Atmel QTouch Library User Guide

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Channel 47 N/A N/A N/A N/A N/A X7Y5 X7Y5Channel 48 N/A N/A N/A N/A N/A X0Y6 X0Y6Channel 49 N/A N/A N/A N/A N/A X1Y6 X1Y6Channel 50 N/A N/A N/A N/A N/A X2Y6 X2Y6Channel 51 N/A N/A N/A N/A N/A X3Y6 X3Y6Channel 52 N/A N/A N/A N/A N/A X4Y6 X4Y6Channel 53 N/A N/A N/A N/A N/A X5Y6 X5Y6Channel 54 N/A N/A N/A N/A N/A X6Y6 X6Y6Channel 55 N/A N/A N/A N/A N/A X7Y6 X7Y6Channel 56 N/A N/A N/A N/A N/A N/A X0Y7Channel 57 N/A N/A N/A N/A N/A N/A X1Y7Channel 58 N/A N/A N/A N/A N/A N/A X2Y7Channel 59 N/A N/A N/A N/A N/A N/A X3Y7Channel 60 N/A N/A N/A N/A N/A N/A X4Y7Channel 61 N/A N/A N/A N/A N/A N/A X5Y7Channel 62 N/A N/A N/A N/A N/A N/A X6Y7Channel 63 N/A N/A N/A N/A N/A N/A X7Y7Sensor NumberingThe ordering and numbering of sensors is related to the order in which the sensors are enabled.This is independent of the acquisition method (QMatrix or QTouch acquisition method libraries).For example, consider this code snippet:…./* enable slider */qt_enable_slider (CHANNEL_0, CHANNEL_2, AKS_GROUP_1, 16,HYST_6_25, RES_8_BIT, 0);/* enable rotor */qt_enable_rotor (CHANNEL_3, CHANNEL_5, AKS_GROUP_1, 16, HYST_6_25,RES_8_BIT, 0);/* enable keys */qt_enable_key (CHANNEL_6, AKS_GROUP_2, 10, HYST_6_25);qt_enable_key (CHANNEL_7, AKS_GROUP_2, 10, HYST_6_25);In the case above, the slider on channels 0 to 2 will be sensor 0, the rotor on channels 3-to-5 issensor 1 and the keys on channels 6 and 7 are sensor numbers 3 and 4 respectively.When the touch status is reported or queried, the corresponding sensor positions and statusindicate the touch status. For example, the slider is in detect if “qt_measure_data.qt_touch_status.sensor_states” bit position 0 is set. Similarly, the rotor on channels 3 to 5 issensor 1, and the keys on channels 6 and 7 are sensors 2 and 3 respectively.However, the code could be re-arranged as follows to give a different sensor numbering./* enable rotor */qt_enable_rotor (CHANNEL_3, CHANNEL_5, NO_AKS_GROUP, 16,HYST_6_25, RES_8_BIT, 0);/* enable keys */qt_enable_key (CHANNEL_6, AKS_GROUP_2, 10, HYST_6_25);qt_enable_key (CHANNEL_7, AKS_GROUP_2, 10, HYST_6_25);/* enable slider */428207K-AT42-09/11
qt_enable_slider (CHANNEL_0, CHANNEL_2, NO_AKS_GROUP, 16,HYST_6_25, RES_8_BIT, 0);Now, the rotor is sensor 0, the keys are sensors 1 and 2, and the slider is sensor 3.So, the order in which the user enables the sensors is the order in which the sensors arenumbered. Depending on the user requirements, the sensors can be configured in the preferredorder.NOTE: In case of QMatrix, the channels on the Unused X lines (or) unused Y lines should beignored and not to be used as arguments in this API.Ex: If the host application needs only 24 channels , there are two possible options.1. In 32 (8x4 configuration), if X6 and X7 are unused, channel6, channel7,channel14, channel15, channel 22, channel23, channel30, channel 31cannot be used2. In 32 (8x4 configuration), if Y3 is unused, channe24, channel25,channel26, channel27, channel 28, channel29, channel30, channel 31cannot be usedFiltering Signal MeasurementsThe ATMEL QTouch Library API provides a function pointer called “qt_filter_callback”. The usercan use this hook to apply filter functions to the measured signal values.If the pointer is non-NULL, the library calls the function after library has made capacitive channelmeasurements, but before the library has processed the channel information and determining thesensor states.43
Page 1: Atmel QTouch LibraryUser GuideSuppo
Page 4: 5.6.11.6.1 Debug Support in the sam
Page 7 and 8: 6.3.16.21 touch_info_t ............
Page 12 and 13: • ARM: refers to a device in the
Page 14 and 15: 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 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 66 and 67: has Four Comparators (AC0A , AC1A ,
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
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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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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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