AN3375 datasheet(14/73 Pages) STMICROELECTRONICS

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CR95HF low level layer

AN3375

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Doc ID 018637 Rev 1

For more details concerning this command, refer to ISO15693 specifications.

2.3.4

SendRecv function

This function sends a SendRecv command. The parameter passed to the command is the

frame which is coded according to the protocol previously selected by issuing a Protocol

Select command. The CR95HF encodes the frame, transmits it at 13.56 MHz, and decodes

the contactless tag response.

The contactless tag response is then sent back in the pResponse parameter.

The input parameter depends on the selected protocol. Table 8 gives ISO15693 protocol

parameters.

If the CR95HF_SendRecv function is successful, it returns the CR95HF_SUCCESS_CODE

code (see Table 9)

Table 7.

CR95HF_SendRecv function description

Function description

Prototype

result = int8_t CR95HF_SendRecv (uc8

Length,uc8 *Parameters,uint8_t *pResponse)

Input parameter

Length: Number of bytes in Parameters

Parameters: pointer to data

Output parameter

pResponse : pointer to CR95HF response

Return parameter

CR95HF_ERRORCODE_PARAMETER: function failed

CR95HF_SUCCESS_CODE: function successful

CR95HF_ERRORCODE_PARAMETERLENGTH: parameter

length is erroneous

Table 8.

CR95HF_SendRecv ISO15693 protocol parameters

Parameter name

Byte

Bit

Value

Example

Command Code

7:0

0x04

0x0403260100

Length

7:0

0xXX

Data

2:X

7:0

0xXX

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