AN2646 datasheet(38/43 Pages) STMICROELECTRONICS

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Smartcard interface example

AN2646 - Application note

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Figure 12.

Smartcard example: file system description

At the end of the example:

●

The ICCID file located under the MasterRoot directory is read

●

The IMSI file, under GSMDir, that has a secure access through PIN1, is read

●

The PIN1 is enabled/disabled

7.2.1

Smartcard startup: answer to reset (A2R)

The first action to perform when the reader wants to access a card is the answer-to-reset

procedure. To this aim the SC_Handler is invoked as follows:

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);

}

When a card is detected, the A2R sequence is generated, received and decoded. If the

recognized protocol is the T0 protocol, the smartcard state of the reader is active

(SC_ACTIVE_ON_T0) and the smartcard is available for operations on the file system.

The procedure type selection (PTS) will be applied after the ATR using the SC_PTSConfig()

function. For the used GSM card, the PTS procedure is as follows:

PTSS = 0xFF

PTS0 = 0x10

PTS1 = 0x95

PCK = 0x7A

PTS1 = 0x95, F = 9 and D = 5, Fi = 512, Di = 16, BaudRate = 112500 baud.

7.2.2

Reading a file at a specified path

The specified reading path is assumed to be: MasterRoot/GSMDir/IMSI

To reach it, the following actions are performed:

●

Select GSMDir using a SelectFile APDU command

●

Select IMSI File using a SelectFile APDU command

The user has to get the file characteristics to check its access conditions. The IMSI file has a

CHV1(PIN1) read condition, so PIN1 has to be checked before reading it. The verify

command must be executed under the directory containing the file to be read, the GSMDir

must be selected in the example.

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