3M M2256PW manual Set Feature Reset, Reset Setup Stage Offset Field Size Value Description

26				3M™ Multi-touch Display M2256PW User Guide
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.

3M Touch Systems, Inc. Proprietary Information – 37531 Rev D