AN2284 datasheet(36/40 Pages) STMICROELECTRONICS

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10 SC Reader Example

AN2284

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PublicDir[3]={0xDD,0x00,DF};

Figure 12. Smart Card Example: File System Description

At the end of the example:

- the

PrivateDir directory will contains the PrivateFile file;

- the

PublicDir directory will contains the PublicFile file;

- the

MasterRoot directory will contains the PwdFile file;

The definition and the related file identifier code:

PrivateFile[3]={0xCA,0xA1,EF};

PublicFile[3]={0xCD,0x00,EF};

PwdFile[3]={0xDD,0xDD,EF};

10.2.1 Smart Card Start Up: 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 user has to invoke the SC_Handler as follows:

SC_state=SC_POWER_ON;

while (SC_state!=SC_ACTIVE_ON_T0)

SC_Handler (SC_GET_A2R, pvoid, NULL_PARAM, NULL_PARAM,

NULL_PARAM, &SC_state, &u16_status, card);

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

recognized protocol is the T0 protocol, the smart card state of the reader will be active

(SC_ACTIVE_ON_T0) and the smart card will be available for operations on the file system.

10.2.2 Reading a File at aSpecified Path

Suppose the specified path reading begins is:

MasterRoot/PrivateDir/PrivateFile

To reach it the user has to perform the following actions:

SC_Handler (SC_SELECT_FILE, (u8 *) MasterRoot, NULL_PARAM, NULL_PARAM,

NULL_PARAM, &SC_state, &u16_status, card);

SC_Handler (SC_SELECT_FILE, (u8 *) PrivateDir, NULL_PARAM, NULL_PARAM,

NULL_PARAM, &SC_state, &u16_status, response);

AN2284 Datasheet(PDF) 36 Page - STMicroelectronics