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AN3375

ISO15693 library (intermediate layer)

Doc ID 018637 Rev 1

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ISO15693 library (intermediate layer)

The library is composed of:

●

The ISO15693.c source file

●

The ISO15693.h include file

3.1

ISO15693 command format

Figure 4 shows ISO15693 command format.

Figure 4.

Format of ISO15693 commands

Where

●

SOF: start of frame

●

Request flag: 1 byte

●

Command code: 1 byte

●

Data: 1 or more bytes

●

CRC: 2 bytes

●

EOF: end of frame

3.1.1

EOF and SOF

The EOF and SOF are managed by the CR95HF.

3.1.2

CRC management

The ISO15693 standard specifies a two-byte CRC which it appended to the ISO15693

command and allows to check the integrity of data transmission between CR95HF and

contactless tag.

The two-byte CRC can be either computed by the user or by the CR95HF device, depending

on the value of the AppendCRC input parameter:

●

If AppendCRC is set to ‘0’, the CRC is calculated by the user application.

●

If AppendCRC is set to ‘1’, the CRC is calculated by the CR95HF. This configuration is

recommended to avoid calculation errors.

The CRC16 input parameter is appended to ISO15693 commands if the user has chosen to

manage the CRC.

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