Atmel QTouch Library User Guide

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Device Specific LibrariesIntroductionThis section provides an overview of the usage of Device specific QTouch Libraries. DeviceSpecific Libraries have been provided for special devices, which are not covered as part ofGeneric Libraries.Devices supportedThe following devices are covered by the Device Specific QTouch Libraries.1. AT32UC3L family devices.2. ATtiny20 and ATtiny40 device.QTouch Library for AT32UC3L devicesATMEL QTouch Library for UC3L can be used for embedding capacitive touch buttons, slidersand wheels functionality into UC3L application. The QTouch Library for UC3L uses the CapacitiveTouch Module (CAT) that senses touch on external capacitive touch sensors.This Section describes the QTouch Library Application Programming Interface (API) for QMatrixand QTouch method acquisition using the AT32UC3L devices.Salient Features of QTouch Library for UC3LQMatrix method sensor• N Touch Channels formed by an X by Y matrix require (X+2Y+1) physical pins (whenusing internal discharge mode), N=X*Y. Please refer Figure 37 for pin requirements indifferent modes.• 1 to 136 Touch Channels can be configured.• Max X Lines = 17, Max Y Lines = 8.• Button is formed using 1 Touch Channel.• Slider is formed using 3 to 8 Touch Channels.• Wheel is formed using 3 to 8 Touch Channels.QTouch method sensor• 2 Physical pins per Touch Channel.• QTouch Sensors can be divided into two groups Group A and Group B.• Each QTouch group can be configured with different properties.• 1 to 17 Touch Channels can be configured.• Button is formed using 1 Touch Channel.• Slider is formed using 3 Touch Channels.• Wheel is formed using 3 Touch Channels.1148207K-AT42-09/11
Autonomous QTouch sensor• A Single QTouch sensor that is capable of detecting touch or proximity without CPUintervention.• Allows proximity or activation detection in low-power sleep modes.Additional Features• Standalone QMatrix, QTouch Group A/B or Autonomous QTouch operation.• Support for operation of two or more methods at the same time.oooScenario 1: QMatrix and Autonomous QTouch method at the same time.Scenario 2: QTouch Group A, QTouch Group B & Autonomous QTouch at thesame time.Scenario 3: QMatrix, QTouch Group A/B and Autonomous QTouch at the sametime.• Disable/Re-enable Sensors at any given time for reduced power consumption.• Raw data acquisition mode without any post-processing of data.• External synchronization to reduce 50 or 60 Hz mains interference.• Spread spectrum sensor drive capability.• QTouch Studio-Touch Analyzer support to fine tune touch implementation.• IAR and GCC Tool chain support.• MISRA Compliant, MISRAC 2004 Rule Set.• Single Library for QMatrix, QTouch Group A/B and Autonomous QTouch methods.Device variants supported for UC3LBelow is the list of different devices in AT32UC3L family that is supported by the QTouch library.1. AT32UC3L0162. AT32UC3L0323. AT32UC3L064Following is the link to AT32UC3L family devices datasheet.http://www.atmel.com/dyn/resources/prod_documents/doc32099.pdfFor capacitive touch sensing module related information Refer to Chapter 28, “Capacitive touchmodule (CAT)” of the datasheet.Compiler tool chain support for UC3LThe QTouch libraries for AT32UC3L devices are supported for the following compiler tool chains.ToolIAR Embedded Workbench for Atmel AVR32.IAR32 Compiler.Version4.1AVR32 Studio. 2.6.0115
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Atmel QTouch LibraryUser GuideSuppo
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5.6.11.6.1 Debug Support in the sam
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6.3.16.21 touch_info_t ............
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• ARM: refers to a device in the
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Libraries for AVR microcontrollers
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QMatrix charge transfer is labeled
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Maximum ON DurationIf an object uni
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Setting Variable name Data Type Uni
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Guard ChannelGuard channel in Qtouc
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7 AKS groups are supported by the l
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Data structuresThis section lists t
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The signal gain for each sensor is
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• This function can be called any
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unit16_t qt_measure_sensors( uint16
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Channel NumberingChannel numbering
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qt_reset_sensing()qt_enable_xxx()qt
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Port AAll SNSK pinsterminatedon thi
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Example:Pins A0 ,A3 and A5 of PORT
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Channel 47 N/A N/A N/A N/A N/A X7Y5
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channel 0channel 1channel 2channel
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Disabling and Enabling of Pull-up f
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‣ Recommended threshold should be
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QMatrix acquisitionmethod libraries
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definition is not required.QT_NUM_C
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SNS1 and SNSK1 pins usethe same por
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• It is recommended to disable PU
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Table 4 :List of configurable param
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Number ofchannels requiredfor the a
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2. The above definitions should be
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Page 74 and 75: Selecting the right configurationTh
Page 76 and 77: Figure 5-20 : Specifying QMatrix ac
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Page 92 and 93: SNSK_array[1][1]=0x00; (SNSK odd ma
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Page 96 and 97: Figure 5-28: New Design Sensors in
Page 98 and 99: Figure 5-31: Selecting the MCU for
Page 100 and 101: Figure 5-34: Selecting the SNS and
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Page 104 and 105: Figure 5-38: Selecting New Design3.
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Page 108 and 109: Figure 5-45: Selecting the X,YA,YB,
Page 110 and 111: The code can be copied using the
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Page 122 and 123: Figure 37 QMatrix method schematicQ
Page 124 and 125: Figure 39 QMatrix API Flow diagram
Page 126 and 127: CAT Module Pin NameCSA0CSB0CSA1CSB1
Page 128 and 129: The QTouch method acquisition using
Page 130 and 131: Host Application codeUsing the init
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Page 134 and 135: Figure 45 Raw acquisition mode API
Page 136 and 137: Figure 46 GNU Example project usage
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Page 152 and 153: variable to the Touch library. The
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touch_qt_get_libinfotouch_ret_t tou
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• This API updates the configurat
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Rule Rule Description Advisory/Requ
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VCCPA0No ConnectionPA1PA2ATtiny20PA
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QTouch Library configuration parame
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Recommended setting.Table 19 QTouch
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Figure 51 Schematic overview of QTo
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QTouch Library configuration parame
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Devices supportedThe list of differ
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• The channel number is derived f
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MISRA Compliance ReportThis section
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May 2010Ver 4.2July 2010Ver 4.3Jan
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Atmel QTouch Library User Guide

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