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Watchdog circuit used for embedded system

A watchdog and embedded technology, applied in the field of watchdog circuits, can solve problems such as underlying function errors and increase the workload of application layer developers

Active Publication Date: 2014-04-09
SIEMENS POWER AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the underlying functional modules such as drivers are usually provided by independent suppliers. Generally, application developers do not need or have the ability to modify the code of the underlying functional modules, because modifying the underlying functional modules is likely to cause Errors in the underlying functions, and increase the unnecessary workload of application layer developers

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  • Watchdog circuit used for embedded system
  • Watchdog circuit used for embedded system
  • Watchdog circuit used for embedded system

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Embodiment Construction

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0023] Given figure 1 To overcome the defects of the watchdog circuit shown, the inventors of the present invention have proposed a novel watchdog (WD) circuit. This kind of WD circuit can automatically send a valid wake-up signal to the WD chip during the system SYS startup period (or preferably during the firmware update period) to keep the WD from overtime. After the application program on the system SYS takes over the system, the application program continues to The wake-up code in the program generates a wake-up signal S4 on the I / O port of the system SYS to keep WD from overtime.

[0024] figure 2 A block diagram of a WD wake-up device 200 according to an embodiment of the present invention is exemplarily shown. Such as...

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Abstract

The invention provides a watchdog circuit used for embedded system. The circuit comprises a watchdog unit (210), an awakening signal generating unit (220), and an awakening control unit (240). The awakening signal generating unit (220) responds an enable signal (S2) to selectively select awakening clock signals (S1) or normal awakening signals (S4) from a system (SYS) as awakening signals (S5) to send to the watchdog unit (210). The awakening control unit (240) is generated in a system starting time frame (T1) as the enable signal 9S2) with effective value. The awakening signal generating unit (220) takes the awakening clock signals (S1) as the awakening signals (S5) to send to the watchdog unit (210) when the enable signal (S2) is in effect.

Description

technical field [0001] The present invention generally relates to an embedded hardware system, in particular to a watchdog circuit used in the embedded hardware system. Background technique [0002] Watchdog (WD for short) is actually a kind of timer, which is usually used to monitor whether a program in a software system or embedded hardware system is running normally. If the program of the system is running normally, the system can reset the timeout period (t WD )) Internally sends a waking signal (commonly known as a "feeding" signal) to the WD (for example, a falling edge or a rising edge), causing the WD to reset and re-time. On the contrary, if the system fails to send a wake-up signal due to a program failure within the WD reset timeout period, the WD will send a reset signal due to the timeout of the timer, thereby forcing the system to restart, thereby preventing the system from crashing or entering an endless loop. [0003] In general, WD can be realized by hardw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/00
Inventor θƒ‘ε–œε“θΆŠ
Owner SIEMENS POWER AUTOMATION