MianQi 发表于 2021-9-17 17:19

[新版中科蓝讯AB32VG1 RISC-V开发板] - 9：WDT

本帖最后由 MianQi 于 2021-9-17 16:37 编辑

<p>参考例程 - https://docs.qq.com/doc/DTVVWWXpLRVl6cER2?_t=1626260921919（第八例）</p>

<p>首先，在项目中的&ldquo;RT-Thread设置&rdquo;中的&ldquo;硬件&rdquo;目录下，打开看门狗定时器：</p>

<p></p>

<p>不做其他任何工作，生成的主程序代码是这样：</p>

<pre>
<code class="language-cpp">#include &lt;rtthread.h&gt;
#include "board.h"

int main(void)
{
    uint8_t pin = rt_pin_get("PE.1");

    rt_pin_mode(pin, PIN_MODE_OUTPUT);
    rt_kprintf("Hello, world\n");

    while (1)
    {
      rt_pin_write(pin, PIN_LOW);
      rt_thread_mdelay(500);
      rt_pin_write(pin, PIN_HIGH);
      rt_thread_mdelay(500);
    }
}
</code></pre>

<p>&nbsp;</p>

<p>在上述主程序中加入两段代码，其一：</p>

<pre>
<code class="language-cpp">rt_device_t watchdog = rt_device_find("wdt");
rt_uint32_t timeout = 4; //设定看门狗2048ms后溢出
rt_device_control(watchdog, RT_DEVICE_CTRL_WDT_SET_TIMEOUT, &amp;timeout);
rt_device_control(watchdog, RT_DEVICE_CTRL_WDT_START, RT_NULL);
</code></pre>

<p>加在&quot;while(1)&quot;之前。</p>

<p>&nbsp;</p>

<p>其二：</p>

<pre>
<code class="language-cpp">rt_device_control(watchdog, RT_DEVICE_CTRL_WDT_KEEPALIVE, NULL);
rt_kprintf("feed dog\n");
</code></pre>

<p>加在&quot;while(1)&quot;里边。</p>

MianQi 发表于 2021-9-17 17:19

本帖最后由 MianQi 于 2021-9-17 17:19 编辑

<p>对教程做的内容补充是，要想看到WDT的效果，需要将这一句：</p>

<pre>
<code class="language-cpp">rt_device_control(watchdog, RT_DEVICE_CTRL_WDT_KEEPALIVE, NULL);</code></pre>

<p>在注释和取消注释之间做一切换，分别观察效果。</p>

<p>&nbsp;</p>

<p>这是加上注释的效果：</p>

<p><iframe allowfullscreen="true" frameborder="0" height="450" src="//player.bilibili.com/player.html?bvid=1Vv411A7tu&amp;page=1" style="background:#eee;margin-bottom:10px;" width="700"></iframe></p>

<p><br />
<iframe allowfullscreen="true" frameborder="0" height="450" src="//player.bilibili.com/player.html?bvid=1pP4y1h7V1&amp;page=1" style="background:#eee;margin-bottom:10px;" width="700"></iframe><br />
&nbsp;</p>

<p>这是取消注释的效果：</p>

<p><iframe allowfullscreen="true" frameborder="0" height="450" src="//player.bilibili.com/player.html?bvid=1Xv411w7Pu&amp;page=1" style="background:#eee;margin-bottom:10px;" width="700"></iframe><br />
&nbsp;</p>

<p><iframe allowfullscreen="true" frameborder="0" height="450" src="//player.bilibili.com/player.html?bvid=1QL411x74m&amp;page=1" style="background:#eee;margin-bottom:10px;" width="700"></iframe><br />
&nbsp;</p>

<p>&nbsp;</p>

freebsder 发表于 2021-9-17 18:07

<p>谢谢分享，看来坑不少。。。</p>

MianQi 发表于 2021-9-17 18:12

freebsder 发表于 2021-9-17 18:07
谢谢分享，看来坑不少。。。

<p>就迄今为止的情况来看，AB32VG1只是开了个头，距离成为&ldquo;RISC-V 时代的 Arduino&rdquo;还有较长的路要走。</p>
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