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class="shortdesc">GE、VE、Display、DVP、MPP、MPP 播放器等多媒体模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="concept_nww_hzh_pzb-d4445e5947" class="topicref" data-id="concept_nww_hzh_pzb" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action concept_nww_hzh_pzb-d4445e5947-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d4445e5947-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" aria-expanded="false"><div data-tocid="can-d4445e5964" class="topicref" data-id="can" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action can-d4445e5964-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/can/can_user_guide.html" 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href="../../../topics/sdk/cir/cir_debug.html" id="cir_debug_guide-d4445e6048-link">调试指南</a></div></div></li><li role="treeitem"><div data-tocid="cir_test_guide-d4445e6062" class="topicref" data-id="cir_test_guide" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/cir/cir_test.html" id="cir_test_guide-d4445e6062-link">测试指南</a></div></div></li><li role="treeitem" aria-expanded="true" class="active"><div data-tocid="cir_design_intro-d4445e6076" class="topicref" data-id="cir_design_intro" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action cir_design_intro-d4445e6076-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/cir/cir_design.html" id="cir_design_intro-d4445e6076-link">设计说明</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem"><div data-tocid="cir_key_procedures-d4445e6090" class="topicref" data-id="cir_key_procedures" 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href="../../../topics/sdk/rtp/rtp_user_guide.html" id="rtp-user-guide-d4445e6822-link">RTP 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="spi-d4445e6962" class="topicref" data-id="spi" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action spi-d4445e6962-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/spi/spi_user_guide.html" id="spi-d4445e6962-link">SPI 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d4445e7075" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d4445e7075-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/psadc/psadc_user_guide.html" id="id-d4445e7075-link">PSADC 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="uart_user_guide-d4445e7215" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d4445e7215-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide.html" id="uart_user_guide-d4445e7215-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_user_guide-d4445e7299" class="topicref" data-id="usb_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_user_guide-d4445e7299-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide.html" id="usb_user_guide-d4445e7299-link">USB 使用指南</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d4445e7944" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d4445e7944-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d4445e7944-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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">
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<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/cir/cir_design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;"></div>
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<div class="- topic/body concept/conbody body conbody">
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<section class="- topic/section section" id="cir_design_intro__section_cjj_4mn_4dc" data-ofbid="cir_design_intro__section_cjj_4mn_4dc"><h2 class="- topic/title title sectiontitle">源码说明</h2>
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<p class="- topic/p p" data-ofbid="d124267e38__20250123155211">CIR 模块的源码位于<span class="+ topic/ph sw-d/filepath ph filepath">linux-5.10/drivers/media/rc/artinchip-cir.c</span></p>
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</section>
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<section class="- topic/section section" id="cir_design_intro__section_t52_pmn_4dc" data-ofbid="cir_design_intro__section_t52_pmn_4dc"><h2 class="- topic/title title sectiontitle">模块架构</h2>
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<p class="- topic/p p" data-ofbid="d124267e49__20250123155211">linux 内核中 rc 的基本框架如下图所示：</p>
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<div class="- topic/p p" data-ofbid="d124267e52__20250123155211">
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<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="cir_design_intro__image_tgz_2fn_d1c" src="../../../images/cir/rc_arch_lb.png" width="480" alt="rc_arch1"/></div><br/>
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<p class="- topic/p p" data-ofbid="d124267e61__20250123155211">红外信号的编码和解码工作由<span class="- topic/ph ph">内核</span>负责完成。在完成编码后，应用层需要发送的信号被编码为一系列的带有宽度的高低电平（pulse/space），CIR driver
|
||
在发送端就是需要将这一系列的 pulse/space 写入发送 FIFO，发送出去。在接收红外信号时，CIR driver 需要将接收到的一系列高低电平送入到<span class="- topic/ph ph">rc core</span>进行解码，最终将解码得到的
|
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scancode<span class="- topic/ph ph">和 keycode 反馈</span>到输入子系统，最终送给 app 程序完成红外信号的接收。所以，CIR
|
||
驱动的主要任务有：</p>
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<ol class="- topic/ol ol" id="cir_design_intro__ol_ugz_2fn_d1c" data-ofbid="cir_design_intro__ol_ugz_2fn_d1c">
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<li class="- topic/li li" data-ofbid="d124267e75__20250123155211">
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<p class="- topic/p p" data-ofbid="d124267e77__20250123155211">将编码得到的高低电平信号以游码的形式写入 TX-FIFO，发送红外信号</p>
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</li>
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<li class="- topic/li li" data-ofbid="d124267e81__20250123155211">
|
||
<p class="- topic/p p" data-ofbid="d124267e83__20250123155211">将 CIR 模块接收的 RX-FIFO 中的游码正确表示为高低电平的形式，相邻的高电平或低电平需要进行合并。</p>
|
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</li>
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<li class="- topic/li li" data-ofbid="d124267e87__20250123155211">
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<p class="- topic/p p" data-ofbid="d124267e89__20250123155211">根据用户空间传递的红外参数，对 CIR 的底层寄存器进行配置，如配置载波频率，配置占空比等</p>
|
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</li>
|
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</ol>
|
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<p class="- topic/p p" data-ofbid="d124267e95__20250123155211">由于红外信号的数据量都很少，所以在红外信号的发送端，一般是利用循环将所有的数据一次性全部发送出去，而不会采用中断或 DMA
|
||
的方式。在红外信号的接收端，一般是采用中断的方式进行数据的接收，在接收完成后，调用相应的解码函数进行解码。CIR
|
||
模块可以支持任何的红外协议，对不同红外协议的支持可以通过对载波配置寄存器的设置来实现。CIR 驱动中默认配置的是支持 NEC 协议。</p>
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