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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_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">I2C 配置</h1>
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<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 class="- topic/body concept/conbody body conbody">
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<div class="- topic/p p" data-ofbid="d97022e33__20250123155207">I2C 包括以下配置内容：<ol class="- topic/ol ol" id="i2c_configuration__ol_q5h_rtr_21c" data-ofbid="i2c_configuration__ol_q5h_rtr_21c">
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<li class="- topic/li li" data-ofbid="d97022e37__20250123155207">内核配置<ol class="- topic/ol ol" type="a" id="i2c_configuration__ol_gs2_str_21c" data-ofbid="i2c_configuration__ol_gs2_str_21c">
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<li class="- topic/li li" data-ofbid="d97022e41__20250123155207">master 驱动使能<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_configuration__pre_hkk_ptr_21c" data-ofbid="i2c_configuration__pre_hkk_ptr_21c"><code>Device Drivers
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I2C support--->
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<*> I2C support
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<*> I2C device interface
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I2C Hardware Bus support--->
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<*> ArtInChip I2C support
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</code></pre></li>
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<li class="- topic/li li" data-ofbid="d97022e46__20250123155207">slave 驱动使能<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_configuration__pre_jkk_ptr_21c" data-ofbid="i2c_configuration__pre_jkk_ptr_21c"><code>Device Drivers
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I2C support--->
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<*> I2C support
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<*> I2C device interface
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I2C Hardware Bus support--->
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<*> ArtInChip I2C support
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<*> ArtInChip I2C as slave mode
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<*> I2C slave support
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<*> I2C eeprom slave driver
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</code></pre><div class="- topic/note note note note_note" id="i2c_configuration__note_umd_ttr_21c" data-ofbid="i2c_configuration__note_umd_ttr_21c"><span class="note__title">注：</span> <div class="note__body">
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<p class="- topic/p p" data-ofbid="d97022e52__20250123155207">在将 I2C 作为 slave 时，需要一个 backend 程序，作为 slave 的功能逻辑实现。此处选择内核自带的
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eeprom，即 I2C 作为 slave 时，是当做一个 eeprom
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的功能在使用。也可以根据实际情况自己实现相应的 backend 代码</p>
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</div></div></li>
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<li class="- topic/li li" data-ofbid="d97022e56__20250123155207">eeprom 驱动使能<p class="- topic/p p" data-ofbid="d97022e58__20250123155207">使用 I2C 接口与 eeprom 通信，是一种应用非常广泛的场景。此处介绍如何使能内核的 eeprom
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驱动(需要先使能 I2C 的 master
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驱动)。</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_configuration__pre_lkk_ptr_21c" data-ofbid="i2c_configuration__pre_lkk_ptr_21c"><code>Device Drivers
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Misc devices--->
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EEPROM support--->
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<*> I2C EEPROMs/RAMs/ROMs from most vendors
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</code></pre></li>
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</ol></li>
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<li class="- topic/li li" data-ofbid="d97022e64__20250123155207">DTS 配置<ol class="- topic/ol ol" type="a" id="i2c_configuration__ol_p54_5tr_21c" data-ofbid="i2c_configuration__ol_p54_5tr_21c">
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<li class="- topic/li li" data-ofbid="d97022e68__20250123155207">I2C 公共参数配置，以 I2C0
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为例<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_configuration__codeblock_dwc_vtr_21c" data-ofbid="i2c_configuration__codeblock_dwc_vtr_21c"><code>i2c0: i2c@<span class="hl-number">19220000</span> {
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compatible = <span class="hl-string">"artinchip,aic-i2c-v1.0"</span>;
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reg = <<span class="hl-number">0x0</span> <span class="hl-number">0x19220000</span> <span class="hl-number">0x0</span> <span class="hl-number">0x400</span>>;
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interrupts-extended = <&plic0 <span class="hl-number">84</span> IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&cmu CLK_I2C0>;
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resets = <&rst RESET_I2C0>;
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#address-cells = <<span class="hl-number">1</span>>;
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#size-cells = <<span class="hl-number">0</span>>;
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};</code></pre></li>
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<li class="- topic/li li" data-ofbid="d97022e73__20250123155207">I2C master 配置<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_configuration__codeblock_f32_wtr_21c" data-ofbid="i2c_configuration__codeblock_f32_wtr_21c"><code>&i2c0 {
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pinctrl-names = <span class="hl-string">"default"</span>;
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pinctrl-<span class="hl-number">0</span> = <&i2c0_pins_a>;
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status = <span class="hl-string">"okay"</span>;
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eeprom@<span class="hl-number">50</span> {
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compatible = <span class="hl-string">"atmel,24c64"</span>;
|
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reg = <<span class="hl-number">0x50</span>>;
|
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|
pagesize = <<span class="hl-number">32</span>>;
|
|||
|
|
};
|
|||
|
|
};</code></pre><div class="- topic/note note note note_note" id="i2c_configuration__note_lf4_wtr_21c" data-ofbid="i2c_configuration__note_lf4_wtr_21c"><span class="note__title">注：</span> <div class="note__body">
|
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|
|
<p class="- topic/p p" data-ofbid="d97022e79__20250123155207">该配置是将 eeprom 挂在 I2C0 总线上的配置，reg 属性表示 slave 设备的地址，pagesize 表示
|
|||
|
|
eeprom 一页有 32byte。若在 I2C 总线上挂其它设备，对 DTS
|
|||
|
|
进行相应修改即可。</p>
|
|||
|
|
</div></div></li>
|
|||
|
|
<li class="- topic/li li" data-ofbid="d97022e83__20250123155207">I2C slave
|
|||
|
|
配置<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_configuration__codeblock_p4h_xtr_21c" data-ofbid="i2c_configuration__codeblock_p4h_xtr_21c"><code>&i2c0 {
|
|||
|
|
pinctrl-names = <span class="hl-string">"default"</span>;
|
|||
|
|
pinctrl-<span class="hl-number">0</span> = <&i2c0_pins_a>;
|
|||
|
|
status = <span class="hl-string">"okay"</span>;
|
|||
|
|
slave@<span class="hl-number">54</span> {
|
|||
|
|
compatible = <span class="hl-string">"slave-24c02"</span>;
|
|||
|
|
reg = <<span class="hl-number">0x40000054</span>>;
|
|||
|
|
};
|
|||
|
|
};</code></pre><p class="- topic/p p" data-ofbid="d97022e87__20250123155207">内核的 I2C 子系统框架会通过查看 reg 属性的
|
|||
|
|
bit30，判断 I2C 是工作在主机模式还是从机模式。若 bit30 为
|
|||
|
|
1，则为从机模式。上述配置表示 I2C 工作在从机模式，设备地址为
|
|||
|
|
0x54。</p><div class="- topic/p p" data-ofbid="d97022e89__20250123155207">若需要设置从机为 10bit 寻址，则需要设置 reg 属性的 bit31
|
|||
|
|
为 1，如下图所示，配置从机地址为
|
|||
|
|
0x139。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_configuration__codeblock_qrv_xtr_21c" data-ofbid="i2c_configuration__codeblock_qrv_xtr_21c"><code>&i2c0 {
|
|||
|
|
pinctrl-names = <span class="hl-string">"default"</span>;
|
|||
|
|
pinctrl-<span class="hl-number">0</span> = <&i2c0_pins_a>;
|
|||
|
|
status = <span class="hl-string">"okay"</span>;
|
|||
|
|
slave@<span class="hl-number">139</span> {
|
|||
|
|
compatible = <span class="hl-string">"slave-24c02"</span>;
|
|||
|
|
reg = <<span class="hl-number">0xC0000139</span>>;
|
|||
|
|
};
|
|||
|
|
};</code></pre></div></li>
|
|||
|
|
</ol></li>
|
|||
|
|
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Update Time: 2025-01-23
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