.getSAK());
            printf("ATQA: 0x%04x\n\n", nfc.getATQA());
            upm_delay(1);
        } else {
            printf("Waiting for a card...\n");
        }
    }

Add a URI to an already NDEF formatted ultralight or NTAG2XX tag

    // Instantiate an PN532 on I2C bus 0 (default) using gpio 3 for the
    // IRQ, and gpio 2 for the reset pin.
    upm::PN532 nfc(3, 2);
    if (!nfc.init())
        cerr << "init() failed" << endl;
    uint32_t vers = nfc.getFirmwareVersion();
    if (vers)
        printf("Got firmware version: 0x%08x\n", vers);
    else {
        printf("Could not identify PN532\n");
        return 1;
    }
    // Now scan and identify any cards that come in range (1 for now)
    // Retry forever
    nfc.setPassiveActivationRetries(0xff);
    nfc.SAMConfig();
    uint8_t uidSize;
    uint8_t uid[7];
    bool foundCard = false;
    while (!foundCard) {
        memset(uid, 0, 7);
        if (nfc.readPassiveTargetID(nfc.BAUD_MIFARE_ISO14443A, uid, &uidSize, 2000)) {
            // found a card
            printf("Found a card: UID len %d\n", uidSize);
            printf("UID: ");
            for (int i = 0; i < uidSize; i++)
                printf("%02x ", uid[i]);
            printf("\n");
            printf("SAK: 0x%02x\n", nfc.getSAK());
            printf("ATQA: 0x%04x\n\n", nfc.getATQA());
            foundCard = true;
        } else {
            printf("Waiting for a card...\n");
        }
    }
    if (uidSize != 7) {
        printf("This example will only write an NDEF URI to preformatted\n");
        printf("Mifare Ultralight or NTAG2XX tags\n");
        return 1;
    }
    // 48 bytes is maximum data area on ultralight cards, so we use that
    // as the maximum datasize here.  Obviously if you have a bigger
    // card, you can write more data.
    if (!nfc.ntag2xx_WriteNDEFURI(nfc.NDEF_URIPREFIX_HTTP, url, 48)) {
        // failure
        printf("Failed to write NDEF record tag.\n");
        return 1;
    }
    printf("Success, URL record written to tag.\n");

Public Types
enum	PN532_CMD_T { CMD_DIAGNOSE = 0x00, CMD_GETFIRMWAREVERSION = 0x02, CMD_GETGENERALSTATUS = 0x04, CMD_READREGISTER = 0x06, CMD_WRITEREGISTER = 0x08, CMD_READGPIO = 0x0C, CMD_WRITEGPIO = 0x0E, CMD_SETSERIALBAUDRATE = 0x10, CMD_SETPARAMETERS = 0x12, CMD_SAMCONFIGURATION = 0x14, CMD_POWERDOWN = 0x16, CMD_RFCONFIGURATION = 0x32, CMD_RFREGULATIONTEST = 0x58, CMD_INJUMPFORDEP = 0x56, CMD_INJUMPFORPSL = 0x46, CMD_INLISTPASSIVETARGET = 0x4A, CMD_INATR = 0x50, CMD_INPSL = 0x4E, CMD_INDATAEXCHANGE = 0x40, CMD_INCOMMUNICATETHRU = 0x42, CMD_INDESELECT = 0x44, CMD_INRELEASE = 0x52, CMD_INSELECT = 0x54, CMD_INAUTOPOLL = 0x60, CMD_TGINITASTARGET = 0x8C, CMD_TGSETGENERALBYTES = 0x92, CMD_TGGETDATA = 0x86, CMD_TGSETDATA = 0x8E, CMD_TGSETMETADATA = 0x94, CMD_TGGETINITIATORCOMMAND = 0x88, CMD_TGRESPONSETOINITIATOR = 0x90, CMD_TGGETTARGETSTATUS = 0x8A }

enum	PN532_RSP_T { RSP_INDATAEXCHANGE = 0x41, RSP_INLISTPASSIVETARGET = 0x4B }

enum	MIFARE_CMD_T { MIFARE_CMD_AUTH_A = 0x60, MIFARE_CMD_AUTH_B = 0x61, MIFARE_CMD_READ = 0x30, MIFARE_CMD_WRITE = 0xA0, MIFARE_CMD_TRANSFER = 0xB0, MIFARE_CMD_DECREMENT = 0xC0, MIFARE_CMD_INCREMENT = 0xC1, MIFARE_CMD_STORE = 0xC2, MIFARE_ULTRALIGHT_CMD_WRITE = 0xA2 }

enum	NDEF_URI_T { NDEF_URIPREFIX_NONE = 0x00, NDEF_URIPREFIX_HTTP_WWWDOT = 0x01, NDEF_URIPREFIX_HTTPS_WWWDOT = 0x02, NDEF_URIPREFIX_HTTP = 0x03, NDEF_URIPREFIX_HTTPS = 0x04, NDEF_URIPREFIX_TEL = 0x05, NDEF_URIPREFIX_MAILTO = 0x06, NDEF_URIPREFIX_FTP_ANONAT = 0x07, NDEF_URIPREFIX_FTP_FTPDOT = 0x08, NDEF_URIPREFIX_FTPS = 0x09, NDEF_URIPREFIX_SFTP = 0x0A, NDEF_URIPREFIX_SMB = 0x0B, NDEF_URIPREFIX_NFS = 0x0C, NDEF_URIPREFIX_FTP = 0x0D, NDEF_URIPREFIX_DAV = 0x0E, NDEF_URIPREFIX_NEWS = 0x0F, NDEF_URIPREFIX_TELNET = 0x10, NDEF_URIPREFIX_IMAP = 0x11, NDEF_URIPREFIX_RTSP = 0x12, NDEF_URIPREFIX_URN = 0x13, NDEF_URIPREFIX_POP = 0x14, NDEF_URIPREFIX_SIP = 0x15, NDEF_URIPREFIX_SIPS = 0x16, NDEF_URIPREFIX_TFTP = 0x17, NDEF_URIPREFIX_BTSPP = 0x18, NDEF_URIPREFIX_BTL2CAP = 0x19, NDEF_URIPREFIX_BTGOEP = 0x1A, NDEF_URIPREFIX_TCPOBEX = 0x1B, NDEF_URIPREFIX_IRDAOBEX = 0x1C, NDEF_URIPREFIX_FILE = 0x1D, NDEF_URIPREFIX_URN_EPC_ID = 0x1E, NDEF_URIPREFIX_URN_EPC_TAG = 0x1F, NDEF_URIPREFIX_URN_EPC_PAT = 0x20, NDEF_URIPREFIX_URN_EPC_RAW = 0x21, NDEF_URIPREFIX_URN_EPC = 0x22, NDEF_URIPREFIX_URN_NFC = 0x23 }

enum	BAUD_T { BAUD_MIFARE_ISO14443A = 0x00 }

enum	TAG_TYPE_T { TAG_TYPE_UNKNOWN = 0, TAG_TYPE_MIFARE_CLASSIC = 1, TAG_TYPE_NFC2 = 2 }

Public Member Functions
	PN532 (int irq, int reset, int bus=PN532_I2C_BUS, uint8_t address=PN532_DEFAULT_I2C_ADDR)

	~PN532 ()

bool	init ()

uint32_t	getFirmwareVersion ()
	Checks the firmware version of the PN5xx chip. More...

bool	sendCommandCheckAck (uint8_t *cmd, uint8_t cmdlen, uint16_t timeout=1000)
	Sends a command and waits a specified period for the ACK. More...

bool	SAMConfig (void)
	Configures the SAM (Secure Access Module) More...

bool	setPassiveActivationRetries (uint8_t maxRetries)

bool	readPassiveTargetID (BAUD_T cardbaudrate, uint8_t uid, uint8_t uidLength, uint16_t timeout)

bool	inDataExchange (uint8_t send, uint8_t sendLength, uint8_t response, uint8_t *responseLength)
	Exchanges an APDU with the currently inlisted peer. More...

bool	inListPassiveTarget ()
	'InLists' a passive target. PN532 acting as reader/initiator, peer acting as card/responder. More...

bool	mifareclassic_IsFirstBlock (uint32_t uiBlock)

bool	mifareclassic_IsTrailerBlock (uint32_t uiBlock)

bool	mifareclassic_AuthenticateBlock (uint8_t uid, uint8_t uidLen, uint32_t blockNumber, uint8_t keyNumber, uint8_t keyData)

bool	mifareclassic_ReadDataBlock (uint8_t blockNumber, uint8_t *data)

bool	mifareclassic_WriteDataBlock (uint8_t blockNumber, uint8_t *data)

bool	mifareclassic_FormatNDEF (void)

bool	mifareclassic_WriteNDEFURI (uint8_t sectorNumber, NDEF_URI_T uriIdentifier, const char *url)

bool	ntag2xx_ReadPage (uint8_t page, uint8_t *buffer)

bool	ntag2xx_WritePage (uint8_t page, uint8_t *data)

bool	ntag2xx_WriteNDEFURI (NDEF_URI_T uriIdentifier, char *url, uint8_t dataLen)

uint16_t	getATQA ()

uint8_t	getSAK ()

mraa::I2c &	i2cContext ()

void	pn532Debug (bool enable)

void	mifareDebug (bool enable)

TAG_TYPE_T	tagType ()

Protected Member Functions
bool	readAck ()
	Tries to read/verify the ACK packet.

bool	isReady ()
	Return true if the PN532 is ready with a response.

bool	waitForReady (uint16_t timeout)
	Waits until the PN532 is ready. More...

void	readData (uint8_t *buff, uint8_t n)
	Reads n bytes of data from the PN532 via SPI or I2C. More...

void	writeCommand (uint8_t *cmd, uint8_t cmdlen)
	Writes a command to the PN532, automatically inserting the preamble and required frame details (checksum, len, etc.) More...

Protected Attributes
mraa::Gpio	m_gpioIRQ

mraa::Gpio	m_gpioReset

mraa::I2c	m_i2c

Member Enumeration Documentation

enum PN532_CMD_T

PN532 commands

enum PN532_RSP_T

Response bytes

enum MIFARE_CMD_T

MIFARE commands

enum NDEF_URI_T

NDEF prefixes

enum BAUD_T

Card baud rates

enum TAG_TYPE_T

Tag types

Constructor & Destructor Documentation

PN532	(	int	irq,
		int	reset,
		int	bus = `PN532_I2C_BUS`,
		uint8_t	address = `PN532_DEFAULT_I2C_ADDR`
	)

pn532 constructor

Parameters

irq	pin to use for IRQ
reset	reset pin
bus	i2c bus to use
address	the address for this device

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~PN532 ( )

PN532 Destructor

Member Function Documentation

bool init ( )

set up initial values and start operation

Returns: true if successful

uint32_t getFirmwareVersion ( )

Checks the firmware version of the PN5xx chip

Returns: the chip's firmware version and ID; The chip's firmware version and ID

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bool sendCommandCheckAck	(	uint8_t *	cmd,
		uint8_t	cmdlen,
		uint16_t	timeout = `1000`
	)

sends a command and waits a specified period for the ACK

Parameters

cmd	Pointer to the command buffer
cmdlen	the size of the command in bytes
timeout	timeout before giving up (in ms)

Returns: true if everything is OK, false if timeout occurred before an ACK was received

Parameters

cmd	Pointer to the command buffer
cmdlen	The size of the command in bytes
timeout	timeout before giving up

Returns: 1 if everything is OK, 0 if timeout occurred before an ACK was received

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bool SAMConfig ( void )

configures the SAM (Secure Access Module)

Returns: true if successfully configured

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bool setPassiveActivationRetries ( uint8_t maxRetries )

sets the MxRtyPassiveActivation byte of the RFConfiguration register. By default the pn532 will retry indefinitely.

Parameters

maxRetries 0xFF to wait forever, 0x00..0xFE to timeout after maxRetries. 0x00 means try once, with no retries on failure.

Returns: true if everything executed properly, false for an error

Sets the MxRtyPassiveActivation byte of the RFConfiguration register

Parameters

maxRetries 0xFF to wait forever, 0x00..0xFE to timeout after mxRetries

Returns: 1 if everything executed properly, 0 for an error

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bool readPassiveTargetID	(	BAUD_T	cardbaudrate,
		uint8_t *	uid,
		uint8_t *	uidLength,
		uint16_t	timeout
	)

waits for an ISO14443A target to enter the field

Parameters

cardbaudrate	baud rate of the card, one of the BAUD_T values
uid	Pointer to the array that will be populated with the cards UID, up to 7 bytes
uidLength	Pointer to the variable that will hold the length of the card's UID.
timeout	the number of milliseconds to wait

Returns: true if everything executed properly, false for an error

Waits for an ISO14443A target to enter the field

Parameters

cardBaudRate	Baud rate of the card
uid	Pointer to the array that will be populated with the card's UID (up to 7 bytes)
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

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bool inDataExchange	(	uint8_t *	send,
		uint8_t	sendLength,
		uint8_t *	response,
		uint8_t *	responseLength
	)

exchanges an APDU (Application Protocol Data Unit) with the currently inlisted peer

Parameters

send	Pointer to data to send
sendLength	Length of the data to send
response	Pointer to response data
responseLength	Pointer to the response data length

Returns: true if everything executed properly, false for an error

Parameters

send	Pointer to data to send
sendLength	Length of the data to send
response	Pointer to response data
responseLength	Pointer to the response data length

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bool inListPassiveTarget ( )

'InLists' a passive target. PN532 acting as reader/initiator, peer acting as card/responder.

Returns: true if everything executed properly, false for an error

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bool mifareclassic_IsFirstBlock ( uint32_t uiBlock )

Indicates whether the specified block number is the first block in the sector (block 0 relative to the current sector)

Returns: true if it's the first block, false otherwise

Indicates whether the specified block number is the first block in the sector (block 0 relative to the current sector)

bool mifareclassic_IsTrailerBlock ( uint32_t uiBlock )

indicates whether the specified block number is the sector trailer

Returns: true if it's the trailer block, false otherwise

Indicates whether the specified block number is the sector trailer

bool mifareclassic_AuthenticateBlock	(	uint8_t *	uid,
		uint8_t	uidLen,
		uint32_t	blockNumber,
		uint8_t	keyNumber,
		uint8_t *	keyData
	)

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.

Parameters

uid	Pointer to a byte array containing the card UID
uidLen	The length (in bytes) of the card's UID (Should be 4 for MIFARE Classic)
blockNumber	The block number to authenticate. (0..63 for 1KB cards, and 0..255 for 4KB cards).
keyNumber	Which key type to use during authentication (0 = MIFARE_CMD_AUTH_A, 1 = MIFARE_CMD_AUTH_B)
keyData	Pointer to a byte array containing the 6 byte key value

Returns: true if everything executed properly, false for an error

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.

Parameters

uid	Pointer to a byte array containing the card UID
uidLen	The length (in bytes) of the card's UID (Should be 4 for MIFARE Classic)
blockNumber	The block number to authenticate. (0..63 for 1KB cards, and 0..255 for 4KB cards).
keyNumber	Which key type to use during authentication (0 = MIFARE_CMD_AUTH_A, 1 = MIFARE_CMD_AUTH_B)
keyData	Pointer to a byte array containing the 6 byte key value

Returns: 1 if everything executed properly, 0 for an error

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bool mifareclassic_ReadDataBlock	(	uint8_t	blockNumber,
		uint8_t *	data
	)

tries to read an entire 16-byte data block at the specified block address.

Parameters

blockNumber	The block number to read (0..63 for 1KB cards, and 0..255 for 4KB cards).
data	Pointer to the byte array that will hold the retrieved data (if any)

Returns: true if everything executed properly, false for an error

Tries to read an entire 16-byte data block at the specified block address.

Parameters

blockNumber	The block number to authenticate. (0..63 for 1KB cards, and 0..255 for 4KB cards).
data	Pointer to the byte array that will hold the retrieved data (if any)

Returns: 1 if everything executed properly, 0 for an error

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bool mifareclassic_WriteDataBlock	(	uint8_t	blockNumber,
		uint8_t *	data
	)

tries to write an entire 16-byte data block at the specified block address.

Parameters

blockNumber	The block number to write. (0..63 for 1KB cards, and 0..255 for 4KB cards).
data	The byte array that contains the data to write.

Returns: true if everything executed properly, false for an error

Tries to write an entire 16-byte data block at the specified block address.

Parameters

blockNumber	The block number to authenticate. (0..63 for 1KB cards, and 0..255 for 4KB cards).
data	The byte array that contains the data to write.

Returns: 1 if everything executed properly, 0 for an error

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bool mifareclassic_FormatNDEF ( void )

formats a Mifare Classic card to store NDEF Records

Returns: true if everything executed properly, false for an error

Formats a Mifare Classic card to store NDEF Records

Returns: 1 if everything executed properly, 0 for an error

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bool mifareclassic_WriteNDEFURI	(	uint8_t	sectorNumber,
		NDEF_URI_T	uriIdentifier,
		const char *	url
	)

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.

Parameters

sectorNumber	The sector that the URI record should be written to (can be 1..15 for a 1K card)
uriIdentifier	The uri identifier code (one of the NDEF_URI_T values
url	the uri text to write (max 38 characters).

Returns: true if everything executed properly, false for an error

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.

Parameters

sectorNumber	The sector that the URI record should be written to (can be 1..15 for a 1K card)
uriIdentifier	The uri identifier code (0 = none, 0x01 = "http://www.", etc.)
url	The uri text to write (max 38 characters).

Returns: 1 if everything executed properly, 0 for an error

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bool ntag2xx_ReadPage	(	uint8_t	page,
		uint8_t *	buffer
	)

read an entire 4-byte page at the specified address

Parameters

page	The page number (0..63 in most cases)
buffer	Pointer to the byte array that will hold the retrieved data (if any)

Returns: true if everything executed properly, false for an error

Tries to read an entire 4-byte page at the specified address.

Parameters

page	The page number (0..63 in most cases)
buffer	Pointer to the byte array that will hold the retrieved data (if any)

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bool ntag2xx_WritePage	(	uint8_t	page,
		uint8_t *	data
	)

write an entire 4-byte page at the specified block address

Parameters

page	The page number to write. (0..63 for most cases)
data	The byte array that contains the data to write. Should be exactly 4 bytes long.

Returns: true if everything executed properly, false for an error

Tries to write an entire 4-byte page at the specified block address.

Parameters

page	The page number to write. (0..63 for most cases)
data	The byte array that contains the data to write. Should be exactly 4 bytes long.

Returns: 1 if everything executed properly, 0 for an error

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bool ntag2xx_WriteNDEFURI	(	NDEF_URI_T	uriIdentifier,
		char *	url,
		uint8_t	dataLen
	)

writes an NDEF URI Record starting at the specified page (4..nn)

Note that this function assumes that the NTAG2xx card is already formatted to work as an "NFC Forum Tag".

Parameters

uriIdentifier	The uri identifier code (one of the NDEF_URI_T values
url	The uri text to write (null-terminated string).
dataLen	The size of the data area for overflow checks.

Returns: true if everything executed properly, false for an error

Writes an NDEF URI Record starting at the specified page (4..nn)

Note that this function assumes that the NTAG2xx card is already formatted to work as an "NFC Forum Tag".

Parameters

uriIdentifier	The uri identifier code (0 = none, 0x01 = "http://www.", etc.)
url	The uri text to write (null-terminated string).
dataLen	The size of the data area for overflow checks.

Returns: 1 if everything executed properly, 0 for an error

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uint16_t getATQA ( )

inline

return the ATQA (Answer to Request Acknowledge) value. This value is only valid after a successful call to readPassiveTargetID()

Returns: ATQA value

uint8_t getSAK ( )

inline

return the SAK (Select Acknowledge) value. This value is only valid after a successful call to readPassiveTargetID()

Returns: SAK value

mraa::I2c& i2cContext ( )

inline

provide public access to the class's MRAA i2C context for direct user access

Returns: a reference to the class i2c context

void pn532Debug ( bool enable )

inline

enable or disable debugging output for pn532 related operations

Parameters

enable true to enabloe debug output, false to disable

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void mifareDebug ( bool enable )

inline

enable or disable debugging output for mifare related operations

Parameters

enable true to enabloe debug output, false to disable

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PN532::TAG_TYPE_T tagType ( )

try to determine the tag type

Returns: one of the TAG_TYPE_T values

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bool waitForReady ( uint16_t timeout )

protected

Parameters

timeout Timeout before giving up

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void readData	(	uint8_t *	buff,
		uint8_t	n
	)

protected

Parameters

buff	Pointer to the buffer where data will be written
n	Number of bytes to be read

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void writeCommand	(	uint8_t *	cmd,
		uint8_t	cmdlen
	)

protected

Parameters

cmd	Pointer to the command buffer
cmdlen	Command length in bytes

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The documentation for this class was generated from the following files:

src/pn532/pn532.hpp
src/pn532/pn532.cxx

Detailed Description

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation