Atmel QTouch Library User Guide

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Recommended setting.Table 19 QTouch Library for ATtiny20 Memory requirementsData memory for ATtiny20 QTouch Library include the following.10. QTouch Library data memory – 19 bytes, allocated inside the Library.11. channel_signals – 2 bytes per Sensor, allocated in main.c12. channel_references – 2 bytes per Sensor, allocated in main.c13. sensor_delta – 2 bytes per Sensor, allocated in main.c14. sensor_general_counter – 2 bytes per Sensor, allocated in main.c15. sensor_state – 1 byte per Sensor, allocated in main.c16. sensor_ndil_counter – 1 byte per Sensor, allocated in main.c17. sensor_states – 1 byte, allocated in main.cConst Data memory for ATtiny20 QTouch Library include the following.1. sensor_threshold, 1 byte per Sensor, allocated in main.c2. sensor_hyst_threshold, 1 byte per Sensor, allocated in main.c3. sensor_recal_threshold, 1 byte per Sensor, allocated in main.cQTouch Library for ATtiny40 deviceATMEL QTouch Library for ATtiny40 can be used for embedding capacitive touch buttonsfunctionality into ATtiny40 device application.This Section describes the QTouch Library Application Programming API and Configurationinterface for QTouch method acquisition using the ATtiny40 devices.Salient Features of QTouch Library for ATtiny40QTouch method sensor• One Physical pin per Touch Button.• 1 to 12 Touch Buttons can be configured.• Individual Sensor Threshold, Sensor Hysteresis and Sensor Global acquisitionparameters can be configured.• Signal resolution can be configured.• Charge Share Delay can be configured.• Adjacent Key Supression (AKS) support.• QTouch Studio support for Touch data analysis.• ‘C’ Programming interface for easy inclusion of User application.1748207K-AT42-09/11
Compiler tool chain support for ATtiny40The QTouch libraries for ATtiny40 devices are supported for the following compiler tool chains.ToolIAR Embedded Workbench for Atmel AVR.IAR Compiler.Version5.51Table 20 Compiler tool chains support for ATtiny40 QTouch LibraryOverview of QTouch Library for ATtiny40For an overview of QTouch method based capacitive touch acquisition, refer Section 5.2.1QTouch Acquistion method.The QTouch Library for ATtiny40 device allows for Sensor configuration and Sensor Acquisitionparameter setting. Based on the input Sensor configuration, the QTouch Library takes care of thecapacitive touch acquisition data capture operations on the external capacitive touch sensors.The captured Touch Data and Touch Button ON/OFF Status information is then available for userapplication.The diagram below indicates a Typical Sensor arrangement using the Tiny40 device. For onechannel configuration, two ADC pins are used for acquisition. For number of touch buttonsgreater than one, no extra ADC pins are used. Port pins PA0 to PA7 and PB0 to PB3 can beused to support upto 12 Touch Buttons. The Touch Buttons may be connected anywhere on thesaid port pins.The Sensor numbering is always in the increasing order of Port pin.VCCGNDATtiny40PA0PA1PA2PA3PA4PA5PA6PA7PB0PB1PB2PB31Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1KohmTouch Button 0Touch Button 1Touch Button 2Touch Button 3Touch Button 4Touch Button 5Touch Button 6Touch Button 7Touch Button 8Touch Button 9Touch Button 10Touch Button 11175
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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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NUM_Y_LINES_ROTOR_SLIDER_QT_MAX_NUM
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has Four Comparators (AC0A , AC1A ,
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Note: When using the IAR IDE / comp
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Figure 5-11: Selecting the right co
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SNS1 - SNSK1 & SNS2 -SNSK2QT_NUM_CH
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Selecting the right configurationTh
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Figure 5-20 : Specifying QMatrix ac
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Debug Support in Example applicatio
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Support for different compiler tool
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Maximum number of rotor / sliders s
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Tips on pin assignments for the sen
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ATtiny88)v1g1s2(ATtiny461,ATmega16a
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X0,X1,X2,X3 are on PB0,PB1,PB2,PB3N
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1. The channel numbers are allocate
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SNSK_array[1][1]=0x00; (SNSK odd ma
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SNSK_array[1][0]=0x14; (SNSK even m
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Figure 5-28: New Design Sensors in
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Figure 5-31: Selecting the MCU for
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Figure 5-34: Selecting the SNS and
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2. QTOUCH_STUDIO_MASKS needs to be
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Figure 5-38: Selecting New Design3.
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Figure 5-42: Start window of the co
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Figure 5-45: Selecting the X,YA,YB,
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The code can be copied using the
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ApplicablereleaseQTouch libraries v
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Device Specific LibrariesIntroducti
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Table 8 Compiler tool chains suppor
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maintains the States of QMatrix, QT
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equired as shown in the case A of F
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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
Page 132 and 133: Frozen Stop Stop Run Run Run Run On
Page 134 and 135: Figure 45 Raw acquisition mode API
Page 136 and 137: Figure 46 GNU Example project usage
Page 138 and 139: the QTouch Library as QMatrix data
Page 140 and 141: TOUCH_STATUS_CHANGE 0x0002u Status
Page 142 and 143: sensor_type_tEnumerationUsesensor_t
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Page 146 and 147: num_channel_signals uint8_t Length
Page 148 and 149: touch_at_statusstructureInput / Out
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Page 152 and 153: variable to the Touch library. The
Page 154 and 155: structure.p_qta_config touch_qt_con
Page 156 and 157: p_touch_sensor_param touch_qm_param
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Page 160 and 161: touch_ret_t touch_qt_sensor_config(
Page 162 and 163: touch_qt_sensors_calibratetouch_ret
Page 164 and 165: touch_qt_get_libinfotouch_ret_t tou
Page 166 and 167: • This API updates the configurat
Page 168 and 169: Rule Rule Description Advisory/Requ
Page 170 and 171: VCCPA0No ConnectionPA1PA2ATtiny20PA
Page 172 and 173: QTouch Library configuration parame
Page 176 and 177: Figure 51 Schematic overview of QTo
Page 178 and 179: QTouch Library configuration parame
Page 180 and 181: Devices supportedThe list of differ
Page 182 and 183: • The channel number is derived f
Page 184 and 185: MISRA Compliance ReportThis section
Page 186 and 187: May 2010Ver 4.2July 2010Ver 4.3Jan
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