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<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.0">
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<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><meta name="description" content="I2C 包括以下配置内容： 内核配置 master 驱动使能 Device Drivers I2C support---> <*> I2C support <*> I2C device interface I2C Hardware Bus support---> <*> ArtInChip I2C support slave 驱动使能 Device Drivers I2C support---> ..."/><meta name="DC.rights.owner" content="(C) 版权 2025"/><meta name="copyright" content="(C) 版权 2025"/><meta name="generator" content="DITA-OT"/><meta name="DC.type" content="concept"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.date.modified" content="2024-07-08"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="i2c_configuration"/><meta name="DC.language" content="zh-CN"/><title>I2C 配置</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/i2c/i2c_config.dita"/><meta name="wh-out-relpath" content="topics/sdk/i2c/i2c_config.html"/>
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<a href="http://www.artinchip.com" class=" wh_logo d-none d-sm-block "><img src="../../../company-logo-white.png" alt="RTOS SDK 使用指南SDK 指南文件"/></a>
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<div class=" wh_publication_title "><a href="../../../index.html"><span class="booktitle"><span class="ph mainbooktitle">RTOS SDK 使用指南</span><span class="ph booktitlealt">SDK 指南文件</span></span></a></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"><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_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">I2C 配置</h1><div class="date inPage">8 Jul 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"><div class="- topic/p p" data-ofbid="d243385e22__20250121171700">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"><li class="- topic/li li" data-ofbid="d243385e25__20250121171700">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"><li class="- topic/li li" data-ofbid="d243385e28__20250121171700">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">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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</pre></li><li class="- topic/li li" data-ofbid="d243385e32__20250121171700">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">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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</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>
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<p class="- topic/p p" data-ofbid="d243385e38__20250121171700">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></li><li class="- topic/li li" data-ofbid="d243385e41__20250121171700">eeprom 驱动使能<p class="- topic/p p" data-ofbid="d243385e43__20250121171700">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">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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</pre></li></ol></li><li class="- topic/li li" data-ofbid="d243385e47__20250121171700">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"><li class="- topic/li li" data-ofbid="d243385e50__20250121171700">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">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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};</pre></li><li class="- topic/li li" data-ofbid="d243385e54__20250121171700">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">&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>>;
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};
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};</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>
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<p class="- topic/p p" data-ofbid="d243385e60__20250121171700">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
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eeprom 一页有 32byte。若在 I2C 总线上挂其它设备，对 DTS
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进行相应修改即可。</p>
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</div></li><li class="- topic/li li" data-ofbid="d243385e63__20250121171700">I2C slave
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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">&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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slave@<span class="hl-number">54</span> {
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compatible = <span class="hl-string">"slave-24c02"</span>;
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reg = <<span class="hl-number">0x40000054</span>>;
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};
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};</pre><p class="- topic/p p" data-ofbid="d243385e67__20250121171700">内核的 I2C 子系统框架会通过查看 reg 属性的
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bit30，判断 I2C 是工作在主机模式还是从机模式。若 bit30 为
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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
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0x54。</p><div class="- topic/p p" data-ofbid="d243385e69__20250121171700">若需要设置从机为 10bit 寻址，则需要设置 reg 属性的 bit31
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为 1，如下图所示，配置从机地址为
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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">&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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slave@<span class="hl-number">139</span> {
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compatible = <span class="hl-string">"slave-24c02"</span>;
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reg = <<span class="hl-number">0xC0000139</span>>;
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};
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};</pre></div></li></ol></li></ol></div></div></article></main></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"><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;">
|
||||
Read time: 2 minute(s)
|
||||
</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">
|
||||
<div class="- topic/p p" data-ofbid="d162638e26__20250121171617">drv 层管理 I2C
|
||||
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 {
|
||||
<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>
|
||||
aic_i2c_ctrl aic_bus; <em class="hl-comment">//I2C 控制器资源的底层结构体</em>
|
||||
<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>
|
||||
};</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d162638e31__20250121171617">
|
||||
<div class="- topic/p p" data-ofbid="d162638e33__20250121171617">RTT 内核 I2C
|
||||
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
|
||||
{
|
||||
<strong class="hl-keyword">struct</strong> rt_device parent; <em class="hl-comment">//设备基类 device</em>
|
||||
<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>
|
||||
rt_uint16_t flags; <em class="hl-comment">//I2C 读写标志</em>
|
||||
<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>
|
||||
rt_uint32_t timeout; <em class="hl-comment">//超时时间</em>
|
||||
rt_uint32_t retries; <em class="hl-comment">//调用次数</em>
|
||||
<strong class="hl-keyword">void</strong> *priv; <em class="hl-comment">//私有数据</em>
|
||||
};</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d162638e38__20250121171617">
|
||||
<div class="- topic/p p" data-ofbid="d162638e40__20250121171617">hal 层管理 I2C
|
||||
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
|
||||
{
|
||||
int32_t index;
|
||||
<strong class="hl-keyword">char</strong> *device_name;
|
||||
<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> reg_base;
|
||||
uint32_t addr_bit;
|
||||
uint32_t speed_mode;
|
||||
uint32_t bus_mode;
|
||||
<strong class="hl-keyword">struct</strong> aic_i2c_msg *msg; <em class="hl-comment">//指向当前传输的 message</em>
|
||||
<strong class="hl-keyword">struct</strong> aic_i2c_slave_info slave; <em class="hl-comment">//从机信息数据结构</em>
|
||||
<strong class="hl-keyword">enum</strong> aic_msg_status msg_status;
|
||||
uint32_t slave_addr;
|
||||
uint32_t abort_source;
|
||||
uint32_t msg_err;
|
||||
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>
|
||||
uint32_t buf_read_idx; <em class="hl-comment">//读数据的计数</em>
|
||||
bool is_first_message; <em class="hl-comment">//是否是最后一个 message</em>
|
||||
bool is_last_message; <em class="hl-comment">//是否是第一个 message</em>
|
||||
};</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d162638e45__20250121171617">
|
||||
<div class="- topic/p p" data-ofbid="d162638e47__20250121171617">I2C
|
||||
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
|
||||
{
|
||||
uint16_t addr; <em class="hl-comment">// 从机地址</em>
|
||||
uint16_t flags; <em class="hl-comment">// 读写标志</em>
|
||||
uint16_t len; <em class="hl-comment">// 数据长度</em>
|
||||
uint8_t *buf; <em class="hl-comment">// 待传输数据的指针</em>
|
||||
};</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d162638e52__20250121171617">
|
||||
<div class="- topic/p p" data-ofbid="d162638e54__20250121171617">I2C
|
||||
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
|
||||
{
|
||||
<strong class="hl-keyword">void</strong> *callback_param; <em class="hl-comment">//回调参数</em>
|
||||
i2c_slave_cb_t slave_cb; <em class="hl-comment">//从机回调函数</em>
|
||||
};</pre></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"><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_debug.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</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="i2c_debug_guide__section_jvt_15r_21c" data-ofbid="i2c_debug_guide__section_jvt_15r_21c"><h2 class="- topic/title title sectiontitle">I2C 通信调试</h2>
|
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|
||||
<p class="- topic/p p" data-ofbid="d179052e27__20250121171624">在使能 C 的驱动后，可以通过 tools 中的 i2cdetect 工具，快速检测 C 通信功能是否正常。使能驱动后，会创建出相应的 C 适配器，但是 C
|
||||
通信功能是否正常仍是不确定的，可通过如下命令进行测试：</p>
|
||||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_debug_guide__codeblock_kvt_15r_21c" data-ofbid="i2c_debug_guide__codeblock_kvt_15r_21c">i2cdetect -y -r <span class="hl-number">0</span></pre>
|
||||
<p class="- topic/p p" data-ofbid="d179052e33__20250121171624">此命令用来测试 C 总线 0 上的地址分布情况。如果通信正常，即使总线上没有挂接任何 C 设备，那么也会立即返回结果。如果在该测试中返回 timeout，那么需要先检查
|
||||
C 的 SDA 和 SCL 是否有上拉(该问题一般是由于没有上拉导致)。如果有上拉，那么需要进一步进行调试。</p>
|
||||
</section><section class="- topic/section section" id="i2c_debug_guide__section_lvt_15r_21c" data-ofbid="i2c_debug_guide__section_lvt_15r_21c"><h2 class="- topic/title title sectiontitle">调试开关</h2>
|
||||
|
||||
<div class="- topic/p p" data-ofbid="d179052e41__20250121171624">I2C 的驱动由一些 dbg 的调试信息，默认情况下是不会打印的，当需要进行跟踪调试时，可通过以下步骤打开这些调试信息。<ol class="- topic/ol ol" id="i2c_debug_guide__ol_hdx_b5r_21c" data-ofbid="i2c_debug_guide__ol_hdx_b5r_21c"><li class="- topic/li li" data-ofbid="d179052e44__20250121171624">调整 log 等级<p class="- topic/p p" data-ofbid="d179052e46__20250121171624">通过 menuconfig 调整内核的 log
|
||||
等级</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_debug_guide__codeblock_nvt_15r_21c" data-ofbid="i2c_debug_guide__codeblock_nvt_15r_21c">Kernel hacking--->
|
||||
printk and dmesg options--->
|
||||
(<span class="hl-number">8</span>) Default console loglevel (<span class="hl-number">1</span>-<span class="hl-number">15</span>)
|
||||
</pre></li><li class="- topic/li li" data-ofbid="d179052e50__20250121171624">打开调试开关<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_debug_guide__codeblock_ovt_15r_21c" data-ofbid="i2c_debug_guide__codeblock_ovt_15r_21c">Kernel hacking--->
|
||||
ArtInChip Debug--->
|
||||
[*] I2C driver debug
|
||||
</pre></li></ol></div>
|
||||
</section></div></article></main></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"><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_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;">
|
||||
Read time: 2 minute(s)
|
||||
</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d126682e22__20250121171601">源代码位于：<span class="+ topic/ph sw-d/filepath ph filepath">linux-5.10/drivers/i2c/busses/</span></p><p class="- topic/p p" data-ofbid="d126682e26__20250121171601"> I2C 的驱动文件如下：</p><div class="table-container"><table class="- topic/table table frame-all" id="i2c_design_intro__table_lnt_y5r_21c" data-ofbid="i2c_design_intro__table_lnt_y5r_21c" data-cols="2"><caption></caption><colgroup><col style="width:39.0625%"/><col style="width:60.9375%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="i2c_design_intro__table_lnt_y5r_21c__entry__1">文件</th><th class="- topic/entry entry colsep-0 rowsep-1" id="i2c_design_intro__table_lnt_y5r_21c__entry__2">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__1"><span class="+ topic/ph sw-d/filepath ph filepath">i2c-artinchip.h</span></td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__2">aic I2C 公用头文件，I2C 模块的寄存器定义，结构体定义等</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__1"><span class="+ topic/ph sw-d/filepath ph filepath">i2c-artinchip-master.c</span></td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__2">I2C 作为 master 时的驱动文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__1"><span class="+ topic/ph sw-d/filepath ph filepath">i2c-artinchip-slave.c</span></td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__2">I2C 作为 slave 时的驱动文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="i2c_design_intro__table_lnt_y5r_21c__entry__1"><span class="+ topic/ph sw-d/filepath ph filepath">i2c-artinchip-common.c</span></td><td class="- topic/entry entry colsep-0 rowsep-0" headers="i2c_design_intro__table_lnt_y5r_21c__entry__2">I2C 一些公用寄存器读写函数的实现，以及 driver 的定义</td></tr></tbody></table></div><section class="- topic/section section" id="i2c_design_intro__section_mnt_y5r_21c" data-ofbid="i2c_design_intro__section_mnt_y5r_21c"><h2 class="- topic/title title sectiontitle">模块架构</h2>
|
||||
|
||||
<p class="- topic/p p" data-ofbid="d126682e68__20250121171601">linux 中 C 子系统的体系结构如下图所示</p>
|
||||
<div class="- topic/p p" data-ofbid="d126682e71__20250121171601">
|
||||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_design_intro__image_nnt_y5r_21c" src="../../../images/i2c/subsystem_arch.png" alt="subsystem_arch"/></div><br/>
|
||||
</div>
|
||||
<div class="- topic/p p" data-ofbid="d126682e78__20250121171601">在 C 子系统中，SOC 厂商需要实现的就是 adapter 部分的驱动，I2C adapter 是对 controller 的软件抽象。具体到上图，就是实现
|
||||
adapter 的 algorithm 以及特定 SOC 的 I2C 代码部分。I2C 模块支持 master 和 slave 两种模式，所以 adapter
|
||||
的驱动实现也就分为两部分：I2C master 驱动和 slave 驱动。<ul class="- topic/ul ul" id="i2c_design_intro__ul_dwk_2vr_21c" data-ofbid="i2c_design_intro__ul_dwk_2vr_21c"><li class="- topic/li li" data-ofbid="d126682e81__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e83__20250121171601">I2C master</p>
|
||||
<p class="- topic/p p" data-ofbid="d126682e86__20250121171601">I2C 作为 master 时，驱动的实现主要包括 4 个部分：</p>
|
||||
<ol class="- topic/ol ol" id="i2c_design_intro__ol_pnt_y5r_21c" data-ofbid="i2c_design_intro__ol_pnt_y5r_21c"><li class="- topic/li li" data-ofbid="d126682e90__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e92__20250121171601">硬件参数配置：主要是设置 C 工作的主机模式，7bit 或 10bit 寻址，寻址的从机地址设置，FIFO
|
||||
设置以及总线传输速率等。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d126682e95__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e97__20250121171601">SCL 时序参数设置：根据设置的总线传输速率，设置 SCL 的高低电平时间。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d126682e100__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e102__20250121171601">i2c_algorithm 的实现：作为主机端，主要是 xfer 的实现。在驱动实现中，以 message
|
||||
为单位进行数据的收发，数据的传输采用中断的方式。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d126682e105__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e107__20250121171601">中断的处理：处理 master 端的数据收发，并产生相应的 start、ack、nack、restart、stop 信号。</p>
|
||||
</li></ol>
|
||||
</li><li class="- topic/li li" data-ofbid="d126682e111__20250121171601">I2C slave<p class="- topic/p p" data-ofbid="d126682e113__20250121171601">I2C 作为从机时，需要一个相应的后端软件(对 C 从设备的软件模拟)，该后端软件与 adapter 驱动，组合成具有相应功能的
|
||||
C 从设备。内核的 C 子系统框架中提供了一个 EEPROM 的软件后端，与 slave 驱动一起，可以作为一个具有 C 接口的 EEPROM
|
||||
使用。</p><div class="- topic/p p" data-ofbid="d126682e115__20250121171601">
|
||||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_design_intro__image_grg_kvr_21c" src="../../../images/i2c/twi_slave.png" width="384" alt="twi_slave"/></div><br/>
|
||||
</div><p class="- topic/p p" data-ofbid="d126682e121__20250121171601">I2C 作为 slave 时，驱动的实现主要包括 3 个部分：</p><ol class="- topic/ol ol" id="i2c_design_intro__ol_hrg_kvr_21c" data-ofbid="i2c_design_intro__ol_hrg_kvr_21c"><li class="- topic/li li" data-ofbid="d126682e124__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e126__20250121171601">硬件参数配置：设置 C 工作的从模式，FIFO 设置等。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d126682e129__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e131__20250121171601">i2c_algorithm 的实现：作为从机端，主要是 slave 和 unreg_slave 的实现。reg_slave
|
||||
用于将一个 client 注册到从模式的 i2c adapter 上，unreg_slave 的功能与 slave
|
||||
相反。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d126682e134__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e136__20250121171601">中断的处理：处理 C 从机接收到的各种中断信号，并调用相应的回调函数进行数据的读写。</p>
|
||||
</li></ol></li></ul></div>
|
||||
<p class="- topic/p p" data-ofbid="d126682e140__20250121171601">综上，I2C 模块的驱动实现，主要的工作有：</p>
|
||||
<ul class="- topic/ul ul" id="i2c_design_intro__ul_d4q_kvr_21c" data-ofbid="i2c_design_intro__ul_d4q_kvr_21c"><li class="- topic/li li" data-ofbid="d126682e145__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e147__20250121171601">提供 C 控制器的 platform 驱动，初始化 C 适配器，判断 C 模块工作的主从模式，执行不同的初始化流程。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d126682e150__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e152__20250121171601">I2C 模块作为主机时，提供 C 适配器的 algorithm，并用具体适配器的 xfer 函数填充 i2c_algorithm 的 xfer 指针，并把
|
||||
algorithm 指针赋值给 i2c_adapter 的 algo 指针。处理 master 端时序的设置以及 I2C
|
||||
作为主机时的各种中断信号处理。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d126682e155__20250121171601">
|
||||
<p class="- topic/p p" data-ofbid="d126682e157__20250121171601">I2C 模块作为从机时，提供 C 适配器的 algorithm，实现具体适配器的 slave 和 unreg_slave 函数，并把 algorithm
|
||||
指针赋值给 i2c_adapter 的 algo 指针。处理 C 作为从机时的各种中断信号处理。</p>
|
||||
</li></ul>
|
||||
</section></div></article></main></div>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</div>
|
||||
|
||||
</div>
|
||||
</div>
|
||||
|
||||
|
||||
|
||||
</div>
|
||||
<footer class="navbar navbar-default wh_footer">
|
||||
<div class=" footer-container mx-auto ">
|
||||
<title>footer def</title>
|
||||
<style><!--
|
||||
|
||||
.p1 {
|
||||
font-family: FangZhengShuSong, Times, serif;
|
||||
}
|
||||
.p2 {
|
||||
font-family: Arial, Helvetica, sans-serif;
|
||||
}
|
||||
.p3 {
|
||||
font-family: "Lucida Console", "Courier New", monospace;
|
||||
}
|
||||
|
||||
--></style>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
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|
||||
|
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|
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|
||||
|
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<div class="webhelp.fragment.footer">
|
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<p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
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</div><div>
|
||||
<div class="generation_time">
|
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Update Time: 2025-01-21
|
||||
</div>
|
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</div>
|
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</div>
|
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</footer>
|
||||
|
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<div id="go2top" class="d-print-none">
|
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<span class="oxy-icon oxy-icon-up"></span>
|
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</div>
|
||||
|
||||
<div id="modal_img_large" class="modal">
|
||||
<span class="close oxy-icon oxy-icon-remove"></span>
|
||||
<div id="modal_img_container"></div>
|
||||
<div id="caption"></div>
|
||||
</div>
|
||||
|
||||
|
||||
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
||||
222
doc/topics/sdk/i2c/i2c_design_lite.html
Normal file
222
doc/topics/sdk/i2c/i2c_design_lite.html
Normal file
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161
doc/topics/sdk/i2c/i2c_faq.html
Normal file
161
doc/topics/sdk/i2c/i2c_faq.html
Normal file
@@ -0,0 +1,161 @@
|
||||
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.0">
|
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<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><meta name="description" content=""/><meta name="DC.rights.owner" content="(C) 版权 2025"/><meta name="copyright" content="(C) 版权 2025"/><meta name="generator" content="DITA-OT"/><meta name="DC.type" content="topic"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.date.modified" content="2024-10-30"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="id"/><meta name="DC.language" content="zh-CN"/><title>常见问题</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/i2c/i2c_faq.dita"/><meta name="wh-out-relpath" content="topics/sdk/i2c/i2c_faq.html"/>
|
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|
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<link rel="stylesheet" type="text/css" href="../../../webhelp/app/commons.css?buildId=2023110923"/>
|
||||
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/topic.css?buildId=2023110923"/>
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<script src="../../../webhelp/app/options/properties.js?buildId=20250121171154"></script>
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<script src="../../../webhelp/app/localization/strings.js?buildId=2023110923"></script>
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<script src="../../../webhelp/app/search/index/keywords.js?buildId=20250121171154"></script>
|
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<script defer="defer" src="../../../webhelp/app/commons.js?buildId=2023110923"></script>
|
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<script defer="defer" src="../../../webhelp/app/topic.js?buildId=2023110923"></script>
|
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<link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-styles-web.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/notes.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-common.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-images.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/footnote.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-web-watermark.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/topic-body-list.css?buildId=2023110923"/></head>
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|
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<body id="id" class="wh_topic_page frmBody">
|
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<a href="#wh_topic_body" class="sr-only sr-only-focusable">
|
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跳转到主要内容
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</a>
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<header class="navbar navbar-default wh_header">
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<div class="container-fluid">
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<div class="wh_header_flex_container navbar-nav navbar-expand-md navbar-dark">
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<div class="wh_logo_and_publication_title_container">
|
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<div class="wh_logo_and_publication_title">
|
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|
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<a href="http://www.artinchip.com" class=" wh_logo d-none d-sm-block "><img src="../../../company-logo-white.png" alt="RTOS SDK 使用指南SDK 指南文件"/></a>
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<div class=" wh_publication_title "><a href="../../../index.html"><span class="booktitle"><span class="ph mainbooktitle">RTOS SDK 使用指南</span><span class="ph booktitlealt">SDK 指南文件</span></span></a></div>
|
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|
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</div>
|
||||
|
||||
|
||||
</div>
|
||||
|
||||
<div class="wh_top_menu_and_indexterms_link collapse navbar-collapse" id="wh_top_menu_and_indexterms_link">
|
||||
|
||||
|
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|
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|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</header>
|
||||
|
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|
||||
|
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|
||||
<div class=" wh_search_input navbar-form wh_topic_page_search search " role="form">
|
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|
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<form id="searchForm" method="get" role="search" action="../../../search.html"><div><input type="search" placeholder="搜索 " class="wh_search_textfield" id="textToSearch" name="searchQuery" aria-label="搜索查询" required="required"/><button type="submit" class="wh_search_button" aria-label="搜索"><span class="search_input_text">搜索</span></button></div></form>
|
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|
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|
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|
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</div>
|
||||
|
||||
<div class="container-fluid" id="wh_topic_container">
|
||||
<div class="row">
|
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|
||||
<nav class="wh_tools d-print-none navbar-expand-md" aria-label="Tools">
|
||||
|
||||
<div data-tooltip-position="bottom" class=" wh_breadcrumb "></div>
|
||||
|
||||
|
||||
|
||||
<div class="wh_right_tools">
|
||||
<button class="wh_hide_highlight" aria-label="切换搜索突出显示" title="切换搜索突出显示"></button>
|
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<button class="webhelp_expand_collapse_sections" data-next-state="collapsed" aria-label="折叠截面" title="折叠截面"></button>
|
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|
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|
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|
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|
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<div class=" wh_print_link print d-none d-md-inline-block "><button onClick="window.print()" title="打印此页" aria-label="打印此页"></button></div>
|
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|
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|
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</div>
|
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|
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</nav>
|
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</div>
|
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|
||||
|
||||
|
||||
|
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<div class="wh_content_area">
|
||||
<div class="row">
|
||||
|
||||
|
||||
<div class="col-12" id="wh_topic_body">
|
||||
|
||||
|
||||
|
||||
<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" 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_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">30 Oct 2024</div><div style="color: gray;"></div><div class="- topic/body body"></div></article></main></div>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</div>
|
||||
|
||||
</div>
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</div>
|
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|
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|
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|
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</div>
|
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<footer class="navbar navbar-default wh_footer">
|
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<div class=" footer-container mx-auto ">
|
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<title>footer def</title>
|
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<style><!--
|
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|
||||
.p1 {
|
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font-family: FangZhengShuSong, Times, serif;
|
||||
}
|
||||
.p2 {
|
||||
font-family: Arial, Helvetica, sans-serif;
|
||||
}
|
||||
.p3 {
|
||||
font-family: "Lucida Console", "Courier New", monospace;
|
||||
}
|
||||
|
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--></style>
|
||||
|
||||
|
||||
|
||||
|
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|
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|
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|
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|
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|
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<div class="webhelp.fragment.footer">
|
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<p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
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</div><div>
|
||||
<div class="generation_time">
|
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Update Time: 2025-01-21
|
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</div>
|
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</div>
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</div>
|
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</footer>
|
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<div id="go2top" class="d-print-none">
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<span class="oxy-icon oxy-icon-up"></span>
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</div>
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<div id="modal_img_large" class="modal">
|
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<span class="close oxy-icon oxy-icon-remove"></span>
|
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<div id="modal_img_container"></div>
|
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<div id="caption"></div>
|
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</div>
|
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|
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|
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<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
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|
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|
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</body>
|
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</html>
|
||||
161
doc/topics/sdk/i2c/i2c_faq_2.html
Normal file
161
doc/topics/sdk/i2c/i2c_faq_2.html
Normal file
@@ -0,0 +1,161 @@
|
||||
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.0">
|
||||
<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><meta name="description" content=""/><meta name="DC.rights.owner" content="(C) 版权 2025"/><meta name="copyright" content="(C) 版权 2025"/><meta name="generator" content="DITA-OT"/><meta name="DC.type" content="topic"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.date.modified" content="2024-10-30"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="id"/><meta name="DC.language" content="zh-CN"/><title>常见问题</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/i2c/i2c_faq.dita"/><meta name="wh-out-relpath" content="topics/sdk/i2c/i2c_faq_2.html"/>
|
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|
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<link rel="stylesheet" type="text/css" href="../../../webhelp/app/commons.css?buildId=2023110923"/>
|
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<link rel="stylesheet" type="text/css" href="../../../webhelp/app/topic.css?buildId=2023110923"/>
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<script src="../../../webhelp/app/options/properties.js?buildId=20250121171154"></script>
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<script src="../../../webhelp/app/localization/strings.js?buildId=2023110923"></script>
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<script src="../../../webhelp/app/search/index/keywords.js?buildId=20250121171154"></script>
|
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<script defer="defer" src="../../../webhelp/app/commons.js?buildId=2023110923"></script>
|
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<script defer="defer" src="../../../webhelp/app/topic.js?buildId=2023110923"></script>
|
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<link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-styles-web.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/notes.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-common.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-images.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/footnote.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-web-watermark.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/topic-body-list.css?buildId=2023110923"/></head>
|
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|
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<body id="id" class="wh_topic_page frmBody">
|
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<a href="#wh_topic_body" class="sr-only sr-only-focusable">
|
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跳转到主要内容
|
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</a>
|
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|
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|
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|
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|
||||
<header class="navbar navbar-default wh_header">
|
||||
<div class="container-fluid">
|
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<div class="wh_header_flex_container navbar-nav navbar-expand-md navbar-dark">
|
||||
<div class="wh_logo_and_publication_title_container">
|
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<div class="wh_logo_and_publication_title">
|
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|
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<a href="http://www.artinchip.com" class=" wh_logo d-none d-sm-block "><img src="../../../company-logo-white.png" alt="RTOS SDK 使用指南SDK 指南文件"/></a>
|
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<div class=" wh_publication_title "><a href="../../../index.html"><span class="booktitle"><span class="ph mainbooktitle">RTOS SDK 使用指南</span><span class="ph booktitlealt">SDK 指南文件</span></span></a></div>
|
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|
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</div>
|
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|
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|
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</div>
|
||||
|
||||
<div class="wh_top_menu_and_indexterms_link collapse navbar-collapse" id="wh_top_menu_and_indexterms_link">
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|
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</div>
|
||||
</div>
|
||||
</div>
|
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</header>
|
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|
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|
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|
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|
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<div class=" wh_search_input navbar-form wh_topic_page_search search " role="form">
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<form id="searchForm" method="get" role="search" action="../../../search.html"><div><input type="search" placeholder="搜索 " class="wh_search_textfield" id="textToSearch" name="searchQuery" aria-label="搜索查询" required="required"/><button type="submit" class="wh_search_button" aria-label="搜索"><span class="search_input_text">搜索</span></button></div></form>
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|
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|
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|
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</div>
|
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|
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<div class="container-fluid" id="wh_topic_container">
|
||||
<div class="row">
|
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|
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<nav class="wh_tools d-print-none navbar-expand-md" aria-label="Tools">
|
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|
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<div data-tooltip-position="bottom" class=" wh_breadcrumb "></div>
|
||||
|
||||
|
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|
||||
<div class="wh_right_tools">
|
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<button class="wh_hide_highlight" aria-label="切换搜索突出显示" title="切换搜索突出显示"></button>
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<button class="webhelp_expand_collapse_sections" data-next-state="collapsed" aria-label="折叠截面" title="折叠截面"></button>
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|
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<div class=" wh_print_link print d-none d-md-inline-block "><button onClick="window.print()" title="打印此页" aria-label="打印此页"></button></div>
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</nav>
|
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</div>
|
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|
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|
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|
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|
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<div class="wh_content_area">
|
||||
<div class="row">
|
||||
|
||||
|
||||
<div class="col-12" id="wh_topic_body">
|
||||
|
||||
|
||||
|
||||
<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" 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_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">30 Oct 2024</div><div style="color: gray;"></div><div class="- topic/body body"></div></article></main></div>
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
</div>
|
||||
|
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</div>
|
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</div>
|
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|
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|
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|
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</div>
|
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<footer class="navbar navbar-default wh_footer">
|
||||
<div class=" footer-container mx-auto ">
|
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<title>footer def</title>
|
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<style><!--
|
||||
|
||||
.p1 {
|
||||
font-family: FangZhengShuSong, Times, serif;
|
||||
}
|
||||
.p2 {
|
||||
font-family: Arial, Helvetica, sans-serif;
|
||||
}
|
||||
.p3 {
|
||||
font-family: "Lucida Console", "Courier New", monospace;
|
||||
}
|
||||
|
||||
--></style>
|
||||
|
||||
|
||||
|
||||
|
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|
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|
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|
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|
||||
|
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|
||||
|
||||
<div class="webhelp.fragment.footer">
|
||||
<p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
|
||||
</div><div>
|
||||
<div class="generation_time">
|
||||
Update Time: 2025-01-21
|
||||
</div>
|
||||
</div>
|
||||
</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"><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_key_procedure.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">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="i2c_key_procedures__section_unt_y5r_21c" data-ofbid="i2c_key_procedures__section_unt_y5r_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2><p class="- topic/p p" data-ofbid="d259694e26__20250121171720">I2C 模块驱动的初始化流程如下：</p><p class="- topic/p p" data-ofbid="d259694e28__20250121171720"></p><div class="- topic/p p" data-ofbid="d259694e29__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_rfy_y1l_g1c" src="../../../images/i2c/i2c_design_init_rtos.png" width="144" alt="i2c_design_init_rtos"/></div><br/></div></section><section class="- topic/section section" id="i2c_key_procedures__section_ul2_xvr_21c" data-ofbid="i2c_key_procedures__section_ul2_xvr_21c"><h2 class="- topic/title title sectiontitle">传输流程</h2><p class="- topic/p p" data-ofbid="d259694e36__20250121171720">在 master 驱动中，数据的传输由 xfer 发起，可以完成多个 msg 的传输。传输流程如下：</p><div class="- topic/p p" data-ofbid="d259694e38__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_xnt_y5r_21c" src="../../../images/i2c/i2c_design_xfer.png" width="192" alt="i2c_design_xfer"/></div><br/></div></section><section class="- topic/section section" id="i2c_key_procedures__section_ynt_y5r_21c" data-ofbid="i2c_key_procedures__section_ynt_y5r_21c"><h2 class="- topic/title title sectiontitle">I2C 模块总线信号</h2>
|
||||
|
||||
<div class="- topic/p p" data-ofbid="d259694e47__20250121171720">在 I2C 总线的数据传输过程，由 start/restart/stop 作为总线的控制信号。了解 I2C 模块中 start/restart/stop
|
||||
信号的生成方式，有助于了解驱动的源码实现。<ul class="- topic/ul ul" id="i2c_key_procedures__ul_ab5_4vr_21c" data-ofbid="i2c_key_procedures__ul_ab5_4vr_21c"><li class="- topic/li li" data-ofbid="d259694e50__20250121171720">master transmitter<div class="- topic/p p" data-ofbid="d259694e52__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_a4t_y5r_21c" src="../../../images/i2c/i2c_master_transmitter.png" alt="master transmitter"/></div><br/></div><p class="- topic/p p" data-ofbid="d259694e56__20250121171720">对图中 3 个关键点的解释：</p><ol class="- topic/ol ol" id="i2c_key_procedures__ol_b4t_y5r_21c" data-ofbid="i2c_key_procedures__ol_b4t_y5r_21c"><li class="- topic/li li" data-ofbid="d259694e59__20250121171720">
|
||||
<p class="- topic/p p" data-ofbid="d259694e61__20250121171720">I2C 作为 transmitter 时，当向 TXFIFO 中写入数据时，I2C 模块会自动发出 start 信号</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d259694e64__20250121171720">
|
||||
<p class="- topic/p p" data-ofbid="d259694e66__20250121171720">若 stop 位未置位，则当 TXFIFO 中的数据全部发送，TXFIFO 为空时，会保持 SCL 为低电平，直到再次向
|
||||
TXFIFO 中写入数据</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d259694e69__20250121171720">
|
||||
<p class="- topic/p p" data-ofbid="d259694e71__20250121171720">再次向 TXFIFO 写入数据时，将 stop 位置 1，则在完成该字节的发送后，master 会自动发送 stop 信号</p>
|
||||
</li></ol></li><li class="- topic/li li" data-ofbid="d259694e74__20250121171720">master receiver<div class="- topic/p p" data-ofbid="d259694e76__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_d4t_y5r_21c" src="../../../images/i2c/i2c_master_receiver.png" alt="master receiver"/></div><br/></div><p class="- topic/p p" data-ofbid="d259694e80__20250121171720">对图中 3 个关键点的解释：</p><ol class="- topic/ol ol" id="i2c_key_procedures__ol_e4t_y5r_21c" data-ofbid="i2c_key_procedures__ol_e4t_y5r_21c"><li class="- topic/li li" data-ofbid="d259694e83__20250121171720">
|
||||
<p class="- topic/p p" data-ofbid="d259694e85__20250121171720">I2C 作为 receiver 时，当向 TXFIFO 写入读命令(即向 I2C_DATA_CMD 写入读命令) 时，I2C
|
||||
模块会自动发送 start 信号</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d259694e88__20250121171720">
|
||||
<p class="- topic/p p" data-ofbid="d259694e90__20250121171720">当接收到 slave 端发送的数据后，只有再次发送一次读命令，才会对本次收到的数据恢复 ACK 确认信号</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d259694e93__20250121171720">
|
||||
<p class="- topic/p p" data-ofbid="d259694e95__20250121171720">master 在接收到最后一个数据后，回复 NACK，slave 端才会结束数据的传送。在发送最后一个读命令时，同时将 stop
|
||||
位置位，则 master 在接收到 slave 发送的数据后，I2C 模块会自动发送 NACK 信号</p>
|
||||
</li></ol></li></ul></div>
|
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<div class="- topic/note note note note_note" id="i2c_key_procedures__note_vyr_qvr_21c" data-ofbid="i2c_key_procedures__note_vyr_qvr_21c"><span class="note__title">注：</span>
|
||||
<p class="- topic/p p" data-ofbid="d259694e101__20250121171720">I2C 模块的数据传输，无论是 transmitter 还是 receiver，都会用到 TXFIFO，transmitter 时用来发送数据，receiver
|
||||
时用来发送命令。所以，中断处理中，触发 TXFIFO_EMPTY 中断的，可能是 msg，也可能是 write msg</p>
|
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</div>
|
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</section><section class="- topic/section section" id="i2c_key_procedures__section_c4t_y5r_21c" data-ofbid="i2c_key_procedures__section_c4t_y5r_21c"><h2 class="- topic/title title sectiontitle">中断流程</h2><div class="- topic/p p" data-ofbid="d259694e108__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_f4t_y5r_21c" src="../../../images/i2c/i2c_design_interrupt.png" width="384" alt="i2c_design_interrupt"/></div><br/></div></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="#i2c_key_procedures__section_unt_y5r_21c" data-tocid="i2c_key_procedures__section_unt_y5r_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#i2c_key_procedures__section_ul2_xvr_21c" data-tocid="i2c_key_procedures__section_ul2_xvr_21c">传输流程</a></div></li><li class="section-item"><div class="section-title"><a href="#i2c_key_procedures__section_ynt_y5r_21c" data-tocid="i2c_key_procedures__section_ynt_y5r_21c">I2C 模块总线信号</a></div></li><li class="section-item"><div class="section-title"><a href="#i2c_key_procedures__section_c4t_y5r_21c" data-tocid="i2c_key_procedures__section_c4t_y5r_21c">中断流程</a></div></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"><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_test.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">测试指南</h1><div class="date inPage">2 Dec 2024</div><div style="color: gray;">
|
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Read time: 2 minute(s)
|
||||
</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="i2c_test_guide__section_dq5_ksn_4dc" data-ofbid="i2c_test_guide__section_dq5_ksn_4dc"><h2 class="- topic/title title sectiontitle">测试环境</h2>
|
||||
|
||||
<div class="- topic/p p" data-ofbid="d51230e27__20250121171518">
|
||||
<ul class="- topic/ul ul" id="i2c_test_guide__ul_qhd_f5r_21c" data-ofbid="i2c_test_guide__ul_qhd_f5r_21c"><li class="- topic/li li" data-ofbid="d51230e30__20250121171518"><strong class="+ topic/ph hi-d/b ph b">硬件</strong><ul class="- topic/ul ul" id="i2c_test_guide__ul_e3z_d5r_21c" data-ofbid="i2c_test_guide__ul_e3z_d5r_21c"><li class="- topic/li li" data-ofbid="d51230e34__20250121171518">
|
||||
<p class="- topic/p p" data-ofbid="d51230e36__20250121171518">测试板：带有两个 C 接口的测试板</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d51230e39__20250121171518">
|
||||
<p class="- topic/p p" data-ofbid="d51230e41__20250121171518">PC：用于和测试板交互</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d51230e44__20250121171518">
|
||||
<p class="- topic/p p" data-ofbid="d51230e46__20250121171518">串口线：连接测试板的调试串口</p>
|
||||
</li></ul></li><li class="- topic/li li" data-ofbid="d51230e49__20250121171518"><strong class="+ topic/ph hi-d/b ph b">软件</strong><ul class="- topic/ul ul" id="i2c_test_guide__ul_g3z_d5r_21c" data-ofbid="i2c_test_guide__ul_g3z_d5r_21c"><li class="- topic/li li" data-ofbid="d51230e53__20250121171518">
|
||||
<p class="- topic/p p" data-ofbid="d51230e55__20250121171518">PC 端串口终端软件</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d51230e58__20250121171518">
|
||||
<p class="- topic/p p" data-ofbid="d51230e60__20250121171518">i2c-tools 第三方软件包</p>
|
||||
</li></ul></li></ul>
|
||||
</div>
|
||||
</section><section class="- topic/section section" id="i2c_test_guide__section_h3z_d5r_21c" data-ofbid="i2c_test_guide__section_h3z_d5r_21c"><h2 class="- topic/title title sectiontitle">测试配置</h2>
|
||||
|
||||
<p class="- topic/p p" data-ofbid="d51230e70__20250121171518">将测试板的两个 C，一个配置为 master，一个配置为 slave。两个 C 接口对接。 编译第三方测试工具 tools，利用 tools 提供的工具进行测试。</p>
|
||||
<div class="- topic/p p" data-ofbid="d51230e73__20250121171518">i2c-tools 测试：<ol class="- topic/ol ol" id="i2c_test_guide__ol_xgx_l5r_21c" data-ofbid="i2c_test_guide__ol_xgx_l5r_21c"><li class="- topic/li li" data-ofbid="d51230e76__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cdetect</strong><p class="- topic/p p" data-ofbid="d51230e79__20250121171518">i2cdetect 用于测试系统中有哪些 C 总线，以及 C
|
||||
总线上有哪些地址被使用</p><p class="- topic/p p" data-ofbid="d51230e81__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cdetect -l</strong> ：列出系统中所有的 C 总线</p><div class="- topic/p p" data-ofbid="d51230e85__20250121171518">
|
||||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_j3z_d5r_21c" src="../../../images/i2c/i2c_detect_1.png" alt="i2cdetect_1"/></div><br/>
|
||||
</div><p class="- topic/p p" data-ofbid="d51230e91__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cdetect -y -r 0</strong> ：查询 C-0 总线上哪些地址有挂接 I2C 设备。如下如所示，0x51 地址上有挂接
|
||||
C 设备</p><div class="- topic/p p" data-ofbid="d51230e95__20250121171518">
|
||||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_k3z_d5r_21c" src="../../../images/i2c/i2c_detect_2.png" alt="i2cdetect_2"/></div><br/>
|
||||
</div></li><li class="- topic/li li" data-ofbid="d51230e101__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cset</strong><p class="- topic/p p" data-ofbid="d51230e104__20250121171518">i2cset 用于每次向 C 设备写一个字节的数据</p><p class="- topic/p p" data-ofbid="d51230e106__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cset -f -y 0 0x54 1
|
||||
0x39</strong> ：I2C 从设备地址为 0x54，将从设备中地址 1 处的数据设置为 0x39</p><div class="- topic/p p" data-ofbid="d51230e110__20250121171518">
|
||||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_m3z_d5r_21c" src="../../../images/i2c/i2c_set.png" alt="i2cset"/></div><br/>
|
||||
</div></li><li class="- topic/li li" data-ofbid="d51230e116__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cget</strong><p class="- topic/p p" data-ofbid="d51230e119__20250121171518">i2cget 用于每次从 C 设备读取一个字节的数据</p><p class="- topic/p p" data-ofbid="d51230e121__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cget -f -y 0 0x54
|
||||
1</strong> ：I2C 从设备地址为 0x54，读取从设备数据地址为 1 处的 1 字节数据</p><div class="- topic/p p" data-ofbid="d51230e125__20250121171518">
|
||||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_o3z_d5r_21c" src="../../../images/i2c/i2c_get.png" alt="i2cget"/></div><br/>
|
||||
</div></li><li class="- topic/li li" data-ofbid="d51230e131__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2ctransfer</strong><p class="- topic/p p" data-ofbid="d51230e134__20250121171518">i2ctransfer 用于与 C
|
||||
设备之间传输数据，每次可读写多个数据</p><p class="- topic/p p" data-ofbid="d51230e136__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2ctransfer -f -y 0 w17@0x54 0 0x5a-</strong>
|
||||
：I2C 设备地址为 0x54，向从设备写入 16byte 数据，0 为将要写入数据的起始地址，写入的数据为
|
||||
0x5a，0x59，0x58…</p><div class="- topic/p p" data-ofbid="d51230e140__20250121171518">
|
||||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_q3z_d5r_21c" src="../../../images/i2c/i2c_transfer_1.png" alt="i2ctransfer_1"/></div><br/>
|
||||
</div><p class="- topic/p p" data-ofbid="d51230e146__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2ctransfer -f -y 0 w1@0x54 0 r16</strong> ：I2C 设备地址为 0x54，从 C 设备读取
|
||||
16byte 数据，读数据的起始地址为 0</p><div class="- topic/p p" data-ofbid="d51230e150__20250121171518">
|
||||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_r3z_d5r_21c" src="../../../images/i2c/i2c_transfer_2.png" alt="i2ctransfer_2"/></div><br/>
|
||||
</div></li><li class="- topic/li li" data-ofbid="d51230e156__20250121171518"><strong class="+ topic/ph hi-d/b ph b">eeprog</strong><p class="- topic/p p" data-ofbid="d51230e159__20250121171518">eeprog 是读写 eeprom 的工具，每次读写的 message 只有一个字节。若要读写 8 个字节，则会分成 8
|
||||
个 message 进行读写</p><p class="- topic/p p" data-ofbid="d51230e161__20250121171518"><strong class="+ topic/ph hi-d/b ph b">eeprog -f /dev/i2c-0 0x51 -r 0:8 -16</strong> ：I2C
|
||||
设备地址为 0x51，读取的数据起始地址是 0，读取 8byte 数据，-16 表示 C 设备的数据地址需要 16bit
|
||||
表示</p><p class="- topic/p p" data-ofbid="d51230e165__20250121171518"><strong class="+ topic/ph hi-d/b ph b">date | eeprog /dev/i2c-0 0x51 -w 0x200 -16</strong> ：将 date
|
||||
命令返回的数据写入到 eeprom 中，写入的起始地址是 0x200</p><div class="- topic/note note note note_note" id="i2c_test_guide__note_rnz_w5r_21c" data-ofbid="i2c_test_guide__note_rnz_w5r_21c"><span class="note__title">注：</span>
|
||||
<p class="- topic/p p" data-ofbid="d51230e171__20250121171518">i2c-tools 默认是不支持 eeprog 的编译的，并且使用 eeprog 时需要确保被操作的 eeprom 没有通过 DTS
|
||||
挂载到 I2C 总线，否则会一直返回该 eeprom 处于 busy 状态。</p>
|
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</div></li></ol></div>
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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="#i2c_test_guide__section_dq5_ksn_4dc" data-tocid="i2c_test_guide__section_dq5_ksn_4dc">测试环境</a></div></li><li class="section-item"><div class="section-title"><a href="#i2c_test_guide__section_h3z_d5r_21c" data-tocid="i2c_test_guide__section_h3z_d5r_21c">测试配置</a></div></li></ul></div>
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296
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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_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">I2C 使用指南</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"><div class="- topic/p p" data-ofbid="d109602e22__20250121171547">
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<div class="- topic/div div">
|
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<p class="- topic/p p" data-ofbid="d109602e26__20250121171547">I2C 模块是一种用于连接 CPU 主机与 I<sup class="+ topic/ph hi-d/sup ph sup">2</sup>C 总线之间的接口，包括一根串行数据线 (SDA) 和一根串行时钟线
|
||||
(SCL)，分别用于传输数据和时钟信号，是实现 I2C 通信的基础。在 I<sup class="+ topic/ph hi-d/sup ph sup">2</sup>C 总线上，每个设备都有一个唯一的地址。当主设备 (master)
|
||||
希望与从设备 (slave) 通信时，会通过发送从设备 (slave)
|
||||
的地址来建立连接。这种寻址方式允许在同一总线上连接多个设备，并进行精确的数据传输。主设备负责发起数据传输并生成时钟信号，而被主设备寻址的设备则作为从设备进行响应。这种主从关系确保了通信的有序性和有效性。此外，I2C
|
||||
支持多种传输模式，以满足不同的应用需求。</p>
|
||||
</div>
|
||||
<div class="table-container"><table class="- topic/table table frame-all" id="i2c_user_guide__table_w3g_mtr_21c" data-ofbid="i2c_user_guide__table_w3g_mtr_21c" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">术语定义</span></caption><colgroup><col style="width:28.732394366197184%"/><col style="width:28.169014084507044%"/><col style="width:43.098591549295776%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="i2c_user_guide__table_w3g_mtr_21c__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="i2c_user_guide__table_w3g_mtr_21c__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="i2c_user_guide__table_w3g_mtr_21c__entry__3">注释说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">SDA</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 数据线</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">-</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">SCL</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 时钟线</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">-</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">I2C algorithm</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 通信方法</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">提供产生 I2C 总线访问的通信函数</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">I2C adapter</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 适配器</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">对 I2C 控制器的软件抽象</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">I2C client</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 用户端</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">一个 client 对应一个 I2C device</td></tr></tbody></table></div>
|
||||
</div><section class="- topic/section section" id="i2c_user_guide__section_mb5_trn_4dc" data-ofbid="i2c_user_guide__section_mb5_trn_4dc"><h2 class="- topic/title title sectiontitle">模块特性</h2>
|
||||
|
||||
<div class="- topic/p p" data-ofbid="d109602e93__20250121171547">
|
||||
<ul class="- topic/ul ul" id="i2c_user_guide__ul_rcv_ktr_21c" data-ofbid="i2c_user_guide__ul_rcv_ktr_21c"><li class="- topic/li li" data-ofbid="d109602e96__20250121171547">
|
||||
<p class="- topic/p p" data-ofbid="d109602e98__20250121171547">支持主和从模式</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d109602e101__20250121171547">
|
||||
<p class="- topic/p p" data-ofbid="d109602e103__20250121171547">支持最高 400Kb/s 传输</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d109602e106__20250121171547">
|
||||
<p class="- topic/p p" data-ofbid="d109602e108__20250121171547">支持 7 bits 和 10 bits 寻址</p>
|
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</li><li class="- topic/li li" data-ofbid="d109602e111__20250121171547">
|
||||
<p class="- topic/p p" data-ofbid="d109602e113__20250121171547">支持时钟同步</p>
|
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</li><li class="- topic/li li" data-ofbid="d109602e116__20250121171547">
|
||||
<p class="- topic/p p" data-ofbid="d109602e118__20250121171547">支持中断和轮询模式</p>
|
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</li><li class="- topic/li li" data-ofbid="d109602e121__20250121171547">
|
||||
<p class="- topic/p p" data-ofbid="d109602e123__20250121171547">可编程 SDA 保持时间</p>
|
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</li><li class="- topic/li li" data-ofbid="d109602e126__20250121171547">
|
||||
<p class="- topic/p p" data-ofbid="d109602e128__20250121171547">可编程防止 I<sup class="+ topic/ph hi-d/sup ph sup">2</sup>C 通信异常总线挂死</p>
|
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</li></ul>
|
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</div>
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