CN104980186B - Echo interference removing method and relevant apparatus - Google Patents
Echo interference removing method and relevant apparatus Download PDFInfo
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- CN104980186B CN104980186B CN201410133872.5A CN201410133872A CN104980186B CN 104980186 B CN104980186 B CN 104980186B CN 201410133872 A CN201410133872 A CN 201410133872A CN 104980186 B CN104980186 B CN 104980186B
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Abstract
The present invention relates to half-duplex operation technical field, more particularly to a kind of echo interference removing method and device, the method is applied in terminal, when bus driver is switched to reception state by transmission state, the valid data in bus are obtained after the preset duration of interval again, wherein, preset duration is returned the time used more than echo reflection, while less than the response time that valid data are returned in bus；In this way, after terminal has sent data, after being spaced preset duration, the valid data in bus can be just received, the transmission time of echo error code can be avoided, avoid the wrong data that terminal by mistake returns bus reflections as valid data.Moreover, preset duration is limited to the time used of returning more than echo reflection, and it is less than in the range of the response time for returning to valid data in bus, can ensures that the valid data transmitted in bus will not be missed.In conclusion the echo interference in bus can be completely eliminated in the echo interference removing method.
Description
Technical field
The present invention relates to half-duplex operation technical field, more particularly to a kind of echo interference removing method and related dress
Put.
Background technology
Half-duplex transmission mode refer to receive with send share a carrier channel, but synchronization can only send data or
Data can only be received.For example, RS485 serial bus standards are exactly half-duplex transmission mode.Terminal A and terminal B are total by RS485
Line communicates, it is assumed that terminal A first sends data, and the RS485 bus drivers of terminal A sides are first set as transmission state, terminal B
The RS485 bus drivers of side are set as reception state.After terminal A has sent data, the bus driver switching of terminal A sides
Bus driver to reception state, and terminal B sides is switched to transmission state, the data that terminal A receiving terminals B is sent.
Cause impedance discontinuity since the total built-in units of RS485 are more, and bus is long, when RS485 bus drivers
Transmission state when closing, still surviving signal in RS485 buses, when terminal is preparing reception data after having sent data,
The signal retained in RS485 buses can be reflected back, so that terminal receives the data of mistake, that is, generate echo error code.
Eliminating a kind of method of echo error code in the prior art is, using the RS485 industrial sidings of impedance matching, low decay
Cable, the terminal resistance of 120 Ω is connected in the starting end that RS485 is communicated with end, and such a method can only be reduced to greatest extent
The interference of echo error code, can not be completely eliminated the interference of echo error code.
The content of the invention
A kind of echo interference removing method and relevant apparatus are provided in the embodiment of the present invention, half-duplex string is completely eliminated
Echo error code interference on row bus.
In order to realize above-mentioned goal of the invention, the embodiment of the invention discloses following technical solution：
In a first aspect, the present invention provides a kind of echo interference removing method, applied in terminal, including：
When data sending to be sent is complete, controlling bus driver is switched to reception state by transmission state；
Preset duration is spaced since when the bus driver is switched to reception state by transmission state, is controlled described total
Line drive obtains the valid data in bus, wherein, the preset duration is more than echo reflection in bus when returning used
Between, and less than the response time that valid data are returned in bus.
Alternatively, it is described when being spaced default when the bus driver is switched to reception state by transmission state
It is long, control the bus driver to obtain the valid data in bus, including：
When controlling bus driver is switched to reception state by transmission state, start timing；
When timing duration reaches the preset duration, the number in buffer in the bus driver counterpart terminal is emptied
According to receive the valid data in bus.
Alternatively, it is described when being spaced default when the bus driver is switched to reception state by transmission state
It is long, control the bus driver to obtain the valid data in bus, including：
When controlling bus driver is switched to reception state by transmission state, closes and reception shape is switched to by transmission state
The receive capabilities of the corresponding serial ports of bus driver of state, and start timing；
When timing duration reaches the preset duration, the receive capabilities of the serial ports are opened, to receive in bus
Valid data.
Alternatively, after the data in the bus driver counterpart terminal in buffer are emptied, further include：Receive total
The valid data transmitted on line.
Alternatively, the receive capabilities of the serial ports are closed, including：The level state of the reception data terminal of the terminal is turned
Inactive level state is changed to, the inactive level state includes high level or low level.
Second aspect, the present invention also provides a kind of echo interference cancellation element, including：
State switch control unit, for when data sending to be sent is complete, controlling the bus driver by sending
State is switched to reception state；
Acquiring unit, for when being spaced default when the bus driver is switched to reception state by transmission state
It is long, control the bus driver to obtain the valid data in bus, wherein, the preset duration is more than echo reflection in bus
Return the time used, and less than the response time that valid data are returned in bus.
Alternatively, the acquiring unit includes：
First timing unit, for when controlling bus driver is switched to reception state by transmission state, starting timing；
Data empty unit, for when timing duration reaches preset duration, emptying the bus driver counterpart terminal
Data in interior buffer, to receive the valid data transmitted in bus.
Alternatively, the acquiring unit includes：
Closing unit is received, when controlling bus driver is switched to reception state by transmission state, is closed by transmission shape
State is switched to the receive capabilities of the corresponding serial ports of bus driver of reception state；
Second timing unit, for when controlling bus driver is switched to reception state by transmission state, starting timing；
Opening unit is received, for when timing duration reaches preset duration, opening the receive capabilities of the serial ports, so as to
Receive the valid data in bus.
Alternatively, the acquiring unit further includes：Data receipt unit, for when the data empty unit empty it is described
In bus driver counterpart terminal during data in buffer, the valid data transmitted in bus are received.
The third aspect, the present invention also provides a kind of terminal, including：Processor；For storing processor-executable instruction
Memory；Wherein, the processor is configured as：
When data sending to be sent is complete, the bus driver is controlled to be switched to reception state by transmission state；
Preset duration is spaced since when the bus driver is switched to reception state by transmission state, is controlled described total
Line drive obtains the valid data in bus, wherein, the preset duration is more than echo reflection in bus when returning used
Between, and less than the response time that valid data are returned in bus.
By above technical scheme as it can be seen that echo interference removing method provided in an embodiment of the present invention and device, the method
Applied in terminal, when bus driver is switched to reception state by transmission state, bus is obtained again after being spaced preset duration
On valid data, wherein, preset duration is more than echo reflection and returns the time used, while less than returning to significant figure in bus
According to response time；In this way, after terminal has sent data, after being spaced preset duration, the valid data in bus can be just received, i.e.,
The transmission time of echo error code can be avoided, avoids the wrong data that terminal by mistake returns bus reflections as valid data.And
And preset duration is limited to the time used of returning more than echo reflection, and less than the response that valid data are returned in bus
It in the range of time, can ensure that the valid data transmitted in bus will not be missed.In conclusion the echo interference elimination side
The echo interference in bus can be completely eliminated in method.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can also obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow diagram of echo interference removing method provided in an embodiment of the present invention；
Fig. 2 is the flow diagram of another echo interference removing method provided in an embodiment of the present invention；
Fig. 3 is the flow diagram of another echo interference removing method provided in an embodiment of the present invention；
Fig. 4 is a kind of structure diagram of RS485 communication systems example；
Fig. 5 is flow diagram of the embodiment of the present invention based on a kind of Fig. 4 echo interference removing methods provided；
Fig. 6 is flow diagram of the embodiment of the present invention based on Fig. 4 another echo interference removing methods provided；
Fig. 7 is a kind of structure diagram of echo interference cancellation element provided in an embodiment of the present invention；
Fig. 8 is the structure diagram of another echo interference cancellation element provided in an embodiment of the present invention；
Fig. 9 is the structure diagram of another echo interference cancellation element provided in an embodiment of the present invention.
Embodiment
In order to make those skilled in the art more fully understand the technical solution in the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described implementation
Example is only part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this area is common
Technical staff's all other embodiments obtained without making creative work, should all belong to protection of the present invention
Scope.
It is a kind of flow diagram of echo interference removing method provided in an embodiment of the present invention referring to Fig. 1.The method
Terminal is can be applied to, the terminal can be microcontroller or PC machine etc..As shown in Figure 1, it the described method comprises the following steps：
In step s 11, when data sending to be sent is complete, the bus driver is controlled to be switched to by transmission state
Reception state.
When transmitting terminal determines that data sending to be sent is complete, switching drives with the transmission drive end of bus driver and reception
The level state of the I/O ports at end（Low level is switched to from high level；Or it is switched to high level from low level）, realize that control is total
The state switching of line drive.
If the transmission drive end of bus driver is that high level is effective, it is that low level is effective to receive drive end, then works as institute
State I/O ports（That is the P1 ports in Fig. 4）Voltage signal when being changed into low level from high level, bus driver is by transmission state
It is switched to reception state.When the voltage signal of the I/O ports is high level, bus driver is in transmission state；Work as institute
When the voltage signal for stating I/O ports is low level, bus driver is in reception state.
In step s 12, when being spaced default when the bus driver is switched to reception state by transmission state
It is long, the valid data in bus are obtained, wherein, the preset duration is more than echo reflection in bus and returns the time used, and
Less than the response time that valid data are returned in bus.The preset duration is related with the length of transmission line in bus, this area skill
Art personnel can be according to the enlightenment of the application, and the time used of returning to echo reflection in bus in practical application scene surveys
Amount, and the response time to returning to valid data in bus measure, so that suitable preset duration is obtained, specific measurement
Mode the application is not construed as limiting.
Due to half duplex series communication, echo can be just produced when bus driver is switched to reception state by transmission state
Interference, therefore, when detecting bus driver and being switched to reception state by transmission state, it is necessary to take certain measure to avoid connecing
Echo error code on to bus.
The valid data response time is returned since the turn around time of echo error code in bus is less than in bus, can be with
When bus driver is switched to reception state by transmission state, the valid data in bus are obtained after the preset duration of interval, are kept away
Exempt from the echo interference in bus.Wherein, preset duration should return the time used more than echo reflection, while less than in bus
Return to the response time of valid data, wherein, in bus echo reflection time used of returning determined according to bus length.Bus is got over
Long, echo reflection time used of returning is longer；Bus is shorter, and echo reflection time used of returning is shorter.
Alternatively, further included in the bus driver counterpart terminal after the data in its internal buffer are emptied
The step of receiving the valid data transmitted in bus, so as to ensure that the terminal will not miss the valid data in bus.
Echo interference removing method provided in this embodiment, is detecting that bus driver is switched to reception by transmission state
During state, it is spaced after preset duration and obtains valid data in bus again, preset duration is more than echo reflection when returning used
Between.In this way, after terminal has sent data, after being spaced preset duration, the valid data in bus can be just received, so as to avoid
The transmission time of echo error code, avoids the wrong data that terminal by mistake returns bus reflections as valid data.Moreover, when default
It is long to be less than the response time that valid data are returned in bus, can ensure that the valid data transmitted in bus will not be missed.To sum up
Described, the echo interference in bus can be completely eliminated in the echo interference removing method.
In one embodiment of the invention, when bus driver is switched to reception state by transmission state, interval is pre-
If emptying the buffer of terminal after duration, the echo error code received is deleted.
Fig. 2 is referred to, shows another echo interference removing method flow chart provided in an embodiment of the present invention, this method
Applied in terminal.As shown in Fig. 2, the method may include following steps：
S11, when data sending to be sent is complete, controls the bus driver to be switched to reception shape by transmission state
State.
S121, when controlling bus driver is switched to reception state by transmission state, starts timing.
S122, when timing duration reaches preset duration, empties in the bus driver counterpart terminal in buffer
Data, to receive the valid data in bus.The preset duration is more than echo reflection in bus and returns the time used, and
Less than the response time that valid data are returned in bus.
Echo interference removing method provided in this embodiment, reception state is switched in bus driver by transmission state
When, start timing, when timing duration reaches the preset duration, empty the buffer in terminal.Such a mode is bus driver
After device is switched to reception state by transmission state, the serial ports of terminal can receive the data in bus, and be stored in buffer.
When timing duration reaches preset duration, then empty buffer.I.e. terminal first have received echo error code（Wrong data）, Ran Houzai
Delete the echo error code received.Since preset duration is returned the time used much larger than the echo reflection in bus, and it is remote small
In the response time that valid data are returned in bus, therefore, it is possible to the whole echo error codes that will be received（Wrong data）Delete,
And the valid data in bus will not be deleted by mistake.To sum up, the echo interference removing method can be completely eliminated in bus
Echo interference.
In another embodiment of the present invention, after bus driver is switched to reception state by transmission state, first will
The receive capabilities of RS485 serial ports close preset duration in terminal, avoid receiving the echo error code in bus.
Fig. 3 is referred to, shows the flow chart of another echo interference removing method of the embodiment of the present invention, the method should
For terminal.As shown in figure 3, the method may include following steps：
S11, when data sending to be sent is complete, controls the bus driver to be switched to reception shape by transmission state
State.
S123, when controlling bus driver is switched to reception state by transmission state, closes and is switched to by transmission state
The receive capabilities of serial ports in the bus driver counterpart terminal of reception state, and start timing.
For example, terminal A and terminal B are communicated by RS485 buses, after terminal A has sent data, terminal A is corresponding
RS485 bus drivers are switched to reception state by transmission state, at this time, close the receive capabilities of RS485 serial ports on terminal A,
Meanwhile start timing.The receive capabilities of the RS485 serial ports of terminal are closed, will exactly receive data terminal（RxD）Level state cut
Change to inactive level state.It is assumed that it is that high level is effective to receive data terminal, then the level state for receiving data terminal is switched to low
Level state.It is assumed that it is that low level is effective to receive data terminal, then the level state for receiving data terminal is switched to high level shape
State.
S124, when timing duration reaches preset duration, opens the receive capabilities of the serial ports, to receive in bus
Valid data.The preset duration is more than echo reflection in bus and returns the time used, and is less than in bus and returns to significant figure
According to response time.
Examples detailed above is adopted, when timing duration reaches preset duration, opens the receive capabilities of RS485 serial ports on terminal A,
That is terminal A just opens receive capabilities after data have been sent after being spaced preset duration, avoids receiving the echo error code in bus.
Wherein, terminal A is received data terminal（RxD）Level state be converted to significant level state, it is assumed that it is high to receive data terminal
Level is effective, then will receive data terminal and be switched to high level state, can receive the data in bus.
Echo interference removing method provided in this embodiment, reception state is switched in bus driver by transmission state
When, the serial ports receive capabilities in the bus driver counterpart terminal, and timing are first closed, when timing duration reaches preset duration
Afterwards, the serial ports receive capabilities are then turned on, avoid receiving the echo error code in bus.Since preset duration is much larger than in bus
Echo reflection is returned the time used, and much smaller than the response time that valid data are returned in bus, therefore, will not be received
Any echo error code（Wrong data）, and will not miss and receive any valid data in bus.To sum up, the echo interference eliminates
The echo interference in bus can be completely eliminated in method.
In one embodiment of the invention, voltage signal on the I/O port being connected with bus driver by detection terminal
Level state judge the state of bus driver.
Fig. 4 is a kind of structure diagram of RS485 communication systems example.As shown in figure 4, the RS485 communication systems bag
Include terminal A, terminal B, bus driver 1, bus driver 2 and RS485 buses.
The transmission drive end and reception drive end of the I/O ports P1 connections bus driver 1 of wherein terminal A, the hair of terminal A
The input pin of data terminal TXD connections bus driver 1 is sent, terminal A's receives the defeated of data terminal RXD connections bus driver 1
Go out pin, the bus connection pin connection RS485 of bus driver 1.The connection mode of terminal B and bus driver 2 with it is above-mentioned
Mode is identical, and details are not described herein again.
With reference to Fig. 4 and Fig. 5, wherein, Fig. 5 is a kind of flow of echo interference removing method in communication system shown in Fig. 4
Figure, the method are applied in terminal A, and similarly, the method that terminal B eliminates echo interference is identical with the method for terminal A, herein not
Repeat again.
As shown in figure 5, the method may include following steps：
S110, after data to be sent have been sent, controlling bus driver 1 is switched to reception state by transmission state.
In the present embodiment, the transmission drive end of bus driver is that high level is effective, and it is that low level has to receive drive end
Effect, then when the voltage signal of P1 ports is changed into low level from high level, bus driver is switched to reception shape by transmission state
State.
S120, starts timing.Timing can be carried out by timer in terminal, can be countdown or just
Timing, the application contrast are not limited.
S130, when timing duration reaches preset duration, empties in the bus driver counterpart terminal in buffer
Data, to receive the valid data in bus.
Echo interference removing method provided in this embodiment, when the bus driver 1 of terminal A connections is switched by transmission state
During to reception state, and start timing, when timing duration reaches preset duration, empty in the bus driver counterpart terminal
Data in buffer, so as to delete the echo error code in buffer, avoid terminal using echo error code as valid data processing.
Since preset duration is returned the time used much larger than the echo reflection in bus, and much smaller than return valid data in bus
Response time, therefore, it is possible to the whole echo error codes that will be received（Wrong data）Delete, and will not delete by mistake in bus
Valid data.To sum up, the echo interference in bus can be completely eliminated in the echo interference removing method.
With reference to Fig. 4 and Fig. 6, Fig. 6 is the flow chart of another echo interference removing method in communication system shown in Fig. 4,
The method is applied in terminal A, and similarly, the method that terminal B eliminates echo interference is identical with the method for terminal A, herein no longer
Repeat.
S210, after data to be sent have been sent, controlling bus driver 1 is switched to reception state by transmission state.
S220, closes the receive capabilities for the corresponding serial ports of bus driver that reception state is switched to by transmission state, and
Start timing.
S230, when timing duration reaches the preset duration, opens the receive capabilities of the serial ports, to receive bus
On valid data.
Echo interference removing method provided in this embodiment, when bus driver 1 is switched to reception state by transmission state,
First close the serial ports receive capabilities in 1 counterpart terminal of bus driver, and timing；When timing duration reaches preset duration
Afterwards, the serial ports receive capabilities are then turned on, avoid receiving the echo error code in bus.Since preset duration is much larger than in bus
Echo reflection is returned the time used, and much smaller than the response time that valid data are returned in bus, therefore, will not be received
Any echo error code, and will not miss and receive any valid data in bus.To sum up, the echo interference removing method can be complete
It totally disappeared except the echo interference in bus.
Corresponding to above-mentioned echo interference removing method, present invention also offers echo interference cancellation element embodiment.
Fig. 7 is referred to, shows a kind of structure diagram of echo interference cancellation element provided by the embodiments of the present application, institute
Device is stated applied in terminal.
As shown in fig. 7, described device can include state switch control unit 10 and acquiring unit 20.
State switch control unit 10 be configured as data sending to be sent it is complete when, control the bus driver by
Transmission state is switched to reception state.
When transmitting terminal determines that data sending to be sent is complete, switching drives with the transmission drive end of bus driver and reception
The level state of the I/O ports at end（Low level is switched to from high level；Or it is switched to high level from low level）, realize that control is total
The state switching of line drive.
Acquiring unit 20 is configured as being spaced since when the bus driver is switched to reception state by transmission state
Preset duration, obtains the valid data in bus, wherein, the preset duration is more than echo reflection in bus when returning used
Between, and less than the response time that valid data are returned in bus.
Echo interference cancellation element provided in this embodiment, is detecting that bus driver is switched to reception by transmission state
During state, the valid data obtained again by acquiring unit after preset duration in bus are spaced.Preset duration is more than echo reflection
Return the time used, in this way, after terminal has sent data, after being spaced preset duration, can just receive the valid data in bus.
So as to avoid the transmission time of echo error code, the wrong data that terminal by mistake returns bus reflections is avoided as significant figure
According to.Moreover, preset duration is less than the response time for returning to valid data in bus, can ensure miss what is transmitted in bus
Valid data.In conclusion the echo interference in bus can be completely eliminated in the echo interference removing method.
Fig. 8 is referred to, shows another kind echo interference cancellation element of the embodiment of the present invention.Acquiring unit 20 in Fig. 8
It can include：First timing unit 21 and data empty unit 22.
State switch control unit 10 be configured as data sending to be sent it is complete when, control the bus driver by
Transmission state is switched to reception state.
First timing unit 21 is configured as the state switch control unit controlling bus driver by transmission state
When being switched to reception state, start timing.
When data empty unit 22 and are configured as the timing duration of the first timing unit and reach preset duration, empty described
Data in bus driver counterpart terminal in buffer, to receive the valid data in bus.
Alternatively, as shown in figure 8, the acquiring unit can also include data receipt unit 23.
The data receipt unit 23 is used to empty in the bus driver counterpart terminal when the data empty unit 22
During data in buffer, the valid data transmitted in bus are received.
Echo interference cancellation element provided in this embodiment, when bus driver is switched to reception state by transmission state
When, the timing by the first timing unit.When the timing duration of the first timing unit reaches preset duration, empty in terminal and delay
Data in storage, so that terminal receives the valid data in bus.Since preset duration is much larger than the echo reflection in bus
Return the time used, and much smaller than the response time that valid data are returned in bus, therefore, it is possible to which the whole received is returned
Ripple error code（Wrong data）Delete, and the valid data in bus will not be deleted by mistake.To sum up, the echo interference removing method
The echo interference in bus can be completely eliminated.
Fig. 9 is referred to, shows the structure diagram of another echo interference cancellation element of the embodiment of the present invention.Wherein,
Acquiring unit in Fig. 8 is refined as receiving closing unit 24, the second timing unit 25 and receives opening unit 26.
State switch control unit 10 be configured as data sending to be sent it is complete when, control the bus driver by
Transmission state is switched to reception state.
When receiving closing unit 24 and being configured as controlling bus driver and be switched to reception state by transmission state, close
The receive capabilities of the corresponding serial ports of bus driver of reception state are switched to by transmission state.
Second timing unit 25 is configured as the state switch control unit controlling bus driver by transmission state
When being switched to reception state, start timing；
When the timing duration that reception opening unit 26 is configured as the second timing unit reaches preset duration, described in unlatching
The receive capabilities of serial ports, to receive the valid data in bus.
Echo interference cancellation element provided in this embodiment, reception state is switched in bus driver by transmission state
When, first close serial ports receive capabilities in the bus driver counterpart terminal by receiving closing unit.Meanwhile by the second meter
Shi Danyuan starts timing, after timing duration reaches preset duration, is then turned on the serial ports receive capabilities.Avoid receiving in bus
Echo error code.Since preset duration is returned the time used much larger than the echo reflection in bus, and it is much smaller than in bus and returns
The response time of valid data is returned, therefore, any echo error code that will not be received, and will not miss to receive and any have in bus
Imitate data.To sum up, the echo interference in bus can be completely eliminated in the echo interference removing method.
On the other hand, the present invention also provides a kind of terminal, including processor；For storing depositing for processor-executable instruction
Reservoir；Wherein, the processor is configured as：
When data sending to be sent is complete, the bus driver is controlled to be switched to reception state by transmission state；From
Preset duration is spaced when the bus driver is switched to reception state by transmission state, controls the bus driver to obtain
The valid data in bus are taken, wherein, the preset duration is more than echo reflection in bus and returns the time used, and less than total
The response time of valid data is returned on line.
The description of embodiment of the method more than, it is apparent to those skilled in the art that the present invention can
Realized by the mode of software plus required general hardware platform, naturally it is also possible to by hardware, but in many cases the former
It is more preferably embodiment.Based on such understanding, technical scheme substantially makes tribute to the prior art in other words
The part offered can be embodied in the form of software product, which is stored in a storage medium, bag
Some instructions are included to use so that a computer equipment（Can be personal computer, server, or network equipment etc.）Perform
The all or part of step of each embodiment the method for the present invention.And foregoing storage medium includes：Read-only storage
（ROM）, random access memory（RAM）, magnetic disc or CD etc. are various can be with the medium of store program codes.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.Especially for device or
For system embodiment, since it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to method
The part explanation of embodiment.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit that separating component illustrates may or may not be it is physically separate, can be as the component that unit is shown or
Person may not be physical location, you can with positioned at a place, or can also be distributed in multiple network unit.Can root
Factually border needs to select some or all of module therein realize the purpose of this embodiment scheme.Ordinary skill
Personnel are without creative efforts, you can to understand and implement.
The present invention can be described in the general context of computer executable instructions, such as program
Module.Usually, program module includes performing particular task or realizes routine, program, object, the group of particular abstract data type
Part, data structure etc..The present invention can also be put into practice in a distributed computing environment, in these distributed computing environment, by
Task is performed and connected remote processing devices by communication network.In a distributed computing environment, program module can be with
In the local and remote computer-readable storage medium including storage device.
It should be noted that herein, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operate it
Between there are any actual relationship or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Cover non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include those
Key element, but also including other elements that are not explicitly listed, or further include as this process, method, article or set
Standby intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there are other identical element in the process, method, article or apparatus that includes the element.
The above is only the embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
- A kind of 1. echo interference removing method, applied in terminal, it is characterised in that including：When data sending to be sent is complete, controlling bus driver is switched to reception state by transmission state；Preset duration is spaced since when the bus driver is switched to reception state by transmission state, controls the bus to drive Dynamic device obtains the valid data in bus, wherein, the preset duration is more than echo reflection in bus and returns the time used, and Less than the response time that valid data are returned in bus；It is described that preset duration is spaced since when the bus driver is switched to reception state by transmission state, control described total Line drive obtains the valid data in bus, including：When controlling bus driver is switched to reception state by transmission state, closes and reception state is switched to by transmission state The receive capabilities of the corresponding serial ports of bus driver, and start timing；When timing duration reaches the preset duration, the receive capabilities of the serial ports are opened, it is effective in bus to receive Data.
- 2. according to the method described in claim 1, it is characterized in that, it is switched to reception from the bus driver by transmission state Start to be spaced preset duration during state, control the bus driver to obtain the valid data in bus, including：When controlling bus driver is switched to reception state by transmission state, start timing；When timing duration reaches the preset duration, the data in buffer in the bus driver counterpart terminal are emptied, To receive the valid data in bus.
- 3. according to the method described in claim 2, it is characterized in that, emptying buffer in the bus driver counterpart terminal In data after, further include：Receive the valid data transmitted in bus.
- 4. according to the method described in claim 1, it is characterized in that, close the receive capabilities of the serial ports, including：The level state of the reception data terminal of the terminal is converted into inactive level state, the inactive level state includes height Level or low level.
- A kind of 5. echo interference cancellation element, it is characterised in that including：State switch control unit, for when data sending to be sent is complete, controlling bus driver to be switched by transmission state To reception state；Acquiring unit, for being spaced preset duration since when the bus driver is switched to reception state by transmission state, The bus driver is controlled to obtain the valid data in bus, wherein, the preset duration is more than echo reflection in bus and returns Come the time used, and less than the response time that valid data are returned in bus；The acquiring unit includes：Closing unit is received, when controlling bus driver is switched to reception state by transmission state, closes and is cut by transmission state Change to the receive capabilities of the corresponding serial ports of bus driver of reception state；Second timing unit, for when controlling bus driver is switched to reception state by transmission state, starting timing；Opening unit is received, for when timing duration reaches preset duration, the receive capabilities of the serial ports being opened, to receive Valid data in bus.
- 6. device according to claim 5, it is characterised in that the acquiring unit includes：First timing unit, for when controlling bus driver is switched to reception state by transmission state, starting timing；Data empty unit, delay for when timing duration reaches preset duration, emptying in the bus driver counterpart terminal Data in storage, to receive the valid data transmitted in bus.
- 7. device according to claim 6, it is characterised in that the acquiring unit further includes：Data receipt unit, for being emptied when the data empty unit in the bus driver counterpart terminal in buffer During data, the valid data transmitted in bus are received.
- A kind of 8. terminal, it is characterised in that including：Processor；For storing the memory of processor-executable instruction；Wherein, the processor is configured as：When data sending to be sent is complete, controlling bus driver is switched to reception state by transmission state；Preset duration is spaced since when the bus driver is switched to reception state by transmission state, controls the bus to drive Dynamic device obtains the valid data in bus, wherein, the preset duration is more than echo reflection in bus and returns the time used, and Less than the response time that valid data are returned in bus；It is described that preset duration is spaced since when the bus driver is switched to reception state by transmission state, control described total Line drive obtains the valid data in bus, including：When controlling bus driver is switched to reception state by transmission state, closes and reception state is switched to by transmission state The receive capabilities of the corresponding serial ports of bus driver, and start timing；When timing duration reaches the preset duration, the receive capabilities of the serial ports are opened, it is effective in bus to receive Data.
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| CN201410133872.5A CN104980186B (en) | 2014-04-03 | 2014-04-03 | Echo interference removing method and relevant apparatus |
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| CN201410133872.5A CN104980186B (en) | 2014-04-03 | 2014-04-03 | Echo interference removing method and relevant apparatus |
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| CN104980186B true CN104980186B (en) | 2018-05-15 |
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| CN1573719A (en) * | 2003-06-13 | 2005-02-02 | 国际商业机器公司 | Serial bus interface and method for serially interconnecting time-critical digital devices |
| CN101719112A (en) * | 2009-11-19 | 2010-06-02 | 北京东方信联科技有限公司 | Half-duplex automatic receiving-transmitting switching circuit of RS485 |
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