1.6.2 Data Structures

Table 1-8. 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 1-9. 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.