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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" 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">3 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><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>
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<p class="- topic/p p" data-ofbid="d131506e27__20250121171605">RTP 模块完全遵循 driver 的通用初始化流程，申请 regs 资源、clk、reset，
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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>
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<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"><strong class="hl-keyword">int</strong> __must_check input_register_device(<strong class="hl-keyword">struct</strong> input_dev *);</pre>
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<div class="- topic/p p" data-ofbid="d131506e33__20250121171605">参数 dev 记录了该 input 设备的信息，其中关键信息有：设备名称、
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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">rtp->idev = idev;
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idev->name = pdev->name;
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idev->phys = AIC_RTP_NAME <span class="hl-string">"/input0"</span>;
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idev->open = aic_rtp_open;
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idev->close = aic_rtp_close;
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idev->id.bustype = BUS_HOST;
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idev->evbit[<span class="hl-number">0</span>] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
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input_set_capability(idev, EV_KEY, BTN_TOUCH);
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input_set_abs_params(idev, ABS_X, <span class="hl-number">0</span>, AIC_RTP_MAX_VAL, rtp->fuzz, <span class="hl-number">0</span>);
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input_set_abs_params(idev, ABS_Y, <span class="hl-number">0</span>, AIC_RTP_MAX_VAL, rtp->fuzz, <span class="hl-number">0</span>);
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<strong class="hl-keyword">if</strong> (rtp->pressure_det)
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input_set_abs_params(idev, ABS_PRESSURE, <span class="hl-number">0</span>, AIC_RTP_MAX_VAL,
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rtp->fuzz, <span class="hl-number">0</span>);</pre></div>
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</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="d131506e41__20250121171605">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="d131506e50__20250121171605">“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="d131506e52__20250121171605">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="d131506e54__20250121171605"><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="d131506e58__20250121171605">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="d131506e61__20250121171605">
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<p class="- topic/p p" data-ofbid="d131506e63__20250121171605">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>
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</li><li class="- topic/li li" data-ofbid="d131506e66__20250121171605">
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<p class="- topic/p p" data-ofbid="d131506e68__20250121171605">数据超限：Data Over Uncertain Range，数据超出了有效范围。</p>
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</li><li class="- topic/li li" data-ofbid="d131506e71__20250121171605">
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<p class="- topic/p p" data-ofbid="d131506e73__20250121171605">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>
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</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>
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<p class="- topic/p p" data-ofbid="d131506e81__20250121171605">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。
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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()）。
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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>
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<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>
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<p class="- topic/p p" data-ofbid="d131506e91__20250121171605">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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<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="#rtp_key_procedures__section_vyf_m5y_21c" data-tocid="rtp_key_procedures__section_vyf_m5y_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#rtp_key_procedures__section_yyf_m5y_21c" data-tocid="rtp_key_procedures__section_yyf_m5y_21c">中断处理流程</a></div></li><li class="section-item"><div class="section-title"><a href="#rtp_key_procedures__section_czf_m5y_21c" data-tocid="rtp_key_procedures__section_czf_m5y_21c">手动模式的采样流程</a></div></li></ul></div>
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