3.1.6.2 Data Structures

Table 3-12. Group Configuration
Parameter	Size	Range/Options	Usage
`*qtm_touch_key_data`	Pointer 2/4 bytes	`qtm_touch_key_data_t`	Pointer to touch key data for the underlying set of touch keys
`num_scrollers`	1 byte	1-to-255*	The number of scrollers implemented in this group

Table 3-13. Individual Sensor Configuration
Parameter	Size	Range/Options	Usage
`type`	1 byte	0 = Linear Slider 1 = Wheel	Type of scroller
`start_key`	2 bytes	0-to-65535*	The key number which forms the first component key of the scroller
`number_of_keys`	1 byte	2-to-255	The number of component keys to form the scroller. The minimum number of keys required to make a slider is two and the minimum number of keys to make a wheel is three.
`resol_deadband`	1 byte	Bits 7:4 = Resolution 2 to 12 bits	Full scale position resolution reported for the scroller
`resol_deadband`	1 byte	Bits 3:0 = Dead band 0% to 15% (each side)	The size of the edge correction dead bands as a percentage of the full scale range
`position_hysteresis`	1 byte	0-to-255	The minimum travel distance to be reported after contact or direction change
`contact_min_threshold`	2 bytes	0-to-65535	The minimum contact size measurement for persistent contact tracking. The contact size is the sum of two neighboring keys’ touch deltas forming the touch contact.