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6.3.9.4
Autonomous QTouch Sensor API Flow for UC3L
For the Autonomous QTouch operation, the CAT_CLK must be setup appropriately as a first step.
The Autonomous QTouch and Common configuration parameters in the touch_config_at32uc3l.h
configuration must then be set up.
The touch_at_sensors_init API initializes the QTouch Library as well as the CAT module for the
Autonomous QTouch sensor related pin, register and Global Sensor configuration. The
Autonomous QTouch Sensor can be enabled at any time by the Host Application. Once the
Autonomous QTouch Sensor is enabled, the CAT module performs measurements on this sensor
continuously to detect a Touch Status. When an IN_TOUCH or OUT_OF_TOUCH status is
detected, the QTouch Library calls the touch_at_status_change_interrupt_callback function to
indicate the status to the Host application. It is possible to enable and disable Autonomous
QTouch sensor multiple times in the Host application by using the touch_at_sensor_enable and
touch_at_sensor_disable API.
Using the init_clock() in main.c and clock.c files,
Set the CAT_CLK Clock to appropriate value.
Using the touch_config_at32uc3l.h configuration file,
Set DEF_TOUCH_AUTONOMOUS_QTOUCH = 1.
Set all AT_xx and TOUCH_xx macros to appropriate values.
touch_at_sensor_init()
The callback is called as long
as Autonomous QTouch
sensor is not disabled
Re-enable Autonomous
QTouch Sensor if required
touch_at_sensor_enable()
touch_at_status_change_interrupt_callback(),
Autonomous QTouch Status
Disable Autonomous
QTouch Sensor if required
touch_at_sensor_disable()
Figure 44 Autonomous QTouch API Flow diagram
6.3.9.5
Autonomous QTouch method Enable and Disable Sensor for UC3L
The touch_at_sensor_enable and touch_at_sensor_disable API can be used for Enabling and
Disabling and the Autonomous QTouch Sensor. Once the Autonomous QTouch sensor is
enabled, the CAT module performs continuous Touch Measurements on the Sensor in order to
detect the Touch Status.
131
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