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Chapter 9
An HID device is defined by a Vendor ID (VID) and Product ID (PID). The VID and PID
will be retrieved by the host during the enumeration to build a string identifying the HID
device. The “HID - Control” and “HID - Interrupt” projects contain both a file named
app_hid_common.c . This file declares the following local constant:
9
static
const
TCHAR
App_DevPathStr[] = _TEXT("hid#vid_fffe&pid_1234");
(1)
Listing 9-5 Windows Application and String to Detect a Specific HID Device
L9-5(1)
This constant allows the application to detect a specified HID device connected
to the host. The VID and PID given in App_DevPathStr variable must match
with device side values. The device side VID and PID are defined in the
USBD_DEV_CFG structure in the file usbd_dev_cfg.c . Refer to the section
“Modify Device Configuration” on page 34 for more details about the
USBD_DEV_CFG structure. In this example, VID = fffe and PID = 1234 in
hexadecimal format.
9-4-2 RUNNING THE DEMO APPLICATION
The mouse demo does not require anything on the Windows side. You just need to plug the
HID device running the mouse demo to the PC and see the screen cursor moving.
Figure 9-3 presents the mouse demo with the host and device interactions:
156
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Figure 9-3 HID Mouse Demo
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