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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/cir/cir_design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1><div class="date inPage">2 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="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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<div class="- topic/p p" data-ofbid="d112176e27__20250121171554">CIR 模块的源码位于<span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/</span><ul class="- topic/ul ul" id="cir_design_intro__ul_uth_b5k_g1c" data-ofbid="cir_design_intro__ul_uth_b5k_g1c"><li class="- topic/li li" data-ofbid="d112176e32__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e34__20250121171554">bsp/artinchip/drv/cir/drv_cir.c，cir driver 层接口实现</p>
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</li><li class="- topic/li li" data-ofbid="d112176e37__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e39__20250121171554">bsp/artinchip/include/drv/drv_cir.h，cir driver 层接口头文件</p>
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</li><li class="- topic/li li" data-ofbid="d112176e42__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e44__20250121171554">bsp/artinchip/drv/cir/nec_decoder.c，NEC 协议编解码实现</p>
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</li><li class="- topic/li li" data-ofbid="d112176e47__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e49__20250121171554">bsp/artinchip/drv/cir/rc5_decoder.c，RC5 协议编解码实现</p>
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</li><li class="- topic/li li" data-ofbid="d112176e52__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e54__20250121171554">bsp/artinchip/drv/cir/ir_raw.c，编解码调用及注册接口实现</p>
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</li><li class="- topic/li li" data-ofbid="d112176e57__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e59__20250121171554">bsp/artinchip/drv/cir/ir_raw.h，编解码调用及注册接口头文件</p>
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</li><li class="- topic/li li" data-ofbid="d112176e62__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e64__20250121171554">bsp/artinchip/hal/cir/hal_cir.c，cir hal 层接口实现</p>
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</li><li class="- topic/li li" data-ofbid="d112176e67__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e69__20250121171554">bsp/artinchip/include/hal/hal_cir.h，cir hal 层接口头文件及寄存器定义</p>
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</li></ul></div>
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</section><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="d112176e78__20250121171554">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="d112176e81__20250121171554">
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<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="cir_design_intro__image_d4h_d5k_g1c" src="../../../images/cir/rc_arch_lite.png" width="384" alt="rc_arch"/></div><br/>
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</div>
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<p class="- topic/p p" data-ofbid="d112176e88__20250121171554">红外信号的编码和解码工作由<span class="- topic/ph ph">CIR
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协议</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
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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">CIR 协议</span>进行解码，最终将解码得到的
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scancode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
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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"><li class="- topic/li li" data-ofbid="d112176e98__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e100__20250121171554">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><li class="- topic/li li" data-ofbid="d112176e103__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e105__20250121171554">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><li class="- topic/li li" data-ofbid="d112176e108__20250121171554">
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<p class="- topic/p p" data-ofbid="d112176e110__20250121171554">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></ol>
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<p class="- topic/p p" data-ofbid="d112176e115__20250121171554">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
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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
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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。<span class="- topic/ph ph">Luban-Lite
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中目前提供了 NEC 和 RC5 协议的编解码，</span>CIR 驱动中默认配置的是支持 NEC 协议。</p>
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</section></div></article></main></div>
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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="#cir_design_intro__section_cjj_4mn_4dc" data-tocid="cir_design_intro__section_cjj_4mn_4dc">源码说明</a></div></li><li class="section-item"><div class="section-title"><a href="#cir_design_intro__section_t52_pmn_4dc" data-tocid="cir_design_intro__section_t52_pmn_4dc">模块架构</a></div></li></ul></div>
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