24 | 3M™ |
The Calibrate Extended command then positions the first calibration target inward from the lower left corner (0,1049) and the second calibration target inward from the upper right corner (1679,0). The following illustration shows how the calibration targets are calculated for a
The illustration below shows the coordinates of the calibration targets and display corners. The corners show the video coordinates in parentheses and the touch screen coordinates in brackets.
(0, 0) [0, 0] | (1679, 0) [32767, 0] |
Lower Left Calibration Target
X = 0 + (1680 x 1/8) = 0 + 210 = 210 Y = 1049 - (1050 x 1/8) = 1049 - 131 = 918
(1469, 131) 
(210, 918)
Upper Right Calibration Target
X = 1679 – (1680 x 1/8) = 1679 – 210 = 1469 Y = 0 + (1050 x 1/8) = 0 + 131 = 131
(0, 1049) [0, 32767] | (1679, 1049) | [32767, 32767] |
Get Feature - GetStatus
This is a request to send information that indicates the status of the controller. Among the uses for this request are determining whether there were any power on check errors and determining whether the last request was completed successfully.
Table 5. Controller Status Setup Stage
Offset | Field | Size | Value | Description | |
0 | bmRequestType | 1 | 0xA1 | Class,D2H,Interface | |
1 | bRequest | 1 | 0x01 | Get Report | |
2 | wValue | 2 | 0x0306 | msb=03=Feature | |
|
|
|
| lsb=06= Feature Report ID | |
4 | wIndex | 2 | 0 | Always 0 | |
6 | wLength | 2 | 8 | Always 8 |
Table 6. Controller Status Data Stage (controller response)
Offset | Field | Size | Value | Description | |
0 | Report ID | 1 | 0x06 | Feature Report ID | |
1 | POC Status | 1 | 0xXX | Power On Check Status | |
2 | Cmd Status | 1 | 0xXX | Status of last command | |
3 | Touch Status | 1 | 0 | Not used | |
4 | Async Reports | 1 | 0xXX | 0x00 = async touch output off | |
|
|
|
| 0x01 = async touch output on | |
Not used | 3 | 0 | Not used |
3M Touch Systems, Inc. Proprietary Information – 37531 Rev D
