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This function takes an already initialized USB device list, searches for Trenz Electronic USB FX2 devices (Cypress driver derivative and VID = 0xbd0, PID=0x0300) connected to host computer's USB ports and counts them.
An internal operation that closes an handle to the CyUSB.sys driver (or a derivative like TE_USB_FX2_xx.sys) is executed instead (see page 33 of CyAPI.pdf).
If one or more devices are attached and
- if 0 ≤ CardNumber ≤ (number of attached devices – 1), thenthe selected module is not directly given by USBDeviceList (CCyUSBDevice type). An internal operation that opens a handle to CyUSB.sys driver (or a derivative like TE driver) is executed instead (see page 45 of CyAPI.pdf). This handle is internally managed by CyAPI.lib, therefore there is no need to expose them to the user.
- if CardNumber ≥ number of attached devices, thenUSBDeviceList (CyUSBDevice type) is not initialized to null (the device list is not erased). An internal operation that closes an handle to CyUSB.sys driver (or a derivative like TE driver) is executed instead (see page 33 of CyAPI.pdf).
| Info |
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| A more intuitive name for this function would have been TE_USB_FX2_SelectCard(). |
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| You can use this function to select the desired module without the need to call TE_USB_FX2_Close() before. Though doing so would not cause any problems. Close() is automatically carried out by the TE_USB_FX2_Open() function if a handle to the driver is already open (i.e. a TE_USB_FX2_Open() has been successfully called before). |
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If no device is attached, USBDeviceList is not initialized to null (the device list is not erased). |
Description of internal procedure
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Overview
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