Atmel QTouch Library User Guide

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Data structuresThis section lists the data structures that hold sensor status, settings, and diagnostics informationqt_touch_status_tStructure qt_touch_status_tInput / Output Output from the LibraryUseHolds the status ( On/ Off ) of the sensors and the linear and angular positionsof sliders and rotors respectivelyFieldsCommentsensor_states[] For Sensor, the sensor_states. Bit “n” = state of nth sensor :Bit Value 0 - indicates the sensor is not in detectBit Value 1 - indicates the sensor is in detectrotor_slider_values[]Rotors angles or slider positions if rotors and sliders are used. Thesevalues are valid when sensor states shows that the corresponding rotor orslider is in detectThe macro that can get the sensor state when the sensor number is provided can be somethingas below:#define GET_SENSOR_STATE(SENSOR_NUMBER)qt_measure_data.qt_touch_status.sensor_states[(SENSOR_NUMBER/8)] &(1
section 5.3.2 Detect Integration for more detailsqt_drift_hold_time uint8_t Sensor drift hold time in units of 200 ms. Default value: 20 (20 x200 ms = 4s), that is hold off drifting for 4 seconds after leavingdetect. Refer to section 5.3.3 Drift Hold Time for more detailsqt_max_on_duration uint8_t Sensor maximum on duration in units of 200 ms. For example:150 = recalibrate after 30s (150 x 200 ms). 0 = recalibrationdisabled Default value: 0 (recalibration disabled). Refer tosection 5.3.4 Maximum ON Duration for more details.qt_neg_drift_rate uint8_t Sensor negative drift rate in units of 200 ms. Default value: 20(20 x 200 ms = 4s per LSB). Refer to section 5.3.5 Positive /Negative Drift for more detailsqt_pos_drift_rate uint8_t Sensor positive drift rate in units of 200 ms. Default value: 5 (5 x200 ms = 1s per LSB). Refer to section 5.3.5 Positive / NegativeDrift for more detailsqt_pos_recal_delay uint8_t Sensor positive recalibration delay. Default: 3. Refer to section5.3.6 for more details.The measurement limit for touch sensing using QTouch acquisition method is hard coded as8192.The QTouch library exports a variable of this type so that the user can specify the thresholdparameters for the library. The API qt_set_parameters() should be called to apply the parametersspecified.extern qt_touch_lib_config_data_t qt_config_data;qt_touch_lib_measure_data_tStructure qt_touch_lib_measure_data_tInput / Output Output from the libraryUseData structure which holds the sensor and channel states and values.Fields Type Commentchannel_signals uint16_t The measured signal on each channel.channel_references uint16_t The reference signal for each channel.qt_touch_status qt_touch_status_t The state and position of the configured sensorsThe QTouch library exports a variable of this type which can be accessed to retrieve the touchstatus of all the sensors.extern qt_touch_lib_measure_data_t qt_measure_data;qt_burst_lengthsStructureInput / OutputUseqt_burst_lengthsInput to the libraryNOTE: Applicable only to the QMatrix acquisition method librariesThis data structure is used to specify the burst lengths for each of the QMatrixchannelsFields Type Commentqt_burst_lengths[] uint8_t The burst length for each of the QMatrix channel in units of pulses. Defaultvalue: 64 pulses.These values can be configured for each channel individually.27
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 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 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
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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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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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