WDT

[English]

1 功能概述

看门狗定时器通常用来监测和处理系统或软件故障。当系统或软件发生某些错误事件时，如不能定时清除看门狗定时器的计数值，将造成看门狗超时，从而触发系统复位。

• WDT相关的理论介绍参考: WDT的驱动

备注

• 1、由于看门狗硬件资源只有一份，所以将其放在了cp上进行管理,若想配置看门狗，需要到CP侧进行 cp/middleware/soc/bk7258/bk7258.defconfig 配置；

• 2、喂狗的操作在CP上进行，如果超过配置的时间没有喂狗，会触发系统重启；

• 3、AP侧没有看门狗，通过核间心跳机制来检测ap是否正常运行；

• 4、AP侧上层应用主动调用bk_reboot接口也可进行复位；

2 代码路径

• demo路径：

  components\bk_cli\cli_wdt.c

• 驱动源码路径：

  ap\middleware\driver\wdt\wdt_driver.c

• WDT相关的api介绍参考: WDT的api介绍

3 cli命令简介

demo运行依赖的宏配置：

NAME	Description	File	value
CONFIG_INT_WDT	support hardware wdt	ap\middleware\soc\bk7258\bk7258.defconfig	y
CONFIG_INT_WDT_PERIOD_MS	Interrupt Watchdog Period(ms)	ap\middleware\soc\bk7258\bk7258.defconfig	8000
CONFIG_TASK_WDT_PERIOD_MS	support software wdt	ap\middleware\soc\bk7258\bk7258.defconfig	y
CONFIG_TASK_WDT_PERIOD_MS	Task Watchdog Period(ms)	ap\middleware\soc\bk7258\bk7258.defconfig	16000
CONFIG_NMI_WDT_EN	support NMI wdt	ap\middleware\soc\bk7258\bk7258.defconfig	y

demo支持的命令如下表：

Command	Param	Description
wdt_driver init	none	init wdt driver control memory
wdt_driver deinit	none	free all resource related to wdt
wdt {start|stop|feed|enable|disable|while}	start:start wdt	start wdt and feed wdt
	stop:stop wdt
	feed: feed wdt
	enable: enable wdt
	disable: disable wdt
	while: wdt while

4 演示介绍

demo1执行的步骤如下：

1、顺序发送以下命令

wdt start 1000

[15:51:06.104]发→◇wdt start 1000
[15:51:06.108]收←◆wdt start 1000
os:I(127743):create shell_handle, tcb=28086ff0, stack=[280853c8-28086fc8:7168], prio=5
$cli:I(127744):wdt start, timeout=1000

wdt feed

[15:51:07.778]发→◇wdt feed
[15:51:07.783]收←◆wdt feed
os:I(129418):create shell_handle, tcb=28086ff0, stack=[280853c8-28086fc8:7168], prio=5
$cli:I(129419):wdt feed

wdt stop

[15:51:27.077]发→◇wdt stop
[15:51:27.081]收←◆wdt stop
os:I(148715):create shell_handle, tcb=28086ff0, stack=[280853c8-28086fc8:7168], prio=5
$cli:I(148716):wdt stop

wdt enable

[15:51:56.072]发→◇wdt enable
[15:51:56.076]收←◆wdt enable
os:I(177710):create shell_handle, tcb=28086ff0, stack=[280853c8-28086fc8:7168], prio=5
$cli:I(177711):wdt debug enabled

wdt disable

[15:51:57.418]发→◇ wdt disable
[15:51:57.423]收←◆ wdt disable
os:I(179056):create shell_handle, tcb=28086ff0, stack=[280853c8-28086fc8:7168], prio=5
$cli:I(179057):wdt debug disabled`