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DEVELOPING A USB SMARTCARD READER WITH ST7SCR

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unsigned char CRD_VccOn(unsigned char Voltage)

three possible voltage values:

– CRD_Voltage18V (for 1.8 volts)

– CRD_Voltage3V (for 3.0 volts)

– CRD_Voltage5V (for 5.0 volts)

This function returns one of the following error codes:

– Slot_No_Error

– SlotError_HW_Error

– SlotError_ICC_Mute (no card present)

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void CRD_VccOff(void)

ware.

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void CRD_SetMode(unsigned char Mode)

This function sets the operating mode of the CRD. There are two operating modes:

– CRD_ManualMode

– CRD_UARTMode

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void CRD_SetConvention(unsigned char Convention)

This function sets the convention used by the CRD to communicate with the ICC. There are

two conventions:

– CRD_DirectConv

– CRD_InverseConv

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unsigned char CRD_GetSlotStatus(void)

This function returns the current status of the slot (only 1 slot is possible with this device).

There are three possible states for the slot:

– CRD_NotPresent

– CRD_PresentInactive

– CRD_PresentActive