CN113721095A - Sensitivity calibration method of touch system, microcontroller and touch system - Google Patents

Abstract

The disclosure provides a sensitivity calibration method of a touch system, a microcontroller and the touch system. The sensitivity calibration method comprises the following steps: acquiring a current oscillation frequency corresponding to a voltage difference between a current first control voltage and a current second control voltage; the current first control voltage is a voltage currently used for adjusting the sensitivity of the first touch module, and the current second control voltage is a voltage currently used for adjusting the sensitivity of the second touch module; under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is larger than a preset threshold value, adjusting the current first control voltage or the current second control voltage, and returning to the step of acquiring the current oscillation frequency; and under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is less than or equal to a preset threshold value, finishing the sensitivity calibration of the touch system. The present disclosure enables automatic calibration of the sensitivity of a touch system.

Description

Sensitivity calibration method of touch system, microcontroller and touch system

Technical Field

The disclosure relates to the technical field of touch control, in particular to a sensitivity calibration method of a touch control system, a microcontroller and the touch control system.

Background

In a track dimming system, it is necessary to adjust the transmittance of a dimming layer by key touch. In order to adapt to different environment variables, such as different front glass thicknesses, different electric field environments, and the like, the sensitivity of the touch key needs to be set to an adjustable mode. Generally, a Microcontroller (MCU) can control a digital potentiometer to output a control voltage through a control signal to adjust the potential of a sensitivity pin of a touch chip, so as to adjust the sensitivity of a key. In order to adjust the sensitivity of the different keys to be consistent, the microcontroller may send the same control signal to the different digital potentiometers.

However, in the practical application process, because the digital potentiometers have performance differences, even if the control signals of the microcontroller are the same, the control voltages output by different digital potentiometers also have differences, so that the sensitivities of corresponding different keys are difficult to adjust consistently, for example, a left key is very sensitive, and can be sensed by lightly touching, but a right key needs to be pressed with great force to sense, so that the touch experience of a user is poor.

Disclosure of Invention

The disclosure provides a sensitivity calibration method of a touch system, a microcontroller and the touch system.

In a first aspect, the present disclosure provides a sensitivity calibration method for a touch system, where the touch system includes a first touch module and a second touch module, and the sensitivity calibration method includes:

acquiring a current oscillation frequency corresponding to a voltage difference between a current first control voltage and a current second control voltage; the current first control voltage is a voltage currently used for adjusting the sensitivity of the first touch module, and the current second control voltage is a voltage currently used for adjusting the sensitivity of the second touch module;

under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is larger than a preset threshold value, adjusting the current first control voltage or the current second control voltage, and returning to the step of acquiring the current oscillation frequency;

and under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is smaller than or equal to a preset threshold value, finishing the sensitivity calibration of the touch system.

In some embodiments, before the adjusting the current first control voltage or the current second control voltage, further comprising:

and storing the current frequency difference as a historical frequency difference.

In some embodiments, the step of adjusting the current first control voltage or the current second control voltage includes:

performing preliminary adjustment on the current first control voltage or the current second control voltage;

re-acquiring the current oscillation frequency after the initial adjustment;

and adjusting the current first control voltage or the current second control voltage based on the comparison result of the current frequency difference and the historical frequency difference, wherein the current frequency difference is the difference between the preliminarily adjusted current oscillation frequency and the reference oscillation frequency.

In some embodiments, the preliminary adjusting the current first control voltage or the current second control voltage includes:

adjusting the current first control voltage, or adjusting the current second control voltage;

wherein the adjustment process comprises: increasing the preset basic voltage value or decreasing the preset basic voltage value.

In some embodiments, in a case where the current first control voltage is increased by a preset basic voltage value in the preliminary adjustment process, the adjusting the current first control voltage or the current second control voltage based on a comparison result of the current frequency difference with the historical frequency difference includes:

acquiring a current voltage adjustment value corresponding to the current frequency difference;

when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value;

and when the comparison result is that the current frequency difference is smaller than the historical frequency difference, increasing the current first control voltage by a voltage corresponding to the current voltage adjustment value, or decreasing the current second control voltage by a voltage corresponding to the current voltage adjustment value.

In some embodiments, in a case where the current second control voltage is increased by a preset basic voltage value in the preliminary adjustment process, the adjusting the current first control voltage or the current second control voltage based on a comparison result of the current frequency difference with the historical frequency difference includes:

acquiring a current voltage adjustment value corresponding to the current frequency difference;

when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current second control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value;

and increasing the current second control voltage by a voltage corresponding to the current voltage adjustment value or decreasing the current first control voltage by a voltage corresponding to the current voltage adjustment value under the condition that the comparison result is that the current frequency difference is smaller than the historical frequency difference.

In a second aspect, the present disclosure provides a microcontroller comprising:

the acquisition module is used for acquiring the current oscillation frequency corresponding to the voltage difference between the current first control voltage and the current second control voltage; the current first control voltage is a voltage currently used for adjusting the sensitivity of the first touch module, and the current second control voltage is a voltage currently used for adjusting the sensitivity of the second touch module;

the adjusting module is used for adjusting the current first control voltage or the current second control voltage under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is larger than a preset threshold value, and returning to the step of acquiring the current oscillation frequency by the acquiring module;

and the control module is used for finishing the sensitivity calibration of the touch system under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is less than or equal to a preset threshold value.

In some embodiments, the microcontroller further comprises:

and the storage module is used for storing the current frequency difference as a historical frequency difference.

In some embodiments, the adjustment module comprises a first adjustment unit and a second adjustment unit;

the first adjusting unit is used for carrying out preliminary adjustment on the current first control voltage or the current second control voltage;

the acquisition module is further configured to re-acquire the initially adjusted current oscillation frequency;

the second adjusting unit is configured to adjust a current first control voltage or a current second control voltage based on a comparison result between a current frequency difference and the historical frequency difference, where the current frequency difference is a difference between the preliminarily adjusted current oscillation frequency and a reference oscillation frequency.

In some embodiments, the first adjusting unit is specifically configured to perform adjustment processing on a current first control voltage, or perform adjustment processing on a current second control voltage;

wherein the adjustment process comprises: increasing the preset basic voltage value or decreasing the preset basic voltage value.

In some embodiments, in the case that the first adjusting unit increases the current first control voltage by a preset basic voltage value in the preliminary adjustment process, the second adjusting unit is configured to:

acquiring a current voltage adjustment value corresponding to the current frequency difference;

when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value;

and when the comparison result is that the current frequency difference is smaller than the historical frequency difference, increasing the current first control voltage by a voltage corresponding to the current voltage adjustment value, or decreasing the current second control voltage by a voltage corresponding to the current voltage adjustment value.

In some embodiments, in the case that the first adjusting unit increases the current second control voltage by a preset basic voltage value in the preliminary adjustment process, the second adjusting unit is configured to:

acquiring a current voltage adjustment value corresponding to the current frequency difference;

when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current second control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value;

and increasing the current second control voltage by a voltage corresponding to the current voltage adjustment value or decreasing the current first control voltage by a voltage corresponding to the current voltage adjustment value under the condition that the comparison result is that the current frequency difference is smaller than the historical frequency difference.

In a third aspect, the present disclosure provides a touch system comprising a first touch module, a second touch module, a feedback signal processing circuit, and a microcontroller as provided in the second aspect of the present disclosure;

the feedback signal processing circuit is used for acquiring a current oscillation frequency corresponding to a voltage difference between a current first control voltage and a current second control voltage;

the microcontroller is configured to receive the current oscillation frequency and calibrate the sensitivity of the first touch module and the sensitivity of the second touch module based on the current oscillation frequency.

In some embodiments, the touch system further comprises: a first touch voltage generating device corresponding to the first touch module and a second touch voltage generating device corresponding to the second touch module;

the microcontroller is used for outputting a current first control signal to the first touch voltage generation device and adjusting the current first control signal according to the current first control voltage after each adjustment;

the first touch control voltage generating device is used for generating a current first control voltage according to a current first control signal of the microcontroller;

the microcontroller is further configured to output a current second control signal to the second touch voltage generation device, and adjust the current second control signal according to the current second control voltage adjusted each time;

the second touch voltage generating device is used for generating a current second control voltage according to a current second control signal of the microcontroller.

In some embodiments, the feedback signal processing circuit comprises: an operational amplifier, a voltage-controlled oscillation circuit and a low-pass filter;

the operational amplifier is used for acquiring the voltage difference between the current first control voltage and the current second control voltage;

the voltage-controlled oscillation circuit is used for acquiring a current oscillation frequency corresponding to a voltage difference between the current first control voltage and the current second control voltage;

and the low-pass filter is used for filtering the current oscillation frequency to filter noise signals.

Drawings

Fig. 1 is a flowchart of a sensitivity calibration method of a touch system according to an embodiment of the present disclosure;

fig. 2 is a flowchart of another sensitivity calibration method for a touch system according to an embodiment of the present disclosure;

fig. 3 is a flowchart of a sensitivity calibration method of a touch system according to another embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a microcontroller according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a touch system according to an embodiment of the disclosure.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the embodiment of the present disclosure, the sensitivity calibration method of the touch system, the microcontroller and the technical solution of the touch system provided by the embodiment of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiment of the present disclosure.

Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, but which may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements/structures, these elements/structures should not be limited by these terms. These terms are only used to distinguish one element/structure from another element/structure.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Fig. 1 is a flowchart of a sensitivity calibration method of a touch system according to an embodiment of the present disclosure. The sensitivity calibration method of the touch system is applied to a microcontroller in the touch system, wherein the touch system further comprises a first touch module and a second touch module.

As shown in fig. 1, the sensitivity calibration method of the touch system provided by the embodiment of the present disclosure includes the following steps:

step S101, obtaining a current oscillation frequency corresponding to a voltage difference between a current first control voltage and a current second control voltage.

The current first control voltage is a voltage currently used for adjusting the sensitivity of the first touch module, and the current second control voltage is a voltage currently used for adjusting the sensitivity of the second touch module. The voltage difference between the current first control voltage and the current second control voltage is an absolute value obtained by subtracting a voltage value corresponding to the current first control voltage and a voltage value corresponding to the current second control voltage. The current oscillation frequency is a current oscillation frequency corresponding to the current first control voltage, and the current oscillation frequency is a current oscillation frequency corresponding to the current second control voltage.

In some embodiments, the current oscillation frequency is obtained by a feedback signal processing circuit for which the inputs are the current first control voltage and the current second control voltage and the output is the current oscillation frequency.

In one embodiment, the feedback signal processing circuit still has an output frequency which is a reference oscillation frequency when the voltage difference between the two input voltages is 0. Therefore, when the voltage difference between the current first control voltage and the current second control voltage is 0, the current oscillation frequency is the reference oscillation frequency.

In one embodiment, to ensure that the sensitivity of the first touch module and the sensitivity of the second touch module meet the requirement of consistent sensitivity, the voltage difference between the current first control voltage and the current second control voltage is required to be smaller than a preset error, where the preset error may be 2LSB (Least Significant Bit). That is, the current frequency difference between the current oscillation frequency and the reference oscillation frequency needs to be less than or equal to the preset threshold. The preset threshold value is a frequency value correspondingly set based on a preset error. For example, the predetermined threshold may be a difference between an oscillation frequency corresponding to the 2LSB voltage difference and a reference oscillation frequency.

Step S102, determining whether a current frequency difference between the current oscillation frequency and the reference oscillation frequency is greater than a preset threshold.

The sensitivity of the first touch module and the sensitivity of the second touch module can be determined whether to meet the requirement of consistent sensitivity by judging whether the current frequency difference between the current oscillation frequency and the reference oscillation frequency is greater than a preset threshold value.

Step 103, under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is larger than a preset threshold, adjusting the current first control voltage or the current second control voltage, and returning to the step of acquiring the current oscillation frequency.

When the current frequency difference between the current oscillation frequency and the reference oscillation frequency is greater than the preset threshold, it indicates that the sensitivity of the first touch module and the sensitivity of the second touch module are poor in consistency, and sensitivity calibration is required. Therefore, the current first control voltage or the current second control voltage is adjusted to calibrate the sensitivity, and the step of obtaining the current oscillation frequency is returned to determine whether the sensitivity of the first touch module and the sensitivity of the second touch module meet the requirement of consistent sensitivity after the current first control voltage or the current second control voltage is adjusted. In the embodiment, a negative feedback mechanism is introduced to automatically adjust the current first control voltage or the current second control voltage, so as to calibrate the sensitivity.

And step S104, under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is less than or equal to a preset threshold value, finishing the sensitivity calibration of the touch system.

When the current frequency difference between the current oscillation frequency and the reference oscillation frequency is less than or equal to the preset threshold, it indicates that the sensitivity of the first touch module and the sensitivity of the second touch module are high in consistency, and at this time, the sensitivity calibration is not required, and the process of calibrating the sensitivity of the touch system can be finished.

The embodiment of the disclosure provides a sensitivity calibration method for a touch system, which includes first obtaining a current oscillation frequency corresponding to a voltage difference between a current first control voltage and a current second control voltage, wherein the current first control voltage is a voltage currently used for adjusting the sensitivity of the first touch module, the current second control voltage is a voltage currently used to adjust the sensitivity of the second touch module, and then, adjusting the current first control voltage or the current second control voltage when the current frequency difference between the current oscillation frequency and the reference oscillation frequency is larger than a preset threshold value, and returning to the step of obtaining the current oscillation frequency, the sensitivity of the touch system can be automatically calibrated, and under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is smaller than or equal to a preset threshold value, finishing the sensitivity calibration of the touch system.

Fig. 2 is a flowchart of another sensitivity calibration method for a touch system according to an embodiment of the present disclosure. In one embodiment, when the current oscillation frequency is greater than the preset threshold (step S103), it indicates that the consistency between the sensitivity of the first touch module and the sensitivity of the second touch module is poor, and it is necessary to perform sensitivity calibration, that is, it is necessary to adjust the current first control voltage or the current second control voltage. However, since the magnitude relationship between the current first control voltage and the current second control voltage is unknown, it is difficult to determine the adjustment direction (increase voltage or decrease voltage) when the current first control voltage or the current second control voltage is adjusted. Therefore, the embodiment of the present disclosure provides another sensitivity calibration method for a touch system, which, before adjusting the current first control voltage or the current second control voltage, as shown in fig. 2, further includes step S201:

step S201 stores the current frequency difference as a historical frequency difference.

After storing the current frequency difference as the historical frequency difference, as shown in fig. 2, the step of adjusting the current first control voltage or the current second control voltage in this embodiment includes:

step S202, performing a preliminary adjustment on the current first control voltage or the current second control voltage.

In one embodiment, the preliminary adjustment of the current first control voltage or the current second control voltage includes: and adjusting the current first control voltage, or adjusting the current second control voltage.

Wherein the adjustment process comprises: increasing the preset basic voltage value or decreasing the preset basic voltage value. The preset basic voltage value is a minimum adjustment unit for adjusting the control voltage, and is, for example, 1 LSB.

And step S203, the current oscillation frequency after the initial adjustment is obtained again.

Step S204, based on the comparison result between the current frequency difference and the historical frequency difference, adjusting the current first control voltage or the current second control voltage.

Wherein, the current frequency difference is the difference between the preliminarily adjusted current oscillation frequency and the reference oscillation frequency.

It should be noted that, in this embodiment, the current first control voltage or the current second control voltage is preliminarily adjusted when the current oscillation frequency is greater than the preset threshold, that is, a voltage difference between the current first control voltage and the current second control voltage before the preliminary adjustment is greater than 2 LSB. And the adjustment processing only increases the preset basic voltage value (1LSB) or decreases the preset basic voltage value (1LSB), so that after the current first control voltage or the current second control voltage is primarily adjusted, the magnitude relationship between the current first control voltage and the current second control voltage will not change, and the current frequency difference and the historical frequency difference will not be equal.

It should be further noted that, through the above steps S202 to S203 and the comparison result between the current frequency difference and the historical frequency difference in step S204, the magnitude relationship between the current first control voltage and the current second control voltage can be determined. For example:

the first condition is as follows: in the preliminary adjustment process of step S202, a preset basic voltage value is added to the current first control voltage, and when the comparison result is that the current frequency difference is greater than the historical frequency difference, it is determined that the current first control voltage is greater than the current second control voltage. In this case, the current first control voltage may be adjusted smaller, or the current second control voltage may be adjusted larger.

In this case, when the current first control voltage is increased by the preset basic voltage value, the current frequency difference is greater than the historical frequency difference, which indicates that the current oscillation frequency becomes larger, that is, the voltage difference between the current first control voltage and the current second control voltage becomes larger. And only when the current first control voltage is larger than the current second control voltage, the current first control voltage is increased by a preset basic voltage value, and the voltage difference between the current first control voltage and the current second control voltage is increased.

Case two: in the preliminary adjustment process of step S202, the current first control voltage is increased by a preset basic voltage value, and when the comparison result is that the current frequency difference is smaller than the historical frequency difference, it is determined that the current first control voltage is smaller than the current second control voltage. In this case, the current first control voltage may be adjusted to be larger, or the current second control voltage may be adjusted to be smaller.

Case three: in the preliminary adjustment process of step S202, a preset basic voltage value is added to the current second control voltage, and the comparison result indicates that the current first control voltage is smaller than the current second control voltage when the current frequency difference is larger than the historical frequency difference. In this case, the current first control voltage may be adjusted to be larger, or the current second control voltage may be adjusted to be smaller.

Case four: in the preliminary adjustment process of step S202, a preset basic voltage value is added to the current second control voltage, and the comparison result indicates that the current frequency difference is smaller than the historical frequency difference, and the current first control voltage is larger than the current second control voltage. In this case, the current first control voltage may be adjusted smaller, or the current second control voltage may be adjusted larger.

Case five: in the preliminary adjustment process of step S202, the current first control voltage is decreased by the preset basic voltage value, and the comparison result is that the current first control voltage is smaller than the current second control voltage when the current frequency difference is larger than the historical frequency difference. In this case, the current first control voltage may be adjusted to be larger, or the current second control voltage may be adjusted to be smaller.

In this case, when the current first control voltage is decreased by the preset basic voltage value, the current frequency difference is greater than the historical frequency difference, which indicates that the current oscillation frequency becomes larger, that is, the voltage difference between the current first control voltage and the current second control voltage becomes larger. And only when the current first control voltage is smaller than the current second control voltage, the current first control voltage is reduced by the preset basic voltage value, and the voltage difference between the current first control voltage and the current second control voltage is increased.

Case six: in the preliminary adjustment process of step S202, the current first control voltage is decreased by the preset basic voltage value, and the comparison result is that the current first control voltage is greater than the current second control voltage when the current frequency difference is smaller than the historical frequency difference. In this case, the current first control voltage may be adjusted smaller, or the current second control voltage may be adjusted larger.

Case seven: in the preliminary adjustment process of step S202, the current second control voltage is decreased by the preset basic voltage value, and the current first control voltage is greater than the current second control voltage when the comparison result indicates that the current frequency difference is greater than the historical frequency difference. In this case, the current first control voltage may be adjusted smaller, or the current second control voltage may be adjusted larger.

Case eight: in the preliminary adjustment process of step S202, the current second control voltage is decreased by the preset basic voltage value, and the comparison result is that the current first control voltage is smaller than the current second control voltage when the current frequency difference is smaller than the historical frequency difference. In this case, the current first control voltage may be adjusted to be larger, or the current second control voltage may be adjusted to be smaller.

In one embodiment, in a case where the current first control voltage is increased by a preset basic voltage value in the preliminary adjustment process, the step of adjusting the current first control voltage or the current second control voltage based on a comparison result of the current frequency difference with the historical frequency difference includes:

step one, acquiring a current voltage adjustment value corresponding to a current frequency difference.

In one embodiment, the current frequency difference may be obtained corresponding to the current voltage adjustment value based on a pre-stored correspondence table between frequencies and voltage adjustment values.

And step two, under the condition that the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value.

And when the comparison result shows that the current frequency difference is greater than the historical frequency difference, according to the first condition, the current first control voltage is greater than the current second control voltage, and in order to reduce the voltage difference between the first control voltage and the second control voltage to be within a preset error, the current first control voltage is reduced by the voltage corresponding to the current voltage adjustment value, or the current second control voltage is increased by the voltage corresponding to the current voltage adjustment value.

And step three, under the condition that the comparison result is that the current frequency difference is smaller than the historical frequency difference, increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or decreasing the current second control voltage by the voltage corresponding to the current voltage adjustment value.

And if the comparison result shows that the current frequency difference is smaller than the historical frequency difference, according to the second condition, the current first control voltage is smaller than the current second control voltage, and in order to reduce the voltage difference between the first control voltage and the second control voltage to be within a preset error, the current first control voltage is increased by a voltage corresponding to the current voltage adjustment value, or the current second control voltage is decreased by a voltage corresponding to the current voltage adjustment value.

In another embodiment, in the case that the current second control voltage is increased by a preset basic voltage value in the preliminary adjustment process, the step of adjusting the current first control voltage or the current second control voltage based on a comparison result of the current frequency difference with the historical frequency difference includes:

step one, acquiring a current voltage adjustment value corresponding to a current frequency difference.

And step two, under the condition that the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current second control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value.

And step three, under the condition that the comparison result is that the current frequency difference is smaller than the historical frequency difference, increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value, or decreasing the current first control voltage by the voltage corresponding to the current voltage adjustment value.

In still another embodiment, the step of adjusting the current first control voltage or the current second control voltage based on a comparison result of the current frequency difference with the historical frequency difference in case the current first control voltage is decreased by the preset basic voltage value in the preliminary adjustment process includes:

step one, acquiring a current voltage adjustment value corresponding to a current frequency difference.

And step two, under the condition that the comparison result is that the current frequency difference is larger than the historical frequency difference, increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or decreasing the current second control voltage by the voltage corresponding to the current voltage adjustment value.

And if the comparison result shows that the current frequency difference is greater than the historical frequency difference, according to the fifth condition, the current first control voltage is smaller than the current second control voltage, and in order to reduce the voltage difference between the first control voltage and the second control voltage to be within a preset error, the current first control voltage is increased by a voltage corresponding to the current voltage adjustment value, or the current second control voltage is decreased by a voltage corresponding to the current voltage adjustment value.

And thirdly, reducing the current first control voltage by the voltage corresponding to the current voltage adjustment value or increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value under the condition that the comparison result is that the current frequency difference is smaller than the historical frequency difference.

And when the comparison result shows that the current frequency difference is smaller than the historical frequency difference, according to the sixth condition, the current first control voltage is larger than the current second control voltage, and in order to reduce the voltage difference between the first control voltage and the second control voltage to be within a preset error, the current first control voltage is reduced by the voltage corresponding to the current voltage adjustment value, or the current second control voltage is increased by the voltage corresponding to the current voltage adjustment value.

In still another embodiment, in the case where the current second control voltage is decreased by a preset basic voltage value in the preliminary adjustment process, the step of adjusting the current first control voltage or the current second control voltage based on a result of comparing the current frequency difference with the historical frequency difference includes:

step one, acquiring a current voltage adjustment value corresponding to a current frequency difference.

And step two, under the condition that the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value.

And step three, under the condition that the comparison result is that the current frequency difference is smaller than the historical frequency difference, increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or decreasing the current second control voltage by the voltage corresponding to the current voltage adjustment value.

Fig. 3 is a flowchart of a sensitivity calibration method of a touch system according to another embodiment of the present disclosure. In one embodiment, the sensitivities of the first touch module and the second touch module in the touch system may be adjusted in advance, and the sensitivity of any one of the first touch module and the second touch module is set as a standard sensitivity by default, that is, the control voltage corresponding to the touch module is set as a standard sensitivity adjustment voltage by default. During the sensitivity calibration, the standard sensitivity adjustment voltage can be kept unchanged, and only the other control voltage is adjusted. For example, the current sensitivity of the first touch module is a default standard sensitivity, that is, the current first control voltage is a default standard sensitivity adjustment voltage, and in the process of sensitivity calibration, the first control voltage may be kept unchanged, and only the second control voltage is adjusted. In this embodiment, as shown in fig. 3, the sensitivity calibration method of the touch system includes the following steps:

step S301, obtaining a current oscillation frequency corresponding to a voltage difference between the current first control voltage and the current second control voltage.

Step S302, a current frequency difference between the current oscillation frequency and the reference oscillation frequency is obtained.

Step S303, determining whether the current frequency difference is greater than a preset threshold. In a case where the current frequency difference between the current oscillation frequency and the reference oscillation frequency is less than or equal to a preset threshold value, the following step S304 is performed. In the case where the current oscillation frequency is greater than the preset threshold value, the following step S305 is performed.

And step S304, finishing the sensitivity calibration of the touch system.

Step S305 stores the current frequency difference as a historical frequency difference.

Step S306, performing preliminary adjustment on the current second control voltage: and increasing the current second control voltage by a preset basic voltage value.

And step S307, the current oscillation frequency after the initial adjustment is obtained again.

Step S308, obtaining the current frequency difference between the preliminarily adjusted current oscillation frequency and the reference oscillation frequency.

Step S309, comparing whether the current frequency difference is smaller than the historical frequency difference. In case that the current frequency difference is larger than the historical frequency difference as a result of the comparison, the following step S310 is performed. In the case where the current frequency difference is smaller than the historical frequency difference as a result of the comparison, the following step S311 is performed.

Step S310, obtaining a current voltage adjustment value corresponding to the current frequency difference, decreasing the current second control voltage by a voltage corresponding to the current voltage adjustment value, and returning to the step of obtaining the current oscillation frequency corresponding to the voltage difference between the current first control voltage and the current second control voltage.

Step S311, obtaining a current voltage adjustment value corresponding to the current frequency difference, increasing the current second control voltage by a voltage corresponding to the current voltage adjustment value, and returning to the step of obtaining the current oscillation frequency corresponding to the voltage difference between the current first control voltage and the current second control voltage.

By the sensitivity calibration method of the touch system provided by the embodiment of the disclosure, the sensitivity of the touch system can be self-calibrated without manual configuration and trial and error, and the debugging cost can be saved.

Fig. 4 is a schematic structural diagram of a microcontroller according to an embodiment of the present disclosure. As shown in fig. 4, the microcontroller includes: an acquisition module 41, an adjustment module 42, and a control module 43.

The obtaining module 41 is configured to obtain a current oscillation frequency corresponding to a voltage difference between the current first control voltage and the current second control voltage.

The current first control voltage is a voltage currently used for adjusting the sensitivity of the first touch module, and the current second control voltage is a voltage currently used for adjusting the sensitivity of the second touch module.

An adjusting module 42, configured to adjust the current first control voltage or the current second control voltage when a current frequency difference between the current oscillation frequency and the reference oscillation frequency is greater than a preset threshold, and return to the step of acquiring the current oscillation frequency by the acquiring module 41.

In one embodiment, the microcontroller further comprises: and a storage module. The storage module is used for storing the current frequency difference as a historical frequency difference.

In one embodiment, the adjustment module includes a first adjustment unit and a second adjustment unit.

The first adjusting unit is used for primarily adjusting the current first control voltage or the current second control voltage.

The first adjusting unit is specifically configured to perform adjustment processing on a current first control voltage, or perform adjustment processing on a current second control voltage; wherein the adjustment process includes: increasing the preset basic voltage value or decreasing the preset basic voltage value.

The acquisition module is further configured to re-acquire the initially adjusted current oscillation frequency.

The second adjusting unit is configured to adjust the current first control voltage or the current second control voltage based on a comparison result between the current frequency difference and the historical frequency difference. Wherein, the current frequency difference is the difference between the preliminarily adjusted current oscillation frequency and the reference oscillation frequency.

In an embodiment, when the first adjusting unit increases the current first control voltage by a preset basic voltage value in the preliminary adjustment process, the second adjusting unit is specifically configured to: acquiring a current voltage adjustment value corresponding to the current frequency difference; when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value; and under the condition that the current frequency difference is smaller than the historical frequency difference as a comparison result, increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or decreasing the current second control voltage by the voltage corresponding to the current voltage adjustment value.

In another embodiment, when the first adjusting unit increases the current second control voltage by the preset basic voltage value in the preliminary adjustment process, the second adjusting unit is specifically configured to: acquiring a current voltage adjustment value corresponding to the current frequency difference; when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current second control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value; and under the condition that the current frequency difference is smaller than the historical frequency difference as a comparison result, increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value, or decreasing the current first control voltage by the voltage corresponding to the current voltage adjustment value.

And the control module 43 is configured to end the sensitivity calibration of the touch system when the current frequency difference between the current oscillation frequency and the reference oscillation frequency is smaller than or equal to a preset threshold.

The embodiment of the disclosure provides a microcontroller, an obtaining module is configured to obtain a current oscillation frequency corresponding to a voltage difference between a current first control voltage and a current second control voltage, where the current first control voltage is a voltage currently used for adjusting a sensitivity of a first touch module, the current second control voltage is a voltage currently used for adjusting a sensitivity of a second touch module, an adjusting module is configured to adjust the current first control voltage or the current second control voltage when the current oscillation frequency is greater than a preset threshold, and return to a step of obtaining the current oscillation frequency by the obtaining module, so that automatic calibration of the sensitivity of a touch system can be performed, and a control module finishes calibration of the sensitivity of the touch system when the current oscillation frequency is less than or equal to the preset threshold.

Fig. 5 is a schematic structural diagram of a touch system according to an embodiment of the disclosure. As shown in fig. 5, the touch system includes: a first touch module 51, a second touch module 52, a feedback signal processing circuit 53 and a microcontroller 54.

Each touch module comprises a sensing device and a touch driving chip. For example, the first touch module 51 includes a first sensing device and a first touch driving chip, and the second touch module 52 includes a second sensing device and a second touch driving chip.

In one embodiment, the touch system includes a track dimming system, and the sensing device can be a touch key, such as a self-contained key light bar made of ITO material. The first touch module 51 may be a left touch button of the track dimming system, and the second touch module 52 may be a right touch button of the track dimming system.

In one embodiment, the touch driving chip is connected to the sensing device, and is configured to monitor a triggering event of the sensing device by the touch driving chip. In addition, the first touch driving chip in the first touch module 51 and the second touch driving chip in the second touch module 52 are further connected to a General-purpose input/output interface (GPIO) of the microcontroller 54, respectively, for sending a touch detection signal to the microcontroller 54, so as to complete a control procedure of monitoring a trigger event of the whole sensing device.

The feedback signal processing circuit 53 is configured to obtain a current oscillation frequency corresponding to a voltage difference between the current first control voltage and the current second control voltage.

In one embodiment, the feedback signal processing circuit 53 is connected to a general input/output interface of the microcontroller 54, the feedback signal processing circuit 53 inputs the current oscillation frequency to the general input/output interface, and the microcontroller 54 detects the current oscillation frequency by counting the number of rising edge detections of the signal received by the general input/output interface, thereby achieving accurate detection of the current oscillation frequency.

The microcontroller 54 is configured to receive the current oscillation frequency and calibrate the sensitivities of the first touch module 51 and the second touch module 52 based on the current oscillation frequency.

In one embodiment, the touch system further includes: a first touch voltage generating device 55 corresponding to the first touch module 51 and a second touch voltage generating device 56 corresponding to the second touch module 52.

The microcontroller 54 is configured to output a current first control signal to the first touch voltage generating device 55, and adjust the current first control signal according to the current first control voltage after each adjustment.

The first touch voltage generating device 55 is used for generating a current first control voltage according to a current first control signal of the microcontroller 54.

The microcontroller 54 is further configured to output a current second control signal to the second touch voltage generating device 56, and adjust the current second control signal according to the current second control voltage after each adjustment.

The second touch voltage generating device 56 is used for generating a current second control voltage according to a current second control signal of the microcontroller 54.

In one embodiment, the touch voltage generating device may be a Digital Potentiometer (Digital Potentiometer).

In one embodiment, the feedback signal processing circuit 53 specifically includes: an Operational Amplifier (OPA) 531, a Voltage Controlled Oscillator (VCO) 532, and a Low-pass filter (Low-pass filter) 533.

The operational amplifier 531 is configured to obtain a voltage difference between the current first control voltage and the current second control voltage.

The voltage-controlled oscillation circuit 532 is configured to obtain a current oscillation frequency corresponding to a voltage difference between the current first control voltage and the current second control voltage.

In one embodiment, the operational amplifier 531 may further amplify a voltage difference between the current first control voltage and the current second control voltage to an effective input range of the voltage-controlled oscillation circuit 532. The effective input range of the voltage-controlled oscillation circuit 532 is set based on the specific model of the voltage-controlled oscillation circuit, and is not specifically limited in this embodiment.

The low-pass filter 533 is configured to filter the current oscillation frequency to filter out a noise signal.

In one implementation scenario, the adjustment of the sensitivity of the first touch module 51 and the second touch module 52 is implemented by the microcontroller 54, the first touch voltage generating device 55 corresponding to the first touch module 51, and the second touch voltage generating device 56 corresponding to the second touch module 52.

Specifically, the first touch module 51 reads the current first control voltage output by the first touch voltage generating device 55, and adjusts the sensitivity based on the current first control voltage, specifically, the touch driving chip of the first touch module 51 adjusts the sensitivity of detecting the event received by the sensing device by the detection pulse (Detect pulse) by reading the current first control voltage output by the first touch voltage generating device 55. The second touch module 52 reads the current second control voltage output by the second touch voltage generating device 56, and adjusts the sensitivity based on the current second control voltage, specifically, the touch driving chip of the second touch module 52 adjusts the sensitivity of detecting the sensing device receiving event by the detection pulse (Detect pulse) by reading the current second control voltage output by the second touch voltage generating device 56.

In an implementation scenario, due to performance differences of the control touch voltage generation devices, conversion accuracy is lost in the process of analog-to-digital conversion or digital-to-analog conversion, and control voltages output by different control touch voltage generation devices for the same control signal are also different, so that sensitivities of corresponding different touch modules are difficult to adjust uniformly. Accordingly, the sensitivities of the first touch module 51 and the second touch module 52 are calibrated. The sensitivity calibration of the first touch module 51 and the second touch module 52 is realized by the feedback signal processing circuit 53, the microcontroller 54, the first touch voltage generating device 55 corresponding to the first touch module 51, and the second touch voltage generating device 56 corresponding to the second touch module 52. The input end of the operational amplifier 531 in the feedback signal processing circuit 53 is connected to the output ends of the first touch voltage generating device 55 and the second touch voltage generating device 56, the output end of the operational amplifier 531 is connected to the input end of the voltage controlled oscillating circuit 532, the output end of the voltage controlled oscillating circuit 532 is connected to the input end of the low pass filter 533, and the output end of the low pass filter 533 in the feedback signal processing circuit 53 is connected to a general input/output interface of the microcontroller 54. According to the embodiment of the disclosure, the control voltages of different touch module sensitivities are calibrated through a frequency negative feedback mechanism dominated by a feedback signal processing circuit, so that the consistency of the control voltages of the touch module sensitivities is realized.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.

Claims (15)

1. A sensitivity calibration method of a touch system, wherein the touch system comprises a first touch module and a second touch module, the sensitivity calibration method comprising:

acquiring a current oscillation frequency corresponding to a voltage difference between a current first control voltage and a current second control voltage; the current first control voltage is a voltage currently used for adjusting the sensitivity of the first touch module, and the current second control voltage is a voltage currently used for adjusting the sensitivity of the second touch module;

under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is larger than a preset threshold value, adjusting the current first control voltage or the current second control voltage, and returning to the step of acquiring the current oscillation frequency;

and under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is smaller than or equal to a preset threshold value, finishing the sensitivity calibration of the touch system.

2. The method of claim 1, further comprising, prior to the adjusting the current first control voltage or the current second control voltage:

and storing the current frequency difference as a historical frequency difference.

3. The method of claim 2, wherein the step of adjusting the current first control voltage or the current second control voltage comprises:

performing preliminary adjustment on the current first control voltage or the current second control voltage;

re-acquiring the current oscillation frequency after the initial adjustment;

and adjusting the current first control voltage or the current second control voltage based on the comparison result of the current frequency difference and the historical frequency difference, wherein the current frequency difference is the difference between the preliminarily adjusted current oscillation frequency and the reference oscillation frequency.

4. The method of claim 3, wherein the preliminary adjusting the current first control voltage or the current second control voltage comprises:

adjusting the current first control voltage, or adjusting the current second control voltage;

wherein the adjustment process comprises: increasing the preset basic voltage value or decreasing the preset basic voltage value.

5. The method according to claim 4, wherein the step of adjusting the current first control voltage or the current second control voltage based on the comparison result of the current frequency difference with the historical frequency difference in case of increasing the current first control voltage by a preset basic voltage value in a preliminary adjustment process comprises:

acquiring a current voltage adjustment value corresponding to the current frequency difference;

when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value;

and when the comparison result is that the current frequency difference is smaller than the historical frequency difference, increasing the current first control voltage by a voltage corresponding to the current voltage adjustment value, or decreasing the current second control voltage by a voltage corresponding to the current voltage adjustment value.

6. The method according to claim 4, wherein the step of adjusting the current first control voltage or the current second control voltage based on the comparison result of the current frequency difference with the historical frequency difference in case of increasing the current second control voltage by a preset basic voltage value in a preliminary adjustment process comprises:

acquiring a current voltage adjustment value corresponding to the current frequency difference;

when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current second control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value;

and increasing the current second control voltage by a voltage corresponding to the current voltage adjustment value or decreasing the current first control voltage by a voltage corresponding to the current voltage adjustment value under the condition that the comparison result is that the current frequency difference is smaller than the historical frequency difference.

7. A microcontroller, characterized in that the microcontroller comprises:

the acquisition module is used for acquiring the current oscillation frequency corresponding to the voltage difference between the current first control voltage and the current second control voltage; the current first control voltage is a voltage currently used for adjusting the sensitivity of the first touch module, and the current second control voltage is a voltage currently used for adjusting the sensitivity of the second touch module;

the adjusting module is used for adjusting the current first control voltage or the current second control voltage under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is larger than a preset threshold value, and returning to the step of acquiring the current oscillation frequency by the acquiring module;

and the control module is used for finishing the sensitivity calibration of the touch system under the condition that the current frequency difference between the current oscillation frequency and the reference oscillation frequency is less than or equal to a preset threshold value.

8. The microcontroller of claim 7, further comprising:

and the storage module is used for storing the current frequency difference as a historical frequency difference.

9. The microcontroller of claim 8, wherein the adjustment module comprises a first adjustment unit and a second adjustment unit;

the first adjusting unit is used for carrying out preliminary adjustment on the current first control voltage or the current second control voltage;

the acquisition module is further configured to re-acquire the initially adjusted current oscillation frequency;

the second adjusting unit is configured to adjust a current first control voltage or a current second control voltage based on a comparison result between a current frequency difference and the historical frequency difference, where the current frequency difference is a difference between the preliminarily adjusted current oscillation frequency and a reference oscillation frequency.

10. The microcontroller according to claim 9, wherein the first adjusting unit is specifically configured to adjust a current first control voltage or adjust a current second control voltage;

wherein the adjustment process comprises: increasing the preset basic voltage value or decreasing the preset basic voltage value.

11. The microcontroller according to claim 10, wherein the first adjusting unit, in case of increasing the current first control voltage by a preset basic voltage value during a preliminary adjustment, is configured to:

acquiring a current voltage adjustment value corresponding to the current frequency difference;

when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current first control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current second control voltage by the voltage corresponding to the current voltage adjustment value;

and when the comparison result is that the current frequency difference is smaller than the historical frequency difference, increasing the current first control voltage by a voltage corresponding to the current voltage adjustment value, or decreasing the current second control voltage by a voltage corresponding to the current voltage adjustment value.

12. The microcontroller according to claim 10, wherein the first adjusting unit, in case of increasing the current second control voltage by a preset basic voltage value in a preliminary adjustment process, is configured to:

acquiring a current voltage adjustment value corresponding to the current frequency difference;

when the comparison result is that the current frequency difference is larger than the historical frequency difference, reducing the current second control voltage by the voltage corresponding to the current voltage adjustment value, or increasing the current first control voltage by the voltage corresponding to the current voltage adjustment value;

and increasing the current second control voltage by a voltage corresponding to the current voltage adjustment value or decreasing the current first control voltage by a voltage corresponding to the current voltage adjustment value under the condition that the comparison result is that the current frequency difference is smaller than the historical frequency difference.

13. A touch system comprising a first touch module, a second touch module, a feedback signal processing circuit, and a microcontroller according to any one of claims 7-12;

the feedback signal processing circuit is used for acquiring a current oscillation frequency corresponding to a voltage difference between a current first control voltage and a current second control voltage;

the microcontroller is configured to receive the current oscillation frequency and calibrate the sensitivity of the first touch module and the sensitivity of the second touch module based on the current oscillation frequency.

14. The touch system of claim 13, further comprising: a first touch voltage generating device corresponding to the first touch module and a second touch voltage generating device corresponding to the second touch module;

the microcontroller is used for outputting a current first control signal to the first touch voltage generation device and adjusting the current first control signal according to the current first control voltage after each adjustment;

the first touch control voltage generating device is used for generating a current first control voltage according to a current first control signal of the microcontroller;

the microcontroller is further configured to output a current second control signal to the second touch voltage generation device, and adjust the current second control signal according to the current second control voltage adjusted each time;

the second touch voltage generating device is used for generating a current second control voltage according to a current second control signal of the microcontroller.

15. The touch system of claim 14, wherein the feedback signal processing circuit comprises: an operational amplifier, a voltage-controlled oscillation circuit and a low-pass filter;

the operational amplifier is used for acquiring the voltage difference between the current first control voltage and the current second control voltage;

the voltage-controlled oscillation circuit is used for acquiring a current oscillation frequency corresponding to a voltage difference between the current first control voltage and the current second control voltage;

and the low-pass filter is used for filtering the current oscillation frequency to filter noise signals.

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