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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/i2c/i2c_data_struct.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">数据结构设计</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div>
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<div class="- topic/body concept/conbody body conbody">
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<div class="- topic/p p" data-ofbid="d181220e33__20250123155219">管理 I2C 控制器资源的顶层结构体：<div class="- topic/div div">
|
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_data_structure_design__codeblock_fs4_dbl_g1c" data-ofbid="i2c_data_structure_design__codeblock_fs4_dbl_g1c"><code><strong class="hl-keyword">struct</strong> aic_i2c_dev {
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<strong class="hl-keyword">struct</strong> device *dev;
|
||
<strong class="hl-keyword">void</strong> __iomem *base;
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<strong class="hl-keyword">struct</strong> i2c_adapter adap;
|
||
<strong class="hl-keyword">struct</strong> completion cmd_complete;
|
||
<strong class="hl-keyword">struct</strong> clk *clk;
|
||
<strong class="hl-keyword">struct</strong> reset_control *rst;
|
||
<strong class="hl-keyword">int</strong> irq;
|
||
<strong class="hl-keyword">enum</strong> aic_i2c_speed i2c_speed;
|
||
u16 scl_hcnt;
|
||
u16 scl_lcnt;
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||
u32 abort_source;
|
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<strong class="hl-keyword">struct</strong> i2c_msg *msg;
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||
<strong class="hl-keyword">enum</strong> aic_msg_status msg_status;
|
||
<strong class="hl-keyword">int</strong> buf_write_idx;
|
||
<strong class="hl-keyword">int</strong> buf_read_idx;
|
||
bool is_first_message;
|
||
bool is_last_message;
|
||
<strong class="hl-keyword">int</strong> msg_err;
|
||
<strong class="hl-keyword">struct</strong> i2c_timings timings;
|
||
u32 master_cfg;
|
||
u32 slave_cfg;
|
||
<strong class="hl-keyword">struct</strong> i2c_client *slave;
|
||
};</code></pre>
|
||
<div class="- topic/p p" data-ofbid="d181220e40__20250123155219">部分变量说明：<ul class="- topic/ul ul" id="i2c_data_structure_design__ul_i4t_y5r_21c" data-ofbid="i2c_data_structure_design__ul_i4t_y5r_21c">
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<li class="- topic/li li" data-ofbid="d181220e44__20250123155219">
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<p class="- topic/p p" data-ofbid="d181220e46__20250123155219">cmd_complete：完成量，用于指示一个 message 是否传输完成</p>
|
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</li>
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<li class="- topic/li li" data-ofbid="d181220e50__20250123155219">
|
||
<p class="- topic/p p" data-ofbid="d181220e52__20250123155219">scl_hcnt：SCL 时钟高电平时钟数</p>
|
||
</li>
|
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<li class="- topic/li li" data-ofbid="d181220e56__20250123155219">
|
||
<p class="- topic/p p" data-ofbid="d181220e58__20250123155219">scl_lcnt：SCL 时钟低电平时钟数</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d181220e62__20250123155219">
|
||
<p class="- topic/p p" data-ofbid="d181220e64__20250123155219">msg：指向当前传输的 message</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d181220e68__20250123155219">
|
||
<p class="- topic/p p" data-ofbid="d181220e70__20250123155219">buf_write_idx：当前 message 为 write msg 时，buf_write_idx 为写数据的计数。当前
|
||
message 为 read msg 时，buf_write_idx 为写命令的计数(I2C 模块需要每次写 read
|
||
命令，才能读出数据)。</p>
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</li>
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<li class="- topic/li li" data-ofbid="d181220e75__20250123155219">
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<p class="- topic/p p" data-ofbid="d181220e77__20250123155219">buf_read_idx：读数据的计数</p>
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</li>
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<li class="- topic/li li" data-ofbid="d181220e81__20250123155219">
|
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<p class="- topic/p p" data-ofbid="d181220e83__20250123155219">is_first_message：是否是第一个 message</p>
|
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</li>
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<li class="- topic/li li" data-ofbid="d181220e87__20250123155219">
|
||
<p class="- topic/p p" data-ofbid="d181220e89__20250123155219">is_last_message：是否是最后一个 message</p>
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</li>
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