CN104636215A - Hardware watchdog and application circuit thereof - Google Patents
Hardware watchdog and application circuit thereof Download PDFInfo
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- CN104636215A CN104636215A CN201510110127.3A CN201510110127A CN104636215A CN 104636215 A CN104636215 A CN 104636215A CN 201510110127 A CN201510110127 A CN 201510110127A CN 104636215 A CN104636215 A CN 104636215A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 38
- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000012840 feeding operation Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 19
- 238000012790 confirmation Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 125000004122 cyclic group Chemical group 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000026676 system process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention provides a hardware watchdog and an application circuit thereof. Message sending and receiving between a control chip and a monitoring chip are achieved by a communication interface circuit; a dog feeding request message is periodically sent to the control chip through the monitoring chip to require the control chip to reply a dog feeding operation message within a preset starting and ending time, if not, a reset signal is output; a low power consumption mode acknowledgment message is sent after a low power consumption mode request message sent by the control chip is received, and the sending of the dog feeding request message is paused within a first regulated time period; a reset circuit receives the reset signal and generates and outputs a reset control signal to the control chip, to control the control chip to reset. The hardware watchdog provided by the invention is a circuit independent from the control chip, and the reliability is higher than that of a software watchdog in the prior art; meanwhile, the low power consumption mode is achieved through the communication interface circuit to achieve low power consumption, and the energy saving property of the system is improved compared with a traditional hardware watchdog.
Description
Technical field
The present invention relates to electronic circuit technology field, particularly relate to a kind of hardware watchdog and application circuit thereof.
Background technology
House dog is the functional unit of the running status for control chip in observation circuit (microcontroller or microprocessor MPU), can go wrong at circuit, described control chip is when entering endless loop state, reset described control chip, to prevent from causing more mistake.
House dog of the prior art is divided into software watchdog and hardware watchdog.
Software watchdog is normally integrated in the watchdog module of control chip inside, and itself is stronger to software reliability dependence by software control.
The reset function circuit that hardware watchdog is normally relatively independent, because the spilling time of conventional hardware house dog is generally non-adjustable or can only adjust within the limited time, cause system also to need to have waken up to feed dog with higher frequency after entering low-power consumption mode, this may cause the reduction of energy saving of system performance.
Summary of the invention
In view of this, the invention provides a kind of hardware watchdog and application circuit thereof, to solve the problem that the mode of operation that is low and hardware watchdog of software watchdog reliability in prior art causes energy saving of system low.
To achieve these goals, the technical scheme that provides of the embodiment of the present invention is as follows:
A kind of hardware watchdog, be applied to the monitoring of the running status to control chip, described hardware watchdog comprises:
The communication interface circuit that one end is connected with described control chip, sends for the message between described control chip and receives;
The chip monitoring be connected with the other end of described communication interface circuit, described chip monitoring is used for timing and sends hello dog request message to described control chip, require that described control chip replys dog feeding operation message within the default beginning and ending time, otherwise output reset signal, also for after the low-power consumption mode request message receiving the transmission of described control chip, reply low-power consumption mode confirmation message, and in the first stipulated time section, suspend described transmission of feeding dog request message;
The reset circuit that an input end is connected with the reset output pin of described detection chip, the output terminal of described reset circuit is connected with the reset input pin of described control chip, described reset circuit, for receiving described reset signal, generates and exports reseting controling signal to described control chip.
Preferably, described chip monitoring also for: after receiving the watchdog service delay request message that described control chip sends, reply watchdog service delay characteristic message, and in the second stipulated time section, suspend described transmission of feeding dog request message.
Preferably, described communication interface circuit is serial control interface SCI.
Preferably, described reset circuit is and door.
Preferably, another input end of described reset circuit is connected with reset source.
Preferably, described feeding in dog request message and described low-power consumption mode confirmation message includes CRC.
Preferably, described watchdog service delay characteristic message comprises CRC.
Preferably,
Described first stipulated time section is the requirement duration of the described low-power consumption mode request message that described control chip sends, or
Described first stipulated time section is that the low-power consumption mode preset in described chip monitoring suspends duration.
Preferably,
Described second stipulated time section is the requirement duration of the described watchdog service delay request message that described control chip sends, or
Described second stipulated time section is that the watchdog service delay preset in described chip monitoring suspends duration.
A kind of hardware watchdog application circuit, is characterized in that, comprises control chip and above-mentioned arbitrary described hardware watchdog.
The application provides a kind of hardware watchdog, is sent by the communication interface circuit message realized between control chip and chip monitoring and is received; Send hello dog request message by chip monitoring timing to described control chip, require that described control chip replys dog feeding operation message within the default beginning and ending time, otherwise export reset signal; And after the low-power consumption mode request message receiving the transmission of described control chip, reply low-power consumption mode confirmation message, and in the first stipulated time section, suspend described transmission of feeding dog request message; Receive described reset signal by reset circuit, generate and export reseting controling signal to described control chip, controlling described control chip and reset.The described hardware watchdog that the application provides, be the circuit independent of described control chip, software watchdog reliability more of the prior art is high; Being realized the request of low-power consumption mode simultaneously by communication interface circuit, thus realize low-power consumption, is that system improves energy saving than conventional hardware house dog.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
A kind of hardware watchdog structural representation that Fig. 1 provides for the embodiment of the present application;
A kind of message definition schematic diagram that Fig. 2 provides for the embodiment of the present application;
A kind of message definition schematic diagram that Fig. 3 provides for the embodiment of the present application;
A kind of message definition schematic diagram that Fig. 4 provides for the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of hardware watchdog and application circuit thereof, be applied to the monitoring of the running status to control chip, to solve the problem that the mode of operation that is low and hardware watchdog of software watchdog reliability in prior art causes energy saving of system low.
Concrete, as shown in Figure 1, described hardware watchdog comprises:
The communication interface circuit 101 that one end is connected with control chip 100;
The chip monitoring 102 be connected with the other end of communication interface circuit 101;
The reset circuit 103 that an input end is connected with the reset output pin of detection chip 102, the output terminal of reset circuit 103 is connected with the reset input pin of control chip 100.
Concrete principle of work is:
Described hardware watchdog is sent by communication interface circuit 101 message realized between control chip 100 and chip monitoring 102 and is received.Chip monitoring 102 timing sends to control chip 100 and feeds dog request message (MCU Feed Message), requires that control chip 100 replys dog feeding operation message within the default beginning and ending time, otherwise exports reset signal; And after the low-power consumption mode request message (MCU Request Low Power Message) receiving control chip 100 transmission, reply low-power consumption mode confirmation message, and in the first stipulated time section, suspend described transmission of feeding dog request message.Reset circuit 103 receives described reset signal, generates and exports reseting controling signal to control chip 100.
Under low-power consumption mode, the specific works principle of described hardware watchdog is:
When the system goes into low power mode, control chip 100 initiatively sends described low-power consumption mode request message, and application enters low-power consumption mode.Under low-power consumption mode, system feed the dog time according to demand proper extension to reduce overall power.House dog MCU replys low-power consumption mode request confirmation message after receiving this request message, and enters low-power consumption mode.At low-power consumption mode, chip monitoring 102 automatically wakes up after the first stipulated time section terminates, and sends normal described hello dog request message.If system low-power consumption pattern terminates, control chip 100 is replied normal described dog feeding operation message and is fed dog to complete; If system is still in low-power consumption mode, first control chip 100 can reply normal described dog feeding operation message and complete hello dog, and again send described low-power consumption mode request message, after chip monitoring 102 replys described low-power consumption mode request confirmation message, system enters low-power consumption mode again.
Wherein, described reset source can be the power supply of arbitrary form, is not specifically limited herein.
The described hardware watchdog that the application provides, be the circuit independent of control chip 100, software watchdog reliability more of the prior art is high; Being realized the request of low-power consumption mode simultaneously by communication interface circuit, thus realize low-power consumption, is that system improves energy saving than conventional hardware house dog.
Preferably, chip monitoring 102 also for: receive control chip 100 send watchdog service delay request message (MCU Request Delay Message) after, reply watchdog service delay characteristic message (WDM Acknowledge Delay Message), and in the second stipulated time section, suspend described transmission of feeding dog request message.
Control chip 100 can feed dog request message by active forward delay interval when bus load is higher, application a period of time watchdog service delay is to improve the performance of system process complex transaction (may be data calculating or arithmetic analysis etc., these affairs may expend the more time and not support to be interrupted).Chip monitoring 102 replys described watchdog service delay characteristic message after receiving described watchdog service delay request message, and in the second stipulated time section, suspend described transmission of feeding dog request message, make in described second stipulated time section, described hardware watchdog can not reset to control chip 100; When the second stipulated time section terminates, be also that after terminating the watchdog service delay time, chip monitoring 102 can continue described transmission of feeding dog request message, returns to normal implementation procedure of feeding dog characteristic.
Hardware watchdog traditional in prior art, along with the rising of system design complexity and increasing of functional module, because the operating load of control chip constantly increases and brings very important system resources consumption to system.And the present embodiment is owing to introducing watchdog service delay characteristic, enhance the ability of system process complex transaction.
Preferably, communication interface circuit 101 is serial control interface SCI (Serial Communication Interface).
In concrete practical application, communication interface circuit 101 can adopt serial control interface SCI, also UART Universal Asynchronous Receiver Transmitter UART (Universal Asynchronous Receiver/Transmitter) can be adopted, or other interface circuit, be not specifically limited, depending on the applied environment that it is concrete herein.
Preferably, reset circuit 103 is and door.
In concrete practical application, anti-phase diode in parallel and pull-up resistor can also be adopted to realize reset circuit 103, be not specifically limited, depending on the applied environment that it is concrete herein.
Preferably, another input end of reset circuit 103 is connected with reset source.
In concrete practical application, when the described reseting controling signal that the reset input pin of control chip 100 can be adopted to receive is low level, control chip 100 realizes resetting.Be only a kind of example herein, do not do concrete restriction.
Preferably, described feeding in dog request message and described low-power consumption mode confirmation message includes CRC.
Preferably, described first stipulated time section is the requirement duration of the described low-power consumption mode request message that control chip 100 sends.
Or described first stipulated time section is that the low-power consumption mode preset in chip monitoring 102 suspends duration.
In concrete practical application, the source of described first stipulated time section might not be defined in above-mentioned two kinds of modes, can depending on its concrete applied environment.The house dog used under described low-power consumption mode request message can comprise low-power consumption mode feeds the dog time.
Be specifically described for Fig. 2, chip monitoring 102 timing is fed in dog request message described in sending to control chip 100, Byte 0 is command code (definition 01 represents that feeding dog asks), Byte 1:2 is for feeding dog time window initial time (definition 0064 represents 100ms), Byte 3:4 is for feeding dog time window closing time (definition 00C8 represents 200ms), then presetting beginning and ending time T is that between the 100ms to 200ms after described hello dog request message sends, Byte 5 is the cyclic redundancy CRC check code of aforementioned 5 bytes.Namely described dog request message of feeding represents: require that control chip 100 replys described dog feeding operation message described feeding within the rear 100ms to 200ms of dog request message transmission.
Accordingly, in the described dog feeding operation message that control chip 100 is replied, Byte 0 is command code (definition 81 represents that feeding dog request feeds back), Byte 1:2 is initial time and arithmetical operation closing time sum (defining 012C to represent in 100ms to 200ms) in described hello dog request message, and Byte 3 is the cyclic redundancy CRC check code of aforementioned 3 bytes.Namely described dog feeding operation message represents: control chip 100 must reply described dog feeding operation message to chip monitoring 102 described feeding within the rear 100ms to 200ms of dog request message transmission, be responsible for verifying unsuccessfully, chip monitoring 102 will export reset signal, by reset circuit 103, control chip 100 be resetted.
Be specifically described for Fig. 3, in the described low-power consumption mode request message that control chip 100 sends to chip monitoring 102, Byte 0 is command code (definition 83 represents low-power consumption mode request), Byte1:2 is the time-out duration (definition 03E8 represents 1000ms) required under low-power consumption mode, and Byte 3 is the cyclic redundancy CRC check code of aforementioned 3 bytes.Namely described low-power consumption mode request message represents: require, in the 1000ms of chip monitoring 102 after sending described low-power consumption mode confirmation message, to suspend described transmission of feeding dog request message.
Accordingly, in the described low-power consumption mode confirmation message that chip monitoring 102 is replied to control chip 100, Byte 0 is command code (definition 03 represents that low-power consumption mode request confirms), Byte 1:2 is that dog time window initial time (definition 03E8 represents 1000ms) is fed in low-power consumption, Byte 3:4 is that dog time window closing time (definition 04B0 represents 1200ms) is fed in low-power consumption, then the first stipulated time section t1 is that between the 0ms to 1000ms after described low-power consumption mode confirmation message sends, Byte 5 is the cyclic redundancy CRC check code of aforementioned 5 bytes.Namely described low-power consumption mode confirmation message represents: in the 1000ms of chip monitoring 102 after sending described low-power consumption mode confirmation message, suspend the transmission of described hello dog request message, in the 1000ms to 1200ms after sending described low-power consumption mode confirmation message, send normal described hello dog request message.
The present embodiment is owing to adding computing and the verification of information, and improve the inspection level to system exception, function is more reliable.
Preferably, described watchdog service delay characteristic message comprises CRC.
Preferably, described second stipulated time section is the requirement duration of the described watchdog service delay request message that control chip 100 sends.
Or described second stipulated time section is that the watchdog service delay preset in chip monitoring 102 suspends duration.
In concrete practical application, the source of described second stipulated time section might not be defined in above-mentioned two kinds of modes, can depending on its concrete applied environment.The house dog that described watchdog service delay request message uses under can comprising system process complex transaction state feeds the dog time.
Be specifically described for Fig. 4, in the described watchdog service delay request message that control chip 100 sends to chip monitoring 102, Byte 0 is command code (definition 82 represents watchdog service delay request), Byte 1:2 is the requirement duration (definition 01F4 represents 500ms) of described watchdog service delay request message, and Byte 3 is the cyclic redundancy CRC check code of aforementioned 3 bytes.Described watchdog service delay request message represents: require to suspend described transmission of feeding dog request message in the 500ms of chip monitoring 102 after sending described watchdog service delay characteristic message.
Accordingly, in the described watchdog service delay characteristic message that chip monitoring 102 sends to control chip 100, Byte 0 is command code (definition 02 represents that watchdog service delay confirms), Byte 1:2 is watchdog service delay time window initial time (definition 01F4 represents 500ms), Byte 3:4 is watchdog service delay time window closing time (definition 02BC represents 700ms), then the second stipulated time section t2 is that between the 0ms to 500ms after described watchdog service delay characteristic message sends, Byte 5 is the cyclic redundancy CRC check code of aforementioned 5 bytes.Described watchdog service delay characteristic message represents: the transmission suspending described hello dog request message in the 500ms of chip monitoring 102 after sending described watchdog service delay characteristic message, sends normal described hello dog request message in the 500ms to 700ms after sending described watchdog service delay characteristic message.
Another embodiment of the present invention additionally provides a kind of hardware watchdog application circuit, comprises arbitrary described hardware watchdog in control chip and above-described embodiment.
Concrete connected mode and principle of work same as the previously described embodiments, repeat no more herein.
In the present invention, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
Below be only the preferred embodiment of the present invention, those skilled in the art understood or realizes the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a hardware watchdog, is characterized in that, is applied to the monitoring of the running status to control chip, and described hardware watchdog comprises:
The communication interface circuit that one end is connected with described control chip, sends for the message between described control chip and receives;
The chip monitoring be connected with the other end of described communication interface circuit, described chip monitoring is used for timing and sends hello dog request message to described control chip, require that described control chip replys dog feeding operation message within the default beginning and ending time, otherwise output reset signal, also for after the low-power consumption mode request message receiving the transmission of described control chip, reply low-power consumption mode confirmation message, and in the first stipulated time section, suspend described transmission of feeding dog request message;
The reset circuit that an input end is connected with the reset output pin of described detection chip, the output terminal of described reset circuit is connected with the reset input pin of described control chip, described reset circuit, for receiving described reset signal, generates and exports reseting controling signal to described control chip.
2. hardware watchdog according to claim 1, it is characterized in that, described chip monitoring also for: after receiving the watchdog service delay request message that described control chip sends, reply watchdog service delay characteristic message, and in the second stipulated time section, suspend described transmission of feeding dog request message.
3. hardware watchdog according to claim 1, is characterized in that, described communication interface circuit is serial control interface SCI.
4. hardware watchdog according to claim 1, is characterized in that, described reset circuit is and door.
5. hardware watchdog according to claim 1, is characterized in that, another input end of described reset circuit is connected with reset source.
6. hardware watchdog according to claim 1, is characterized in that, described feeding in dog request message and described low-power consumption mode confirmation message includes CRC.
7. hardware watchdog according to claim 2, is characterized in that, described watchdog service delay characteristic message comprises CRC.
8. hardware watchdog according to claim 1, is characterized in that,
Described first stipulated time section is the requirement duration of the described low-power consumption mode request message that described control chip sends, or
Described first stipulated time section is that the low-power consumption mode preset in described chip monitoring suspends duration.
9. hardware watchdog according to claim 2, is characterized in that,
Described second stipulated time section is the requirement duration of the described watchdog service delay request message that described control chip sends, or
Described second stipulated time section is that the watchdog service delay preset in described chip monitoring suspends duration.
10. a hardware watchdog application circuit, is characterized in that, comprises control chip and the arbitrary described hardware watchdog of claim 1 to 9.
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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 |
| CN107943603A (en) * | 2016-10-13 | 2018-04-20 | 迈普通信技术股份有限公司 | A kind of method for detecting operation state, detection circuit and electronic equipment |
| CN109614261A (en) * | 2018-12-12 | 2019-04-12 | 中国航发南方工业有限公司 | Hardware watchdog circuit and single-chip computer control system with the monitoring of task timing |
| CN110834541A (en) * | 2019-11-15 | 2020-02-25 | 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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