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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/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><div class="date inPage">2 Dec 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"><ul class="- topic/ul ul" id="i2c_data_structure_design__ul_zzr_3hz_gdc" data-ofbid="i2c_data_structure_design__ul_zzr_3hz_gdc"><li class="- topic/li li" data-ofbid="d162638e24__20250121171617">
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<div class="- topic/p p" data-ofbid="d162638e26__20250121171617">drv 层管理 I2C
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控制器资源的顶层结构体<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_data_structure_design__codeblock_d5r_gg3_fdc" data-ofbid="i2c_data_structure_design__codeblock_d5r_gg3_fdc"><strong class="hl-keyword">struct</strong> aic_i2c_bus {
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<strong class="hl-keyword">struct</strong> rt_i2c_bus_device bus; <em class="hl-comment">//RTT 内核 I2C 控制器数据结构</em>
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aic_i2c_ctrl aic_bus; <em class="hl-comment">//I2C 控制器资源的底层结构体</em>
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<strong class="hl-keyword">struct</strong> rt_completion cmd_complete; <em class="hl-comment">//完成量，用于指示一个 message 是否传输完成</em>
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};</pre></div>
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</li><li class="- topic/li li" data-ofbid="d162638e31__20250121171617">
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<div class="- topic/p p" data-ofbid="d162638e33__20250121171617">RTT 内核 I2C
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控制器数据结构<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_data_structure_design__codeblock_bs5_gg3_fdc" data-ofbid="i2c_data_structure_design__codeblock_bs5_gg3_fdc"><strong class="hl-keyword">struct</strong> rt_i2c_bus_device
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{
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<strong class="hl-keyword">struct</strong> rt_device parent; <em class="hl-comment">//设备基类 device</em>
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<strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> rt_i2c_bus_device_ops *ops; <em class="hl-comment">//I2C 操作方法</em>
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rt_uint16_t flags; <em class="hl-comment">//I2C 读写标志</em>
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<strong class="hl-keyword">struct</strong> rt_mutex lock; <em class="hl-comment">//互斥锁，保证多线程访问安全</em>
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rt_uint32_t timeout; <em class="hl-comment">//超时时间</em>
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rt_uint32_t retries; <em class="hl-comment">//调用次数</em>
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<strong class="hl-keyword">void</strong> *priv; <em class="hl-comment">//私有数据</em>
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};</pre></div>
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</li><li class="- topic/li li" data-ofbid="d162638e38__20250121171617">
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<div class="- topic/p p" data-ofbid="d162638e40__20250121171617">hal 层管理 I2C
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控制器资源的底层结构体<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_data_structure_design__codeblock_scw_gg3_fdc" data-ofbid="i2c_data_structure_design__codeblock_scw_gg3_fdc"><strong class="hl-keyword">struct</strong> aic_i2c_ctrl
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{
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int32_t index;
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<strong class="hl-keyword">char</strong> *device_name;
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> reg_base;
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uint32_t addr_bit;
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uint32_t speed_mode;
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uint32_t bus_mode;
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<strong class="hl-keyword">struct</strong> aic_i2c_msg *msg; <em class="hl-comment">//指向当前传输的 message</em>
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<strong class="hl-keyword">struct</strong> aic_i2c_slave_info slave; <em class="hl-comment">//从机信息数据结构</em>
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<strong class="hl-keyword">enum</strong> aic_msg_status msg_status;
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uint32_t slave_addr;
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uint32_t abort_source;
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uint32_t msg_err;
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uint32_t buf_write_idx; <em class="hl-comment">//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)。</em>
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uint32_t buf_read_idx; <em class="hl-comment">//读数据的计数</em>
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bool is_first_message; <em class="hl-comment">//是否是最后一个 message</em>
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bool is_last_message; <em class="hl-comment">//是否是第一个 message</em>
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};</pre></div>
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</li><li class="- topic/li li" data-ofbid="d162638e45__20250121171617">
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<div class="- topic/p p" data-ofbid="d162638e47__20250121171617">I2C
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消息数据结构原型<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_data_structure_design__codeblock_avx_gg3_fdc" data-ofbid="i2c_data_structure_design__codeblock_avx_gg3_fdc"><strong class="hl-keyword">struct</strong> aic_i2c_msg
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{
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uint16_t addr; <em class="hl-comment">// 从机地址</em>
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uint16_t flags; <em class="hl-comment">// 读写标志</em>
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uint16_t len; <em class="hl-comment">// 数据长度</em>
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uint8_t *buf; <em class="hl-comment">// 待传输数据的指针</em>
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};</pre></div>
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</li><li class="- topic/li li" data-ofbid="d162638e52__20250121171617">
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<div class="- topic/p p" data-ofbid="d162638e54__20250121171617">I2C
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从机信息数据结构原型<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_data_structure_design__codeblock_m3z_gg3_fdc" data-ofbid="i2c_data_structure_design__codeblock_m3z_gg3_fdc"><strong class="hl-keyword">struct</strong> aic_i2c_slave_info
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{
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<strong class="hl-keyword">void</strong> *callback_param; <em class="hl-comment">//回调参数</em>
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i2c_slave_cb_t slave_cb; <em class="hl-comment">//从机回调函数</em>
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};</pre></div>
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