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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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< / 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 >
< 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，
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" > < strong class = "hl-keyword" > int< / strong > __must_check input_register_device(< strong class = "hl-keyword" > struct< / strong > input_dev *);< / pre >
< 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、
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;
idev-> name = pdev-> name;
idev-> phys = AIC_RTP_NAME < span class = "hl-string" > "/input0"< / span > ;
idev-> open = aic_rtp_open;
idev-> close = aic_rtp_close;
idev-> id.bustype = BUS_HOST;
idev-> 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-> 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-> fuzz, < span class = "hl-number" > 0< / span > );
< strong class = "hl-keyword" > if< / strong > (rtp-> pressure_det)
input_set_abs_params(idev, ABS_PRESSURE, < span class = "hl-number" > 0< / span > , AIC_RTP_MAX_VAL,
rtp-> fuzz, < span class = "hl-number" > 0< / span > );< / 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 = "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， ， < / 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" >
< p class = "- topic/p p" data-ofbid = "d131506e63__20250121171605" > 采样循环不完整： ， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d131506e66__20250121171605" >
< p class = "- topic/p p" data-ofbid = "d131506e68__20250121171605" > 数据超限： ， < / p >
< / li > < li class = "- topic/li li" data-ofbid = "d131506e71__20250121171605" >
< p class = "- topic/p p" data-ofbid = "d131506e73__20250121171605" > FIFO 下溢： < / 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 = "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。
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 = "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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