Get Feature - Get Max Count - 3M PX5 Series Reference Manual

3M™ Multi-Touch ASIC Controller Reference Guide
Table 11. Power On Check Bit Fields
Bit Number
0 Not used
1 ROM_ERROR
2 PWM Error
3 NOV_ERROR
4 HDW_ERROR
5 Not used
6 Not used
7 Not used
Last Command Request Status – This field is used to determine whether the last request
was processed successfully. It is also used to track the progress of a multi-stage request,
such as 2 point calibration. The Status Request does not affect the contents of this field,
i.e., successful or unsuccessful processing of a previous status request does not cause the
command status field to be updated.
Table 12. Valid Command Status Field Entries
Response Description
0 Failure in command processing
1 Command being processed
2 Stage 1 processing complete (for multi-stage commands)
3 Command complete
4 Soft Reset Occurred
5 Hard Reset Occurred
6-7 Not used
Get Feature – Get Max Count
This is a request to send information that indicates the maximum number of simultaneous
touches supported by the controller.
Table 13. Get Max Count Setup Stage
Offset Field
0 bmRequestType
1 bRequest
2 wValue
4 wIndex
6 wLength
Description
Size Value
1 0xA1
1 0x01
2 0x0312
2 0
2 2
3M Touch Systems, Inc. Proprietary Information
Notes
Code area checksum error
Touch screen not connected or potential problem.
Parameter Block1 checksum error
Problem with ADCs
Description
Class,D2H,Interface
Get Report
msb=03=Feature
lsb=12 Feature Report ID
Always 0
Always 2
19