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<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/xpwm/xpwm_design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1><div class="date inPage">30 Oct 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</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>
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<p class="- topic/p p" data-ofbid="d285672e22__20250121171754">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="d285672e27__20250121171754"><li class="- topic/li li" data-ofbid="d285672e28__20250121171754">
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<p class="- topic/p p" data-ofbid="d285672e30__20250121171754">bsp/artinchip/drv/xpwm/drv_xpwm.c，XPWM/PWM Driver 层实现</p>
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</li><li class="- topic/li li" data-ofbid="d285672e33__20250121171754">
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<p class="- topic/p p" data-ofbid="d285672e35__20250121171754">bsp/artinchip/hal/xpwm/hal_xpwm.c，XPWM/PWM HAL 层实现</p>
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</li><li class="- topic/li li" data-ofbid="d285672e38__20250121171754">
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<p class="- topic/p p" data-ofbid="d285672e40__20250121171754">bsp/artinchip/include/hal/hal_xpwm.h，XPWM/PWM HAL 层接口头文件</p>
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</li></ul>
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</section><section class="- topic/section section" id="id__id3" data-ofbid="id__id3"><h2 class="- topic/title title sectiontitle">模块架构</h2>
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<p class="- topic/p p" data-ofbid="d285672e49__20250121171754">XPWM/PWM 驱动 Driver 层采用 RT-Thread 的 PWM 设备驱动框架。HAL 层也可以支持 Baremetal
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方式或配合自定义的设备驱动框架进行使用。</p>
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<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/xpwm/sw_system13.png" alt="sw_system13"/></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">XPWM/PWM 驱动的软件架构图</span></figcaption></figure>
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</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>
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<div class="- topic/div div section" id="id__id5">
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<strong class="+ topic/ph hi-d/b ph b">初始化流程</strong>
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<p class="- topic/p p" data-ofbid="d285672e69__20250121171754">XPWM/PWM 驱动的初始化接口通过 <code class="+ topic/ph pr-d/codeph ph codeph">INIT_DEVICE_EXPORT(drv_xpwm_init)</code> 完成，主要是通过调用
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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="d285672e74__20250121171754">XPWM/PWM
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控制器的初始化过程，主要步骤有：</p><ol class="- topic/ol ol arabic simple" data-ofbid="d285672e76__20250121171754"><li class="- topic/li li" data-ofbid="d285672e77__20250121171754">
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<p class="- topic/p p" data-ofbid="d285672e79__20250121171754">初始化模块的 clk</p>
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</li><li class="- topic/li li" data-ofbid="d285672e82__20250121171754">
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<p class="- topic/p p" data-ofbid="d285672e84__20250121171754">初始化模块的默认参数</p>
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</li><li class="- topic/li li" data-ofbid="d285672e87__20250121171754">
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<p class="- topic/p p" data-ofbid="d285672e89__20250121171754">向设备框架中注册 PWM 设备</p>
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</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>
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<div class="- topic/div div section" id="id__struct-aic-xpwm-arg">
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<strong class="+ topic/ph hi-d/b ph b">struct aic_xpwm_arg</strong>
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<div class="- topic/p p" data-ofbid="d285672e102__20250121171754">属于 HAL 层接口，记录每一个 PWM
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通道的配置信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_dbw_tj3_fdc" data-ofbid="id__codeblock_dbw_tj3_fdc"><strong class="hl-keyword">struct</strong> aic_xpwm_arg {
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u16 available;
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u16 id;
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u32 tb_clk_rate;
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u32 freq;
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u32 period;
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u32 duty;
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s32 def_level;
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u32 dma_en;
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u32 fifo_en;
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u32 fifo_th;
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u32 pul_limit_en;
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<strong class="hl-keyword">enum</strong> xpwm_polarity polarity;
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<strong class="hl-keyword">struct</strong> xpwm_int_s xpwm_int;
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<strong class="hl-keyword">struct</strong> aic_xpwm_transfer_info t_info;
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};</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>
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<div class="- topic/p p" data-ofbid="d285672e111__20250121171754">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_m55_5j3_fdc" data-ofbid="id__codeblock_m55_5j3_fdc"><strong class="hl-keyword">struct</strong> rt_pwm_ops
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{
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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);
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};</pre></div><div class="table-container"><table class="- topic/table table frame-all" id="id__table_ejd_vj3_fdc" data-ofbid="id__table_ejd_vj3_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_ejd_vj3_fdc__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_ejd_vj3_fdc__entry__2">static rt_err_t drv_xpwm_control(struct rt_device_pwm *device,
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int cmd, void *arg)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ejd_vj3_fdc__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_ejd_vj3_fdc__entry__2">（类似 ioctl 的接口方式）配置一个 XPWM/PWM 通道</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ejd_vj3_fdc__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_ejd_vj3_fdc__entry__2">
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<div class="- topic/div div">
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<div class="- topic/div div">device - 指向 XPWM/PWM 设备的指针</div>
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<div class="- topic/div div">cmd - ioctl 命令码</div>
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<div class="- topic/div div">arg - 命令参数，指向 struct rt_pwm_configuration 结构的指针</div>
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</div>
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</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ejd_vj3_fdc__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_ejd_vj3_fdc__entry__2">0，成功； < 0，失败</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_ejd_vj3_fdc__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_ejd_vj3_fdc__entry__2">-</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>
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<div class="- topic/p p" data-ofbid="d285672e165__20250121171754">HAL 层的函数接口声明存放在 hal_xpwm.h
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中，主要接口有：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_xcb_wj3_fdc" data-ofbid="id__codeblock_xcb_wj3_fdc"><strong class="hl-keyword">void</strong> hal_xpwm_ch_init(u32 ch, u32 default_level, <strong class="hl-keyword">enum</strong> xpwm_polarity polarity);
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<strong class="hl-keyword">int</strong> hal_xpwm_set(u32 ch, u32 duty_ns, u32 period_ns, u32 pulse_cnt);
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<strong class="hl-keyword">int</strong> hal_xpwm_get(u32 ch, u32 *duty_ns, u32 *period_ns);
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<strong class="hl-keyword">int</strong> hal_xpwm_enable(u32 ch);
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<strong class="hl-keyword">int</strong> hal_xpwm_disable(u32 ch);
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u32 hal_xpwm_int_stat(u32 ch);
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<strong class="hl-keyword">void</strong> hal_xpwm_int_clr(u32 ch, u32 mask);
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<strong class="hl-keyword">int</strong> hal_xpwm_set_fifo(u32 ch, u32 pul_num, u32 pul_prd, u32 pul_cmp);
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<strong class="hl-keyword">void</strong> hal_xpwm_cnt_en(u32 ch, u32 val);
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<strong class="hl-keyword">int</strong> hal_xpwm_is_enable(u32 ch);
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<strong class="hl-keyword">void</strong> hal_xpwm_resume(u32 ch);
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<strong class="hl-keyword">void</strong> hal_xpwm_fifo_flush(u32 ch);
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<strong class="hl-keyword">void</strong> hal_xpwm_irq_en_set(u32 ch, <strong class="hl-keyword">struct</strong> xpwm_int_s *xpwm_int);
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bool hal_ch_is_xpwm(u32 ch);
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<strong class="hl-keyword">int</strong> xpwm_cal_prd_duty(u32 ch, u32 duty_ns, u32 period_ns);
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#<strong class="hl-keyword">if</strong> defined (AIC_XPWM_FIFO_MODE) && defined (AIC_DMA_DRV)
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<strong class="hl-keyword">void</strong> hal_xpwm_dma_config(u32 ch, dma_async_callback callback, <strong class="hl-keyword">void</strong> *callback_param);
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#endif</pre></div><div class="- topic/note note tip note_tip" id="id__note_h4n_qn3_ddc" data-ofbid="id__note_h4n_qn3_ddc"><span class="note__title">提示：</span>
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<p class="- topic/p p" data-ofbid="d285672e171__20250121171754">硬件上 PWM 与 XPWM 为同一模块共 24 路。 驱动中的 PWM 是使用 XPWM 的 PWM 功能来实现，软件上划分 0-7 路为 XPWM， 8-23
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路为 PWM。</p>
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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></ul></div>
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</div>
|
||
|
||
|
||
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
||
|
||
|
||
</body>
|
||
</html> |