The Table below describes the various configuration parameters corresponding to the ATtiny20.
|
Parameter |
Description |
|---|---|
|
DEF_QT_QDEBUG_ENABLE |
Enable/Disable QDebug debug data communication to QTouch Studio. |
|
DEF_QT_NUM_SENSORS |
QTouch number of Sensors. Range: 1u to 5u. |
|
DEF_QT_SENSOR_0_THRESHOLD, DEF_QT_SENSOR_1_THRESHOLD, DEF_QT_SENSOR_2_THRESHOLD, DEF_QT_SENSOR_3_THRESHOLD, DEF_QT_SENSOR_4_THRESHOLD |
Sensor detection threshold value. Range: 1u to 255u |
|
DEF_QT_SENSOR_0_HYSTERESIS, DEF_QT_SENSOR_1_HYSTERESIS, DEF_QT_SENSOR_2_HYSTERESIS, DEF_QT_SENSOR_3_HYSTERESIS, DEF_QT_SENSOR_4_HYSTERESIS |
Sensor detection hysteresis value. Refer hysteresis_t in touch_api_tiny20.h HYST_50 = (50% of Sensor detection threshold value) HYST_25 = (25% of Sensor detection threshold value) HYST_12_5 = (12.5% of Sensor detection threshold value) HYST_6_25 = (6.25%, but value is hardlimited to 2) |
|
DEF_QT_SENSOR_0_RECAL_THRESHOLD, DEF_QT_SENSOR_1_RECAL_THRESHOLD, DEF_QT_SENSOR_2_RECAL_THRESHOLD, DEF_QT_SENSOR_3_RECAL_THRESHOLD, DEF_QT_SENSOR_4_RECAL_THRESHOLD |
Sensor recalibration threshold value. Refer recal_threshold_t in touch_api_tiny20.h RECAL_100 = (100% of Sensor detection threshold value) RECAL_50 = (50% of Sensor detection threshold value) RECAL_25 = (25% of Sensor detection threshold value) RECAL_12_5 = (12.5% of Sensor detection threshold value) RECAL_6_25 = (6.25%, but value is hardlimited to 4) |
|
DEF_QT_DELAY_CYCLES |
Delay cycles that determine the capacitance charge transfer time. Range: 1, 2, 4, 8 or 10 internal System Clock cycles. |
|
DEF_QT_ADC_CHANNEL_START_INDEX |
ADC Channel starting index. Range: 1u to 7u |
|
DEF_QT_AKS_ENABLE |
Enable/Disable Adjacent Key suppression (AKS) on all channels. |
|
DEF_QT_DI |
Sensor detect integration (DI) limit.Range: 0u to 255u. Refer Section 5.3 and Section 5.4 for more info. |
|
DEF_QT_NEG_DRIFT_RATE*(See Note 1) |
Sensor negative drift rate. Units: 100ms, Range: 1u to 127u. Refer Section 5.3 and Section 5.4 for more info. |
|
DEF_QT_POS_DRIFT_RATE*(See Note 1) |
Sensor positive drift rate. Units: 100ms, Range: 1u to 127u. Refer Section 5.3 and Section 5.4 for more info. |
|
DEF_QT_MAX_ON_DURATION |
Sensor maximum on duration. Units: 100ms, Range: 0u to 255u. Refer Section 5.3 and Section 5.4 for more info. |
|
DEF_QT_DRIFT_HOLD_TIME |
Sensor drift hold time. Units: 100ms, Range: 1u to 255u. Refer Section 5.3 and Section 5.4 for more info. |
|
DEF_QT_POS_RECAL_DELAY |
Positive Recalibration delay. Range: 1u to 255u. Refer Section 5.3 and Section 5.4 for more info. |
|
DEF_QT_NUM_SENSORS_SYM |
QTouch number of Sensors Symbol for QTouch Library. MUST be the same as DEF_QT_NUM_SENSORS. |
|
DEF_QT_BURST_LENGTH |
Specifies the no:of burst sequence required for a sensor. Multiple burst for adjusting sensitivity by increasing the resolution of the Signal measured.Use higher value for increasing sensitivity. Values: 1u, 4u and 16u |
|
DEF_CHARGE_SHARE_DELAY |
Defines the Charging Share Delay time as an additional Number of CPU Cycles delay to be introduced during the Charge transfer. Values:0 to 255 . |
Note1:
For the case of ATtiny20 devices, a ‘touch’ causes the Signal value measured on the Sensor to increase above the Sensor Reference value (In the case of Generic Library devices, a ‘touch’ causes the Signal value to decrease below the Reference value).
However, the Negative drift rate and Positive drift rate functionality for the case of Tiny20 devices shall be consistent with the Generic Library case.
So, it is recommended to have a ‘Slower’ Negative Drift rate (4 seconds is the default setting) and a ‘Faster’ Positive Drift rate (1 second is the default setting) for the Tiny20 device.