CN104636215B - A kind of hardware watchdog and its application circuit - Google Patents
A kind of hardware watchdog and its application circuit Download PDFInfo
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- CN104636215B CN104636215B CN201510110127.3A CN201510110127A CN104636215B CN 104636215 B CN104636215 B CN 104636215B CN 201510110127 A CN201510110127 A CN 201510110127A CN 104636215 B CN104636215 B CN 104636215B
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- 238000012544 monitoring process Methods 0.000 claims abstract description 33
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- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000012790 confirmation Methods 0.000 claims abstract description 15
- 238000012840 feeding operation Methods 0.000 claims abstract description 10
- 125000004122 cyclic group Chemical group 0.000 claims description 9
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- 238000005516 engineering process Methods 0.000 description 3
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- 238000012545 processing Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
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- 230000014509 gene expression Effects 0.000 description 1
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Abstract
The application provides a kind of hardware watchdog and its application circuit, realizes that the message between control chip and monitoring chip sends and receives by communication interface circuit；Hello dog request message is sent to control chip, it is desirable to which control chip replys dog feeding operation message within the default beginning and ending time, otherwise exports reset signal by monitoring chip timing；And after the low-power consumption mode request message that control chip is sent is received, low-power consumption mode confirmation message is replied, and the transmission of dog request message is fed in pause in the first stipulated time section；Reset signal is received by reset circuit, generates and exports reseting controling signal to control chip, control control chip reset.The hardware watchdog that the application provides, is the circuit independently of control chip, and software watchdog reliability more of the prior art is high；The request of low-power consumption mode is realized by communication interface circuit at the same time, so as to fulfill low-power consumption, energy saving is improved for system than conventional hardware house dog.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of hardware watchdog and its application circuit.
Background technology
House dog is the operating status for control chip in observation circuit (microcontroller or microprocessor MPU)
Functional unit, can go wrong, when the control chip enters endless loop state in circuit, reset the control chip, with
Prevent from causing more mistakes.
House dog of the prior art is divided into software watchdog and hardware watchdog.
Software watchdog is usually integrated in the watchdog module inside control chip, itself is controlled by software, to software
Reliability dependence is stronger.
Hardware watchdog is typically relatively independent reset function circuit, due to the spilling time one of conventional hardware house dog
As it is non-adjustable or can only be adjusted within the limited time, cause system to be also needed to after low-power consumption mode is entered with higher frequency
Rate is waken up to complete to feed dog, this may cause the reduction of energy saving of system performance.
The content of the invention
In view of this, the present invention provides a kind of hardware watchdog and its application circuit, to solve software in the prior art
House dog reliability is low and the problem of the operating mode of hardware watchdog causes energy saving of system low.
To achieve these goals, technical solution provided in an embodiment of the present invention is as follows：
A kind of hardware watchdog, applied to the monitoring of the operating status to control chip, the hardware watchdog includes：
The communication interface circuit that one end is connected with the control chip, sends for the message between the control chip
And reception；
The monitoring chip being connected with the other end of the communication interface circuit, the monitoring chip are used for timing to the control
Coremaking piece, which is sent, feeds dog request message, it is desirable to which the control chip replys dog feeding operation message within the default beginning and ending time, otherwise
Reset signal is exported, is additionally operable to after the low-power consumption mode request message that the control chip is sent is received, replys low-power consumption mould
Formula confirmation message, and the pause transmission for feeding dog request message in the first stipulated time section；
The reset circuit that is connected of reset output pin of one input terminal and the monitoring chip, the reset circuit it is defeated
Outlet is connected with the reset input pin of the control chip, and the reset circuit is used to receive the reset signal, and generation is simultaneously
Reseting controling signal is exported to the control chip.
Preferably, the monitoring chip is additionally operable to：After the watchdog service delay request message that the control chip is sent is received,
Reply watchdog service delay characteristic message, and the pause transmission for feeding dog request message in the second stipulated time section.
Preferably, the communication interface circuit is serial control interface SCI.
Preferably, the reset circuit is and door.
Preferably, another input terminal of the reset circuit is connected with reset source.
Preferably, described feed in dog request message and the low-power consumption mode confirmation message includes cyclic redundancy check
Code.
Preferably, the watchdog service delay characteristic message includes Cyclic Redundancy Check Code.
Preferably,
During the requirement for the low-power consumption mode request message that the first stipulated time section sends for the control chip
It is long, or
The first stipulated time section suspends duration for default low-power consumption mode in the monitoring chip.
Preferably,
The requirement duration for the watchdog service delay request message that the second stipulated time section sends for the control chip,
Or
The second stipulated time section suspends duration for default watchdog service delay in the monitoring chip.
A kind of hardware watchdog application circuit, it is characterised in that seen including control chip and any of the above-described hardware
Door dog.
The application provides a kind of hardware watchdog, is realized by communication interface circuit between control chip and monitoring chip
Message sends and receives；Hello dog request message is sent to the control chip, it is desirable to the control core by monitoring chip timing
Piece replys dog feeding operation message within the default beginning and ending time, otherwise exports reset signal；And sent receiving the control chip
Low-power consumption mode request message after, reply low-power consumption mode confirmation message, and pause is described feeds in the first stipulated time section
The transmission of dog request message；The reset signal is received by reset circuit, generates and exports reseting controling signal to the control
Chip, controls the control chip to reset.The hardware watchdog that the application provides, is the electricity independently of the control chip
Road, software watchdog reliability more of the prior art are high；The request of low-power consumption mode is realized by communication interface circuit at the same time,
So as to fulfill low-power consumption, energy saving is improved for system than conventional hardware house dog.
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, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of hardware watchdog structure diagram provided by the embodiments of the present application；
Fig. 2 defines schematic diagram for a kind of message provided by the embodiments of the present application；
Fig. 3 defines schematic diagram for a kind of message provided by the embodiments of the present application；
Fig. 4 defines schematic diagram for a kind of message provided by the embodiments of the present application.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
The present invention provides a kind of hardware watchdog and its application circuit, the prison applied to the operating status to control chip
Survey, to solve, software watchdog reliability is low in the prior art and the operating mode of hardware watchdog causes energy saving of system low
Problem.
Specifically, as shown in Figure 1, the hardware watchdog includes：
The communication interface circuit 101 that one end is connected with control chip 100；
The monitoring chip 102 being connected with the other end of communication interface circuit 101；
The reset circuit 103 that one input terminal is connected with monitoring the reset output pin of chip 102, reset circuit 103
Output terminal is connected with the reset input pin of control chip 100.
Specifically operation principle is：
The hardware watchdog realizes control chip 100 by communication interface circuit 101 and monitors the report between chip 102
Text sends and receives.Monitor 102 timing of chip and send hello dog request message (MCU Feed Message) to control chip 100,
It is required that control chip 100 replys dog feeding operation message within the default beginning and ending time, reset signal is otherwise exported；And controlled receiving
After the low-power consumption mode request message (MCU Request Low Power Message) that chip 100 is sent, low-power consumption mould is replied
Formula confirmation message, and the pause transmission for feeding dog request message in the first stipulated time section.Reset circuit 103 receives described
Reset signal, generates and exports reseting controling signal to control chip 100.
Under low-power consumption mode, the concrete operating principle of the hardware watchdog is：
When the system goes into low power mode, control chip 100 actively sends the low-power consumption mode request message, application
Into low-power consumption mode.Under low-power consumption mode, system hello the dog time is appropriately extended to reduce overall power according to demand.Guard the gate
Dog MCU replys low-power consumption mode request confirmation message after the request message is received, and enters low-power consumption mode.In low-power consumption
Pattern, monitoring chip 102 automatically wakes up after the first stipulated time section, and dog request message is fed described in transmission normally.
If system low-power consumption pattern is over, the dog feeding operation message back to normal of control chip 100 with complete feed dog；If it is
System still in low-power consumption mode, complete to feed dog by the dog feeding operation message that control chip 100 can be back to normal first, and again
It is secondary to send the low-power consumption mode request message, after monitoring chip 102 replys the low-power consumption mode request confirmation message, be
System is again introduced into low-power consumption mode.
Wherein, the reset source can be any form of power supply, be not specifically limited herein.
The hardware watchdog that the application provides, is the circuit independently of control chip 100, more of the prior art soft
Part house dog reliability is high；The request of low-power consumption mode is realized by communication interface circuit at the same time, so as to fulfill low-power consumption, than passing
System hardware watchdog improves energy saving for system.
Preferably, monitoring chip 102 is additionally operable to：Receiving the watchdog service delay request message (MCU of the transmission of control chip 100
Request Delay Message) after, watchdog service delay characteristic message (WDM Acknowledge Delay Message) is replied,
And the pause transmission for feeding dog request message in the second stipulated time section.
Control chip 100 can feed dog request message, application a period of time by active forward delay interval when bus load is higher
Watchdog service delay (is probably data calculating or arithmetic analysis etc., these affairs may consume to improve system processing complex transaction
Take the more time and do not support to be interrupted) performance.Chip 102 is monitored after the watchdog service delay request message is received
Reply the watchdog service delay characteristic message, and the pause transmission for feeding dog request message in the second stipulated time section so that
In second stipulated time section, the hardware watchdog will not reset control chip 100；When the second stipulated time
Section terminates, namely after the watchdog service delay time, monitoring chip 102 may proceed to the transmission for feeding dog request message, return to
Normal hello dog characteristic realizes process.
Traditional hardware watchdog in the prior art, with the rising of system design complexity and increasing for function module,
Very important system resources consumption is brought to system because the workload of control chip is continuously increased.And the present embodiment by
In introducing watchdog service delay characteristic, the ability of system processing complex transaction is enhanced.
Preferably, communication interface circuit 101 is serial control interface SCI (Serial Communication
Interface)。
In specific practical application, communication interface circuit 101 can use serial control interface SCI, can also use
UART Universal Asynchronous Receiver Transmitter UART (Universal Asynchronous Receiver/Transmitter), or others connect
Mouth circuit, is not specifically limited, depending on its specific application environment herein.
Preferably, reset circuit 103 is and door.
In specific practical application, anti-phase diode in parallel can also be used to realize reset circuit with pull-up resistor
103, it is not specifically limited herein, depending on its specific application environment.
Preferably, another input terminal of reset circuit 103 is connected with reset source.
In specific practical application, the reset control for resetting input pin and receiving of control chip 100 can be used
When signal processed is low level, control chip 100, which is realized, to be resetted.It is only herein a kind of example, does not do specific restriction.
Preferably, described feed in dog request message and the low-power consumption mode confirmation message includes cyclic redundancy check
Code.
Preferably, first stipulated time section low-power consumption mode request message that chip 100 is sent in order to control
It is required that duration.
Alternatively, the first stipulated time section suspends duration for default low-power consumption mode in monitoring chip 102.
In specific practical application, the source of the first stipulated time section is not necessarily limited to above two side
Formula, can be depending on its specific application environment.The low-power consumption mode request message can include using under low-power consumption mode
House dog feed the dog time.
It is specifically described by taking Fig. 2 as an example, dog request is fed described in monitoring 102 timing of chip to the transmission of control chip 100
In message, Byte 0 (defines 01 and represents the request of hello dog) for command code, Byte 1:2 (define to feed dog time window initial time
0064 represents 100ms), Byte 3:4 is feed dog time window deadline and (define 00C8 and represent 200ms), then when presetting start-stop
Between T be to feed the 100ms after dog request message is sent between 200ms from described, Byte 5 is that the circulation of foregoing 5 bytes is superfluous
Remaining CRC check code.I.e. described dog request message of feeding represents：It is required that control chip 100 is after hello the dog request message is sent
The dog feeding operation message is replied within 100ms to 200ms.
Correspondingly, in the dog feeding operation message that control chip 100 is replied, Byte 0 (defines 81 to represent for command code
Feed dog request feedback), Byte 1:2 feed the sum of initial time and deadline arithmetical operation (definition in dog request message to be described
012C is represented in 100ms to 200ms), Byte 3 is the cyclic redundancy CRC check code of foregoing 3 bytes.I.e. described dog feeding operation
Message represents：Control chip 100 must reply hello the dog in described feed within 100ms to 200ms after dog request message is sent
Message is operated to chip 102 is monitored, is responsible for verification failure, monitoring chip 102 will export reset signal, and pass through reset circuit 103
Reset control chip 100.
It is specifically described by taking Fig. 3 as an example, the low-power consumption mode that control chip 100 is sent to monitoring chip 102 please
Ask in message, Byte 0 (defines 83 and represent low-power consumption mode request) for command code, Byte 1:2 be to be required under low-power consumption mode
Pause duration (define 03E8 represent 1000ms), Byte 3 is the cyclic redundancy CRC check code of foregoing 3 bytes.It is i.e. described
Low-power consumption mode request message represents：It is required that 1000ms of the monitoring chip 102 after the low-power consumption mode confirmation message is sent
It is interior, the pause transmission for feeding dog request message.
Correspondingly, in the low-power consumption mode confirmation message that monitoring chip 102 is replied to control chip 100, Byte 0
(define 03 for command code and represent that low-power consumption mode request confirms), Byte 1:2 feed dog time window initial time for low-power consumption
(define 03E8 and represent 1000ms), Byte 3:4 feed dog time window deadline (definition 04B0 expressions for low-power consumption
1200ms), then the first stipulated time section t1 be from the low-power consumption mode confirmation message transmission after 0ms to 1000ms it
Between, Byte 5 is the cyclic redundancy CRC check code of foregoing 5 bytes.I.e. described low-power consumption mode confirmation message represents：Monitor core
In the 1000ms after sending the low-power consumption mode confirmation message, the pause transmission for feeding dog request message, is sending out piece 102
Send and normal hello the dog request message is sent in the 1000ms to 1200ms after the low-power consumption mode confirmation message.
Computing and verification of the present embodiment due to adding information, improve the inspection level to system exception, function is more
Add reliable.
Preferably, the watchdog service delay characteristic message includes Cyclic Redundancy Check Code.
Preferably, second stipulated time section watchdog service delay request message that chip 100 is sent in order to control will
Seek duration.
Alternatively, the second stipulated time section suspends duration for default watchdog service delay in monitoring chip 102.
In specific practical application, the source of the second stipulated time section is not necessarily limited to above two side
Formula, can be depending on its specific application environment.The watchdog service delay request message can include system processing complex transaction shape
The house dog used under state feeds the dog time.
It is specifically described by taking Fig. 4 as an example, the watchdog service delay that control chip 100 is sent to monitoring chip 102 is asked
In message, Byte 0 (defines 82 and represents watchdog service delay request) for command code, Byte 1:2 be the watchdog service delay request message
Requirement duration (define 01F4 represent 500ms), Byte 3 is the cyclic redundancy CRC check code of foregoing 3 bytes.The delay
Dog request message is fed to represent：It is required that monitoring chip 102 is in the 500ms after sending the watchdog service delay characteristic message described in pause
Feed the transmission of dog request message.
Correspondingly, in the watchdog service delay characteristic message that monitoring chip 102 is sent to control chip 100, Byte 0 is
Command code (defines 02 and represents that watchdog service delay confirms), Byte 1:2 (define 01F4 tables for watchdog service delay time window initial time
Show 500ms), Byte 3:4 (define 02BC and represent 700ms) for watchdog service delay time window deadline, then the second stipulated time
Section t2 is that Byte 5 is following for foregoing 5 bytes from the 0ms after watchdog service delay characteristic message transmission between 500ms
Ring redundancy CRC check code.The watchdog service delay characteristic message represents：Monitor chip 102 and send the watchdog service delay characteristic report
The pause transmission for feeding dog request message in 500ms after text, the 500ms after the watchdog service delay characteristic message is sent is extremely
Normal hello the dog request message is sent in 700ms.
Another embodiment of the present invention additionally provides a kind of hardware watchdog application circuit, including control chip and above-mentioned implementation
Any hardware watchdog in example.
Specific connection mode and operation principle are same as the previously described embodiments, and details are not described herein again.
Each embodiment is described by the way of progressive in the present invention, and what each embodiment stressed is and other realities
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is referring to method part illustration
.
It the above is only the preferred embodiment of the present invention, make skilled artisans appreciate that or realizing of the invention.It is right
A variety of modifications of these embodiments will be apparent to one skilled in the art, as defined herein general former
Reason can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will not
Be intended to be limited to the embodiments shown herein, and be to fit to it is consistent with the principles and novel features disclosed herein most
Wide scope.
Claims (9)
1. a kind of hardware watchdog, it is characterised in that applied to the monitoring of the operating status to control chip, the hardware is guarded the gate
Dog includes：
The communication interface circuit that one end is connected with the control chip, sends and connects for the message between the control chip
Receive；
The monitoring chip being connected with the other end of the communication interface circuit, the monitoring chip are used for timing to the control core
Piece, which is sent, feeds dog request message, it is desirable to which the control chip replys dog feeding operation message within the default beginning and ending time, otherwise exports
Reset signal, is additionally operable to after the low-power consumption mode request message that the control chip is sent is received, and it is true to reply low-power consumption mode
Recognize message, and the pause transmission for feeding dog request message in the first stipulated time section；It is additionally operable to receiving the control core
After the watchdog service delay request message that piece is sent, watchdog service delay characteristic message is replied, and in the second stipulated time section described in pause
Feed the transmission of dog request message；
The reset circuit that one input terminal is connected with the reset output pin of the monitoring chip, the output terminal of the reset circuit
It is connected with the reset input pin of the control chip, the reset circuit is used to receive the reset signal, generates and exports
Reseting controling signal is to the control chip.
2. hardware watchdog according to claim 1, it is characterised in that the communication interface circuit is serial control interface
SCI。
3. hardware watchdog according to claim 1, it is characterised in that the reset circuit be and door.
4. hardware watchdog according to claim 1, it is characterised in that another input terminal of the reset circuit is with answering
Potential source is connected.
5. hardware watchdog according to claim 1, it is characterised in that described to feed dog request message and the low-power consumption mould
Include Cyclic Redundancy Check Code in formula confirmation message.
6. hardware watchdog according to claim 1, it is characterised in that the watchdog service delay characteristic message includes circulation
Redundant check code.
7. hardware watchdog according to claim 1, it is characterised in that
The requirement duration for the low-power consumption mode request message that the first stipulated time section sends for the control chip, or
Person
The first stipulated time section suspends duration for default low-power consumption mode in the monitoring chip.
8. hardware watchdog according to claim 1, it is characterised in that
The requirement duration for the watchdog service delay request message that the second stipulated time section sends for the control chip, or
The second stipulated time section suspends duration for default watchdog service delay in the monitoring chip.
9. a kind of hardware watchdog application circuit, it is characterised in that any described including control chip and claim 1 to 8
Hardware watchdog.
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| CN201510110127.3A CN104636215B (en) | 2015-03-13 | 2015-03-13 | A kind of hardware watchdog and its application circuit |
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| CN201510110127.3A CN104636215B (en) | 2015-03-13 | 2015-03-13 | A kind of hardware watchdog and its application circuit |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106844164A (en) * | 2015-12-06 | 2017-06-13 | 上海协同科技股份有限公司 | Device and its reset monitoring method with polylith intelligent chip |
| CN107943603B (en) * | 2016-10-13 | 2022-07-15 | 迈普通信技术股份有限公司 | Running state detection method, detection circuit and electronic equipment |
| CN106598780A (en) * | 2016-11-22 | 2017-04-26 | 深圳中科讯联科技股份有限公司 | System backup and recovery method and device |
| CN109614261B (en) * | 2018-12-12 | 2022-04-05 | 中国航发南方工业有限公司 | Hardware watchdog circuit with task time sequence monitoring function and single chip microcomputer control system |
| CN110834541B (en) * | 2019-11-15 | 2022-02-08 | 上海元城汽车技术有限公司 | Safety monitoring method and related device |
| CN114740783A (en) * | 2022-04-27 | 2022-07-12 | 歌尔股份有限公司 | Monitoring method, system and device and electronic equipment |
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| CN101751303A (en) * | 2008-12-17 | 2010-06-23 | Tcl集团股份有限公司 | Watchdog system in embedded device and control method thereof |
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Address after: 4 / F, building 1, No.14 Jiuxianqiao Road, Chaoyang District, Beijing 100020 Patentee after: Beijing Jingwei Hirain Technologies Co.,Inc. Address before: 8 / F, block B, No. 11, Anxiang Beili, Chaoyang District, Beijing 100101 Patentee before: Beijing Jingwei HiRain Technologies Co.,Ltd. |