CN113970987A - Multi-chip cascaded capacitive touch screen driving system and method - Google Patents
Multi-chip cascaded capacitive touch screen driving system and method Download PDFInfo
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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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Abstract
The embodiment of the invention provides a multi-chip cascaded capacitive touch screen driving system and method, and belongs to the technical field of touch control. The system comprises: each touch control chip is connected with one touch control area, and all the touch control areas are combined to form a complete touch control screen; each touch chip is used for processing touch signals of the corresponding connected touch areas; the plurality of touch control chips are parallelly accessed to a main control chip, and the working state of each touch control chip is coordinated and controlled by the main control chip. According to the scheme of the invention, the touch response time is not influenced on the premise that the driving channel of the touch chip meets the driving requirement of the large-size touch screen.
Description
Technical Field
The invention relates to the technical field of touch control, in particular to a multi-chip cascaded capacitive touch screen driving system and a multi-chip cascaded capacitive touch screen driving method.
Background
The capacitive touch screen gradually replaces a resistive touch screen by the technical advantages of supporting multi-point touch, being sensitive in response and the like, and is widely applied to different fields. With the increasing demand of the market for the capacitive touch screen, the size requirement for the touch screen is also increasing. With the increase of the size of the touch screen, higher requirements are put forward on the control accuracy and the response timeliness of the touch screen. The existing driving device can meet the user requirements when the small-size touch screen signal processing is carried out, but the number of channels of a single capacitive touch chip is limited, and the single capacitive touch chip can not meet the requirements after all along with the increasing size of the touch screen. Based on the problem that the performance of the existing touch screen driving device is limited and cannot meet the driving requirement of the touch screen with the increasing size, a new capacitive touch screen driving system needs to be created.
Disclosure of Invention
The invention aims to provide a multi-chip cascaded capacitive touch screen driving system and a multi-chip cascaded capacitive touch screen driving method, which are used for at least solving the problems that the performance of the conventional touch screen driving device is limited and the driving requirement of a touch screen with an increasing size cannot be met.
In order to achieve the above object, a first aspect of the present invention provides a multi-chip cascaded capacitive touch screen driving system, including: each touch control chip is connected with one touch control area, and all the touch control areas are combined to form a complete touch control screen; each touch chip is used for processing touch signals of the corresponding connected touch areas; the plurality of touch control chips are parallelly accessed to a main control chip, and the working state of each touch control chip is coordinated and controlled by the main control chip.
Optionally, the system includes 4 touch chips and 4 corresponding touch areas.
Optionally, each touch chip outputs a group of excitation signal channels and is connected to a group of receiving channels; the excitation signal channel and the receiving channel of each touch chip are connected with the corresponding touch area; and each two touch control chips multiplex one group of receiving channels.
Optionally, an alternative analog switch is connected to an excitation signal channel of each two touch control chips, and the alternative analog switch is in communication connection with the main control chip; and the main control chip is used for controlling the alternative output control of the excitation signal by controlling the alternative analog switch.
Optionally, after the excitation signal channels of every two touch chips are connected to an alternative analog switch, a group of excitation signal channels is multiplexed at the output end of the switch.
Optionally, the main control chip is connected to each touch chip through an I2C interface.
The second aspect of the present invention provides a method for driving a multi-chip cascaded capacitive touch screen, the method being implemented based on the multi-chip cascaded capacitive touch screen driving system of the present invention, the method comprising: each touch control chip receives a rising edge signal from the main control chip at intervals of a preset interval time and starts to output an excitation signal based on the rising edge signal; each touch chip scans a touch signal of a corresponding touch area based on the excitation signal and a preset working sequence; each touch control chip collects and transmits the touch signals obtained by scanning to the main control chip; and the main control chip integrates and obtains coordinate position information of the whole touch screen according to the touch signals of the touch chips and transmits the coordinate position information to the upper computer.
Optionally, each touch chip scans a touch signal of a corresponding touch area based on the excitation signal and a preset working sequence, including: the on-off state of the alternative analog switch is controlled by the main control chip, which comprises the following steps: the main control chip generates two enable control signals, namely an enable control signal I and an enable control signal II, and is used for controlling each two-out-of-one analog switch to alternately work at preset switch intervals: when the first enable control signal is in a low level, a first analog switch of the alternative analog switch starts to work; when the first enable control signal is in a high level, the first analog switch of the alternative analog switch stops working; when the second enable control signal is in a low level, a second analog switch of the two-out-of-one analog switch starts to work; when the second enable control signal is in a high level, the second analog switch of the alternative analog switch stops working.
Optionally, the controlling the on-off state of the alternative analog switch by the main control chip further includes: the master control chip generates two gating signals for controlling the gating condition of an excitation signal channel of each one-out-of-two analog switch; and respectively and correspondingly controlling the two touch control chips connected with each two-out-of-one analog switch to be switched on or switched off according to the high level or the low level of the gating signal.
In another aspect, the present invention provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to execute the above-mentioned multi-chip cascaded capacitive touch screen driving method.
According to the technical scheme, the plurality of touch control chips are cascaded to expand the number of the driving lines, the independent main control chip is arranged to uniformly control the working modes of the plurality of touch control chips, meanwhile, a whole large-size touch control screen is divided into the corresponding number of areas with the same size, each chip is distributed with one respective area, and the touch screens in the areas where the chips are located are scanned. Because the large-size touch screen is divided into a plurality of small areas to be distributed to the corresponding touch chips, and each chip manages the respective area, the scanning workload of each touch chip is greatly reduced, and the touch signal data of the respective areas are transmitted to the main control chip by the plurality of touch chips to be integrated and combined into a whole area.
According to the scheme of the invention, the touch response time is not influenced on the premise that the driving channel of the touch chip meets the driving requirement of the large-size touch screen.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a system structure diagram of a multi-chip cascaded capacitive touch screen driving system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a method for driving a multi-chip cascaded capacitive touch panel according to an embodiment of the present invention;
FIG. 3 is a timing diagram of control signals provided in accordance with one embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The existing capacitive touch screen has the technical advantages of supporting multi-point touch, being sensitive in response and the like, can completely replace a resistive touch screen, and is widely applied to different fields. Along with the increasing demand of the market on the capacitive touch screen, the size requirement of the touch screen is also increased continuously, and in order to meet the technical demand of realizing the airborne domestic large-size capacitive touch screen, the patent provides a method for realizing driving of the large-size capacitive touch screen by cascading a plurality of touch chips. Since the number of channels of one domestic capacitive touch chip in the market cannot meet the requirement of driving a large-size capacitive touch screen, the driving line number can be effectively expanded by cascading a plurality of domestic touch chips. One of the technical difficulties faced by multi-chip driving is the control of working time sequences among a plurality of chips, and therefore, an independent main control chip MCU is needed to uniformly control the working modes of the plurality of touch control chips, meanwhile, a whole large-size touch control screen is divided into a plurality of areas with the same size, each chip is allocated with a respective area, and the touch screen in the respective area is scanned. The large-size touch screen is divided into a plurality of small areas to be distributed to a plurality of touch chips, each chip manages the respective area, so that the scanning workload of each touch chip is greatly reduced, and the multi-touch chips transmit the touch signal data of the respective areas to the MCU for integration processing and are combined into a whole area.
Fig. 1 is a system structure diagram of a multi-chip cascaded capacitive touch screen driving system according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides a multi-chip cascaded capacitive touch screen driving system, where the system includes:
each touch control chip is connected with one touch control area, and all the touch control areas are combined to form a complete touch control screen; each touch chip is used for processing touch signals of the corresponding connected touch areas; the plurality of touch control chips are accessed to a main control chip in parallel; the main control chip is used for coordinating and controlling the working state of each touch control chip.
In one possible implementation, the touch screen Sensor excitation signal channels (TX) and receive channels (RX) are equally distributed across the four touch chips A, B, C, D, with the touch screen Sensor receive channels RX being equally divided into two portions. The RX channels of the areas 1 and 2 are connected to the touch chips a and B, and RX1 and RX2 are short-circuited and multiplexed as shown in fig. 1. The RX channels of the areas 3 and 4 are connected to the touch chips C and D, and RX3 and RX4 are short-circuited and multiplexed as shown in fig. 1. The touch screen sensor excitation signal channel TX is also divided into two parts, namely, areas 1 and 3 are connected to the touch chips A and C, areas 2 and 4 are connected to the touch chips B and D, and excitation signals can be influenced if direct short circuit exists between excitation signal lines, so that the excitation signals of TX1 and TX3 and TX2 and TX4 are switched to be added with an alternative analog switch. The gating control signal is sent by the MCU to control the alternative analog switch, so that excitation signals TX1-TX 4 of the four touch chips work alternately in sequence to output the excitation signals, and interference influence cannot be generated among the excitation signals.
Preferably, the system comprises 4 touch chips and 4 corresponding touch areas.
In the embodiment of the invention, theoretically, the more the touch chips are, the higher the processing efficiency of each area of the touch screen is. However, the more the number of touch chips is, the more loaded timing control method is required, so that the failure rate is greatly increased. Due to the sequential control characteristic of each touch chip, if the number of the touch chips is increased infinitely, the touch delay is increased more and more, so that the use experience of a user is reduced. Finally, the number of touch chips is infinitely increased, and more installation space of the touch chips is needed, so that the size of the device is increased, which is contrary to the current law of convenient device development. Therefore, in order to avoid the above situation, it is preferable that the number of the touch chips is selected to be 4, and the touch screen is correspondingly divided into 4 areas. The upgraded device has response timeliness, convenience and low fault performance. For example, a cascade system is formed by four localization touch chips A, B, C, D and another single main control chip MCU. A whole large-size capacitive touch screen is divided into four areas with equal sizes, the four areas are respectively distributed to four touch control chips, and each chip is responsible for a quarter area. The four touch control chips are uniformly controlled by the MCU, the MCU sends control signals to the four chips to control the work of each touch control chip, and the four touch control chips work alternately under the control of the MCU. The four touch control chips transmit the touch signal data scanned in respective areas to the MCU through the I2C interface, the MCU performs integration processing and combines the touch signal data to obtain touch coordinate position data of the whole touch screen and transmits the touch coordinate position data to the upper computer, and the touch signal data can be checked and subjected to touch scribing debugging through upper computer debugging software.
Preferably, each touch chip outputs a group of excitation signal channels and is connected to a group of receiving channels; the excitation signal channel and the receiving channel of each touch chip are connected with the corresponding touch area; and each two touch control chips multiplex one group of receiving channels.
Specifically, because there are four touch chips in the present method, the chip connection circuit and the chip mounting position have great examination for the conventional touch screen device. The size of the existing touch screen device cannot be increased wirelessly while the number of loops of the number of chips is increased. Along with the degree of intellectualization deepens, on the premise of pursuing convenience and comprehensive control, the self volume and the weight of device need be littleer and smaller on the contrary, and the device is lightly more and more received people's attention. Therefore, based on the timing control characteristics of the four touch chips, it is preferable that one receiving channel is multiplexed every two touch chips. The number of the circuit channels can be reduced, the circuit usage is saved, the circuit is simplified, the space of the device is saved, and the phenomenon that the user experience degree is reduced due to overlarge size of the device is avoided.
Preferably, an alternative analog switch is connected to an excitation signal channel of every two touch control chips, and the alternative analog switch is in communication connection with the main control chip; and the main control chip is used for controlling the alternative output control of the excitation signal by controlling the alternative analog switch.
In the embodiment of the invention, in order to simplify the control loop and reduce the use of the circuit, the excitation signals are alternately sent when the excitation signals are sent according to the time sequence control performance of each touch chip, and only one touch chip works in the circuit. And arranging an alternative analog switch at the excitation signal output ends of every two touch control chips. When the excitation signal of one touch chip is gated, the excitation signal path of the other touch chip is closed. In order to improve the use efficiency of the circuit, the gating circuit is determined by arranging an alternative-or-alternative analog switch, so that the work control of two touch control chips is realized through one circuit while only one touch control chip signal is transmitted by the circuit at the same time.
Preferably, after the excitation signal channels of every two touch chips are connected to an alternative analog switch, one signal excitation channel is multiplexed at the output end of the switch.
In the embodiment of the invention, similar to the receiving channel, after every two touch chips pass through the alternative analog switch, a signal excitation channel is multiplexed at the output end of the switch. The two-out analog switch is controlled by the gating control signal sent by the MCU, so that two touch control chips on one analog switch alternately output excitation signals, and mutual interference influence cannot be generated.
Preferably, the main control chip is connected with each touch chip through an I2C interface.
In the embodiment of the invention, because one master control chip corresponds to a plurality of touch control chips, the master device and the slave device required by the I2C bus communication are adapted. In I2C bus communications, a master device is used to initiate a bus transfer of data and generate a clock to open up the transferred devices, when any addressed device is considered a slave device. The I2C bus communication has obvious simplicity and effectiveness, which is just matched with the effect required by the scheme of the invention, namely, the signal transmission unicity is ensured, the mutual interference of touch chips is avoided, and the device failure rate is reduced due to the simplicity.
Fig. 2 is a flowchart of a method for driving a multi-chip cascaded capacitive touch screen according to an embodiment of the present invention. As shown in fig. 2, an embodiment of the present invention provides a method for driving a multi-chip cascaded capacitive touch panel, where the method includes:
step S10: each touch chip receives a rising edge signal from the main control chip at preset interval time and starts to output an excitation signal based on the rising edge signal.
Specifically, the four touch chips A, B, C, D all operate under the control of the MCU. An IO port (GPIO 1-GPIO 4) is connected to the MCU chip on each of the four touch control chips, the MCU chip provides a rising edge enabling control signal with a preferred interval of 20ms for each chip at preset interval time (preferably 5ms), and the IO port of the touch control chip starts to output an excitation signal and scan capacitance touch signals of respective areas when receiving the rising edge signal.
Step S20: and each touch control chip starts to scan the touch signals of the corresponding touch control area based on the excitation signals and a preset working sequence.
Specifically, the four touch chips A, B, C, D work alternately in sequence in the order of A-C-B-D under the coordinated control of the MCU. The specific working sequence is related to the state control of the alternative analog switch, and the alternative analog switch state is executed by the main control chip. The specific execution rule is that the main control chip generates two enabling control signals for controlling each alternative analog switch to alternately work at intervals of preset switching time; when the first enable control signal is in a low level, the first analog switch starts to work; when the first enable control signal is in a high level, the first analog switch stops working; when the second enable control signal is in a low level, the second analog switch starts to work; when the second enable control signal is in a high level, the second analog switch stops working.
In a possible embodiment, as shown in fig. 3, the MCU controls two-out analog switches K1 and K2, the MCU outputs enable control signals EN1 and EN2 control the two-out analog switches K1 and K2 to alternately operate every 10ms, when EN1 is low, the two-out analog switch K1 starts to operate, when EN1 is high, the two-out analog switch K2 starts to operate, when EN2 is low, the two-out analog switch K2 stops operating, and as shown in the waveform diagram of EN signals in fig. 3, the EN1 and EN2 are opposite to realize the two-out analog switches K1 and K2 to alternately operate every 10 ms.
Meanwhile, as shown in fig. 3, the MCU outputs a gating signal 1 and a gating signal 2 to the two-out-of-one analog switches, respectively, and when the gating signal 1 is low, the excitation signal channel TX1 of the touch chip a turns on the output excitation signal. When the strobe signal 1 is high, the excitation signal channel TX3 of the touch chip C turns on the output excitation signal. When the strobe signal 2 is low, the excitation signal channel TX2 of the touch chip B turns on the output excitation signal. When the strobe signal 2 is high, the excitation signal channel TX4 of the touch chip D turns on the output excitation signal. The four touch chips alternately output excitation signals in sequence according to the sequence of TX1-TX3-TX2-TX4 in the whole working period under the control of an enable signal EN and a gating signal output by the MCU.
Step S30: and each touch control chip collects and transmits the touch signals obtained by scanning to the main control chip.
Specifically, the four touch control chips sequentially work under the control of the MCU, respectively scan touch screen capacitive touch signals in respective areas, and respectively transmit the scanned touch signal data in the four areas to the MCU through the I2C interface.
Specifically, the main control chip integrates and obtains coordinate position information of the whole touch screen according to touch signals of the touch chips, and transmits the coordinate position information to the upper computer.
Specifically, MCU carries out the final integration with the touch data in four regions and handles the coordinate position information that merges into a monoblock region, gives the host computer with coordinate position information transmission, can look over the touch signal data in each region through host computer debugging software to carry out the setting-out test, make things convenient for the capacitive touch screen to overhaul the debugging when breaking down.
In the embodiment of the invention, a large-size capacitive touch screen is uniformly divided into 4 areas with the same size, the four areas are distributed to four touch chips for cascade driving, and each touch chip is responsible for the respective area. According to the method, the four touch chips do not need to be connected in an interactive mode, so that the time sequence synchronization problem of the four chips does not need to be considered, the difficult problem of unified time sequence in the cascade operation is effectively solved, meanwhile, the four touch chips only need to be unified to coordinate and work in sequence under the control of the MCU, only one of the four touch chips is needed to send excitation signals and scan touch signal data in the whole scanning period, the problem of interference among different touch chips in the cascade operation is solved, and the system is enabled to run more stably. The four touch control chips only need to transmit the touch signal data scanned by the respective areas to the MCU, so that the touch response time of the touch control chips is not influenced, and the consumption of internal resources occupied by each touch control chip is reduced. The MCU is mainly used for integrating the touch signal data of the four regions, so that the touch response time is not greatly influenced, and the touch response time of the touch screen is ensured to meet the touch requirement.
The embodiment of the invention also provides a computer-readable storage medium, wherein the computer-readable storage medium is stored with instructions, and when the instructions are run on a computer, the computer is enabled to execute the multi-chip cascaded capacitive touch screen driving method.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A multi-chip cascaded capacitive touch screen driving system is characterized by comprising:
each touch control chip is connected with one touch control area, and all the touch control areas are combined to form a complete touch control screen; each touch chip is used for processing touch signals of the corresponding connected touch areas;
the plurality of touch control chips are parallelly accessed to a main control chip, and the working state of each touch control chip is coordinated and controlled by the main control chip.
2. The system of claim 1, wherein the system comprises 4 touch chips and corresponding 4 touch areas.
3. The system of claim 2, wherein each touch chip outputs a set of excitation signal channels and accesses a set of receive channels;
the excitation signal channel and the receiving channel of each touch chip are connected with the corresponding touch area;
and each two touch control chips multiplex one group of receiving channels.
4. The system of claim 2, wherein an alternative analog switch is connected to the excitation signal channel of every two touch chips, and the alternative analog switch is in communication connection with the main control chip;
and the main control chip is used for controlling the alternative output control of the excitation signal by controlling the alternative analog switch.
5. The system of claim 4, wherein after the excitation signal channels of every two touch chips are connected to an alternative analog switch, a group of excitation signal channels is multiplexed at the output end of the switch.
6. The system of claim 1, wherein the main control chip is connected to each touch chip via an I2C interface.
7. A multi-chip cascaded capacitive touch screen driving method is realized based on the multi-chip cascaded capacitive touch screen driving system of any one of claims 1 to 6, and the method comprises the following steps:
each touch control chip receives a rising edge signal from the main control chip at intervals of a preset interval time and starts to output an excitation signal based on the rising edge signal;
each touch chip scans a touch signal of a corresponding touch area based on the excitation signal and a preset working sequence;
each touch control chip collects and transmits the touch signals obtained by scanning to the main control chip;
and the main control chip integrates and obtains coordinate position information of the whole touch screen according to the touch signals of the touch chips and transmits the coordinate position information to the upper computer.
8. The method of claim 7, wherein the scanning of the touch signal of the corresponding touch area by each touch chip based on the excitation signal and a preset working sequence comprises:
the on-off state of the alternative analog switch is controlled by the main control chip, which comprises the following steps:
the main control chip generates two enable control signals, namely an enable control signal I and an enable control signal II, and is used for controlling each two-out-of-one analog switch to alternately work at preset switch intervals:
when the first enable control signal is in a low level, a first analog switch of the alternative analog switch starts to work;
when the first enable control signal is in a high level, the first analog switch of the alternative analog switch stops working;
when the second enable control signal is in a low level, a second analog switch of the two-out-of-one analog switch starts to work;
when the second enable control signal is in a high level, the second analog switch of the alternative analog switch stops working.
9. The system of claim 8, wherein the master control chip controls the on/off state of the alternative analog switch, further comprising:
the master control chip generates two gating signals for controlling the gating condition of an excitation signal channel of each one-out-of-two analog switch;
and respectively and correspondingly controlling the two touch control chips connected with each two-out-of-one analog switch to be switched on or switched off according to the high level or the low level of the gating signal.
10. A computer readable storage medium having stored thereon instructions which, when run on a computer, cause the computer to perform the multi-chip cascaded capacitive touch screen driving method of any one of claims 7-9.
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