22 | 3M™ |
synchronous report in response to some of these requests.
You need to know product ID (0502H) and the vendor ID (0596H) to write your own driver. These values are required for identifying the controller.
Receiving Reports from the Controller
The controller sends a variety of reports to the computer. The first byte of each report is the Report ID that defines the structure and content of the report. The controller sends some reports as a direct response to a computer request (synchronous). The controller will also send some reports as the result of an external event, such as a touch (asynchronous).
Command Set
The USB command set is implemented by using HID Get Feature and Set Feature commands. The various requests and reports are grouped together by report size under a common feature ID.
HID Class Requests
The following table summarizes the available HID class requests.
Table 1. HID Class Requests Summary
| HID Report |
| Command |
| bmRequest |
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| bRequest |
| Feature |
| Report | Data |
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| Name |
| Type |
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| Report ID |
| Subtype | Stage |
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| Bytes |
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| Get Feature | GetStatus | 0xA1 (D2H) | 0x01 |
| 0x06 | 8 | ||||||
| Set Feature | Calibrate | 0x21 (H2D) | 0x09 | 0x03 | 4 | 8 | ||||||
| Set Feature | Reset | 0x21 (H2D) | 0x09 |
| 0x03 | 7 | 8 | |||||
| Set Feature | Restore Defaults | 0x21 (H2D) | 0x09 | 0x03 | 8 | 8 | ||||||
| Get Feature | GetMaxCount | 0xA1 (D2H) |
| 0x01 |
| 0x12 | 2 | |||||
Set Feature - Calibration
This is a command to do a Calibrate Extended style calibration. The controller will auto- orient on this 2 point calibration.
