CN103631452B - Scanning control device, controller and control method of infrared touch screen - Google Patents
Scanning control device, controller and control method of infrared touch screen Download PDFInfo
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Abstract
A clock signal is received through a DMA controller, a data set in a data list is sequentially acquired from a memory device in a DMA mode according to the clock signal and sent to a data register, and the data set is temporarily stored through the data register. And the IO module is adjusted to be high level or low level according to the data group. The DMA controller sequentially acquires the data groups in a DMA mode to control the IO module to be adjusted to be in a high level or a low level, so that the scanning control signal line generates ordered and continuous signals to scan, the controller does not need to be controlled by software instructions, other software operations such as touch point coordinate calculation and the like can be performed by the controller in the scanning process, and the response speed of the infrared touch screen is improved.
Description
Technical field
The present invention relates to Infrared touch screen technology field, more particularly to a kind of scan controller of infrared touch panel,
Controller and control method.
Background technology
Infrared touch panel is to be respectively mounted infrared transmitting tube and infrared receiving tube on two groups of opposite side of screen frame, passes through
The touch screen to acquire touch point coordinate position for the break-make of the infrared tube light path on two groups of opposite side.
Each infrared transmitting tube lighted in proper order by the controller of infrared touch panel, and detects that corresponding infrared receiving tube can connect
Received how many infrared lights（Light infrared transmitting tube successively and detect the operation referred to as scanning of infrared receiving tube）.Scan through one
After cycle, controller calculates touch point according to the circumstance of occlusion of each light.
The controller of traditional infrared touch panel, carries out addressing by software instruction to infrared transmitting tube array, to infrared
Reception pipe array carries out addressing, lights infrared transmitting tube and the signal of collection infrared receiving tube.Because controller is than hardware
Speed of operation is a lot of soon, and in scanning process, the controller most of the time is waiting for hardware and completes operation, and can not participate in it
His computing, after the end of scan, controller calculates and touches point coordinates.Traditional controller makes infrared touch screen response speed low.
Content of the invention
Based on this it is necessary to be directed to the problems referred to above, provide a kind of infrared touch improving infrared touch screen response speed
The scan controller of screen, controller and control method.
A kind of scan controller of infrared touch panel, including internal memory, dma controller, data register and I/O module,
Described internal memory is used for storing default data list, and described data list includes some data sets；Described dma controller connects
Described internal memory data depositor, for according to the clock signal receiving, being obtained successively in described data list with dma mode
A data set and send to described data register；Described data register connects described I/O module, for keeping in described number
According to group；Described I/O module connects scan control signal line, is adjusted to high level or low level according to described data set；Described sweep
Retouch control signal wire and include transmitting tube addressing line, reception pipe addressing line, transmitting tube point bright line and reception pipe signals collecting line.
A kind of scanning monitor of infrared touch panel, including processor, also includes the scan control of above-mentioned infrared touch panel
Device, described internal memory is additionally operable to store the digital signal receiving, and described processor connects described internal memory, for according to described
Digital signal calculates and touches point coordinates.
A kind of scan control method of infrared touch panel, the scan controller based on above-mentioned infrared touch panel is realized,
Comprise the following steps：
By described dma controller receive described clock signal, and according to described digital signal from described internal memory with DMA
Mode obtains the data set in described data list successively and sends to described data register；
Described data set is kept in by described data register；
Described I/O module is adjusted to high level or low level according to described data set.
The scan controller of above-mentioned infrared touch panel, controller and control method, receive clock letter by dma controller
Number, and the data set data list sending is obtained from internal memory successively with dma mode according to clock signal post to data
Storage, by data register temporal data group.I/O module is adjusted to high level or low level according to data set.Due to DMA
Controller obtains data set successively with dma mode and controls I/O module to be adjusted to high level or low level, makes scan control signal line
Produce orderly and continuous signal to be scanned, controlled by software instruction without using controller, in the process being scanned
Middle controller can carry out calculating the other software computings such as touch point coordinates, improves the response speed of infrared touch panel.
Brief description
Fig. 1 is the structure chart of the scan controller of an embodiment mid-infrared touch screen；
Fig. 2 is the pin set structure chart of I/O module in an embodiment；
Fig. 3 is the structure chart of the scan controller of another embodiment mid-infrared touch screen；
Fig. 4 is the flow chart of the scan control method of scan controller of an embodiment mid-infrared touch screen；
Fig. 5 is the flow chart of the scan control method of scan controller of another embodiment mid-infrared touch screen.
Specific embodiment
Understandable for enabling the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.Elaborate a lot of details in order to fully understand this in the following description
Bright.But the present invention can be much to implement different from alternate manner described here, and those skilled in the art can be not
Similar improvement is done, therefore the present invention is not limited by following public specific embodiment in the case of running counter to intension of the present invention.
Unless otherwise defined, all of technology used herein and scientific terminology and the technical field belonging to the present invention
The implication that technical staff is generally understood that is identical.The term being used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body is it is not intended that in limiting the present invention.Term as used herein " and/or " include one or more phases
The arbitrary and all of combination of the Listed Items closing.
A kind of scan controller of infrared touch panel, as shown in figure 1, include internal memory 110, DMA（Direct
Memory Access, direct memory access）Controller 120, data register 130 and IO（Input/Output, input and output）
Module 140.
Internal memory 110 is used for storing default data list, and data list includes some data sets.Every in scanning process
The state of each pin of one moment I/O module 140 can be expressed with 1 or several bytes, will express synchronization IO
Several data sets, as a data set, are carried out arrangement form by the data of the pin state of module 140 sequentially in time
Data list.
Dma controller 120 connects internal memory 110 data depositor 130, for according to the clock signal receiving, with DMA
Mode obtains the data set in data list successively and sends to data register 130.Number is obtained successively according to clock signal
According to group, be to control dma controller 120 to work obtaining data set using clock signal, dma controller 120 can be when
Clock signal is in work or the work when clock signal is in low level, rising edge or trailing edge during high level, also may be used
All to work when clock signal is in rising edge with trailing edge two states, specifically can according to circumstances be adjusted.With DMA control
As a example device 120 processed works when clock signal is in high level, when dma controller 120 receives first high level, obtain
First data set in data list sends to data register 130.Dma controller 120 is receiving second high level
When, obtain second data set in data list and send to data register 130, by that analogy, up to the end of scan.DMA
Controller 120 obtains data set with dma mode and sends to data register 130, passes through software instruction without using controller
Control.
Data register 130 connects I/O module 140, for keeping in the data set of dma controller 120 transmission, temporary is
Refer to data register 130 when receiving new data set, stored in the form of covering former data set.
I/O module 140 connects scan control signal line, is adjusted to high level or low level according to data set.
Scan control signal line includes transmitting tube addressing line, reception pipe addressing line, transmitting tube point bright line and reception pipe signal
Gathering line.Wherein, transmitting tube addressing line is used for transmitting infrared transmitting tube address signals, and reception pipe addressing line is used for transmitting infrared connecing
Closed tube address signals, transmitting tube point bright line is used for transmitting infrared transmitting tube luminous signal, and reception pipe signals collecting line is used for transmitting
The Continuity signal of infrared receiving tube.Specifically, the pin of I/O module 140 connects each scan control signal line, I/O module 140 respectively
Adjusting corresponding pin according to data set is high level or low level, makes scan control signal line produce orderly and continuous signal
It is scanned.
Operate the I/O module 140 connecting scan control signal line in scanning process using dma controller 120, corresponding
Specific signal is produced on scan control signal line, thus realizing the control scanning.
Wherein in an embodiment, I/O module 140 includes several pin set, the quantity of data register 130 with draw
The quantity of foot group is identical and is connected respectively.Same pin set connects scan control signal line, and is deposited by corresponding data
Device 130 is connected with dma controller 120.As shown in Fig. 2 a pin set of I/O module 140 includes pin PB0 to pin PB7, its
Middle pin PB0, PB1 and PB2 are used for connecting transmitting tube addressing line, and pin PB3 is used for connecting transmitting tube point bright line, and pin PB4 uses
In connecting reception pipe signals collecting line, pin PB5, pin PB6 and pin PB7 are used for connecting reception pipe addressing line.It is appreciated that
The quantity of pin can be adjusted according to scan control signal line, and the concrete annexation of pin and scan control signal line is also simultaneously
It is not unique.In addition, the pin number of pin set also can be more than the quantity of scan control signal line, but need to draw unnecessary
Foot is hanging, it is to avoid dma controller 120 transmission data group is impacted.
So that scan control signal line number amount is 8 as a example, data list includes n data set, and each data set includes 8
Data, being respectively used to adjust corresponding pin in pin set is high level or low level.Here represents high level with data " 1 ", number
Represent low level according to " 0 ", the data in first data set Data1 is B11001010（B represents binary number）, then DMA control
Device 120, in first time transmission data group, data set Data1 is sent to data register 130, the m in data set Data1
The numerical value of position directly affects m-th pin in pin set.It is appreciated that in other embodiments or with data " 1 " table
Show low level, data " 0 " represents high level.
When carrying out a dma operation transmission data group, transmission width is more than or equal in pin set dma controller 120
Memory headroom size shared by all pins is it is ensured that the complete transmission of data.Such as pin set includes 16 pins, each pin
Take 1 memory headroom, all pins of pin set take 2 bytes altogether（16）Memory headroom, then dma controller 120 enter
The data width of dma operation of row is more than 2 bytes or is equal to 2 bytes.
It is that scan control signal line is connected with same pin set in the present embodiment, because same pin set shares one
Data register 130, a complete data set can be sent directly to corresponding data depositor 130 by dma controller 120, letter
Change design, and be easy to wired for management.
In other embodiments, also scan control signal line can be connected different pin set respectively, to connect two pins
As a example group, then need to send the corresponding data in data set to corresponding data register respectively using two dma controllers 120
Device 130.As pin set connects transmitting tube addressing line and transmitting tube point bright line, then utilize a dma controller 120 by data set
The middle data transfer controlling transmitting tube addressing and transmitting tube to light is to the data register 130 being connected with this pin set.
The scan controller of above-mentioned infrared touch panel, receives clock signal by dma controller 120, and according to clock
Signal obtains the data set data list from internal memory 110 successively with dma mode and sends to data register 130, leads to
Cross data register 130 temporal data group.I/O module 140 is adjusted to high level or low level according to data set.Due to DMA control
Device 120 processed obtains data set successively with dma mode and controls I/O module 140 to be adjusted to high level or low level, so that scan control is believed
Number line produces orderly and continuous signal and is scanned, and is controlled by software instruction without using controller, be scanned
During controller can carry out calculating and touch the other software computing such as point coordinates, improve the response speed of infrared touch panel.
Wherein in an embodiment, as shown in figure 3, the scan controller of infrared touch panel may also include analog digital conversion
Device 150, analog-digital converter 150 connects I/O module 140, and connects internal memory 110.Analog-digital converter 150 is according to the clock receiving
Signal, carries out analog digital conversion and obtains digital signal to the signal of reception pipe signals collecting line transmission, and sends and deposit to internal memory 110
Storage, calculates for controller and touches point coordinates.Analog-digital converter 150 and dma controller 120 can be controlled using same clock signal,
And control mode is identical, such as work all when clock signal is in high level, dma controller 120 transmits a data set, modulus
Transducer 150 carries out an analog digital conversion, realizes scan control and the work of signal conversion is synchronous, improve the accurate of signals collecting
Property.
It is appreciated that in other embodiments, the scan controller of infrared touch panel also may not include analog-digital converter
150, but carry out analog digital conversion using the signal of outside analog digital conversion equipment interconnection closed tube signals collecting line transmission.Can also be
Reception pipe signals collecting line is passed through outside analog digital conversion equipment be connected with I/O module 140, I/O module 140 directly receives numeral letter
Number.
Wherein in an embodiment, with continued reference to Fig. 3, the scan controller of infrared touch panel includes analog-digital converter
150, may also include the intervalometer 160 connecting dma controller 120, intervalometer 160 is used for tranmitting data register signal to dma controller
120.Intervalometer 160 also can connect analog-digital converter 150, be dma controller 120 and analog-digital converter 150 offer clock simultaneously
Signal, realizes scan control and the work of signal conversion is synchronous.
It is appreciated that in other embodiments, the scan controller of infrared touch panel also may not include intervalometer 160.
By outer clock circuit be dma controller 120 and analog-digital converter 150 provides clock signal.
A kind of scanning monitor of infrared touch panel, including processor, also includes the scan control of above-mentioned infrared touch panel
Device, internal memory 110 is used for the digital signal that storage receives, and processor connects internal memory 110, for being calculated according to digital signal
Touch point coordinates.
Control I/O module to be adjusted to high level or low level because dma controller obtains data set successively with dma mode, make
Scan control signal line produces orderly and continuous signal and is scanned, and is controlled by software instruction without processor, is carrying out
During scanning, processor can carry out calculating the other software computings such as touch point coordinates, in the premise not increasing external hardware
Under improve the response speed of infrared touch panel.
The present invention also provides a kind of scan control method of infrared touch panel, the scan control based on above-mentioned infrared touch panel
Realize on device, as described in Figure 4, comprise the following steps：
Step S120：By dma controller receive clock signal, and according to clock signal from internal memory with dma mode according to
A data set in secondary acquisition data list simultaneously sends to data register.
The state of each moment each pin of I/O module in scanning process can carry out table with 1 or several bytes
Reach, using the data of the pin state of expression synchronization I/O module as a data set, sequentially in time by some numbers
Carry out arrangement form data list according to group.
Data set is obtained successively according to clock signal, is to control dma controller to work to obtain number using clock signal
According to group, dma controller can be when clock signal is in high level work or clock signal be in low level,
When rising edge or trailing edge, work is it is also possible to all work when clock signal is in rising edge with trailing edge two states, specifically
Can according to circumstances be adjusted.So that dma controller works when clock signal is in high level as a example, when dma controller receives
During to first high level, first data set obtaining in data list sends to data register.Dma controller is receiving
During to second high level, second data set obtaining in data list sends to data register, by that analogy, until sweeping
Retouch end.Data set is obtained with dma mode by dma controller and sends to data register, pass through without using controller
Software instruction controls.
Step S130：By data register temporal data group.
Temporary is to refer to data register when receiving new data set, is deposited in the form of covering former data set
Storage.
Step S140：I/O module is adjusted to high level or low level according to data set.
Specifically, the pin of I/O module connects each scan control signal line respectively, and I/O module adjusts according to data set and corresponds to
Pin is high level or low level, makes scan control signal line produce orderly and continuous signal and is scanned.
Operate the I/O module connecting scan control signal line in scanning process using dma controller, in corresponding scanning control
Specific signal is produced on holding wire processed, thus realizing the control scanning.
Wherein in an embodiment, I/O module 140 includes several pin set, the quantity of data register 130 with draw
The quantity of foot group is identical and is connected respectively.Same pin set connects scan control signal line, and is deposited by corresponding data
Device is connected with dma controller.
It is that scan control signal line is connected with same pin set in the present embodiment, because same pin set shares one
Data register, a complete data set can be sent directly to corresponding data depositor by dma controller, simplify design,
And it is easy to wired for management.
In other embodiments, also scan control signal line can be connected different pin set respectively, to connect two pins
As a example group, then need to send the corresponding data in data set to corresponding data register respectively using two dma controllers.
The scan control method of above-mentioned infrared touch panel, receives clock signal by dma controller, and according to clock signal
From internal memory, the data set data list is obtained successively with dma mode and send to data register, by data register
Device temporal data group.I/O module is adjusted to high level or low level according to data set.Due to dma controller with dma mode according to
Secondary acquisition data set controls I/O module to be adjusted to high level or low level, so that scan control signal line is produced and believes in order and continuously
Number it is scanned, controlled by software instruction without using controller, controller can be calculated during being scanned
Touch the other software computings such as point coordinates, improve the response speed of infrared touch panel.
Wherein in an embodiment, as shown in figure 5, after step S140, can also include the steps of：
Step S150：Clock signal is received by analog-digital converter, and according to clock signal to reception pipe signals collecting line
The signal of transmission carries out analog digital conversion and obtains digital signal, and sends to internal memory storage.
The signal that analog-digital converter transmits to reception pipe signals collecting line carries out analog digital conversion and obtains digital signal, for supplying
Controller calculates and touches point coordinates.Analog-digital converter and dma controller can be controlled using same clock signal, and control mode phase
With, such as work all when clock signal is in high level, dma controller transmission one data set, analog-digital converter is carried out once
Analog digital conversion, realizes scan control and the work of signal conversion is synchronous, improves scanning accuracy.
It is appreciated that in other embodiments, it is possible with outside analog digital conversion equipment interconnection closed tube signals collecting line and passes
Defeated signal carries out analog digital conversion, obtains digital signal and sends to internal memory storage.Can also be by reception pipe signals collecting
Line is passed through outside analog digital conversion equipment and is connected with I/O module, and I/O module directly receives digital signal.
Wherein in an embodiment, with continued reference to Fig. 5, before step S120, can also include the steps of：
Step S110：By intervalometer tranmitting data register signal to dma controller.
There is provided clock signal using intervalometer for dma controller, being also with intervalometer in the present embodiment is analog digital conversion
Device provides clock signal, realizes scan control and the work of signal conversion is synchronous.
It is appreciated that in other embodiments, can be also dma controller by outer clock circuit and analog-digital converter carries
For clock signal.
Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (8)
1. a kind of scan controller of infrared touch panel is it is characterised in that include internal memory, dma controller, data register
And I/O module,
Described internal memory is used for storing default data list, and described data list includes some data sets；
Described dma controller connects described internal memory data depositor, for according to the clock signal receiving, in described clock
Signal is in high level, low level, rising edge or trailing edge or when described clock signal is in rising edge and trailing edge, from
Described internal memory obtains the data set in described data list successively with dma mode and sends to described data register；
Described data register connects described I/O module, for keeping in described data set；
Described I/O module connects scan control signal line, is adjusted to high level or low level according to described data set；Described sweep
Retouch control signal wire and include transmitting tube addressing line, reception pipe addressing line, transmitting tube point bright line and reception pipe signals collecting line.
If 2. the scan controller of infrared touch panel according to claim 1 is it is characterised in that described I/O module includes
Dry pin set, the quantity of described data register is identical with the quantity of described pin set and is connected respectively, same pin
Group connects described scan control signal line, and is connected with described dma controller by corresponding data depositor.
3. the scan controller of infrared touch panel according to claim 1 is it is characterised in that also include analog digital conversion
Device, described analog-digital converter connects described I/O module, and connects described internal memory, and described analog-digital converter is according to receive
Clock signal, the signal that described reception pipe signals collecting line is transmitted carries out analog digital conversion and obtains digital signal, and sends to institute
State internal memory storage.
4. the scan controller of infrared touch panel according to claim 1 is it is characterised in that also include described in connection
The intervalometer of dma controller, described intervalometer is used for sending described clock signal to described dma controller.
5. a kind of scanning monitor of infrared touch panel, it is characterised in that including processor, also includes Claims 1-4 such as and appoints
The scan controller of the infrared touch panel described in meaning one, described internal memory is additionally operable to store the digital signal receiving, described
Processor connects described internal memory, touches point coordinates for calculating according to described digital signal.
6. a kind of scan control method of infrared touch panel, the sweeping of the infrared touch panel as described in Claims 1-4 any one
Retouch and realize it is characterised in that comprising the following steps on control device：
Described clock signal is received by described dma controller, and height is in described clock signal according to described clock signal
Level, low level, rising edge or trailing edge or described clock signal be in when rising edge and trailing edge from described internal memory with
Dma mode obtains the data set in described data list successively and sends to described data register；
Described data set is kept in by described data register；
Described I/O module is adjusted to high level or low level according to described data set.
7. a kind of scan control method of infrared touch panel, the scan controller of infrared touch panel as claimed in claim 1
Upper realization is it is characterised in that comprise the following steps：
Described clock signal is received by described dma controller, and height is in described clock signal according to described clock signal
Level, low level, rising edge or trailing edge or described clock signal be in when rising edge and trailing edge from described internal memory with
Dma mode obtains the data set in described data list successively and sends to described data register；
Described data set is kept in by described data register；
Described I/O module is adjusted to high level or low level according to described data set；
Also include analog-digital converter, described analog-digital converter connects described I/O module, and connects described internal memory, and described modulus turns
Parallel operation, according to the described clock signal receiving, carries out analog digital conversion number to the signal of described reception pipe signals collecting line transmission
Word signal, and send to the storage of described internal memory；
After described I/O module is adjusted to high level or low level step according to described data set, further comprising the steps of：
Described clock signal is received by described analog-digital converter, and according to described clock signal to described reception pipe signals collecting
The signal of line transmission carries out analog digital conversion and obtains digital signal, and sends to the storage of described internal memory.
8. a kind of scan control method of infrared touch panel, the scan controller of infrared touch panel as claimed in claim 1
Upper realization is it is characterised in that comprise the following steps：
Described clock signal is received by described dma controller, and height is in described clock signal according to described clock signal
Level, low level, rising edge or trailing edge or described clock signal be in when rising edge and trailing edge from described internal memory with
Dma mode obtains the data set in described data list successively and sends to described data register；
Described data set is kept in by described data register；
Described I/O module is adjusted to high level or low level according to described data set；
Also include analog-digital converter, described analog-digital converter connects described I/O module, and connects described internal memory, and described modulus turns
Parallel operation, according to the described clock signal receiving, carries out analog digital conversion number to the signal of described reception pipe signals collecting line transmission
Word signal, and send to the storage of described internal memory；
Also include connecting the intervalometer of described dma controller, described intervalometer is used for sending described clock signal to described DMA control
Device processed；
Described by described dma controller receive described clock signal, and according to described digital signal from described internal memory with DMA
Mode obtains the data set in described data list successively and sends to before the step of described data register, also include with
Lower step；
Described clock signal is sent to described dma controller by described intervalometer.
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| CN109445639A (en) * | 2018-12-10 | 2019-03-08 | 广州华欣电子科技有限公司 | A kind of infrared scan control method, circuit and electronic equipment |
| CN110568958B (en) * | 2019-08-30 | 2023-06-27 | 国微集团(深圳)有限公司 | Method for scanning touch screen by using intelligent DMA (direct memory access) and touch chip |
| CN116719430B (en) * | 2022-07-28 | 2024-08-09 | 广州众远智慧科技有限公司 | Scanning device of infrared touch screen and infrared touch system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1335548A (en) * | 2000-07-24 | 2002-02-13 | 北京汇冠科技有限公司 | Infrared touch screen performance improving structure and method |
| CN1732449A (en) * | 2002-11-21 | 2006-02-08 | 桑迪士克股份有限公司 | Combination non-volatile memory and input-output card with direct memory access |
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| TWI365400B (en) * | 2007-11-29 | 2012-06-01 | Ibm | Infrared touch screen apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1335548A (en) * | 2000-07-24 | 2002-02-13 | 北京汇冠科技有限公司 | Infrared touch screen performance improving structure and method |
| CN1732449A (en) * | 2002-11-21 | 2006-02-08 | 桑迪士克股份有限公司 | Combination non-volatile memory and input-output card with direct memory access |
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