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class="title"><a 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/pwm/pwm_design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1>
|
||
|
||
<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
|
||
Read time: 5 minute(s)
|
||
</div>
|
||
<div class="- topic/body concept/conbody body conbody">
|
||
<p class="- topic/p p" data-ofbid="d188308e33__20250123155220">源代码位于：</p>
|
||
<ul class="- topic/ul ul" id="pwm_design_intro__ul_qyx_nks_21c" data-ofbid="pwm_design_intro__ul_qyx_nks_21c">
|
||
<li class="- topic/li li" data-ofbid="d188308e38__20250123155220">
|
||
<p class="- topic/p p" data-ofbid="d188308e40__20250123155220"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/pwm/pwm-artinchip.c</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d188308e45__20250123155220">
|
||
<p class="- topic/p p" data-ofbid="d188308e47__20250123155220"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/pwm/epwm-artinchip.c</span></p>
|
||
</li>
|
||
</ul>
|
||
<p class="- topic/p p" data-ofbid="d188308e53__20250123155220">EPWM 驱动设计与 PWM 驱动相同，本节仅以 PWM 驱动为例，详细描述 PWM 的设计思路。</p>
|
||
<section class="- topic/section section" id="pwm_design_intro__section_ryx_nks_21c" data-ofbid="pwm_design_intro__section_ryx_nks_21c"><h2 class="- topic/title title sectiontitle">模块架构</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d188308e61__20250123155220">Linux 提供了一个 PWM 子系统，使得在用户空间可以通过 sysfs 节点来控制 Backlight 背光。 整个软件框架如下图：</p>
|
||
<figure class="- topic/fig fig fignone" id="pwm_design_intro__fig_inh_qks_21c" data-ofbid="pwm_design_intro__fig_inh_qks_21c">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="pwm_design_intro__image_syx_nks_21c" src="../../../images/pwm/sw_system18.png" width="480" alt="sw_system18"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Linux PWM 子系统和 Backlight 子系统的软件关系</span></figcaption></figure>
|
||
<p class="- topic/p p" data-ofbid="d188308e76__20250123155220">上图可以看到 PWM 子系统中有两个概念：</p>
|
||
<ol class="- topic/ol ol" id="pwm_design_intro__ol_tyx_nks_21c" data-ofbid="pwm_design_intro__ol_tyx_nks_21c">
|
||
<li class="- topic/li li" data-ofbid="d188308e81__20250123155220">PWM Chip<p class="- topic/p p" data-ofbid="d188308e83__20250123155220">和硬件的 PWM 控制器一一对应，内核中维护了一个 chip 的链表。</p></li>
|
||
<li class="- topic/li li" data-ofbid="d188308e86__20250123155220">PWM Device<p class="- topic/p p" data-ofbid="d188308e88__20250123155220">和硬件的多路 PWM 通道一一对应，一个 chip 可以包含多个 device。</p></li>
|
||
</ol>
|
||
</section>
|
||
<section class="- topic/section section" id="pwm_design_intro__section_os4_f14_4dc" data-ofbid="pwm_design_intro__section_os4_f14_4dc"><h2 class="- topic/title title sectiontitle">关键流程设计</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d188308e98__20250123155220">
|
||
<ul class="- topic/ul ul" id="pwm_design_intro__ul_kc4_sks_21c" data-ofbid="pwm_design_intro__ul_kc4_sks_21c">
|
||
<li class="- topic/li li" data-ofbid="d188308e102__20250123155220">初始化流程<p class="- topic/p p" data-ofbid="d188308e104__20250123155220">PWM 驱动的初始化过程见 aic_pwm_probe()函数，除了普通 platform 设备的处理过程（申请 regs
|
||
资源、clk、reset）外，需要调用 PWM 子系统的接口 pwmchip_add()来注册一个 PWM
|
||
控制器。</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_design_intro__codeblock_txf_xks_21c" data-ofbid="pwm_design_intro__codeblock_txf_xks_21c"><code><strong class="hl-keyword">int</strong> pwmchip_add(<strong class="hl-keyword">struct</strong> pwm_chip *chip);</code></pre><p class="- topic/p p" data-ofbid="d188308e108__20250123155220">其中参数
|
||
chip 中关键信息有：通道数目、PWM 控制器的 ops 等，aic_pwm_ops
|
||
定义如下：</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_design_intro__codeblock_zmd_xks_21c" data-ofbid="pwm_design_intro__codeblock_zmd_xks_21c"><code><strong class="hl-keyword">static</strong> <strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> pwm_ops aic_pwm_ops = {
|
||
.free = aic_pwm_free,
|
||
.get_state = aic_pwm_get_state,
|
||
.config = aic_pwm_config,
|
||
.set_polarity = aic_pwm_set_polarity,
|
||
.enable = aic_pwm_enable,
|
||
.disable = aic_pwm_disable,
|
||
.owner = THIS_MODULE,
|
||
};</code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d188308e113__20250123155220">背光设备的初始化流程<p class="- topic/p p" data-ofbid="d188308e115__20250123155220">在 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="pwm_config.html#pwm_configuration__section_hqy_23s_21c">内核配置</a> 中，打开了
|
||
“Generic PWM based Backlight Driver” 选项对应的白光设备，驱动代码详见
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">drivers/video/backlight/pwm_bl.c</span>。其中
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">probe()</span> 函数中会调用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">devm_pwm_get()</span>来获取对应的 pwm
|
||
设备。</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_design_intro__codeblock_wgb_xks_21c" data-ofbid="pwm_design_intro__codeblock_wgb_xks_21c"><code>pwm_bl.c, pwm_backlight_probe()
|
||
-> pwm/core.c, devm_pwm_get()
|
||
-> aic_pwm_get_state()
|
||
-> pwm/core.c, pwm_apply_state()
|
||
-> aic_pwm_config()
|
||
-> aic_pwm_set_polarity()</code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d188308e133__20250123155220">中断处理流程<p class="- topic/p p" data-ofbid="d188308e135__20250123155220">PWM 的中断处理函数暂时为空，还不确定有哪些异常需要处理。</p></li>
|
||
</ul>
|
||
</div>
|
||
</section>
|
||
<section class="- topic/section section" id="pwm_design_intro__section_cpp_h14_4dc" data-ofbid="pwm_design_intro__section_cpp_h14_4dc"><h2 class="- topic/title title sectiontitle">数据结构设计</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d188308e147__20250123155220">
|
||
<ul class="- topic/ul ul" id="pwm_design_intro__ul_hwg_vks_21c" data-ofbid="pwm_design_intro__ul_hwg_vks_21c">
|
||
<li class="- topic/li li" data-ofbid="d188308e151__20250123155220">struct aic_pwm_arg：记录每一个 PWM
|
||
通道的配置信息<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_design_intro__codeblock_qfw_wks_21c" data-ofbid="pwm_design_intro__codeblock_qfw_wks_21c"><code><strong class="hl-keyword">struct</strong> aic_pwm_arg {
|
||
bool available;
|
||
<strong class="hl-keyword">enum</strong> aic_pwm_mode mode;
|
||
u32 tb_clk_rate;
|
||
u32 freq;
|
||
u32 db_red; <em class="hl-comment">/* Rising edge delay count of Dead-band */</em>
|
||
u32 db_fed; <em class="hl-comment">/* Failing edge delay count of Dead-band */</em>
|
||
<strong class="hl-keyword">struct</strong> aic_pwm_action action0;
|
||
<strong class="hl-keyword">struct</strong> aic_pwm_action action1;
|
||
u32 period;
|
||
bool def_level;
|
||
<strong class="hl-keyword">enum</strong> pwm_polarity polarity;
|
||
};</code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d188308e156__20250123155220">struct
|
||
aic_pwm_chip<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_design_intro__codeblock_ffz_fls_21c" data-ofbid="pwm_design_intro__codeblock_ffz_fls_21c"><code><strong class="hl-keyword">struct</strong> aic_pwm_chip {
|
||
<strong class="hl-keyword">struct</strong> pwm_chip chip;
|
||
<strong class="hl-keyword">struct</strong> attribute_group attrs;
|
||
<strong class="hl-keyword">struct</strong> aic_pwm_arg args[AIC_PWM_CH_NUM];
|
||
<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> pll_rate;
|
||
<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> clk_rate;
|
||
<strong class="hl-keyword">void</strong> __iomem *regs;
|
||
<strong class="hl-keyword">struct</strong> clk *clk;
|
||
<strong class="hl-keyword">struct</strong> reset_control *rst;
|
||
u32 irq;
|
||
};</code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d188308e161__20250123155220">struct aic_pwm_action：属于 HAL 层接口，记录一组 Action
|
||
的配置信息<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_design_intro__codeblock_dns_d2p_g1c" data-ofbid="pwm_design_intro__codeblock_dns_d2p_g1c"><code><strong class="hl-keyword">struct</strong> aic_pwm_action {
|
||
<strong class="hl-keyword">enum</strong> aic_pwm_action_type CBD;
|
||
<strong class="hl-keyword">enum</strong> aic_pwm_action_type CBU;
|
||
<strong class="hl-keyword">enum</strong> aic_pwm_action_type CAD;
|
||
<strong class="hl-keyword">enum</strong> aic_pwm_action_type CAU;
|
||
<strong class="hl-keyword">enum</strong> aic_pwm_action_type PRD;
|
||
<strong class="hl-keyword">enum</strong> aic_pwm_action_type ZRO;
|
||
};</code></pre></li>
|
||
</ul>
|
||
</div>
|
||
</section>
|
||
<section class="- topic/section section" id="pwm_design_intro__section_bh1_314_4dc" data-ofbid="pwm_design_intro__section_bh1_314_4dc"><h2 class="- topic/title title sectiontitle">接口设计</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d188308e174__20250123155220">以下接口是 Linux PWM 子系统需要的标准接口。</p>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="pwm_design_intro__table_gzx_nks_21c" data-ofbid="pwm_design_intro__table_gzx_nks_21c" data-cols="2"><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">aic_pwm_enable</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_design_intro__table_gzx_nks_21c__entry__1">函数原型</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_design_intro__table_gzx_nks_21c__entry__2">static int aic_pwm_enable(struct pwm_chip *chip, struct
|
||
pwm_device *pwm)</th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_gzx_nks_21c__entry__1">功能说明</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_gzx_nks_21c__entry__2">使能一个 pwm 通道（device）</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_gzx_nks_21c__entry__1">参数定义</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_gzx_nks_21c__entry__2">chip - 指向 chip 的指针 pwm - 指向 device 的指针</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_gzx_nks_21c__entry__1">返回值</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_gzx_nks_21c__entry__2">0，成功。 < 0，失败</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_design_intro__table_gzx_nks_21c__entry__1">注意事项</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_design_intro__table_gzx_nks_21c__entry__2">-</td>
|
||
</tr>
|
||
</tbody></table></div>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="pwm_design_intro__table_hzx_nks_21c" data-ofbid="pwm_design_intro__table_hzx_nks_21c" data-cols="2"><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"> 2</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_pwm_disable</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_design_intro__table_hzx_nks_21c__entry__1">函数原型</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_design_intro__table_hzx_nks_21c__entry__2">static void aic_pwm_disable(struct pwm_chip *chip, struct
|
||
pwm_device *pwm)</th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_hzx_nks_21c__entry__1">功能说明</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_hzx_nks_21c__entry__2">关闭一个 pwm 通道（device）</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_hzx_nks_21c__entry__1">参数定义</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_hzx_nks_21c__entry__2">chip - 指向 chip 的指针 pwm - 指向 device 的指针</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_hzx_nks_21c__entry__1">返回值</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_hzx_nks_21c__entry__2">-</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_design_intro__table_hzx_nks_21c__entry__1">注意事项</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_design_intro__table_hzx_nks_21c__entry__2">-</td>
|
||
</tr>
|
||
</tbody></table></div>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="pwm_design_intro__table_izx_nks_21c" data-ofbid="pwm_design_intro__table_izx_nks_21c" data-cols="2"><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"> 3</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_pwm_free</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_design_intro__table_izx_nks_21c__entry__1">函数原型</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_design_intro__table_izx_nks_21c__entry__2">static void aic_pwm_free(struct pwm_chip *chip, struct pwm_device
|
||
*pwm)</th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_izx_nks_21c__entry__1">功能说明</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_izx_nks_21c__entry__2">释放一个 pwm 通道（device），实际上是设置其 period 为 0（无效）</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_izx_nks_21c__entry__1">参数定义</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_izx_nks_21c__entry__2">chip - 指向 chip 的指针 pwm - 指向 device 的指针</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_izx_nks_21c__entry__1">返回值</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_izx_nks_21c__entry__2">无</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_design_intro__table_izx_nks_21c__entry__1">注意事项</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_design_intro__table_izx_nks_21c__entry__2">需要先调用 aic_pwm_disable()，再调用此接口</td>
|
||
</tr>
|
||
</tbody></table></div>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="pwm_design_intro__table_jzx_nks_21c" data-ofbid="pwm_design_intro__table_jzx_nks_21c" data-cols="2"><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"> 4</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_pwm_get_state</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_design_intro__table_jzx_nks_21c__entry__1">函数原型</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_design_intro__table_jzx_nks_21c__entry__2">static void aic_pwm_get_state(struct pwm_chip *chip, struct
|
||
pwm_device *pwm,struct pwm_state *state)</th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_jzx_nks_21c__entry__1">功能说明</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_jzx_nks_21c__entry__2">获取当前 PWM 控制器的配置信息。当使能 logo 功能时，U-Boot 中已经初始化过 PWM，所以 Linux 中需要从
|
||
PWM 控制器中同步一下当前状态</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_jzx_nks_21c__entry__1">参数定义</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_jzx_nks_21c__entry__2">chip - 指向 chip 的指针 pwm - 指向 device 的指针 state - 指向 state
|
||
的指针，用于返回当前 PWM 的状态信息</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_jzx_nks_21c__entry__1">返回值</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_jzx_nks_21c__entry__2">无</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_design_intro__table_jzx_nks_21c__entry__1">注意事项</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_design_intro__table_jzx_nks_21c__entry__2">-</td>
|
||
</tr>
|
||
</tbody></table></div>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="pwm_design_intro__table_kzx_nks_21c" data-ofbid="pwm_design_intro__table_kzx_nks_21c" data-cols="2"><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"> 5</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_pwm_config</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_design_intro__table_kzx_nks_21c__entry__1">函数原型</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_design_intro__table_kzx_nks_21c__entry__2">static int aic_pwm_config(struct pwm_chip *chip, struct
|
||
pwm_device *pwm,int duty_ns, int period_ns)</th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_kzx_nks_21c__entry__1">功能说明</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_kzx_nks_21c__entry__2">配置一个 pwm 通道（device）的占空比</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_kzx_nks_21c__entry__1">参数定义</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_kzx_nks_21c__entry__2">chip - 指向 chip 的指针 pwm - 指向 device 的指针 duty_ns - 一个 PWM 周期内的负载时长
|
||
period_ns - 一个 PWM 周期</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_kzx_nks_21c__entry__1">返回值</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_kzx_nks_21c__entry__2">0，成功。< 0，失败</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_design_intro__table_kzx_nks_21c__entry__1">注意事项</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_design_intro__table_kzx_nks_21c__entry__2">-</td>
|
||
</tr>
|
||
</tbody></table></div>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="pwm_design_intro__table_lzx_nks_21c" data-ofbid="pwm_design_intro__table_lzx_nks_21c" data-cols="2"><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"> 6</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_pwm_set_polarity</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_design_intro__table_lzx_nks_21c__entry__1">函数原型</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_design_intro__table_lzx_nks_21c__entry__2">static int aic_pwm_set_polarity(struct pwm_chip *chip, struct
|
||
pwm_device *pwm,enum pwm_polarity polarity)</th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_lzx_nks_21c__entry__1">功能说明</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_lzx_nks_21c__entry__2">配置一个 pwm 通道（device）的极性（是否需要翻转）</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_lzx_nks_21c__entry__1">参数定义</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_lzx_nks_21c__entry__2">chip - 指向 chip 的指针 pwm - 指向 device 的指针 polarity - 指定的极性</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_design_intro__table_lzx_nks_21c__entry__1">返回值</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_design_intro__table_lzx_nks_21c__entry__2">0，成功。< 0，失败</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_design_intro__table_lzx_nks_21c__entry__1">注意事项</td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_design_intro__table_lzx_nks_21c__entry__2">-</td>
|
||
</tr>
|
||
</tbody></table></div>
|
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</section>
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</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="#pwm_design_intro__section_ryx_nks_21c" data-tocid="pwm_design_intro__section_ryx_nks_21c">模块架构</a></div></li><li class="section-item"><div class="section-title"><a href="#pwm_design_intro__section_os4_f14_4dc" data-tocid="pwm_design_intro__section_os4_f14_4dc">关键流程设计</a></div></li><li class="section-item"><div class="section-title"><a href="#pwm_design_intro__section_cpp_h14_4dc" data-tocid="pwm_design_intro__section_cpp_h14_4dc">数据结构设计</a></div></li><li class="section-item"><div class="section-title"><a href="#pwm_design_intro__section_bh1_314_4dc" data-tocid="pwm_design_intro__section_bh1_314_4dc">接口设计</a></div></li></ul></div>
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