AN3224 datasheet(20/49 Pages) STMICROELECTRONICS

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PR101-USB and MR101-USB reader detection

AN3224

20/49

Doc ID 17559 Rev 2

4.2

Detection and connection sequence

The sequence required to perform reader detection and connection is the following:

Call the FEUSB_ClearScanList function to re-initialize the USB detection process.

Call the FEUSB_Scan function to create the list of USB readers connected to the host

ports. The list is stored in the oSearch variable. An error code is sent back if no reader

have been detected.

Call the FEUSB_GetScanListSize function to obtain the number of detected

readers.

Call the FEUSB_GetScanListPara function to retrieve the data related to the

detected readers, together with the identifiers (Device-ID) assigned to each detected

reader.

Call the FEUSB_OpenDevice function to open a communication channel between an

USB reader, identified by Device-ID, and the FEUSB dll. The function sends back the

USB handle that will be used to manage further FEUSB communication with the

reader.

Call the FEISC_NewReader function to open a communication channel between an

USB reader, identified by its USB handle, and the FEISC dll. The function sends back

the attached device handle (lngAttachedDeviceHandle variable) that will be used to

manage further FEISC communication with the reader.

The detect_FEIG_USB_reader() function returns TRUE if a FEIG USB reader is

detected and FALSE otherwise.

When data transmissions and receptions have completed, call the

FEUSB_CloseDevice

function to close USB communication.

Hereafter are source code examples of reader detection and connection examples in Visual

Basic and C/C++.

4.3

Visual Basic source code example

‘--- global variable to manage FEUSB handle

Public glngFEUSBhandle as long

‘--- global variable to manage FEISC handle

Public lngAttachedDeviceHandle() as long

'--- Detect FEIG USB readers (detected=true, non-detected=false) ---

Private Function detect_USB_FEIG_reader() As Boolean

Dim Back As Long

Dim i As Long

Dim Cnt As Integer

Dim Char As String

Dim CharCnt As Integer

Dim oSearch As FEUSB_SCANSEARCH

Dim lngReaderNumber As Long

Dim error As Long

Dim DeviceHnd As Long

Dim lngDeviceId(0 To 15) As Long

Dim strFamilyName(0 To 15) As String

Dim strDeviceName(0 To 15) As String

Dim lngPresent(0 To 15) As Long

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