AN3985 datasheet(39/105 Pages) STMICROELECTRONICS

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AN3985

ISO/IEC 15693 layer

Doc ID 022255 Rev 2

39/105

ISO15693_Read_Single_Block function

This function sends, through the CR95HF, a read single block command to the contactless

tag in the field.

ISO15693_Write_Single_Block function

This function sends, through the CR95HF, a write single block command to the contactless

tag in the field.

Note:

According to ISO/IEC 15693 specification, the WriteSingleBlock command supports the

Option Flag.

If the Option_flag is not set, the contactless tag shall return its response when it has

completed the write operation.

If it is set, the contactless tag waits for an EOF pulse from the CR95HF.

Table 53.

ISO15693_Read_Single_Block function description

Prototype

u8 ISO15693_Read_Single_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 stores the data read from the tag

Return parameter

ISO15693_COMMAND_ERROR_CODE:The command failed. Either there is

no tag or the tag did not manage to perform the request.

ISO15693_ERROR_REQUEST_FLAGS_CODE: The inventory flag is set.

ISO15693_COMMAND_SUCCESS_CODE: Tag answered the command.

Table 54.

ISO15693_Write_Single_Block function description

Prototype

u8 ISO15693_Write_Single_Block(ISO15693_Tag* MyTag,

const u8 Request_flags, const u8* Tag_UID, const u8

Block_number,const u8 Block_Length, const u8* Data)

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

Block_Length: number of bytes in a block

Data: pointer to data to write into contactless tag memory

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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