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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/pm/pm_design_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 2 minute(s)
</div><div class="- topic/body body"><p class="- topic/p p" data-ofbid="d55636e19__20250121171519">PM 驱动源码位于 <span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv/pm/</span>。</p><section class="- topic/section section" id="id__pm" data-ofbid="id__pm"><h2 class="- topic/title title sectiontitle">PM 框架和功耗模式</h2>
<p class="- topic/p p" data-ofbid="d55636e29__20250121171519"><span class="- topic/ph ph">Luban-Lite</span> 的 PM 驱动完全遵循 RT-Thread 的 PM 框架。PM
框架将系统的功耗分为多个等级，每个等级对应一个功耗模式，实现对不同功耗模式的管理。</p>
<p class="- topic/p p" data-ofbid="d55636e35__20250121171519">以下是 <span class="- topic/ph ph">Luban-Lite</span> 中各功耗模式的详细描述及其在 <span class="- topic/ph ph">Luban-Lite</span>
中的实现功能：</p>
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_bpv_bjd_bdc" data-ofbid="id__table_bpv_bjd_bdc" data-cols="5"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">功能模式及优先级描述</span></caption><colgroup><col style="width:27.31811697574893%"/><col style="width:7.132667617689016%"/><col style="width:18.33095577746077%"/><col style="width:12.482168330955778%"/><col style="width:34.73609129814551%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_bpv_bjd_bdc__entry__1">功耗模式</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_bpv_bjd_bdc__entry__2">级别</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_bpv_bjd_bdc__entry__3">描述</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_bpv_bjd_bdc__entry__4"><span class="- topic/ph ph">Luban-Lite</span> 是否支持</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_bpv_bjd_bdc__entry__5"><span class="- topic/ph ph">Luban-Lite</span> 实现功能的区别</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__1">PM_SLEEP_MODE_NONE</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__2">0</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__3">系统处于活跃状态</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__4">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__5">
<p class="- topic/p p" data-ofbid="d55636e82__20250121171519">未做任何低功耗处理，系统处于全速运行状态。</p>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__1">PM_SLEEP_MODE_IDLE</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__2">1</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__3">空闲模式</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__4">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__5">
<p class="- topic/p p" data-ofbid="d55636e96__20250121171519">执行 <code class="+ topic/ph pr-d/codeph ph codeph">WFI</code>（Wait For Interrupt）指令，使 CPU
进入空闲状态，等待中断唤醒。</p>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__1">PM_SLEEP_MODE_LIGHT</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__2">2</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__3">轻睡眠模式</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__4">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__5">
<p class="- topic/p p" data-ofbid="d55636e113__20250121171519">执行 <code class="+ topic/ph pr-d/codeph ph codeph">WFI</code> 指令，同时将 CPU 及总线时钟切换到 24 MHz，并关闭 PLL
时钟。</p>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__1">PM_SLEEP_MODE_DEEP</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__2">3</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__3">深睡眠模式</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__4">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__5">执行 <code class="+ topic/ph pr-d/codeph ph codeph">WFI</code> 指令，同时将 CPU 及总线时钟切换到 24 MHz，并关闭 PLL 时钟，将
PSRAM 时钟降频。</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__1">PM_SLEEP_MODE_STANDBY</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__2">4</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__3">待机模式</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__4">否</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_bpv_bjd_bdc__entry__5">-</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_bpv_bjd_bdc__entry__1">PM_SLEEP_MODE_SHUTDOWN</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_bpv_bjd_bdc__entry__2">5</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_bpv_bjd_bdc__entry__3">关机模式</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_bpv_bjd_bdc__entry__4">否</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_bpv_bjd_bdc__entry__5">-</td></tr></tbody></table></div>
</section><section class="- topic/section section" id="id__section_yxq_jy1_ddc" data-ofbid="id__section_yxq_jy1_ddc"><h2 class="- topic/title title sectiontitle">申请和释放功耗模式</h2>
<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">API 接口</strong><div class="- topic/p p" data-ofbid="d55636e164__20250121171519">为了管理功耗模式，RT-Thread 提供了一组 API 接口，用于申请和释放不同的功耗模式。<div class="- topic/note note note note_note" id="id__note_tkd_1bb_ddc" data-ofbid="id__note_tkd_1bb_ddc"><span class="note__title">注：</span> PM
框架中功耗模式的申请和释放必须成对使用，否则可能导致系统无法正确管理功耗状态。</div></div><ul class="- topic/ul ul" id="id__ul_ssw_ynv_hdc" data-ofbid="id__ul_ssw_ynv_hdc"><li class="- topic/li li" data-ofbid="d55636e170__20250121171519">
<div class="- topic/p p" data-ofbid="d55636e174__20250121171519">PM
框架提供的申请休眠模式的接口有：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_bjm_sz1_ddc" data-ofbid="id__codeblock_bjm_sz1_ddc">rt_pm_release(rt_uint8_t mode)
rt_pm_module_request(uint8_t module_id, rt_uint8_t sleep_mode)
rt_pm_sleep_request(rt_uint16_t module_id, rt_uint8_t mode)
rt_pm_sleep_none_request(rt_uint16_t module_id)
rt_pm_sleep_idle_request(rt_uint16_t module_id)
rt_pm_sleep_light_request(rt_uint16_t module_id)</pre></div>
</li><li class="- topic/li li" data-ofbid="d55636e182__20250121171519">
<div class="- topic/p p" data-ofbid="d55636e184__20250121171519">释放休眠模式的接口有:<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_hqx_sz1_ddc" data-ofbid="id__codeblock_hqx_sz1_ddc">rt_pm_release(rt_uint8_t sleep_mode)
rt_pm_module_release(uint8_t module_id, rt_uint8_t sleep_mode)
rt_pm_module_release_all(uint8_t module_id, rt_uint8_t sleep_mode)
rt_pm_sleep_release(rt_uint16_t module_id, rt_uint8_t mode)
rt_pm_sleep_none_release(rt_uint16_t module_id)
rt_pm_sleep_idle_release(rt_uint16_t module_id)
rt_pm_sleep_light_release(rt_uint16_t module_id)</pre></div>
</li><li class="- topic/li li" data-ofbid="d55636e189__20250121171519">
<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b"><code class="+ topic/ph pr-d/codeph ph codeph">module_id</code></strong><div class="- topic/p p" data-ofbid="d55636e195__20250121171519">RT-Thread 官方推荐使用基于
<code class="+ topic/ph pr-d/codeph ph codeph">module_id</code> 的 API
接口，用于申请和释放功耗模式。使用这些接口可以查看申请功耗的模块，也方便调试。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_wtb_5z1_ddc" data-ofbid="id__codeblock_wtb_5z1_ddc">rt_pm_module_request(uint8_t module_id, rt_uint8_t sleep_mode) <em class="hl-comment">// 申请进入指定的功耗模式</em>
rt_pm_module_release(uint8_t module_id, rt_uint8_t sleep_mode) <em class="hl-comment">// 释放指定的功耗模式</em></pre></div><p class="- topic/p p" data-ofbid="d55636e202__20250121171519"><code class="+ topic/ph pr-d/codeph ph codeph">module_id</code>
是在 <span class="+ topic/ph sw-d/filepath ph filepath">pm_cfg.h</span> 文件中定义的，用于表示不同的模块。开发者可以根据实际需求自行定义
<code class="+ topic/ph pr-d/codeph ph codeph">module_id</code>，以便更好地管理和调试功耗模式。</p></div>
</li></ul></div>
<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">申请和释放规则</strong><div class="- topic/p p" data-ofbid="d55636e219__20250121171519">当有多个线程或任务同时申请不同的功耗模式时，RT-Thread PM 框架会根据以下规则决定当前系统应运行在哪个功耗模式下：<ol class="- topic/ol ol" id="id__ol_oh4_ry1_ddc" data-ofbid="id__ol_oh4_ry1_ddc"><li class="- topic/li li" data-ofbid="d55636e222__20250121171519"><strong class="+ topic/ph hi-d/b ph b">最高优先级的模式优先</strong>：如果某个线程申请了 <code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_NONE</code>
模式，而另一个线程申请了 <code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_DEEP</code> 模式，则系统会以
<code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_NONE</code> 模式运行，直到所有申请
<code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_NONE</code> 模式的任务都释放了这个模式，系统才会切换到
<code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_DEEP</code> 模式，进入 deep sleep
mode。<p class="- topic/p p" data-ofbid="d55636e242__20250121171519">RT-Thread
的功耗模式需要在代码中主动申请和释放，为了保证系统的正常运行，功耗越大的模式优先级越高。</p></li><li class="- topic/li li" data-ofbid="d55636e244__20250121171519"><strong class="+ topic/ph hi-d/b ph b">默认休眠模式</strong>：在 PM 框架初始化时，将 <code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_DEEP</code>
设置为默认休眠模式。如果没有比 <code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_DEEP</code> 更高优先级的请求，系统会立刻进入
deep sleep mode。</li><li class="- topic/li li" data-ofbid="d55636e254__20250121171519"><strong class="+ topic/ph hi-d/b ph b">初始化时的默认模式</strong>：PM 框架初始化时会申请 <code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_NONE</code>
模式，以确保在 PM 初始化完成后，系统可以正常运行，而不会立即进入 deep sleep
mode。因此，在应用代码中，想要进入低功耗模式，需要主动调用 release 相关的 API 接口释放
<code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_NONE</code> 模式。</li></ol></div></div>
</section><section class="- topic/section section" id="id__id2" data-ofbid="id__id2"><h2 class="- topic/title title sectiontitle">休眠唤醒流程</h2>
<div class="- topic/p p" data-ofbid="d55636e272__20250121171519">PM 框架休眠唤醒流程如下：<figure class="- topic/fig fig fignone" id="id__fig_u1q_zy1_ddc" data-ofbid="id__fig_u1q_zy1_ddc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_dpv_bjd_bdc" src="../../../images/pm/suspend_resume_flow.png" alt="suspend_resume_flow"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">休眠唤醒流程</span></figcaption></figure>
</div>
<p class="- topic/p p" data-ofbid="d55636e283__20250121171519">如上图所示，PM 框架及驱动使能后，RT-Thread 会在 idle 线程进入休眠唤醒流程。在休眠唤醒流程中，PM
框架会检查所有正在运行的任务和线程，确定当前系统中申请的最高优先级的功耗模式，并以最高优先级的功耗模式运行。例如，如果最高优先级是
<code class="+ topic/ph pr-d/codeph ph codeph">PM_SLEEP_MODE_DEEP</code>，系统将进入 deep sleep mode。</p>
<div class="- topic/note note note note_note" id="id__note_egr_d1b_ddc" data-ofbid="id__note_egr_d1b_ddc"><span class="note__title">注：</span> 功耗越高，优先级越高。</div>
<p class="- topic/p p" data-ofbid="d55636e292__20250121171519">在低功耗模式 ( deep sleep mode)
下，系统会等待外部中断或特定事件来触发唤醒。当外部中断或事件触发时，系统会退出低功耗模式，恢复到工作状态，继续执行被中断的任务或线程。</p>
</section><section class="- topic/section section" id="id__id3" data-ofbid="id__id3"><h2 class="- topic/title title sectiontitle">代码段保护</h2>
<div class="- topic/p p" data-ofbid="d55636e303__20250121171519">在 RT-Thread 的 PM
框架中，通过申请和释放功耗模式来保护代码段，确保在特定阶段不允许系统进入低功耗模式。例如，如果在读取数据过程中不允许进入休眠，则执行代码段保护的流程如下：<div class="- topic/note note note note_note" id="id__note_z3k_r1b_ddc" data-ofbid="id__note_z3k_r1b_ddc"><span class="note__title">注：</span> PM 框架中模式的申请和释放必须成对使用。</div><ol class="- topic/ol ol" id="id__ol_vpd_gbb_ddc" data-ofbid="id__ol_vpd_gbb_ddc"><li class="- topic/li li" data-ofbid="d55636e308__20250121171519">通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">rt_pm_module_request</span>
函数申请不进入任何低功耗模式。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_zy5_hbb_ddc" data-ofbid="id__codeblock_zy5_hbb_ddc">rt_pm_module_request(PM_MAIN_ID, PM_SLEEP_MODE_NONE);</pre></li><li class="- topic/li li" data-ofbid="d55636e315__20250121171519">等待执行读取数据的操作。</li><li class="- topic/li li" data-ofbid="d55636e317__20250121171519">通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">rt_pm_module_release</span>
函数释放不进入任何低功耗模式的请求。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_wnz_r1b_ddc" data-ofbid="id__codeblock_wnz_r1b_ddc">rt_pm_module_release(PM_MAIN_ID, PM_SLEEP_MODE_NONE);</pre></li></ol></div>
</section><section class="- topic/section section" id="id__id4" data-ofbid="id__id4"><h2 class="- topic/title title sectiontitle">设置唤醒源</h2>
<div class="- topic/p p" data-ofbid="d55636e331__20250121171519"><span class="- topic/ph ph">Luban-Lite</span> SDK 在 PM 框架基础上增加了设置唤醒源的接口，中断唤醒源可以唤醒系统。通过以下接口，可以设置对应的唤醒源：<ul class="- topic/ul ul" id="id__ul_i1f_jcb_ddc" data-ofbid="id__ul_i1f_jcb_ddc"><li class="- topic/li li" data-ofbid="d55636e336__20250121171519"><span class="+ topic/keyword pr-d/apiname keyword apiname">rt_device_wakeup_enable(rt_device_t dev, rt_bool_t
enable)</span>：用来设置普通外设作为唤醒源，包括 RTC、I2C 和 SPI 等。这类设备在 RR-Thread 中采用
<code class="+ topic/ph pr-d/codeph ph codeph">rt_device</code> 描述设备。</li><li class="- topic/li li" data-ofbid="d55636e343__20250121171519"><span class="+ topic/keyword pr-d/apiname keyword apiname">rt_pm_set_pin_wakeup_source(rt_base_t pin)</span>：用来设置某个 GPIO
引脚作为唤醒源。<p class="- topic/p p" data-ofbid="d55636e347__20250121171519">在 RT-Thread 中，采用 <code class="+ topic/ph pr-d/codeph ph codeph">rt_base_t</code> 描述一个具体的 GPIO
口，而没有采用 rt_device 描述，因此需要一个单独的接口来设置 GPIO
的唤醒源。</p></li></ul></div>
</section><section class="- topic/section section" id="id__id5" data-ofbid="id__id5"><h2 class="- topic/title title sectiontitle">低功耗定时器</h2>
<p class="- topic/p p" data-ofbid="d55636e361__20250121171519">系统中没有专用的低功耗定时器，<span class="- topic/ph ph">Luban-Lite</span> SDK 通过利用 CPU 的计时器 MTIME
来实现低功耗定时器。详细的实现原理和步骤如下所示：</p>
<ol class="- topic/ol ol arabic simple" id="id__ol_lpv_bjd_bdc" data-ofbid="id__ol_lpv_bjd_bdc"><li class="- topic/li li" data-ofbid="d55636e368__20250121171519">
<p class="- topic/p p" data-ofbid="d55636e370__20250121171519">修改 MTIME 的比较值寄存器，减少中断的周期性触发，从而实现 tickless 的目的。</p>
</li><li class="- topic/li li" data-ofbid="d55636e373__20250121171519">
<p class="- topic/p p" data-ofbid="d55636e375__20250121171519">获取低功耗定时器的下一次超时时间，然后加上当前的 MTIME 的计数值，再将结果写入 MTIME 的比较值寄存器。</p>
</li><li class="- topic/li li" data-ofbid="d55636e378__20250121171519">
<p class="- topic/p p" data-ofbid="d55636e380__20250121171519">当系统从低功耗模式唤醒时，需要计算 MTIME 当前计数值和休眠前计数值的差值，并将该差值补偿到 rt_tick 中。</p>
</li><li class="- topic/li li" data-ofbid="d55636e383__20250121171519">
<p class="- topic/p p" data-ofbid="d55636e385__20250121171519">在系统唤醒后，需要恢复 MTIME 的周期性触发计数。</p>
</li></ol>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#id__pm" data-tocid="id__pm">PM 框架和功耗模式</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_yxq_jy1_ddc" data-tocid="id__section_yxq_jy1_ddc">申请和释放功耗模式</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id2" data-tocid="id__id2">休眠唤醒流程</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id3" data-tocid="id__id3">代码段保护</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id4" data-tocid="id__id4">设置唤醒源</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id5" data-tocid="id__id5">低功耗定时器</a></div></li></ul></div>
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