1.5.3 Status and Output Data

Table 1-7. Group Data
Parameter	Size	Range/Options	Usage
qtm_keys_status	1 byte	Bit 7: Reburst required Bit 6-1: Reserved Bit 0: Touch Detection	Indicates the current state of the Touch Key Group
acq_group_timestamp	2 bytes	0-to-65535	Timestamp of last drift period processed
dht_count_in	1 byte	0-to-‘`sensor_drift_hold_time`’	Countdown to drift hold release after a touch event
tch_drift_count_in	1 byte	0-to-‘`sensor_touch_drift_rate`’	Countdown to next towards a touch drift period
antitch_drift_count_in	1 byte	0-to-‘`sensor_anti_touch_drift_rate`’	Countdown to the next away from a touch drift period

Individual Key Sensor Data

The individual key sensor data is required by other post processing modules like Scroller. So, this data structure definition is placed on the common_compoenents_api.h file.


Parameter	Size	Range/Options	Usage
sensor_state	1 byte	Bit field	Touch key sensor state
sensor_state_counter	1 byte	0-to-255	The number of repeat measurements to confirm a touch detection and an out-of-touch detection
*node_data_struct_ptr	2/4 bytes	Pointer	Pointer to node data structure array
Channel_reference	2 bytes	0-to-65535	Reference measurement, baseline for touch detection


sensor_state	Value
`QTM_KEY_STATE_DISABLE`	0x00
`QTM_KEY_STATE_INIT`	0x01
`QTM_KEY_STATE_CAL`	0x02
`QTM_KEY_STATE_NO_DET`	0x03
`QTM_KEY_STATE_FILT_IN`	0x04
`QTM_KEY_STATE_DETECT`	0x85
`QTM_KEY_STATE_FILT_OUT`	0x86
`QTM_KEY_STATE_ANTI_TCH`	0x07
`QTM_KEY_STATE_SUSPEND`	0x08
`QTM_KEY_STATE_CAL_ERR`	0x09

Note: Bit 7 (0x80u) is set in each state where the touch key sensor is ‘In Detect’.