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The Above figure illustrates how a Guard sensor/key is to be visualized.It has six keys and five
keys are surrounded by a Guard Channel.
Please refer QTAN0031 for further information on Guard Channel.
http://www.atmel.com/dyn/resources/prod_documents/QTAN0031(2).pdf
5.6 QTouch API and Usage
The Atmel QTouch library provides support for many devices. This chapter explains the touch
library for such devices without any hardware support.
5.6.1 QTouch Library API
This section describes the QTouch library Application Programming Interface (API) for touch
sensing using QTouch and QMatrix acquisition methods.
Using the API, Touch sensors and the associated channels can be defined. Once touch sensing
has been initiated by the user, the host application can use the API to make touch measurements
and determine the status of the sensors.
5.6.2 touch_api.h - public header file
The touch_api.h header file is the public header file which needs to be included in users
application and it has the type definitions and function prototypes of the API’s listed in sections
5.6.3 , 5.6.4 and 5.6.5
The touch_api.h header file is located in the library distribution in the following directory.
?
..\Atmel_QTouch_Libraries_5.x\Generic_QTouch_Libraries\include
5.6.3 Type Definitions and enumerations used in the library
5.6.3.1
Typedefs
This section lists the type definitions used in the library.
Typedef
uint8_t
int8_t
uint16_t
int16_t
uint32_t
threshold_t
Notes
unsigned 8-bit integer
signed 8-bit integer
unsigned 16-bit integer
signed 16-bit integer
unsigned 32-bit integer
unsigned 8-bit integer
used for setting a sensor detection threshold
5.6.3.2
Enumerations
This section lists the enumerations used in the QTouch Library.
5.6.3.2.1
Enumeration
Use
Values
sensor_type_t
sensor_type_t
Define the type of the sensor
Comment
SENSOR_TYPE_UNASSIGNED
SENSOR_TYPE_KEY
SENSOR_TYPE_ROTOR
22
Channel is not assigned to any sensor
Sensor is of type KEY
Sensor is of type ROTOR
8207L-AT42-05/12
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