AN3985 datasheet(75/105 Pages) STMICROELECTRONICS

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AN3985

M24LRxx layer

Doc ID 022255 Rev 2

75/105

M24LRxx_Inventory_Initiated function

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

the field.

M24LRxx_Fast_Inventory_Initiated function

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

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

Note:

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

Table 126.

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 set.

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

The user should ensure that other 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.

Table 127.

M24LRxx_Fast_Inventory_Initiated function description

Prototype

u8 M24LRxx_Fast_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 set

For example to transmit a part of the UID of one tag. Masklength represents the number of significant bits.

The user should ensure that other 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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