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watchdogoverview.md 5.50 KB

# Watchdog Overview<a name="EN-US_TOPIC_0000001052935969"></a>

-   [Introduction](#section3579126111816)
-   [Available APIs](#section17429111981812)

## Introduction<a name="section3579126111816"></a>

A watchdog, also called a watchdog timer, is a hardware timing device. If an error occurs in the main program of the system and fails to reset the watchdog timer, the watchdog timer sends a reset signal to restore the system to a normal state.

## Available APIs<a name="section17429111981812"></a>

**Table  1**  Watchdog APIs

<a name="table1731550155318"></a>
<table><thead align="left"><tr id="row4419501537"><th class="cellrowborder" valign="top" width="26.619999999999997%" id="mcps1.2.4.1.1"><a name="p641050105320"></a><a name="p641050105320"></a>Capability
</th>
<th class="cellrowborder" valign="top" width="32.800000000000004%" id="mcps1.2.4.1.2"><a name="p54150165315"></a><a name="p54150165315"></a>Function
</th>
<th class="cellrowborder" valign="top" width="40.58%" id="mcps1.2.4.1.3"><a name="p941150145313"></a><a name="p941150145313"></a>Description
</th>
</tr>
</thead>
<tbody><tr id="row837081981712"><td class="cellrowborder" rowspan="2" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><a name="p681292481718"></a><a name="p681292481718"></a>Open/Close
</td>
<td class="cellrowborder" valign="top" width="32.800000000000004%" headers="mcps1.2.4.1.2 "><a name="p183701419141710"></a><a name="p183701419141710"></a>WatchdogOpen
</td>
<td class="cellrowborder" valign="top" width="40.58%" headers="mcps1.2.4.1.3 "><a name="p17370161911710"></a><a name="p17370161911710"></a>Opens a watchdog.
</td>
</tr>
<tr id="row5610415171719"><td class="cellrowborder" valign="top" headers="mcps1.2.4.1.1 "><a name="p661171510173"></a><a name="p661171510173"></a>WatchdogClose
</td>
<td class="cellrowborder" valign="top" headers="mcps1.2.4.1.2 "><a name="p11611715161713"></a><a name="p11611715161713"></a>Closes a watchdog.
</td>
</tr>
<tr id="row337105133315"><td class="cellrowborder" rowspan="2" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><a name="p07631557153319"></a><a name="p07631557153319"></a>Start/Stop
</td>
<td class="cellrowborder" valign="top" width="32.800000000000004%" headers="mcps1.2.4.1.2 "><a name="p163765113337"></a><a name="p163765113337"></a>WatchdogStart
</td>
<td class="cellrowborder" valign="top" width="40.58%" headers="mcps1.2.4.1.3 "><a name="p18376517332"></a><a name="p18376517332"></a>Starts a watchdog.
</td>
</tr>
<tr id="row18399184610337"><td class="cellrowborder" valign="top" headers="mcps1.2.4.1.1 "><a name="p1740010461335"></a><a name="p1740010461335"></a>WatchdogStop
</td>
<td class="cellrowborder" valign="top" headers="mcps1.2.4.1.2 "><a name="p19400194633318"></a><a name="p19400194633318"></a>Stops a watchdog.
</td>
</tr>
<tr id="row34145016535"><td class="cellrowborder" rowspan="2" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><a name="p229610227124"></a><a name="p229610227124"></a>Timeout duration
</td>
<td class="cellrowborder" valign="top" width="32.800000000000004%" headers="mcps1.2.4.1.2 "><a name="p8296182221219"></a><a name="p8296182221219"></a>WatchdogSetTimeout
</td>
<td class="cellrowborder" valign="top" width="40.58%" headers="mcps1.2.4.1.3 "><a name="p16297172213125"></a><a name="p16297172213125"></a>Sets the watchdog timeout duration.
</td>
</tr>
<tr id="row11585016539"><td class="cellrowborder" valign="top" headers="mcps1.2.4.1.1 "><a name="p1095722493616"></a><a name="p1095722493616"></a>WatchdogGetTimeout
</td>
<td class="cellrowborder" valign="top" headers="mcps1.2.4.1.2 "><a name="p15297162215122"></a><a name="p15297162215122"></a>Obtains the watchdog timeout duration.
</td>
</tr>
<tr id="row105701653185811"><td class="cellrowborder" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><a name="p2571145325819"></a><a name="p2571145325819"></a>Status
</td>
<td class="cellrowborder" valign="top" width="32.800000000000004%" headers="mcps1.2.4.1.2 "><a name="p175711953195814"></a><a name="p175711953195814"></a>WatchdogGetStatus
</td>
<td class="cellrowborder" valign="top" width="40.58%" headers="mcps1.2.4.1.3 "><a name="p331961319210"></a><a name="p331961319210"></a>Obtains the watchdog status.
</td>
</tr>
<tr id="row1028182217215"><td class="cellrowborder" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><a name="p182818227214"></a><a name="p182818227214"></a>Feeding
</td>
<td class="cellrowborder" valign="top" width="32.800000000000004%" headers="mcps1.2.4.1.2 "><a name="p17281223219"></a><a name="p17281223219"></a>WatchdogFeed
</td>
<td class="cellrowborder" valign="top" width="40.58%" headers="mcps1.2.4.1.3 "><a name="p62815221125"></a><a name="p62815221125"></a>Feeds a watchdog, or resets a watchdog timer.
</td>
</tr>
</tbody>
</table>

>![](public_sys-resources/icon-note.gif) **NOTE:** 
>All watchdog functions provided in this document can be called only in kernel mode.

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提交于 2021-03-12 17:59 . !197 Docs Update version 1.0.1

Watchdog Overview

Introduction
Available APIs

Introduction

Available APIs

Table 1 Watchdog APIs

Capability	Function	Description
Open/Close	WatchdogOpen	Opens a watchdog.
Open/Close	WatchdogClose	Closes a watchdog.
Start/Stop	WatchdogStart	Starts a watchdog.
Start/Stop	WatchdogStop	Stops a watchdog.
Timeout duration	WatchdogSetTimeout	Sets the watchdog timeout duration.
Timeout duration	WatchdogGetTimeout	Obtains the watchdog timeout duration.
Status	WatchdogGetStatus	Obtains the watchdog status.
Feeding	WatchdogFeed	Feeds a watchdog, or resets a watchdog timer.

NOTE: All watchdog functions provided in this document can be called only in kernel mode.

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