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AN3985 датащи(PDF) 30 Page - STMicroelectronics |
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AN3985 датащи(HTML) 30 Page - STMicroelectronics |
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30 / 105 page ![]() ISO/IEC 15693 layer AN3985 30/105 Doc ID 022255 Rev 2 This structure is defined in ISO15693_structure.h. typedef struct { u8 command_ok; u8 error_code; u8 response_flags; u8 dataField[ISO15693_DATA_RECEIVED_MAX_SIZE]; u8 receivedDataLength; u8 UID_Tag[ISO15693_UID_SIZE]; u8 AFI_Tag; u8 DSFID_Tag; u8 ICRef; u8 memSize[ISO15693_MEMSIZE_MAX_WORD_BYTE_SIZE]; }ISO15693_Tag; 5.3 ISO/IEC 15693 command format The commands defined by ISO/IEC 15693 specification have the following structure : With: ● SOF: start of frame ● Request flag: 1 byte ● Command code: 1 byte ● Data: 1 or more byte ● CRC: 2 bytes ● EOF: end of frame 5.3.1 SOF and EOF The SOF and EOF are managed by CR95HF device. 5.3.2 Request flag management The request flags byte is managed by the user application. Each bit or flag specifies the actions to be carried out by the contactless tag and whether the corresponding fields are present or not. The request flags is a byte integrated on all ISO/IEC 15693 commands, which specifies the actions to be performed by the contactless tag. The meaning of bit 1, 2 and 4 is the same for all ISO/IEC 15693 commands. Bit 3 (Inventory_flag) of the request flag defines the contents of the 4 MSBs (bits 5 to 8). When bit 3 is reset (0), bits 5 to 8 contain the contactless tag selection criteria. When bit 3 is set (1), bits 5 to 8 define the contactless tag Inventory parameters. SOF Request flag Command code Data CRC EOF |
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