3M Touch Screen USB Resistive Controller SC500 Reference Manual page 28

28
Table 29. Data Stage 1 (controller response header)
Offset Field
0 Report ID
1 Not used
2 bArea
3 Not used
4 bSubArea
5 bIndex
6 bDataLength
7 Not used
Table 30. Data Stage 2 through 9 (controller response data 8 * 8 data bytes)
Offset
0-7
Data Stage
The controller ID is in the first 4 bytes of data stage, the remaining bytes are padding.
Response
If the command cannot be processed, the device stalls endpoint 0. The command
cannot be processed if the memory area is not valid. It cannot be processed if the
request is attempting to access data that is outside the specified memory area. This
may happen if the index is too large or too much data has been requested.
The host can send a status request, as long as the endpoint is not stalled, to determine
if this request was executed properly.
Size Value Description
1 0x05 Feature Report ID
1 0 Not used
1 0 Memory Area (always 0=Ctrl EEPROM )
1 0 Not used
1 0x05 Block number (0x01,0x02, 0x05, or 0x65 for Copyright
string )
1 0x00 Index into block. Use 0 for controller number
1 0x04 Number of valid data bytes for xfer (always padded to 64)
1 0 Not used
Field Size Value
wData 1 0xXX
3M Touch Systems Proprietary Information
SC500 USB Controller Reference Guide
Description
4 bytes of data (trailing pad bytes are ignored )