Atmel QTouch Library User Guide

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• The channel number is derived from the position of the pins used for SNS and SNSKlines for any channel.ochannel number = floor( [SNS(or SNSK) pin number] / 2 )For e.g., pins 4 and 5 are connected to a SNS/SNSK pair and the channel numberassociated with the SNS/SNSK pin is 2.Rules For Configuring SNS and SNSK masks for 2K DevicesThe libraries internally need SNS_array and SNSK_array masks. These masks need to bedefined under Macro QTOUCH_STUDIO_MASKS as per the following rules given below:1. In case of Interport, SNS_array[0] and SNSK_array[0] mask is used for configuring theChannel0 and Channel2.And SNS_array[1] and SNSK_array[1] mask is used for configuring theChannel1 and Channel3.And In case of Intraport SNS_array[0] and SNSK-array[0] are used forall the four channels configured based on enabled bits in SNS_array[0] and SNSK-array[0].2. The channel numbers are allocated based on enabled SNS pins starting from LSBBit.In case of Interport, Keys on adjacent channels should be placed on different masks. Channel0and Channel1 should be on different SNS/SNSK masks ie channel0 onSNS_array[0]/SNSK_array[0] and channel1 on SNS_array[1]/ SNSK_array[1].But in case of Intraport, Keys on adjacent channels should be placed on same masks. Channel0and Channel2 should be on same mask ie SNS_array[0]/SNSK_array[0] and Channel1 andChannel3 on SNS_array[1]/ SNSK_array[1].Configuring SNS and SNSK masks in case of Interport:1. Enable the Bit0 in SNS_array[0] and Bit0 in SNSK_array[0] mask when enabling Channel0.2. Enable the Bit1 in SNS_array[1] and Bit1 in SNSK_array[1] mask when enabling Channel1.3. Enable the Bit2 in SNS_array[0] and Bit2 in SNSK_array[0] mask when enabling Channel2.4. Enable the Bit3 in SNS_array[1] and Bit3 in SNSK_array[1] mask when enabling Channel3.Example 1:In a 4 channel library, two keys on channel 0 and 3 are enabled.SNS on Port A and SNSK onPort B .Channel0 will A0B0 and Channel3 will be A3B3.The SNS and SNSK masks will beSNS_array[0]=0x01;SNS_array[1]=0x08;SNSK_array[0]=0x01;SNSK_array[1]=0x08;Configuring SNS and SNSK masks in case of Intraport:1. Enable the Bit0 in SNS_array[0] and Bit1 in SNSK_array[0] mask when enabling Channel0.2. Enable the Bit2 in SNS_array[0] and Bit3 in SNSK_array[0] mask when enabling Channel1.3. Enable the Bit4 in SNS_array[0] and Bit5 in SNSK_array[0] mask when enabling Channel2.4. Enable the Bit6 in SNS_array[0] and Bit7 in SNSK_array[0] mask when enabling Channel3.Example 1:1828207K-AT42-09/11
In a 4 channel library, two keys on channel 0 and 3 are enabled.SNS and SNSK on Port B.Channel0 will B0B1 and Channel3 will be B6B7.The SNS and SNSK masks will beSNS_array[0]=0x41;SNS_array[1]=0x00;SNSK_array[0]=0x82;SNSK_array[1]=0x00;Integrating QTouch libraries for 2K Devices in your applicationIn order to Integrate QTouch libraries for 2K devices, the constants and symbol names listed inTable 1 below need to be defined in the user application. These can be defined in either thecompiler/assembler preprocessing definitions or in the touch_t_config_2kdegice.h file. Exampleprojects are provided for all the four devices supported.Refer 5.6.10.1 for directory structure of allthe files.Table 1: Constant and symbol name definitions required to use the QTouchacquisition method libraries for 2K device librariesSymbol / Constant name Range of values Comments_QTOUCH_This macro has to be defined in order touse QTouch libraries.SNS & SNSKRefer to library selection guide._SNS_SNSK_SAME_PORT_ Comment/uncomment define To be enabled if thesame port is used forSNSK and SNS pinsfor QTouch. If SNSKand SNS pins are ondifferent ports thenthis definition is notrequired.QT_NUM_CHANNELS1, 2 and 4 for 2K device libraries.QT_DELAY_CYCLES 1 to 255 Please refer to section5.6.8.QTOUCH_STUDIO_MASKSThis macro has to be defined in order touse QTouch libraries for 2K devices.SNS_array andSNSK_array masksvariablesare initializedunder this Macro inmain file.Refer section7.5.2.2The following files are to be added along with the touch library and user applicationbefore compilation:• For ATtiny 2K devices - touch_api_2kdevice.h, touch_qt_config_2kdevice.h andqt_asm_tiny_mega_2kdevice.S183
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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
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Figure 39 QMatrix API Flow diagram
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CAT Module Pin NameCSA0CSB0CSA1CSB1
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The QTouch method acquisition using
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Host Application codeUsing the init
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Page 152 and 153: variable to the Touch library. The
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Page 172 and 173: QTouch Library configuration parame
Page 174 and 175: Recommended setting.Table 19 QTouch
Page 176 and 177: Figure 51 Schematic overview of QTo
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Page 180 and 181: Devices supportedThe list of differ
Page 184 and 185: MISRA Compliance ReportThis section
Page 186 and 187: May 2010Ver 4.2July 2010Ver 4.3Jan
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Atmel QTouch Library User Guide

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