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AN1527 Datasheet(PDF) 3 Page - STMicroelectronics

Part # AN1527
Description  DEVELOPING A USB SMARTCARD READER WITH ST7SCR
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1527 Datasheet(HTML) 3 Page - STMicroelectronics

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DEVELOPING A USB SMARTCARD READER WITH ST7SCR
To finish the main loop, the CCID_BulkInMessage() function sends the Bulk-in message as an
answer to the previous Bulk-out message. The message is sent in a process that requires sev-
eral Bulk-in transactions (same concept as for the Bulk-out process).
In addition, the Abort request is implemented through the CCIDClassRequestAbort() function
called in the USB_Polling() function. For this purpose, the USB_Polling() function is called in
the PC_to_RDR_xxx() function. When this request is received from endpoint 0, a flag is set
and the command sequence number is memorized.
All commands are aborted until the next PC_to_RDR_Abort command with the correct se-
quence number is received.
1.2 FUNCTION DESCRIPTION
s
void CCID_Init(void)
This function initializes the flags and status variables for the state machine process.
s
void CCID_Init_IT(void)
This function initializes the state machine and switches off the VccCard after a USB reset
done by the PC Host. It can only be called by an interrupt routine.
s
void CCID_Suspend_IT(void)
This function initializes the state machine and the card interface hardware after a resume from
USB suspend mode.
s
void CCID_BulkOutMessage(void)
This function manages the state machine during USB Bulk Out message reception. It fills the
message buffer with a maximum of 271 bytes.
s
void CCID_BulkInMessage(void)
This function manages the state machine during the USB Bulk In message transmission. It
sends the buffer content as a message with a maximum of 271 bytes.
s
void CCID_DispatchMessage(void)
This function identifies the USB Bulk Out received message and calls the corresponding func-
tions to process it : PC_to_RDR_xxx() and RDR_to_PC_xxx().
s
void CCID_IntMessage(void)
This function verifies the slot status and sends an interrupt In message if needed.


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