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href="../../../topics/sdk/spi/spi_user_guide.html" id="spi-d3703e6352-link"><span class="ph">Q</span>SPI 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="uart_user_guide-d3703e6438" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d3703e6438-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide.html" id="uart_user_guide-d3703e6438-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_user_guide-d3703e6522" class="topicref" data-id="usb_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_user_guide-d3703e6522-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide.html" id="usb_user_guide-d3703e6522-link">USB 使用指南</a></div></div></li><li role="treeitem" 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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" 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" href="http://aicdocco/taskstopics/sdk/pwm/pwm_design_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1>
|
||
<div class="date inPage">9 Apr 2025</div><div style="color: gray;">
|
||
Read time: 3 minute(s)
|
||
</div>
|
||
<div class="- topic/body body">
|
||
<section class="- topic/section section" id="id__id2" data-ofbid="id__id2"><h2 class="- topic/title title sectiontitle">源码说明</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d122031e33__20250409171044">源代码位于 <code class="+ topic/ph pr-d/codeph ph codeph">bsp/artinchip/</code>：</p><ul class="- topic/ul ul simple" data-ofbid="d122031e38__20250409171044">
|
||
<li class="- topic/li li" data-ofbid="d122031e40__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e42__20250409171044"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv/pwm/drv_pwm.c</span>，PWM Driver 层实现</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d122031e48__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e50__20250409171044"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/hal/pwm/hal_pwm.c</span>，PWM HAL 层实现</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d122031e56__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e58__20250409171044"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/include/hal/hal_pwm.h</span>，PWM HAL 层接口头文件</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d122031e64__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e66__20250409171044"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv/epwm/drv_epwm.c</span>，EPWM Driver 层实现</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d122031e72__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e74__20250409171044"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/hal/pwmcs/hal_epwm.c</span>，EPWM HAL 层实现</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d122031e81__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e83__20250409171044"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/include/hal/hal_epwm.h</span>，EPWM HAL 层接口头文件</p>
|
||
</li>
|
||
</ul></section>
|
||
<section class="- topic/section section" id="id__id3" data-ofbid="id__id3"><h2 class="- topic/title title sectiontitle">模块架构</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d122031e95__20250409171044">PWM/ EPWM 驱动 Driver 层采用 RT-Thread 的 PWM 设备驱动框架。HAL 层也可以支持 Baremetal
|
||
方式或配合自定义的设备驱动框架进行使用。（下文仅以 PWM 作为说明，EPWM 同理）</p><figure class="- topic/fig fig fignone" id="id__id7" data-ofbid="id__id7">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/pwm/pwm_sw_system.png" alt="sw_system17"/></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">PWM 驱动的软件架构图</span></figcaption></figure>
|
||
</section>
|
||
<section class="- topic/section section" id="id__id4" data-ofbid="id__id4"><h2 class="- topic/title title sectiontitle">关键流程设计</h2>
|
||
|
||
<div class="- topic/div div section" id="id__id5">
|
||
<strong class="+ topic/ph hi-d/b ph b">初始化流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d122031e120__20250409171044">PWM 驱动的初始化接口通过 <code class="+ topic/ph pr-d/codeph ph codeph">INIT_DEVICE_EXPORT(drv_pwm_init)</code> 完成，主要是通过调用 PWM
|
||
子系统的接口 rt_device_pwm_register() 注册一个 PWM 设备。</p><p class="- topic/p p" data-ofbid="d122031e125__20250409171044">PWM 控制器的初始化过程，主要步骤有：</p><ol class="- topic/ol ol arabic simple" data-ofbid="d122031e127__20250409171044">
|
||
<li class="- topic/li li" data-ofbid="d122031e129__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e131__20250409171044">初始化模块的 clk</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d122031e135__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e137__20250409171044">初始化模块的默认参数</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d122031e141__20250409171044">
|
||
<p class="- topic/p p" data-ofbid="d122031e143__20250409171044">向设备框架中注册 PWM 设备</p>
|
||
</li>
|
||
</ol></div></section>
|
||
<section class="- topic/section section" id="id__id6" data-ofbid="id__id6"><h2 class="- topic/title title sectiontitle">数据结构设计</h2>
|
||
|
||
<div class="- topic/div div section" id="id__struct-aic-pwm-arg">
|
||
<strong class="+ topic/ph hi-d/b ph b">struct aic_pwm_arg</strong>
|
||
<div class="- topic/p p" data-ofbid="d122031e158__20250409171044">属于 HAL 层接口，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="id__codeblock_kjk_r33_fdc" data-ofbid="id__codeblock_kjk_r33_fdc"><strong class="hl-keyword">struct</strong> aic_pwm_arg {
|
||
u16 available;
|
||
u16 id;
|
||
<strong class="hl-keyword">enum</strong> aic_pwm_mode mode;
|
||
u32 tb_clk_rate;
|
||
u32 freq;
|
||
<strong class="hl-keyword">struct</strong> aic_pwm_action action0;
|
||
<strong class="hl-keyword">struct</strong> aic_pwm_action action1;
|
||
u32 period;
|
||
u32 duty;
|
||
s32 def_level;
|
||
<strong class="hl-keyword">enum</strong> pwm_polarity polarity;
|
||
};</pre></div></div><div class="- topic/div div section" id="id__struct-aic-pwm-action">
|
||
<strong class="+ topic/ph hi-d/b ph b">struct aic_pwm_action</strong>
|
||
<div class="- topic/p p" data-ofbid="d122031e167__20250409171044">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="id__codeblock_pvg_s33_fdc" data-ofbid="id__codeblock_pvg_s33_fdc"><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;
|
||
};</pre></div></div></section>
|
||
<section class="- topic/section section" id="id__driver" data-ofbid="id__driver"><h2 class="- topic/title title sectiontitle">Driver 层接口设计</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d122031e177__20250409171044">以下接口是 PWM 设备驱动框架需要的标准接口。 <pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_xs5_w33_fdc" data-ofbid="id__codeblock_xs5_w33_fdc"><strong class="hl-keyword">struct</strong> rt_pwm_ops
|
||
{
|
||
rt_err_t (*control)(<strong class="hl-keyword">struct</strong> rt_device_pwm *device, <strong class="hl-keyword">int</strong> cmd, <strong class="hl-keyword">void</strong> *arg);
|
||
};</pre></div><div class="table-container"><table class="- topic/table table frame-all" id="id__table_ry3_v33_fdc" data-ofbid="id__table_ry3_v33_fdc" 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">drv_pwm_control</span></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_ry3_v33_fdc__entry__1"><p class="- topic/p p" data-ofbid="d122031e197__20250409171044">函数原型</p></th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_ry3_v33_fdc__entry__2"><p class="- topic/p p" data-ofbid="d122031e201__20250409171044">rt_err_t drv_pwm_control(struct rt_device_pwm *device, int cmd,
|
||
void *arg)</p></th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ry3_v33_fdc__entry__1"><p class="- topic/p p" data-ofbid="d122031e211__20250409171044">功能说明</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_ry3_v33_fdc__entry__2"><p class="- topic/p p" data-ofbid="d122031e215__20250409171044">（类似 ioctl 的接口方式）配置一个 PWM 通道</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ry3_v33_fdc__entry__1"><p class="- topic/p p" data-ofbid="d122031e222__20250409171044">参数定义</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_ry3_v33_fdc__entry__2"><p class="- topic/p p" data-ofbid="d122031e226__20250409171044">
|
||
<div class="- topic/div div">
|
||
<div class="- topic/div div">device - 指向 PWM 设备的指针</div>
|
||
<div class="- topic/div div">cmd - ioctl 命令码</div>
|
||
<div class="- topic/div div">arg - 命令参数，指向 struct rt_pwm_configuration 结构的指针</div>
|
||
</div>
|
||
</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ry3_v33_fdc__entry__1"><p class="- topic/p p" data-ofbid="d122031e245__20250409171044">返回值</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_ry3_v33_fdc__entry__2"><p class="- topic/p p" data-ofbid="d122031e249__20250409171044">0，成功； < 0，失败</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_ry3_v33_fdc__entry__1"><p class="- topic/p p" data-ofbid="d122031e256__20250409171044">注意事项</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_ry3_v33_fdc__entry__2"><p class="- topic/p p" data-ofbid="d122031e260__20250409171044">-</p></td>
|
||
</tr>
|
||
</tbody></table></div></section>
|
||
<section class="- topic/section section" id="id__hal" data-ofbid="id__hal"><h2 class="- topic/title title sectiontitle">HAL 层接口设计</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d122031e273__20250409171044">HAL 层的函数接口声明存放在 hal_pwm.h
|
||
中，主要接口有：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_cvg_x33_fdc" data-ofbid="id__codeblock_cvg_x33_fdc"><strong class="hl-keyword">void</strong> hal_pwm_ch_init(u32 ch, <strong class="hl-keyword">enum</strong> aic_pwm_mode mode, u32 default_level,
|
||
<strong class="hl-keyword">struct</strong> aic_pwm_action *a0, <strong class="hl-keyword">struct</strong> aic_pwm_action *a1);
|
||
<strong class="hl-keyword">int</strong> hal_pwm_set(u32 ch, u32 duty_ns, u32 period_ns);
|
||
<strong class="hl-keyword">int</strong> hal_pwm_get(u32 ch, u32 *duty_ns, u32 *period_ns);
|
||
<strong class="hl-keyword">int</strong> hal_pwm_set_polarity(u32 ch, <strong class="hl-keyword">enum</strong> pwm_polarity polarity);
|
||
<strong class="hl-keyword">int</strong> hal_pwm_enable(u32 ch);
|
||
<strong class="hl-keyword">int</strong> hal_pwm_disable(u32 ch);
|
||
|
||
<strong class="hl-keyword">int</strong> hal_pwm_init(<strong class="hl-keyword">void</strong>);
|
||
<strong class="hl-keyword">int</strong> hal_pwm_deinit(<strong class="hl-keyword">void</strong>);
|
||
|
||
<strong class="hl-keyword">void</strong> hal_pwm_status_show(<strong class="hl-keyword">void</strong>);</pre></div></section>
|
||
<section class="- topic/section section" id="id__demo" data-ofbid="id__demo"><h2 class="- topic/title title sectiontitle">Demo</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d122031e283__20250409171044">本 Demo 实现了通过 PWM
|
||
来控制背光的亮度：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_kh5_x33_fdc" data-ofbid="id__codeblock_kh5_x33_fdc"><strong class="hl-keyword">void</strong> turn_on_lcd_backlight(<strong class="hl-keyword">void</strong>)
|
||
{
|
||
<strong class="hl-keyword">struct</strong> rt_device_pwm *pwm_dev;
|
||
|
||
<em class="hl-comment">/* turn on the LCD backlight */</em>
|
||
pwm_dev = (<strong class="hl-keyword">struct</strong> rt_device_pwm *)rt_device_find(<span class="hl-string">"pwm"</span>);
|
||
<em class="hl-comment">/* pwm frequency:100K = 10000ns */</em>
|
||
rt_pwm_set(pwm_dev, LCD_PWM_DEV_CHANNEL, <span class="hl-number">10000</span>, <span class="hl-number">10000</span>);
|
||
rt_pwm_enable(pwm_dev, LCD_PWM_DEV_CHANNEL);
|
||
}</pre></div></section>
|
||
|
||
|
||
</div>
|
||
</article></main></div>
|
||
|
||
|
||
|
||
|
||
|
||
|
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|
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<nav role="navigation" id="wh_topic_toc" aria-label="On this page" class="col-lg-2 d-none d-lg-block navbar d-print-none">
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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="#id__id2" data-tocid="id__id2">源码说明</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id3" data-tocid="id__id3">模块架构</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id4" data-tocid="id__id4">关键流程设计</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id6" data-tocid="id__id6">数据结构设计</a></div></li><li class="section-item"><div class="section-title"><a href="#id__driver" data-tocid="id__driver">Driver 层接口设计</a></div></li><li class="section-item"><div class="section-title"><a href="#id__hal" data-tocid="id__hal">HAL 层接口设计</a></div></li><li class="section-item"><div class="section-title"><a href="#id__demo" data-tocid="id__demo">Demo</a></div></li></ul></div>
|
||
|
||
</div>
|
||
</nav>
|
||
|
||
</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>
|
||
<div class="webhelp.fragment.footer">
|
||
<p class="p1">Copyright © 2019-2025 广东匠芯创科技有限公司. All rights reserved.</p>
|
||
</div>
|
||
<div>
|
||
<div class="generation_time">
|
||
Update Time: 2025-04-09
|
||
</div>
|
||
</div>
|
||
|
||
</div>
|
||
</footer>
|
||
|
||
<div id="go2top" class="d-print-none">
|
||
<span class="oxy-icon oxy-icon-up"></span>
|
||
</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> |