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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/i2s/i2s_key_procedure_lite.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;">
|
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Read time: 2 minute(s)
|
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="i2s-key-process-lite__section_sh3_hyl_4dc" data-ofbid="i2s-key-process-lite__section_sh3_hyl_4dc"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d340897e31__20250121171903">
|
||
<ol class="- topic/ol ol arabic simple" id="i2s-key-process-lite__ol_cvg_kkf_fdc" data-ofbid="i2s-key-process-lite__ol_cvg_kkf_fdc"><li class="- topic/li li" data-ofbid="d340897e34__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e36__20250121171903">释放 reset 和 clock 信号</p>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e39__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e41__20250121171903">注册 i2s 设备</p>
|
||
</li></ol>
|
||
</div>
|
||
</section><section class="- topic/section section" id="i2s-key-process-lite__section_ry3_gyl_4dc" data-ofbid="i2s-key-process-lite__section_ry3_gyl_4dc"><h2 class="- topic/title title sectiontitle">Playback 流程</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d340897e51__20250121171903">
|
||
<ul class="- topic/ul ul" id="i2s-key-process-lite__ul_bfp_2nf_fdc" data-ofbid="i2s-key-process-lite__ul_bfp_2nf_fdc"><li class="- topic/li li" data-ofbid="d340897e54__20250121171903">
|
||
<div class="- topic/div div section" id="i2s-key-process-lite__init">
|
||
<strong class="+ topic/ph hi-d/b ph b">init 流程</strong>
|
||
<ol class="- topic/ol ol arabic simple" id="i2s-key-process-lite__ol_dvg_kkf_fdc" data-ofbid="i2s-key-process-lite__ol_dvg_kkf_fdc"><li class="- topic/li li" data-ofbid="d340897e62__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e64__20250121171903">初始化 DMA 传输的起始地址，buf_len 以及 period_len</p>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e67__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e69__20250121171903">注册 hal 层的回调函数</p>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e72__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e74__20250121171903">初始化 codec</p>
|
||
</li></ol><p class="- topic/p p" data-ofbid="d340897e77__20250121171903">I2S 模块使用 DMA 传输音频数据，DMA 采用环形链表形式，依次将音频数据传送到硬件。所以需要配置 DMA
|
||
传输时的起始地址（即 TX buffer 地址）以及 buf_len，period_len。在 driver 层驱动，将 buf_len
|
||
配置为 period_len 的 4 倍，DMA 每传输 period_len 长度的数据，触发一次 DMA 中断，通知 CPU 向
|
||
TX buffer 中写入数据。</p></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e80__20250121171903">
|
||
<div class="- topic/div div section" id="i2s-key-process-lite__start">
|
||
<strong class="+ topic/ph hi-d/b ph b">start 流程</strong>
|
||
<ol class="- topic/ol ol arabic simple" id="i2s-key-process-lite__ol_evg_kkf_fdc" data-ofbid="i2s-key-process-lite__ol_evg_kkf_fdc"><li class="- topic/li li" data-ofbid="d340897e88__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e90__20250121171903">填充 TX buffer</p>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e93__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e95__20250121171903">设置 DMA 传输的参数，调用 <span class="+ topic/keyword pr-d/apiname keyword apiname">hal_i2s_playback_start</span>
|
||
开始音频数据传输</p>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e101__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e103__20250121171903">调用 codec_start 启用 codec 芯片</p>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e106__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e108__20250121171903">使能 PA</p>
|
||
</li></ol><p class="- topic/p p" data-ofbid="d340897e111__20250121171903">为保证 DMA 传输音频数据的连续性，需要在 DMA 开始传输前，先向 TX buffer 中填充数据。在 playback 的
|
||
driver 层驱动，是将 TX buffer 填充满后，才开始 DMA 的传输。</p></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e114__20250121171903">
|
||
<div class="- topic/div div section" id="i2s-key-process-lite__dma">
|
||
<strong class="+ topic/ph hi-d/b ph b">DMA 中断流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d340897e121__20250121171903">DMA 每传输完 period_len 长度的数据后，触发一次 DMA 中断，然后通过 DMA 回调函数的逐级调用，最终调用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">rt_audio_tx_complete</span> 对 TX buffer 进行填充，每次填充
|
||
period_len 长度的音频数据。</p></div>
|
||
</li></ul>
|
||
</div>
|
||
</section><section class="- topic/section section" id="i2s-key-process-lite__section_bhv_2yl_4dc" data-ofbid="i2s-key-process-lite__section_bhv_2yl_4dc"><h2 class="- topic/title title sectiontitle"><strong class="+ topic/ph hi-d/b ph b">Record 流程</strong></h2>
|
||
|
||
<ul class="- topic/ul ul" id="i2s-key-process-lite__ul_xt4_fnf_fdc" data-ofbid="i2s-key-process-lite__ul_xt4_fnf_fdc"><li class="- topic/li li" data-ofbid="d340897e136__20250121171903">
|
||
<div class="- topic/div div section" id="i2s-key-process-lite__id8">
|
||
<strong class="+ topic/ph hi-d/b ph b"><code class="+ topic/ph pr-d/codeph ph codeph">init</code> 流程</strong>
|
||
<ol class="- topic/ol ol arabic simple" id="i2s-key-process-lite__ol_fvg_kkf_fdc" data-ofbid="i2s-key-process-lite__ol_fvg_kkf_fdc"><li class="- topic/li li" data-ofbid="d340897e146__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e148__20250121171903">初始化 DMA 传输的起始地址、<span class="+ topic/keyword pr-d/parmname keyword parmname">buf_len</span> 以及
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">period_len</span>。</p>
|
||
<p class="- topic/p p" data-ofbid="d340897e157__20250121171903">I2S 模块使用 DMA 传输音频数据，DMA 采用环形链表形式，依次将音频数据传送到硬件。所以需要配置 DMA
|
||
传输时的起始地址（即 RX buffer 地址）以及
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">buf_len</span>，<span class="+ topic/keyword pr-d/parmname keyword parmname">period_len</span>。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e166__20250121171903">
|
||
<p class="- topic/p p" data-ofbid="d340897e168__20250121171903">注册 HAL 层的回调函数。</p>
|
||
<p class="- topic/p p" data-ofbid="d340897e171__20250121171903">在 Driver 层驱动，将 <span class="+ topic/keyword pr-d/parmname keyword parmname">buf_len</span> 配置为
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">period_len</span> 的 2 倍，DMA 每传输
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">period_len</span> 长度的数据，触发一次 DMA 中断，通知 CPU 向
|
||
pipe 设备写入数据。</p>
|
||
</li></ol></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e184__20250121171903">
|
||
<div class="- topic/div div section" id="i2s-key-process-lite__id9">
|
||
<strong class="+ topic/ph hi-d/b ph b"><code class="+ topic/ph pr-d/codeph ph codeph">start</code> 流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d340897e193__20250121171903">按照 RT-Thread audio 的框架，在执行 <span class="+ topic/keyword pr-d/apiname keyword apiname">rt_device_open</span> 时，就会调用
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">start</code> 流程，开始音频的录制，然后再通过
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">rt_device_control</span>
|
||
设置音频的格式（采样率，通道数等）。按照这个流程，最开始可能会录制一段不符合设置的音频格式的数据，这显然是不合理的。所以，在 Driver
|
||
层的驱动实现中，<code class="+ topic/ph pr-d/codeph ph codeph">start</code>
|
||
流程并未做任何处理，而是在设置完音频格式后才开始音频的录制。</p></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340897e208__20250121171903">
|
||
<div class="- topic/div div section" id="i2s-key-process-lite__id10">
|
||
<strong class="+ topic/ph hi-d/b ph b">DMA 中断流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d340897e215__20250121171903">DMA 每传输完 <span class="+ topic/keyword pr-d/parmname keyword parmname">period_len</span> 长度的数据后，触发一次 DMA 中断，然后通过 DMA
|
||
回调函数的逐级调用，最终调用 <span class="+ topic/keyword pr-d/apiname keyword apiname">rt_audio_rx_done</span>，将 RX buffer 的数据写入到
|
||
pipe 设备，每次写入 <span class="+ topic/keyword pr-d/parmname keyword parmname">period_len</span> 长度的音频数据。</p></div>
|
||
</li></ul>
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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="#i2s-key-process-lite__section_sh3_hyl_4dc" data-tocid="i2s-key-process-lite__section_sh3_hyl_4dc">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#i2s-key-process-lite__section_ry3_gyl_4dc" data-tocid="i2s-key-process-lite__section_ry3_gyl_4dc">Playback 流程</a></div></li><li class="section-item"><div class="section-title"><a href="#i2s-key-process-lite__section_bhv_2yl_4dc" data-tocid="i2s-key-process-lite__section_bhv_2yl_4dc"><strong class="+ topic/ph hi-d/b ph b">Record 流程</strong></a></div></li></ul></div>
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