26 3M? Multi-touch Display M2256PW User Guide
3M Touch Systems, Inc. Proprietary Information – 37531 Rev D
Table 10. Data Stage (controller response)
Offset
Field
Size
Value
Description
0 Report ID 1 0x12 Feature Report ID
1 Max Count 1 0x1E Number of actual 30 fingers
supported
Note:
The number of actual contacts reported may exceed this number (possibly up to
60).
Set Feature - Reset
This is a request to perform a controller reset. Soft resets are automatic after any block
parameter changes.
Table 11. Reset - Setup Stage
Offset
Field
Size
Value
Description
0 bmRequestType 1 0x21 Class,H2D,Interface
1 bRequest 1 0x09 Set Report
2 wValue 2 0x0303 msb=03=Feature
lsb=03= Feature Report ID
4 wIndex 2 0 Always 0
6 wLength 2 8 Always 8
Table 12. Reset – Data Stage
Offset
Field
Size
Value
Description
0 Report ID 1 0x03 Feature Report ID
1 Report Subtype 1 0x07 Indicates a reset request
2 bResetType 1 0x01 Soft Reset
0x02
Hard Reset
3--7 5 0 Not used
A Hard Reset will cause the controller to re-enumerate.
In the case of a Soft Reset, after sending the command, the controller will acknowledge
(ACK) the transfer, but the command will not
yet be completed. Before sending any
other commands, the host should poll with GetStatus until the command status field
returns “Soft Reset Occurred,” “Command Complete,” or “Fail”. Any timeout for this
status polling should be 2 seconds minimum.
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