AN3985 datasheet(40/105 Pages) STMICROELECTRONICS

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ISO/IEC 15693 layer

AN3985

40/105

Doc ID 022255 Rev 2

The CR95HF supports these two cases but it has to be configured before sending an Write

command.

This is the meaning of the Flag#3 of parameter of ProtocolSelect command (0: Ensure a

312 µs delay OR 1: Wait for SOF).

Table 55 shows the relationship between option flag of request_flag and:

●

312 µs delay; or,

●

wait for SOF

The ISO15693_Write_Single_Block function returns an error code if the Option Flag is

reset and 312 µs and SOF flag is reset.

If the option flag is set, the EOF pulse is managed by the

ISO15693_Write_Single_Block

function.

ISO15693_Lock_Block function

This function sends, through the CR95HF, a lock block command to the contactless tag in

the field or to an unique contactless tag designated by its UID.

Table 55.

ISO15693_Write_Single_Block results depending on Option flag

Option flag of RequestFlag

(312 µs or WaitSOF)

0 (set)

1 (reset)

0 (312 µs)

Ko (write worked out but CR95HF

does not detect the response tag)

Ok (but required to emit an EOF

pulse)

1 (Wait SOF)

Ok (but required to emit an EOF

pulse)

Table 56.

ISO15693_Lock_Block function description

Prototype

u8 ISO15693_Lock_Block(ISO15693_Tag* MyTag, const u8

Request_flags, const u8* Tag_UID, const u8

Block_number)

Input parameter

Request_flags: Specifies the actions to be performed by the contactless tag

and whether corresponding fields are present or not (1).

Tag_UID: pointer on the UID (optional)

block_number: address of the block to read

The Address flag indicates if Tag_UID field will be added to the command (addressed mode).

Output parameter

MyTag: pointer on the structure that contains the tag response

Return parameter

ISO15693_ERROR_CODE: The command failed.

ISO15693_ERROR_PARAMETERS_REQUEST_FLAGS: There is an error

within the request flags parameters.

ISO15693_SUCCESS_CODE: The contactless tag answered the command.

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