3M Touch Screen Controller RX181, Reference Manual

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3M™ MicroTouch™ Controller RX181 Reference Guide 27
3M Touch Systems, Inc. Proprietary Information
The host can send a status request, as long as the endpoint is not stalled, to determine if
this request was executed properly.
Get Feature – Get Controller Number
This command is used to get a controller number for application use. The controller does
not use this value. This process is useful for identifying individual controllers in a
multiple controller system.
Due to HID functionality, retrieving data from the controller involves two steps.
1. Requesting the controller number parameter
2. Retrieving the controller number value
Table 26. Get Controller Number Parameter Request
Offset Field Size Value Description
0 bmRequestType 1 0x21 Device to host
1 bRequest 1 0x09 Set Report
2 wValue 2 0x0303 03 = Feature
03 = Feature Report ID
4 wIndex 2 0 Always 0
6 wLength 2 0 Always 8
Table 27. Data Stage
Offset Field Size Value Description
0 bReport ID 1 0x03 Feature Report ID
1 bmReport
Subtype
1 0x02 Indicates a set param index
2 bArea 1 0 Memory Area (always 0=Ctrl
EEPROM )
3 Not used 1 0 Not used
4 bSubArea 1 0x05 Block number
5 bIndex 1 0x00 Index into block.
6 bDataLength 1 0x04 Number of valid data bytes for
xfer (always padded to 64)
7 Not used 1 0 Not used
Table 28. Get Controller Number Report
Offset Field Size Value Description
0 bmRequestType 1 0xA1 Device to host
1 bRequest 1 0x01 Get Report
2 wValue 2 0x0305 03 = Feature
05 = Feature Report ID
4 wIndex 2 0 Always 0
6 wLength 2 0x48 Always 72 (allows for 64 data
bytes + 8 byte header)