AN3985 datasheet(78/105 Pages) STMICROELECTRONICS

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M24LRxx layer

AN3985

78/105

Doc ID 022255 Rev 2

M24LRxx_Present_Sector_Password function

This function sends, through the CR95HF, a present sector password command to a

contactless tag in the field.

M24LRxx_Fast_Read_Single_Block function

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

contactless tag in the field. The datarate of the response is multiplied by 2 (52 kbit/s in this

case)

Table 132.

M24LRxx_Present_Sector_Password function description

Prototype

u8 M24LRxx_Present_Sector_Password(ISO15693_Tag* MyTag,

const u8 Request_flags, const u8* Tag_UID,const u8

Password_Number ,const u8* Password);

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)

Password_Number: number identifying the password (between 1 and 3)

Password: password to compare

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

M24LRxx_ERROR_CODE: The command failed.

M24LRxx_ERROR_PARAMETERS_REQUEST_FLAGS: The inventory flag is

set.

M24LRxx_SUCCESS_CODE: Tag answered the command.

Table 133.

M24LRxx_Fast_Read_Single_Block function description

Prototype

u8 M24LRxx_Fast_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 on 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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