CN206270937U - A kind of hardware watchdog circuit suitable for operating system - Google Patents
A kind of hardware watchdog circuit suitable for operating system Download PDFInfo
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- CN206270937U CN206270937U CN201621038664.8U CN201621038664U CN206270937U CN 206270937 U CN206270937 U CN 206270937U CN 201621038664 U CN201621038664 U CN 201621038664U CN 206270937 U CN206270937 U CN 206270937U
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Abstract
The utility model provides a kind of hardware watchdog circuit suitable for operating system, it is characterised in that：The hardware watchdog circuit suitable for operating system includes watchdog chip U1, three state buffer U2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, magnetic bead FB1, the electric capacity C2, electric capacity C3, electric capacity C4 are filter capacitor, influence of the High-frequency Interference to power supply can be filtered, power-supply fluctuation is prevented；Electric capacity C1 strobes.Hardware watchdog circuit suitable for operating system disclosed in the utility model, it is ensured that the MCU of tape operation system can normally start, and with watchdog function, it is ensured that when system breaks down, can recover automatically.The cost of on-site maintenance can be reduced, and improves the stability of product, improve the satisfaction of client.
Description
Technical field
The utility model is related to the technical field of distribution automation, more particularly to a kind of hardware suitable for operating system to see
Door dog circuit.
Background technology
Typically in the microcomputer system being made up of MCU (ARM, DSP, FPGA etc.), MCU operationally can often be subject to
Interference from external electromagnetic field, causes program fleet, system is absorbed in endless loop, causes whole system to be absorbed in dead state,
The unpredictable consequence of generation.For the consideration that real-time monitoring is carried out to MCU running statuses, just generate a kind of dedicated for prison
Survey the chip of MCU running statuses, referred to as hardware watchdog.
Hardware watchdog is that, using a timer circuit, its timing output is connected to the reset terminal of MCU, and program is certain
Timer is reset in time range (be commonly called as " feeding dog ").In program normal work, timer can not always overflow, and also cannot
Produce reset signal；If program breaks down, do not reset house dog in timing cycle, allows for WatchDog Timer spilling
Produce reset signal and make MCU reset restarting programs, MCU is recovered normal work.
When MCU band embedded OSs, in operating system initialization system, it is impossible to normally feed dog, can cause to see
Door dog resets, and causes CPU normally to start.Therefore need to set special hardware watchdog circuit, watchdog function is existed
Closed in embedded OS initialization procedure, waited after the completion of system initialization, system is enabled and seen again when can normally feed dog
Door dog function.
Utility model content
The purpose of this utility model is to provide the hardware watchdog circuit suitable for operating system, solves traditional insertion
Formula operating system is in operating system initialization system, it is impossible to normally feeds dog, can cause watchdog reset, causes the CPU can not be just
The problems such as often starting.
The utility model provides a kind of hardware watchdog circuit suitable for operating system, it is characterised in that：It is described to be applicable
In operating system hardware watchdog circuit include watchdog chip U1, three state buffer U2, resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, magnetic bead FB 1, the electric capacity C2,
Electric capacity C3, electric capacity C4 are filter capacitor, can filter influence of the High-frequency Interference to power supply, prevent power-supply fluctuation；Resistance R3, power supply R5
Play partial pressure；Resistance R1, resistance R2, resistance R4 are terminating resistor, play characteristic matching and buffering signal fluctuation；Electricity
Resistance R6, R7 are pull-up resistor；Electric capacity C1 strobes.
Preferably, the watchdog chip U1 includes PFI pins, PFO pins, and the PFI pins detect voltage and are less than
During threshold value, the pin PFO exports low level, and MCU can judge the change of power supply by detecting the level of the pin PFO
Change, and then make corresponding operation.
Preferably, three state buffer U2 include OE pins, WDI mouthfuls, when in embedded OS power up initialization process,
The OE pins are pulled up through resistance R7, and OE pins are high level, and three state buffer U2 is output as high-impedance state, watchdog chip U1
Watchdog function is not enabled on, and dog is not fed now, ensure that embedded OS normal initialization；Work as embedded OS
After the completion of initialization, OE pins output low level, three state buffer U2 output pins output is changed into non-high-impedance state, output level with
WDI mouthfuls of level is consistent, and now watchdog chip U1 enables watchdog function, controls WDI mouthfuls to feed dog by embedded OS,
When embedded OS crashes, it is impossible to normally feed dog, watchdog chip U1 will export reset signal to MCU, make insertion
Formula operating system resets, and operating system is normally run again.
The hardware watchdog circuit suitable for operating system that the utility model is provided has advantages below：
1st, the hardware watchdog circuit suitable for operating system disclosed in the utility model, makes watchdog function in insertion
Closed during formula operating system initialization, waited after the completion of system initialization, system enables house dog again when can normally feed dog
Function.
2nd, the hardware watchdog circuit suitable for operating system disclosed in the utility model, it is ensured that tape operation system
MCU can normally start, and with watchdog function, it is ensured that when system breaks down, can recover automatically.
3rd, the hardware watchdog circuit suitable for operating system disclosed in the utility model, it is possible to reduce on-site maintenance
Cost, and the stability of product is improved, improve the satisfaction of client.
Brief description of the drawings
Fig. 1 is the organigram of the hardware watchdog circuit suitable for operating system described in the utility model.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below by accompanying drawing and implementation
Example, is described in further detail to the technical solution of the utility model.It should be appreciated that specific reality described herein
Apply example to be only used for explaining principle of the present utility model, be not used to limit the utility model.
The utility model provides a kind of hardware watchdog circuit suitable for operating system, as shown in figure 1, described be applied to
The hardware watchdog circuit of operating system includes watchdog chip U1, three state buffer U2, resistance R1, resistance R2, resistance R3, electricity
Resistance R4, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, magnetic bead FB 1, the electric capacity C2, electricity
It is filter capacitor to hold C3, electric capacity C4, can filter influence of the High-frequency Interference to power supply, prevents power-supply fluctuation；Resistance R3, power supply R5 rise
The effect of partial pressure；Resistance R1, resistance R2, resistance R4 are terminating resistor, play characteristic matching and buffering signal fluctuation；Resistance
R6, R7 are pull-up resistor；Electric capacity C1 strobes.
Preferably, the watchdog chip U1 includes PFI pins, PFO pins, and the PFI pins detect voltage and are less than
During threshold value, the pin PFO exports low level, and MCU can judge the change of power supply by detecting the level of the pin PFO
Change, and then make corresponding operation.
Preferably, three state buffer U2 include OE pins, WDI mouthfuls, when in embedded OS power up initialization process,
The OE pins are pulled up through resistance R7, and OE pins are high level, and three state buffer U2 is output as high-impedance state, watchdog chip U1
Watchdog function is not enabled on, and dog is not fed now, ensure that embedded OS normal initialization；Work as embedded OS
After the completion of initialization, OE pins output low level, three state buffer U2 output pins output is changed into non-high-impedance state, output level with
WDI mouthfuls of level is consistent, and now watchdog chip U1 enables watchdog function, controls WDI mouthfuls to feed dog by embedded OS,
When embedded OS crashes, it is impossible to normally feed dog, watchdog chip U1 will export reset signal to MCU, make insertion
Formula operating system resets, and operating system is normally run again.
Hardware watchdog circuit suitable for operating system disclosed in the utility model, makes watchdog function embedded
Closed during operating system initialization, waited after the completion of system initialization, system enables house dog work(again when can normally feed dog
Can, it is ensured that the MCU of tape operation system can normally start, and with watchdog function, it is ensured that when system breaks down, can be with
It is automatic to recover.The cost of on-site maintenance can be reduced, and improves the stability of product, improve the satisfaction of client.
Above-described specific embodiment, is entered to the purpose of this utility model, technical scheme and beneficial effect
One step is described in detail.The utility model still has numerous embodiments, all use equivalents or equivalent transformation and the institute that is formed
There is technical scheme, all fall within protection domain of the present utility model.
Claims (3)
1. a kind of hardware watchdog circuit suitable for operating system, it is characterised in that：The hardware suitable for operating system
Watchdog circuit includes watchdog chip U1, three state buffer U2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity
Resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, magnetic bead FB1, the electric capacity C2, electric capacity C3, electric capacity C4 are filter
Ripple electric capacity, can filter influence of the High-frequency Interference to power supply, prevent power-supply fluctuation；Resistance R3, power supply R5 play partial pressure；Resistance
R1, resistance R2, resistance R4 are terminating resistor, play characteristic matching and buffering signal fluctuation；Resistance R6, R7 are pull-up electricity
Resistance；Electric capacity C1 strobes.
2. the hardware watchdog circuit suitable for operating system according to claim 1, it is characterised in that：The house dog
Chip U1 includes PFI pins, PFO pins, and when the PFI pins detect voltage less than threshold value, the pin PFO outputs are low
Level, MCU can judge the change of power supply by detecting the level of the pin PFO, and then make corresponding operation.
3. the hardware watchdog circuit suitable for operating system according to claim 1, it is characterised in that：Three state buffer
U2 include OE pins, WDI mouthful, when in embedded OS power up initialization process, the OE pins are through resistance R7 pull-up, OE
Pin is high level, and three state buffer U2 is output as high-impedance state, and watchdog chip U1 watchdog functions are not enabled on, and is not fed now
Dog, ensure that embedded OS normal initialization；After the completion of embedded OS initialization, the output of OE pins is low
Level, three state buffer U2 output pins output is changed into non-high-impedance state, and output level is consistent with WDI mouthfuls of level, now house dog
Chip U1 enables watchdog function, controls WDI mouthfuls to feed dog by embedded OS, when embedded OS crashes, no
Dog can be normally fed, watchdog chip U1 will export reset signal to MCU, embedded OS is resetted, and make operating system
Again normal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621038664.8U CN206270937U (en) | 2016-09-05 | 2016-09-05 | A kind of hardware watchdog circuit suitable for operating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621038664.8U CN206270937U (en) | 2016-09-05 | 2016-09-05 | A kind of hardware watchdog circuit suitable for operating system |
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| Publication Number | Publication Date |
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| CN206270937U true CN206270937U (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621038664.8U Active CN206270937U (en) | 2016-09-05 | 2016-09-05 | A kind of hardware watchdog circuit suitable for operating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965412A (en) * | 2021-02-02 | 2021-06-15 | 广州大学华软软件学院 | MCU unit resetting method and system and CAN anti-interference communication device |
-
2016
- 2016-09-05 CN CN201621038664.8U patent/CN206270937U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965412A (en) * | 2021-02-02 | 2021-06-15 | 广州大学华软软件学院 | MCU unit resetting method and system and CAN anti-interference communication device |
| CN112965412B (en) * | 2021-02-02 | 2022-02-22 | 广州大学华软软件学院 | MCU unit resetting method and system and CAN anti-interference communication device |
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