AN3985 datasheet(70/105 Pages) STMICROELECTRONICS

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M24LRxx layer

AN3985

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Doc ID 022255 Rev 2

M24LRxx_Read_Single_Block function

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

in the field.

M24LRxx_Write_Single_Block function

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

in the field.

Table 116.

M24LRxx_Read_Single_Block function description

Prototype

u8 M24LRxx_Read_Single_Block(ISO15693_Tag* MyTag, const u8

Request_flags, const u8* Tag_UID, const u16 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) (2)

Tag_UID: pointer on the UID (optional)

block_number: address of the block to read (3)

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

If the memory size is more than 8 kbit, the protocol extension flag of request flags should be set.

If the memory size is more than 8 kbit, the block number is composed by two bytes.

Output parameter

MyTag: pointer on the structure that contains the tag response

Return parameter

ISO15693_COMMAND_ERROR_CODE: The command failed.

ISO15693_ERROR_REQUEST_FLAGS_CODE: The inventory flag is set.

ISO15693_COMMAND_SUCCESS_CODE: The tag answered the command.

Table 117.

M24LRxx_Write_Single_Block function description

Prototype

u8 M24LRxx_Write_Single_Block(ISO15693_Tag* MyTag, const u8

Request_flags, const u8* Tag_UID, const u16 Block_number,

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) (2)

Tag_UID: pointer on the UID (optional)

block_number: address of the block to read (3)

Data: data to write into the contactless tag memory

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

If the memory size is more than 8 kbit, the protocol extension flag of request flags should be set.

If the memory size is more than 8 kbit, the block number is composed by two bytes.

Output parameter

MyTag: pointer on the structure that contains the tag response

Return parameter

M24LRxx_ERROR_CODE: The command failed.

M24LRxx_ERROR_PARAMETERS_REQUEST_FLAGS: The inventory flag is

set.

M24LRxx_SUCCESS_CODE: The tag answered the command.

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