AN2646 datasheet(32/43 Pages) STMICROELECTRONICS

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Smartcard interface library: description

AN2646 - Application note

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6.3

How to send APDU commands to the smartcard

A detailed description on how to use the SC_Handler( ) function to send the ADPU

command to the smartcard and retrieve the card response is described below. The user has

to update the SC_CLA and the smartcard instruction values according to the smartcard

specifications.

6.3.1

SC_GET_A2R

SC_ADPU.Header.CLA = 0x00;

SC_ADPU.Header.INS = SC_GET_A2R;

SC_ADPU.Header.P1 = 0x00;

SC_ADPU.Header.P2 = 0x00;

SC_ADPU.Body.LC = 0x00;

while(SCState != SC_ACTIVE_ON_T0)

{

SC_Handler(&SCState, &SC_ADPU, &SC_Responce);

}

●

SCState: It stores the current smartcard state.

●

SC_ATR_Table: Pointer to an array (filled in by the SC_Handler function) that

contains the smartcard ATR frame.

6.3.2

SELECT_FILE

SC_ADPU.Header.CLA = SC_CLA;

SC_ADPU.Header.INS = SC_SELECT_FILE;

SC_ADPU.Header.P1 = 0x00;

SC_ADPU.Header.P2 = 0x00;

SC_ADPU.Body.LC = 0x02;

for(i = 0; i < SC_ADPU.Body.LC; i++)

{

SC_ADPU.Body.Data[i] = FileName[i];

}

while(i < LCmax)

{

SC_ADPU.Body.Data[i++] = 0;

}

SC_ADPU.Body.LE = 0;

SC_Handler(&SCState, &SC_ADPU, &SC_Responce);

●

FileName: It contains the 16 bit file identifier.

●

SCState: It stores the current smartcard state.

●

SC_Response->SW1 and SC_Response->SW2: they return the smartcard response

to the SC_SELECT_FILE command.

6.3.3

SC_GET_RESPONSE

SC_ADPU.Header.CLA = SC_CLA;

SC_ADPU.Header.INS = SC_GETRESPONSE;

SC_ADPU.Header.P1 = 0x00;

SC_ADPU.Header.P2 = 0x00;

SC_ADPU.Body.LC = 0x00;

i = 0;

while(i < LCmax)

{

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