AN2646 datasheet(27/43 Pages) STMICROELECTRONICS

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AN2646 - Application note

Smartcard interface library: description

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6.2.1

SC_Handler function

SCState

SCState informs the user about the smartcard state and allows the user to power off the

smartcard. It can take one of the values defined in Table 12 below.

Function name

SC_Handler

Function prototype

void SC_Handler(SC_State *SCState, SC_ADPU_Commands *SC_ADPU,

SC_ADPU_Responce *SC_Response)

Behavior description

Handles all smartcard states and serves to send and receive all

communication data between smartcard and reader.

Input parameter1

SCState: pointer to an SC_State enumeration that will contain the

smartcard state.

Input parameter2

SC_ADPU: pointer to an SC_ADPU_Commands structure that will be

initialized.

Input parameter3

SC_Response: pointer to a SC_ADPU_Responce structure which will be

initialized.

Output parameter

None

Return parameter

None

Required preconditions

None

Called functions

None

Table 12.

SCState

Meaning

SC_POWER_OFF

No power is provided to the smartcard (VCC = 0); the STM8S20x smartcard

interface is disabled. No clock is provided to the smartcard.

SC_POWER_ON

The smartcard peripheral is enabled and initialized; no power is provided to

the smartcard; no clock is provided to the smartcard.

SC_RESET_LOW

In this state, the RST smartcard pin (pin 2) is driven low (RST = 0). VCC =

5 V is provided to the smartcard; clock CLK is provided to the smartcard.

Answer to reset (ATR) procedure begins. The reader waits for an ATR frame

from the smartcard.

SC_RESET_HIGH

If no answer is received, the reader forces the reset pin RST high (RST = 1)

and holds it high until it receives an answer to reset.

SC_ACTIVE

If an answer to reset is received, the reader goes in active state and

decodes the ATR frame. It returns information about the used protocol.

SC_ACTIVE_ON_T0

If the used protocol is T0, the reader goes in SC_ACTIVE_ON_T0 state and

commands can then be sent to the smartcard.

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