AN3985 datasheet(38/105 Pages) STMICROELECTRONICS

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ISO/IEC 15693 layer

AN3985

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Doc ID 022255 Rev 2

5.4.2

ISO/IEC 15693 command functions

The functions described in this chapter send an ISO/IEC 15693 command.

ISO15693_Inventory function

This command emits an inventory command to contactless tag.

Note:

If the inventory flag is not set, the function returns an error code.

ISO15693_StayQuiet function

This function emits a StayQuiet command to Contactless tag.

Table 51.

ISO15693_Inventory function description

Prototype

u8 ISO15693_Inventory(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 (1).

Tag_AFI: AFI field to select a contactless tag family (2)(optional)

MaskLength: length of the mask for transmitting (3)

Mask: the mask to transmit

Inventory_16_slots_Nb_UID_Retrieved: pointer to retrieve the number of tags

seen during the inventory 16 slots

Inventory shall be set.

AFI field is added if AFI flag of request flags is set

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

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

Output parameter

MyTag: pointer on the structure

Return parameter

SO15693_ERROR_CODE: The command failed. Either there is no tag or the

tag did not manage to perform the request.

ISO15693_ERROR_PARAMETERS_REQUEST_FLAGS: There is an error

within the request flags parameters.

ISO15693_COMMAND_SUCCESS_CODE: Tag answered the command.

Table 52.

ISO15693_StayQuiet function description

Prototype

u8 ISO15693_Stay_Quiet(const u8 Request_flags, const

u8* Tag_UID)

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)

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

Output parameter

None

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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