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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" 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" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/rtp/rtp-key_procedures.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1>
<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 1 minute(s)
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<section class="- topic/section section" id="rtp_key_procedures__section_vyf_m5y_21c" data-ofbid="rtp_key_procedures__section_vyf_m5y_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
<p class="- topic/p p" data-ofbid="d146473e38__20250123155214">RTP 模块完全遵循 driver 的通用初始化流程，申请 regs 资源、clk、reset，
还需要注册一个 input 设备，使用 input 子系统提供的注册接口 input_register_device()：</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtp_key_procedures__pre_wyf_m5y_21c" data-ofbid="rtp_key_procedures__pre_wyf_m5y_21c"><code><strong class="hl-keyword">int</strong> __must_check input_register_device(<strong class="hl-keyword">struct</strong> input_dev *);</code></pre>
<div class="- topic/p p" data-ofbid="d146473e44__20250123155214">参数 dev 记录了该 input 设备的信息，其中关键信息有：设备名称、
open/close 接口、KEY 类型、坐标范围等。RTP 控制器的 input 信息注册如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtp_key_procedures__codeblock_wrs_45y_21c" data-ofbid="rtp_key_procedures__codeblock_wrs_45y_21c"><code>rtp-&gt;idev = idev;
idev-&gt;name = pdev-&gt;name;
idev-&gt;phys = AIC_RTP_NAME <span class="hl-string">"/input0"</span>;
idev-&gt;open = aic_rtp_open;
idev-&gt;close = aic_rtp_close;
idev-&gt;id.bustype = BUS_HOST;
idev-&gt;evbit[<span class="hl-number">0</span>] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
input_set_capability(idev, EV_KEY, BTN_TOUCH);
input_set_abs_params(idev, ABS_X, <span class="hl-number">0</span>, AIC_RTP_MAX_VAL, rtp-&gt;fuzz, <span class="hl-number">0</span>);
input_set_abs_params(idev, ABS_Y, <span class="hl-number">0</span>, AIC_RTP_MAX_VAL, rtp-&gt;fuzz, <span class="hl-number">0</span>);
<strong class="hl-keyword">if</strong> (rtp-&gt;pressure_det)
input_set_abs_params(idev, ABS_PRESSURE, <span class="hl-number">0</span>, AIC_RTP_MAX_VAL,
rtp-&gt;fuzz, <span class="hl-number">0</span>);</code></pre></div>
</section>
<section class="- topic/section section" id="rtp_key_procedures__section_yyf_m5y_21c" data-ofbid="rtp_key_procedures__section_yyf_m5y_21c"><h2 class="- topic/title title sectiontitle">中断处理流程</h2><p class="- topic/p p" data-ofbid="d146473e53__20250123155214">RTP 控制器采集的数据完全依赖中断来上报给用户态，包括触摸位置、按下、抬起信息。 流程如下图：</p><figure class="- topic/fig fig fignone" id="rtp_key_procedures__fig_of1_5fp_g1c" data-ofbid="rtp_key_procedures__fig_of1_5fp_g1c">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="rtp_key_procedures__image_zyf_m5y_21c" src="../../../images/rtp/rtp_irq_flow_lb.png" width="384" alt="irq_flow2"/></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"><em class="+ topic/ph hi-d/i ph i">RTP 驱动的中断处理流程</em></span></figcaption></figure><p class="- topic/p p" data-ofbid="d146473e67__20250123155214">“启动 worker”和“启动 worker”分别是对应手动模式、非周期模式的采样流程，因为这两种情况下都会有一些延迟操作，所以使用 worker 方式来处理。实际运行期间 RTP 只可能工作在一种单一模式，所以运行中只会有一个 worker 在参与调度。</p><p class="- topic/p p" data-ofbid="d146473e69__20250123155214">其中，检查的异常事件类型及处理方式如下图：</p><div class="- topic/p p" data-ofbid="d146473e71__20250123155214"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="rtp_key_procedures__image_azf_m5y_21c" src="../../../images/rtp/abnormal_event_type.png" width="384" alt="abnormal_event_type"/></div><br/></div><p class="- topic/p p" data-ofbid="d146473e77__20250123155214">其中，“数据不完整”仅在自动模式才会出现，实际上有三种原因导致不完整：</p><ol class="- topic/ol ol" id="rtp_key_procedures__ol_bzf_m5y_21c" data-ofbid="rtp_key_procedures__ol_bzf_m5y_21c">
<li class="- topic/li li" data-ofbid="d146473e81__20250123155214">
<p class="- topic/p p" data-ofbid="d146473e83__20250123155214">采样循环不完整：Sample Cycle Incomplete，一组采样点还没有完成就发生了抬起事件。</p>
</li>
<li class="- topic/li li" data-ofbid="d146473e87__20250123155214">
<p class="- topic/p p" data-ofbid="d146473e89__20250123155214">数据超限：Data Over Uncertain Range，数据超出了有效范围。</p>
</li>
<li class="- topic/li li" data-ofbid="d146473e93__20250123155214">
<p class="- topic/p p" data-ofbid="d146473e95__20250123155214">FIFO 下溢：FIFO 上溢意味着数据有效、软件读慢了，所以还可以继续数据。如果是下溢，意味着 FIFO 中的数据分组排列已经乱了，所以直接丢弃。</p>
</li>
</ol></section>
<section class="- topic/section section" id="rtp_key_procedures__section_czf_m5y_21c" data-ofbid="rtp_key_procedures__section_czf_m5y_21c"><h2 class="- topic/title title sectiontitle">手动模式的采样流程</h2>
<p class="- topic/p p" data-ofbid="d146473e105__20250123155214">手动模式，需要通过软件触发的方式告诉 RTP 控制器要采集什么样的数据，所以采集样本的电信号配置、采集间隔、是否打开按压检测等，都需要在驱动中来妥善安排。
因为每次中断来了后，手动模式需要做的处理较多，而且有一些延迟处理，所以在驱动中使用了一个 worker 专门处理手动模式的流程（接口 aic_rtp_manual_worker()）。
手动模式的处理流程较复杂，建议通常情况下采样自动模式。</p>
<figure class="- topic/fig fig fignone" id="rtp_key_procedures__fig_tr4_m5y_21c" data-ofbid="rtp_key_procedures__fig_tr4_m5y_21c">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="rtp_key_procedures__image_dzf_m5y_21c" src="../../../images/rtp/manual_mode.png" alt="manual_mode"/></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"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">手动模式的状态切换流程</span></figcaption></figure>
<p class="- topic/p p" data-ofbid="d146473e120__20250123155214">上图中，在蓝色方框的后面都会有一个判断：如果当前是否抬起状态，如果是就打开按压检测。为了流程的主干更加清晰，所以图中未标注出来。</p>
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<span class="close oxy-icon oxy-icon-remove"></span>
<div id="modal_img_container"></div>
<div id="caption"></div>
</div>
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
</body>
</html>
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