Atmel QTouch Library User Guide

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has Four Comparators (AC0A , AC1A , AC0B , AC1B), So there are 10 Possible Yb lines asgiven in table below.User has flexibility to configure maximum 8 Yb lines for maximum 64 channel libraries.Belowtable states the Yblines which can be configuredYb LInes of the FourAnalog ComparatorsAC0AN0(AC0A Comparator)AC0AN1(AC0A Comparator)AC0BP0(AC0A Comparator)AC1AN0(AC1A Comparator)AC1AN1(AC1A Comparator)AC1BP0(AC1A Comparator)AC0BN0(AC0B Comparator)AC0BN1(AC0B Comparator)AC1BN0(AC1B Comparator)AC1BN1(AC1B Comparator)Port APinsPA22PA27PA23PA13PA07PA14PA21PA29PA15PA09These Yb lines are the negative input pins of the analog comparator.To use the library, the belowtable shows the lines which are externally grounded for Proper Qmatrix operationPositive Input Pins of the FourAnalog ComparatorsAC0AP0(AC0A Comparator)AC0BP1(AC0B Comparator)AC1AP0(AC1A Comparator)AC1BP1(AC1B Comparator)Port APinsPA20PA28PA12PA08If only one comparator is used , then the corresponding pin of that comparator is properlyexternally grounded.Above table shows the Analog comparator usage and the correspondinglines which needs to be grounded.The Port pin configurability is provided in the library to select any port for Ya or X lines.ThePort for Yb lines is fixed which is PORTA as these lines are inputs of the Analog comparatorswhich are fixed pins of PORTA.X,YA,YB,SMPConfigurationsPorts on UC3CPORTA PORTB PORTC PORTDX Yes Yes Yes YesYA Yes Yes Yes YesYBYes(only fewpins of PortANo No No668207K-AT42-09/11
can beconfigured asYb Lines)SMP Yes Yes Yes YesThe configurability is provided to select X,SMP and YA lines on Same Port ,X,SMP andYB lines on same port.Number of X ports should be 1 means the X lines should be connected to a single port.Note: YA and YB cannot be on the same port.SMP Pin should be less than equal to 19 th pin of any Port.Checklist of items for integrating QMatrix Capacitive sensing librariesWhen integrating QMatrix acquisition method libraries, ensure the following• Check that the CLKPR register is available for the selected device. If not remove theCLKPR statements.• Ensure that the configuration for the QMatrix is done in touch_qm_config.h and thearrays of the x_line_info and y_line info are filled as indicated section 5.8.2• MCUCR register is available and if so disable pullups• Check if the timer registers and bit fields used are correct and change them if necessary.• The above settings can be modified by the user by changing the API’s that are availableto the user. The API’s includeo qt_set_parameters ( )• The host application must provide the current time.This information is passed to the library as an argument to the functionqt_measure_sensors()”. This is used for time-based library operations such as driftcompensation.• The GPIO internal pull-ups must be disabled for all port pins used for touch sensing whencalling the library.For 8-bit AVR devices, this can be done byb. Setting the “PUD” bit in the “MCUCR” register orc. Setting the “PUD” bit in the “SFIOR” register.• Setting the JTD bit in the “MCUCR” register to disable JTAG Interface in MCU ( ifavailable ). This can be done only when the JTAG lines are in conflict with the desiredtouch sensing lines.• The library must be called often enough to provide a reasonable response time to usertouches. The typical time to call the library is from 25 ms to 50 ms.• Care should be taken while using the ADC conversion logic and QMatrix library such thatthe host application waits for approximately 1msec before actually calling theqt_measure_sensors() API depending upon the ADC clock.Common checklist itemsConfiguring the stack size for the applicationThe stack requirements for the QTouch library should be accounted for and the stack sizeadjusted in the user’s project for proper operation of the software when using the IAR IDE. Thissection lists the stack usage for the different variants of the QTouch and QMatrix acquisitionmethod libraries applicable to the IAR compiler tool chain.67
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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
Page 16 and 17: QMatrix charge transfer is labeled
Page 18 and 19: Maximum ON DurationIf an object uni
Page 20 and 21: Setting Variable name Data Type Uni
Page 22 and 23: Guard ChannelGuard channel in Qtouc
Page 24 and 25: 7 AKS groups are supported by the l
Page 26 and 27: Data structuresThis section lists t
Page 28 and 29: The signal gain for each sensor is
Page 30 and 31: • This function can be called any
Page 32 and 33: unit16_t qt_measure_sensors( uint16
Page 34 and 35: Channel NumberingChannel numbering
Page 36 and 37: qt_reset_sensing()qt_enable_xxx()qt
Page 38 and 39: Port AAll SNSK pinsterminatedon thi
Page 40 and 41: Example:Pins A0 ,A3 and A5 of PORT
Page 42 and 43: Channel 47 N/A N/A N/A N/A N/A X7Y5
Page 44 and 45: channel 0channel 1channel 2channel
Page 46 and 47: Disabling and Enabling of Pull-up f
Page 48 and 49: ‣ Recommended threshold should be
Page 50 and 51: QMatrix acquisitionmethod libraries
Page 52 and 53: definition is not required.QT_NUM_C
Page 54 and 55: SNS1 and SNSK1 pins usethe same por
Page 56 and 57: • It is recommended to disable PU
Page 58 and 59: Table 4 :List of configurable param
Page 60 and 61: Number ofchannels requiredfor the a
Page 62 and 63: 2. The above definitions should be
Page 64 and 65: NUM_Y_LINES_ROTOR_SLIDER_QT_MAX_NUM
Page 68 and 69: Note: When using the IAR IDE / comp
Page 70 and 71: Figure 5-11: Selecting the right co
Page 72 and 73: SNS1 - SNSK1 & SNS2 -SNSK2QT_NUM_CH
Page 74 and 75: Selecting the right configurationTh
Page 76 and 77: Figure 5-20 : Specifying QMatrix ac
Page 78 and 79: Debug Support in Example applicatio
Page 80 and 81: Support for different compiler tool
Page 82 and 83: Maximum number of rotor / sliders s
Page 84 and 85: Tips on pin assignments for the sen
Page 86 and 87: ATtiny88)v1g1s2(ATtiny461,ATmega16a
Page 88 and 89: X0,X1,X2,X3 are on PB0,PB1,PB2,PB3N
Page 90 and 91: 1. The channel numbers are allocate
Page 92 and 93: SNSK_array[1][1]=0x00; (SNSK odd ma
Page 94 and 95: SNSK_array[1][0]=0x14; (SNSK even m
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
Page 102 and 103: 2. QTOUCH_STUDIO_MASKS needs to be
Page 104 and 105: Figure 5-38: Selecting New Design3.
Page 106 and 107: Figure 5-42: Start window of the co
Page 108 and 109: Figure 5-45: Selecting the X,YA,YB,
Page 110 and 111: The code can be copied using the
Page 112 and 113: ApplicablereleaseQTouch libraries v
Page 114 and 115: 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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Frozen Stop Stop Run Run Run Run On
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Figure 45 Raw acquisition mode API
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Figure 46 GNU Example project usage
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the QTouch Library as QMatrix data
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TOUCH_STATUS_CHANGE 0x0002u Status
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sensor_type_tEnumerationUsesensor_t
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OUT_OF_TOUCHIN_TOUCHCurrently the a
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num_channel_signals uint8_t Length
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touch_at_statusstructureInput / Out
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UseData structure which holds the R
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variable to the Touch library. The
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structure.p_qta_config touch_qt_con
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p_touch_sensor_param touch_qm_param
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current_time_ms touch_time_t Curren
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touch_ret_t touch_qt_sensor_config(
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touch_qt_sensors_calibratetouch_ret
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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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