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6.3.7.6
QMatrix method Disable and Re-enable Sensor for UC3L
The touch_qm_channel_update_burstlen API can be used for Disabling and Re-enabling of
QMatrix Sensors. In order to Disable a sensor, the QMatrix burst length value of all the Touch
Channels corresponding to the Sensor must be set to 1. For Example, when a Wheel or Slider is
composed of 4 Touch Channels, the touch_qm_channel_update_burstlen API should be used to
set the burst length of all the 4 Touch Channels to 1. For the case of a Button,
touch_qm_channel_update_burstlen API should be used to set burst length of the corresponding
single Touch Channel of the Button to 1. Similarly, when re-enabling a Sensor, appropriate burst
length must be set to all the Touch channels corresponding to the Sensor.
When a QMatrix Sensor is Disabled or re-enabled, it is mandatory to force Calibration on all
Sensors. The Calibration of all Sensors is done using the touch_qm_sensors_calibrate API.
Note: When disabling a Wheel or Slider, care must be taken to set the burst length of all the
Touch channels corresponding to the Wheel or Slider to 1. If any of the Touch channels are
missed out, it may result in undesired behavior of the Wheel or Slider. Similarly when re-enabling
a Wheel or Slider, burst length of all the Touch channels corresponding to the Wheel or Slider
must be set to an appropriate value. If any of the Touch Channels are left disabled with a burst
length value 1, it may result in undesired behavior of Wheel or Slider.
6.3.8 QTouch Group A/B method sensor operation for UC3L
6.3.8.1
QTouch Group A/B method pin selection for UC3L
Please refer AT32UC3L datasheet Table 28-2 Pin Selection Guide and Table 3-1 GPIO
Controller Function multiplexing, for mapping between the QTouch method pin name
(SNS/SNSK) and the GPIO pin. The CAT module provides an option to enable a nominal output
resistance of 1kOhm on specific CAT module pins during the burst phase. The Table below
captures the different QTouch method pin wherein a Resistive Drive can be optionally enabled.
The rows marked with Grey indicate that Resistive Drive option is not available on that pin. By
carefully choosing the QTouch method SNSK pins wherein Resistive Drive can be enabled,
saving on external components is possible. Section 6.3.1.2 provides detail on the number of Pin
and Touch channels required for different QTouch method sensor. Also, Section 6.3.11 indicates
the various Pin Configuration options for the QTouch Library that can be used to specify a user
defined configuration.
124
8207L-AT42-05/12
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