NDEF C Reference¶

Defines

URL_RECORDTYPE¶: NDEF record type for a URL.

URL_RECORDTYPE_LEN¶: Length of the NDEF record type in bytes.

SMPLINTKEY_LEN¶: Length of the sample interval key string in bytes.

SMPLINTB64_LEN¶: Length of the encoded sample interval string in bytes.

SERIALKEY_LEN¶: Length of the serial key string in bytes.

VERKEY_LEN¶: Length of the vfmt key string in bytes.

VFMTB64_LEN¶: Length of the encoded VFmt data in bytes.

STATKEY_LEN¶: Length of the status key string in bytes.

STATB64_LEN¶: Length of the encoded status string in bytes.

CBUFKEY_LEN¶: Length of the circular buffer key string in bytes.

NDEF_RECORD_HEADER_LEN¶: Length of the NDEF record header in bytes.

TL_LEN¶: Length of the Tag and Length fields of the NDEF message TLV in bytes.

TAG_NDEF_MESSSAGE¶: Tag indicating the TLV block contains an NDEF message.

WELLKNOWN_TNF¶: Record Type follows the Record Type Definition (RTD) format.

URI_ID_HTTP¶: URI Identifier Code for the HTTP protocol.

URI_ID_HTTPS¶: URI Identifier Code for the HTTPS protocol.

Functions

static void ndef_createurlrecord(int *eepindex, int msglenbytes, int httpsDisable)¶

Create a URL NDEF Record.

Parameters

eepindex – Position in the 64-byte array that buffers data to be written into EEPROM.
msglenbytes – NDEF Message Length in bytes.

void ndef_calclen(int *paddinglen, int *preamblenbytes, int *urllen)¶

int ndef_writepreamble(int buflenblks, char *statusb64)¶

Write the part of the URL before the circular buffer.

Parameters

buflenblks – Circular buffer length in 16-byte EEPROM blocks.
statusb64 – Pointer to a base64 encoded status structure.

Returns

1 if buflenblks is not even.

void ndef_writeblankurl(int buflenblks, char *statusb64, int *bufstartblk)¶

Write an NDEF message containing one URL record to EEPROM. The URL contains a circular buffer. This is populated with a placeholder text - all zeroes - initially.

Parameters

buflenblks – Circular buffer length in 16-byte EEPROM blocks.
statusb64 – Pointer to a base64 encoded status structure.
bufstartblk – The circular buffer start block is written to this pointer.

Variables

nv_t nv

static const char serialkey[] = "&s="¶: Seperator, key and equals before the serial string.

static const char cbufkey[] = "&q="¶: Seperator, key and equals before the circular buffer string.

static const char verkey[] = "&v="¶: Seperator, key and equals before the vfmt string.

static const char statkey[] = "&x="¶: Seperator, key and equals before the status string.

static const char smplintkey[] = "/?t="¶: Start of parameters followed by a key and equals for the sample interval string.

static const char zeropad[] = "MDAw"¶: 4 characters that base64 decode to 0,0,0

union TNFFlags_t¶

Public Members

unsigned char all¶

unsigned char tnf¶: Type Name Format field.

unsigned char idpresent¶: ID present flag. 1 if the ID field is present.

unsigned char srecord¶: Short record flag. 1 if the payload length field is 1 byte long.

unsigned char chunkflag¶: Chunk flag. 1 if this is the first or middle record in a chunked message.

unsigned char msgend¶: Message end flag. 1 if this is the last record in the message.

unsigned char msgbegin¶: Message begin flag. 1 if this is the first record in the message.

struct TNFFlags_t::[anonymous] byte¶

union len_t¶

Public Members

unsigned long all¶

unsigned char bytes[4]¶