AN2646 datasheet(29/43 Pages) STMICROELECTRONICS

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AN2646 - Application note

Smartcard interface library: description

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typedef struct

{

u8 LC;

/* Data field length */

u8 Data[LCmax];

/* Command parameters */

u8 LE;

/* Expected length of data to be returned */

} SC_Body;

●

Specifies the number of data bytes transferred to the card as part of the [CLA, INS]

instruction execution.

●

Data

Specifies the pointer to the data buffer transferred to the card.

●

Specifies the number of data bytes transferred from the card as part of the [CLA, INS]

instruction execution.

●

SC_Response

Specifies the APDU command response. It is of SC_ADPU_Response type, defined in

the smartcard.h file:

typedef struct

{

u8 Data[LCmax];

/* Data returned from the card */

u8 SW1;

/* Command Processing status */

u8 SW2;

/* Command Processing qualification */

} SC_ADPU_Responce;

●

Data

Specifies the pointer to the data buffer which will contain the returned card data.

●

SW1

Specifies the first status code byte. This byte stores the error category.

●

SW2

Specifies the second status code byte. This byte stores a command-specific status or

error indication.

Example:

/* Select the Master Root MF */

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] = MasterRoot[i];

}

while(i < LCmax)

{

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

}

SC_ADPU.Body.LE = 0;

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

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