AN3985 datasheet(79/105 Pages) STMICROELECTRONICS

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AN3985

M24LRxx layer

Doc ID 022255 Rev 2

79/105

M24LRxx_Fast_Read_Multiple_Block function

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

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

case).

Received data is stored into the internal EEPROM of the MCU.

M24LRxx_Inventory_Initiated function

This function sends, through the CR95HF, a fast inventory command to a contactless tag in

the field.

Table 134.

M24LRxx_Fast_Read_Multiple_Block function description

Prototype

u8 M24LRxx_Fast_Read_Multiple_Block(ISO15693_Tag* MyTag,

const u8 Request_flags, const u8* Tag_UID, const u8

First_Block_number, const u8 Number_of_Blocks);

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)

First_Block_number: address of the first block to read (3)

Number_of_Blocks: number of blocks to read after the first one

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.

Table 135.

M24LRxx_Inventory_Initiated function description

Prototype

u8 M24LRxx_Inventory_Initiated(ISO15693_Tag* MyTag, const

u8 Request_flags, const u8 Tag_AFI, const u8 MaskLength,

const u8* Mask, u8* Inventory_16_slots_Nb_UID_Retrieved);

Input parameter

Request_flags: specifies the actions to be performed by the contactless tag and

whether corresponding fields are present or not.

Tag_AFI: AFI field to select a contactless tag family (optional) (1)

MaskLength: length of the mask for transmitting (2)

Mask: the mask to transmit

Inventory_16_slots_Nb_UID_Retrieved: pointer to retrieve the number of tags

seen during the inventory 16 slots.

AFI field is added if AFI flag of requests flags is

For example, to transmit a part of the UID of one tag. Masklength represents the numbers of significant

bits. The user should ensure that others bits are reset for padding.

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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