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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_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">参数配置</h1><div class="date inPage">5 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 body"><section class="- topic/section section" id="id__ref-lite-xpwm-cfg" data-ofbid="id__ref-lite-xpwm-cfg"><h2 class="- topic/title title sectiontitle">驱动配置</h2>
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<ol class="- topic/ol ol arabic simple" id="id__ol_dzx_nyh_ddc" data-ofbid="id__ol_dzx_nyh_ddc"><li class="- topic/li li" data-ofbid="d89914e23__20250121171530">
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<p class="- topic/p p" data-ofbid="d89914e25__20250121171530">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span>，进入 menuconfig
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的功能配置界面。</p>
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</li><li class="- topic/li li" data-ofbid="d89914e34__20250121171530">
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<p class="- topic/p p" data-ofbid="d89914e36__20250121171530">选择需要的 XPWM/PWM 通道。以下打开了部分 XPWM/PWM 通道：</p>
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</li></ol>
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<p class="- topic/p p" data-ofbid="d89914e40__20250121171530">3. 在 menuconfig 界面中打开 RT-Thread 的 XPWM/PWM 设备驱动框架。 使用 RT-Thread 内核的时，PWM/XPWM 驱动需要依赖
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RT-Thread 的 PWM 设备驱动框架。</p>
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<div class="- topic/note note tip note_tip" id="id__note_dnn_qn3_ddc" data-ofbid="id__note_dnn_qn3_ddc"><span class="note__title">提示：</span>
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<p class="- topic/p p" data-ofbid="d89914e45__20250121171530">为了简化使用，步骤 2 的 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">Using XPWMx/PWMx</span> 会自动打开 RT-Thread 的 PWM 设备驱动框架。</p>
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</div>
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</section><section class="- topic/section section" id="id__pwm" data-ofbid="id__pwm"><h2 class="- topic/title title sectiontitle">PWM 自定义参数</h2>
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<p class="- topic/p p" data-ofbid="d89914e57__20250121171530">XPWM 驱动在 drv_xpwm.c 中提供了一个接口 <code class="+ topic/ph pr-d/codeph ph codeph">aic_xpwm_default_action()</code> 来配置 XPWM/PWM
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各通道的行为参数。</p>
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<p class="- topic/p p" data-ofbid="d89914e63__20250121171530">如果因为板级硬件设计的差异，和实际应用场景不同，可以对这些参数进行调整。参数的定义如下表：</p>
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<div class="table-container"><table class="- topic/table table frame-all" id="id__table_ezx_nyh_ddc" data-ofbid="id__table_ezx_nyh_ddc" data-cols="4"><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"></span></caption><colgroup><col style="width:19.038817005545287%"/><col style="width:18.484288354898336%"/><col style="width:36.04436229205176%"/><col style="width:26.432532347504615%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_ezx_nyh_ddc__entry__1">参数名称</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_ezx_nyh_ddc__entry__2">类型</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_ezx_nyh_ddc__entry__3">取值范围</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_ezx_nyh_ddc__entry__4">功能说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ezx_nyh_ddc__entry__1">default-level</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ezx_nyh_ddc__entry__2">正整数</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_ezx_nyh_ddc__entry__3">[0, 1]</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_ezx_nyh_ddc__entry__4">默认/初始电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_ezx_nyh_ddc__entry__1">polarity</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_ezx_nyh_ddc__entry__2">数据结构</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_ezx_nyh_ddc__entry__3">NORMAL/INVERSED</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_ezx_nyh_ddc__entry__4">使能模块后，输出信号状态</td></tr></tbody></table></div>
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</section><section class="- topic/section section" id="id__id3" data-ofbid="id__id3"><h2 class="- topic/title title sectiontitle">时钟配置</h2>
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<p class="- topic/p p" data-ofbid="d89914e108__20250121171530">XPWM 计数器为 32-bit 的计数器，计数器时钟由系统时钟分频得出，分频系数为 CLK_DIV。驱动中默认配置计数器时钟为 24MHz。</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__ref-lite-xpwm-cfg" data-tocid="id__ref-lite-xpwm-cfg">驱动配置</a></div></li><li class="section-item"><div class="section-title"><a href="#id__pwm" data-tocid="id__pwm">PWM 自定义参数</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id3" data-tocid="id__id3">时钟配置</a></div></li></ul></div>
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doc/topics/sdk/xpwm/xpwm_debug.html
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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;">
|
||||
Read time: 2 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="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">
|
||||
<p class="- topic/p p" data-ofbid="d285672e30__20250121171754">bsp/artinchip/drv/xpwm/drv_xpwm.c，XPWM/PWM Driver 层实现</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d285672e33__20250121171754">
|
||||
<p class="- topic/p p" data-ofbid="d285672e35__20250121171754">bsp/artinchip/hal/xpwm/hal_xpwm.c，XPWM/PWM HAL 层实现</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d285672e38__20250121171754">
|
||||
<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>
|
||||
</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="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
|
||||
方式或配合自定义的设备驱动框架进行使用。</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/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>
|
||||
</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="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
|
||||
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
|
||||
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">
|
||||
<p class="- topic/p p" data-ofbid="d285672e79__20250121171754">初始化模块的 clk</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d285672e82__20250121171754">
|
||||
<p class="- topic/p p" data-ofbid="d285672e84__20250121171754">初始化模块的默认参数</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d285672e87__20250121171754">
|
||||
<p class="- topic/p p" data-ofbid="d285672e89__20250121171754">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-xpwm-arg">
|
||||
<strong class="+ topic/ph hi-d/b ph b">struct aic_xpwm_arg</strong>
|
||||
<div class="- topic/p p" data-ofbid="d285672e102__20250121171754">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_dbw_tj3_fdc" data-ofbid="id__codeblock_dbw_tj3_fdc"><strong class="hl-keyword">struct</strong> aic_xpwm_arg {
|
||||
u16 available;
|
||||
u16 id;
|
||||
u32 tb_clk_rate;
|
||||
u32 freq;
|
||||
u32 period;
|
||||
u32 duty;
|
||||
s32 def_level;
|
||||
u32 dma_en;
|
||||
u32 fifo_en;
|
||||
u32 fifo_th;
|
||||
u32 pul_limit_en;
|
||||
<strong class="hl-keyword">enum</strong> xpwm_polarity polarity;
|
||||
<strong class="hl-keyword">struct</strong> xpwm_int_s xpwm_int;
|
||||
<strong class="hl-keyword">struct</strong> aic_xpwm_transfer_info t_info;
|
||||
};</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="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
|
||||
{
|
||||
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_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,
|
||||
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">
|
||||
<div class="- topic/div div">
|
||||
<div class="- topic/div div">device - 指向 XPWM/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>
|
||||
</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>
|
||||
|
||||
<div class="- topic/p p" data-ofbid="d285672e165__20250121171754">HAL 层的函数接口声明存放在 hal_xpwm.h
|
||||
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);
|
||||
<strong class="hl-keyword">int</strong> hal_xpwm_set(u32 ch, u32 duty_ns, u32 period_ns, u32 pulse_cnt);
|
||||
<strong class="hl-keyword">int</strong> hal_xpwm_get(u32 ch, u32 *duty_ns, u32 *period_ns);
|
||||
<strong class="hl-keyword">int</strong> hal_xpwm_enable(u32 ch);
|
||||
<strong class="hl-keyword">int</strong> hal_xpwm_disable(u32 ch);
|
||||
u32 hal_xpwm_int_stat(u32 ch);
|
||||
<strong class="hl-keyword">void</strong> hal_xpwm_int_clr(u32 ch, u32 mask);
|
||||
<strong class="hl-keyword">int</strong> hal_xpwm_set_fifo(u32 ch, u32 pul_num, u32 pul_prd, u32 pul_cmp);
|
||||
<strong class="hl-keyword">void</strong> hal_xpwm_cnt_en(u32 ch, u32 val);
|
||||
<strong class="hl-keyword">int</strong> hal_xpwm_is_enable(u32 ch);
|
||||
<strong class="hl-keyword">void</strong> hal_xpwm_resume(u32 ch);
|
||||
<strong class="hl-keyword">void</strong> hal_xpwm_fifo_flush(u32 ch);
|
||||
<strong class="hl-keyword">void</strong> hal_xpwm_irq_en_set(u32 ch, <strong class="hl-keyword">struct</strong> xpwm_int_s *xpwm_int);
|
||||
bool hal_ch_is_xpwm(u32 ch);
|
||||
<strong class="hl-keyword">int</strong> xpwm_cal_prd_duty(u32 ch, u32 duty_ns, u32 period_ns);
|
||||
#<strong class="hl-keyword">if</strong> defined (AIC_XPWM_FIFO_MODE) && defined (AIC_DMA_DRV)
|
||||
<strong class="hl-keyword">void</strong> hal_xpwm_dma_config(u32 ch, dma_async_callback callback, <strong class="hl-keyword">void</strong> *callback_param);
|
||||
#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>
|
||||
<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
|
||||
路为 PWM。</p>
|
||||
</div>
|
||||
</section></div></article></main></div>
|
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161
doc/topics/sdk/xpwm/xpwm_faq.html
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161
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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_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>
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352
doc/topics/sdk/xpwm/xpwm_test.html
Normal file
352
doc/topics/sdk/xpwm/xpwm_test.html
Normal file
@@ -0,0 +1,352 @@
|
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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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|
||||
<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_test.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">测试指南</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
|
||||
Read time: 7 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">测试环境</h2>
|
||||
|
||||
<ul class="- topic/ul ul" id="id__ul_mdt_jj3_fdc" data-ofbid="id__ul_mdt_jj3_fdc"><li class="- topic/li li" data-ofbid="d155459e23__20250121171615"><strong class="+ topic/ph hi-d/b ph b">硬件</strong><ul class="- topic/ul ul simple" id="id__ul_kvn_pyh_ddc" data-ofbid="id__ul_kvn_pyh_ddc"><li class="- topic/li li" data-ofbid="d155459e27__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e29__20250121171615">FPGA 验证版</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e32__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e34__20250121171615">示波器，用于观察输出 XPWM/PWM 信号的波形</p>
|
||||
</li></ul></li><li class="- topic/li li" data-ofbid="d155459e37__20250121171615"><strong class="+ topic/ph hi-d/b ph b">软件</strong><ul class="- topic/ul ul simple" id="id__ul_lvn_pyh_ddc" data-ofbid="id__ul_lvn_pyh_ddc"><li class="- topic/li li" data-ofbid="d155459e41__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e43__20250121171615">PC 端的串口终端软件，用于 PC 和开发板进行串口通信</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e46__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e48__20250121171615">RT-Thread 系统自带的 <code class="+ topic/ph pr-d/codeph ph codeph">pwm</code> 命令行工具</p>
|
||||
</li></ul></li><li class="- topic/li li" data-ofbid="d155459e54__20250121171615"><strong class="+ topic/ph hi-d/b ph b">软件配置</strong><p class="- topic/p p" data-ofbid="d155459e57__20250121171615">当打开 RT-Thread 系统的 PWM 设备驱动框架，就会在启动时注册生成 <code class="+ topic/ph pr-d/codeph ph codeph">pwm</code>
|
||||
命令。</p></li></ul></section><section class="- topic/section section" id="id__xpwm-pwm" data-ofbid="id__xpwm-pwm"><h2 class="- topic/title title sectiontitle">测试 XPWM/PWM</h2>
|
||||
|
||||
<p class="- topic/p p" data-ofbid="d155459e67__20250121171615"><span class="+ topic/keyword sw-d/cmdname keyword cmdname">pwm</span> 命令帮助信息如下：</p>
|
||||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_mvn_pyh_ddc" data-ofbid="id__codeblock_mvn_pyh_ddc">spss /> pwm
|
||||
Usage:
|
||||
pwm probe <device name> - probe pwm by name
|
||||
pwm enable <channel> - enable pwm channel
|
||||
pwm disable <channel> - disable pwm channel
|
||||
pwm get <channel> - get pwm channel info
|
||||
pwm set <channel> <period> <pulse> <pulse cnt> - set pwm channel info
|
||||
pwm set_fifo_num <channel> <fifo_num> - set xpwm fifo count
|
||||
pwm set_fifo <channel> <fifo_index> <period> <pulse> <pulse cnt> - set xpwm fifo info
|
||||
pwm get_fifo <channel> - get xpwm fifo info
|
||||
pwm dma_test <channel> <loop_times> - xpwm dma test</pre>
|
||||
<p class="- topic/p p" data-ofbid="d155459e75__20250121171615">测试前应先注册设备：</p>
|
||||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_nvn_pyh_ddc" data-ofbid="id__codeblock_nvn_pyh_ddc">aic> pwm probe xpwm
|
||||
probe xpwm success
|
||||
</pre>
|
||||
<p class="- topic/p p" data-ofbid="d155459e82__20250121171615">
|
||||
<strong class="+ topic/ph hi-d/b ph b">- 使用举例 1： XPWM 自由方式演示。</strong>
|
||||
</p>
|
||||
<ol class="- topic/ol ol arabic simple" id="id__ol_ovn_pyh_ddc" data-ofbid="id__ol_ovn_pyh_ddc"><li class="- topic/li li" data-ofbid="d155459e89__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e91__20250121171615">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span>，进入 menuconfig
|
||||
的功能配置界面，将 XPWM
|
||||
配置为普通模式：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_pvn_pyh_ddc" data-ofbid="id__codeblock_pvn_pyh_ddc">Board options --->
|
||||
Select ALL XPWM MODE (normal mode) --->
|
||||
</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e102__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e104__20250121171615">配置输出频率为 1KHz，占空比为 80% 的 7
|
||||
个脉冲。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_rvn_pyh_ddc" data-ofbid="id__codeblock_rvn_pyh_ddc">aic> pwm set010000008000007
|
||||
pwm info set on xpwm at channel <span class="hl-number">0</span></pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e109__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e111__20250121171615">观察示波器，可以见到输出了 7 个脉冲。</p>
|
||||
</li></ol>
|
||||
<p class="- topic/p p" data-ofbid="d155459e115__20250121171615">
|
||||
<strong class="+ topic/ph hi-d/b ph b">- 使用举例 2： XPWM 持续输出功能演示。</strong>
|
||||
</p>
|
||||
<ol class="- topic/ol ol arabic simple" id="id__ol_tvn_pyh_ddc" data-ofbid="id__ol_tvn_pyh_ddc"><li class="- topic/li li" data-ofbid="d155459e122__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e124__20250121171615">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span>，进入 menuconfig
|
||||
的功能配置界面，将 XPWM
|
||||
配置为连续模式：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_uvn_pyh_ddc" data-ofbid="id__codeblock_uvn_pyh_ddc">Board options --->
|
||||
Select ALL XPWM MODE (continuous mode) --->
|
||||
</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e135__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e137__20250121171615">配置输出中断频率为 1KHz，占空比为
|
||||
30%，任意个数脉冲。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_wvn_pyh_ddc" data-ofbid="id__codeblock_wvn_pyh_ddc">aic> pwm set010000003000007
|
||||
pwm info set on xpwm at channel <span class="hl-number">0</span></pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e142__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e144__20250121171615">观察示波器，可以见到连续输出的 PWM。</p>
|
||||
</li></ol>
|
||||
<p class="- topic/p p" data-ofbid="d155459e148__20250121171615">
|
||||
<strong class="+ topic/ph hi-d/b ph b">- 使用举例 3： XPWM 中断配置 FIFO 方式演示。</strong>
|
||||
</p>
|
||||
<ol class="- topic/ol ol arabic simple" id="id__ol_yvn_pyh_ddc" data-ofbid="id__ol_yvn_pyh_ddc"><li class="- topic/li li" data-ofbid="d155459e155__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e157__20250121171615">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span>，进入 menuconfig
|
||||
的功能配置界面，将 XPWM 配置为使用 FIFO 模式，同时关闭 DMA
|
||||
支持：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_zvn_pyh_ddc" data-ofbid="id__codeblock_zvn_pyh_ddc">Board options --->
|
||||
Select ALL XPWM MODE (fifo mode) --->
|
||||
......
|
||||
[ ] Using DMA
|
||||
</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e168__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e170__20250121171615">XPWM 最大支持 8 组 FIFO，其中每组深度为 3*32bits。 此处演示 XPWM 通道 0 设置 5 组 FIFO，通道 1 设置 1 组
|
||||
FIFO，通道 2 设置 1 组 FIFO，通道 3 设置 2 组
|
||||
FIFO。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_bwn_pyh_ddc" data-ofbid="id__codeblock_bwn_pyh_ddc">aic> pwm set_fifo <span class="hl-number">0010000001000001</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">0</span>
|
||||
aic> pwm set_fifo <span class="hl-number">015000002000002</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">0</span>
|
||||
aic> pwm set_fifo <span class="hl-number">025000003000003</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">0</span>
|
||||
aic> pwm set_fifo <span class="hl-number">032000001000001</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">0</span>
|
||||
aic> pwm set_fifo <span class="hl-number">043000002000002</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">0</span>
|
||||
aic> pwm set_fifo_num <span class="hl-number">05</span>
|
||||
pwm set fifo num on xpwm at channel <span class="hl-number">0</span>
|
||||
aic> pwm set_fifo <span class="hl-number">1010000005000001</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">1</span>
|
||||
aic> pwm set_fifo_num <span class="hl-number">11</span>
|
||||
pwm set fifo num on xpwm at channel <span class="hl-number">1</span>
|
||||
aic> pwm set_fifo <span class="hl-number">2010000003000001</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">2</span>
|
||||
aic> pwm set_fifo_num <span class="hl-number">21</span>
|
||||
pwm set fifo num on xpwm at channel <span class="hl-number">2</span>
|
||||
aic> pwm set_fifo <span class="hl-number">3010000001000002</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">3</span>
|
||||
aic> pwm set_fifo <span class="hl-number">3110000002000003</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">3</span>
|
||||
aic> pwm set_fifo_num <span class="hl-number">32</span>
|
||||
pwm set fifo num on xpwm at channel <span class="hl-number">3</span></pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e175__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e177__20250121171615">使能通道 0/1/2/3。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_dwn_pyh_ddc" data-ofbid="id__codeblock_dwn_pyh_ddc">aic>pwm enable0
|
||||
aic>pwm enable1
|
||||
aic>pwm enable2
|
||||
aic>pwm enable3</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e182__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e184__20250121171615">可以获取当前 XPWM 通道的 FIFO
|
||||
信息。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_fwn_pyh_ddc" data-ofbid="id__codeblock_fwn_pyh_ddc">aic> pwm get_fifo <span class="hl-number">0</span>[<span class="hl-number">179795</span>] I/XPWM: ch0 fifo valid count: <span class="hl-number">5</span>[<span class="hl-number">179800</span>] I/XPWM: fifo_idx <span class="hl-number">0</span>: prd:<span class="hl-number">1000000</span> pulse:<span class="hl-number">100000</span> pulse cnt:<span class="hl-number">1</span>
|
||||
[<span class="hl-number">179808</span>] I/XPWM: fifo_idx <span class="hl-number">1</span>: prd:<span class="hl-number">500000</span> pulse:<span class="hl-number">200000</span> pulse cnt:<span class="hl-number">2</span>
|
||||
[<span class="hl-number">179815</span>] I/XPWM: fifo_idx <span class="hl-number">2</span>: prd:<span class="hl-number">500000</span> pulse:<span class="hl-number">300000</span> pulse cnt:<span class="hl-number">3</span>
|
||||
[<span class="hl-number">179823</span>] I/XPWM: fifo_idx <span class="hl-number">3</span>: prd:<span class="hl-number">200000</span> pulse:<span class="hl-number">100000</span> pulse cnt:<span class="hl-number">1</span>
|
||||
[<span class="hl-number">179830</span>] I/XPWM: fifo_idx <span class="hl-number">4</span>: prd:<span class="hl-number">300000</span> pulse:<span class="hl-number">200000</span> pulse cnt:<span class="hl-number">2</span>
|
||||
</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e189__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e191__20250121171615">观察示波器，可以看到 XPWM 在不断输出 FIFO 中的脉冲组合。</p>
|
||||
</li></ol>
|
||||
<p class="- topic/p p" data-ofbid="d155459e196__20250121171615">
|
||||
<strong class="+ topic/ph hi-d/b ph b">- 使用举例 4： XPWM DMA 配置 FIFO 方式演示。</strong>
|
||||
</p>
|
||||
<ol class="- topic/ol ol arabic simple" id="id__ol_hwn_pyh_ddc" data-ofbid="id__ol_hwn_pyh_ddc"><li class="- topic/li li" data-ofbid="d155459e203__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e205__20250121171615">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span>，进入 menuconfig
|
||||
的功能配置界面，将 XPWM 配置为使用 FIFO 模式，同时打开 DMA
|
||||
支持：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_iwn_pyh_ddc" data-ofbid="id__codeblock_iwn_pyh_ddc">Board options --->
|
||||
Select ALL XPWM MODE (fifo mode) --->
|
||||
......
|
||||
[*] Using DMA
|
||||
</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e216__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e218__20250121171615">先使能通道 0/1/2/3。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_kwn_pyh_ddc" data-ofbid="id__codeblock_kwn_pyh_ddc">aic>pwm enable0
|
||||
aic>pwm enable1
|
||||
aic>pwm enable2
|
||||
aic>pwm enable3</pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e223__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e225__20250121171615">手动设置 FIFO。 FIFO INDEX 参数将会被忽略，此处只能设置一个 FIFO
|
||||
进行测试。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_mwn_pyh_ddc" data-ofbid="id__codeblock_mwn_pyh_ddc">aic > pwm set_fifo <span class="hl-number">0010000003000005</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">0</span>
|
||||
aic > pwm set_fifo <span class="hl-number">106000005000003</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">1</span>
|
||||
aic > pwm set_fifo <span class="hl-number">208000005000007</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">2</span>
|
||||
aic > pwm set_fifo <span class="hl-number">3020003807</span>
|
||||
pwm set fifo on xpwm at channel <span class="hl-number">3</span></pre></div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e230__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e232__20250121171615">观察示波器。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e235__20250121171615">
|
||||
<div class="- topic/p p" data-ofbid="d155459e237__20250121171615">进行 DMA 循环测试，循环输出代码中的组合 N 次，此处演示 3
|
||||
次。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_own_pyh_ddc" data-ofbid="id__codeblock_own_pyh_ddc">aic > pwm dma_test <span class="hl-number">03</span>
|
||||
xpwm ch0 will loop <span class="hl-number">3</span>times</pre></div>
|
||||
<div class="- topic/note note tip note_tip" id="id__note_xnn_qn3_ddc" data-ofbid="id__note_xnn_qn3_ddc"><span class="note__title">提示：</span>
|
||||
<ol class="- topic/ol ol arabic simple" type="a" id="id__ol_pwn_pyh_ddc" data-ofbid="id__ol_pwn_pyh_ddc"><li class="- topic/li li" data-ofbid="d155459e245__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e247__20250121171615"><code class="+ topic/ph pr-d/codeph ph codeph">dma_test</code> 中，会将 BUFF 中的数据循环输出，此处作演示，仅使用了一个 BUFF
|
||||
空间，没有区分通道，故每个通道不能同时调用 <code class="+ topic/ph pr-d/codeph ph codeph">dma_test</code> 。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e255__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e257__20250121171615"><code class="+ topic/ph pr-d/codeph ph codeph">dma_test</code> 中输出的测试组合，在源码 rt_drv_pwm.c 中。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e262__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e264__20250121171615">由于单组 FIFO 数据大小为 3*32bits,不符合清 CACHE
|
||||
数据大小对齐，会出现相关警告为正常现象，不影响使用。</p>
|
||||
<p class="- topic/p p" data-ofbid="d155459e267__20250121171615">测试组合如下：</p>
|
||||
</li></ol>
|
||||
</div>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e272__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e274__20250121171615">观察示波器。</p>
|
||||
</li></ol>
|
||||
<p class="- topic/p p" data-ofbid="d155459e278__20250121171615">
|
||||
<strong class="+ topic/ph hi-d/b ph b">- 使用举例 5： XPWM 中断配置 FIFO 方式演示。</strong>
|
||||
</p>
|
||||
<ol class="- topic/ol ol arabic simple" id="id__ol_rwn_pyh_ddc" data-ofbid="id__ol_rwn_pyh_ddc"><li class="- topic/li li" data-ofbid="d155459e285__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e287__20250121171615">PWM 功能下 <code class="+ topic/ph pr-d/codeph ph codeph">pulse_cnt</code> 参数将被忽略,配置输出频率为 1KHz，占空比为 80%。</p>
|
||||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_swn_pyh_ddc" data-ofbid="id__codeblock_swn_pyh_ddc">aic> pwm set810000008000000
|
||||
pwm info set on xpwm at channel <span class="hl-number">8</span></pre>
|
||||
</li><li class="- topic/li li" data-ofbid="d155459e296__20250121171615">
|
||||
<p class="- topic/p p" data-ofbid="d155459e298__20250121171615">观察示波器，可以见到相应的 PWM 波。</p>
|
||||
<div class="- topic/note note tip note_tip" id="id__note_ynn_qn3_ddc" data-ofbid="id__note_ynn_qn3_ddc"><span class="note__title">提示：</span>
|
||||
<p class="- topic/p p" data-ofbid="d155459e303__20250121171615">XPWM 通道为 0-7，PWM 通道为 8-23。</p>
|
||||
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|
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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_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">XPWM 使用指南</h1><div class="date inPage">29 Nov 2024</div><div style="color: gray;">
|
||||
Read time: 1 minute(s)
|
||||
</div><div class="- topic/body body"><div class="table-container"><table class="- topic/table table frame-all" data-ofbid="d301612e17__20250121171807" 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">术语定义</span></caption><colgroup><col/><col/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__entry__1">术语/缩略语</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__entry__2">定义及说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__entry__1">XPWM</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__entry__2">Extend Pulse-Width
|
||||
Modulation，拓展脉冲宽度控制，简称脉宽调制</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__entry__1">占空比</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__entry__2">PWM 信号中，高电平保持的时间 与 该 PWM 时钟周期的时间之比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__entry__1">FIFO</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__entry__2">First In First Out, 先进先出数据存储、缓冲器</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__entry__1">DMA</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__entry__2">Direct Memory Access,直接内存访问</td></tr></tbody></table></div><section class="- topic/section section" id="id__section_wzb_cj3_fdc" data-ofbid="id__section_wzb_cj3_fdc"><h2 class="- topic/title title sectiontitle">XPWM 功能简介</h2>
|
||||
|
||||
<div class="- topic/div div section" id="id__pwm">
|
||||
<strong class="+ topic/ph hi-d/b ph b">PWM 输出模式</strong>
|
||||
<p class="- topic/p p" data-ofbid="d301612e60__20250121171807"> PWM 信号通常由一列占空比不同的矩形脉冲构成，其占空比可以调节。用数字输出来控制 PWM 占空比，占空比提高意味着高电平脉宽增大，输出的能量就会增加，PWM
|
||||
就相当于一个 <strong class="+ topic/ph hi-d/b ph b">功率版的 DA 转换模块</strong>。下图是一个典型的 PWM 信号波形：</p><figure class="- topic/fig fig fignone" id="id__id4" data-ofbid="id__id4"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/xpwm/pwm_wave.png" alt="pwm_wave"/></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">图 6.106 典型的 PWM 信号波形</span></figcaption></figure>
|
||||
<p class="- topic/p p" data-ofbid="d301612e72__20250121171807">占空比的计算方法： <code class="+ topic/ph pr-d/codeph ph codeph">占空比=(脉宽时间/周期)*100%</code></p><p class="- topic/p p" data-ofbid="d301612e76__20250121171807">结合上图，我们可以说： 脉宽时间 1 相比 脉宽时间 2
|
||||
提供较小的占空比。</p>
|
||||
</div>
|
||||
<div class="- topic/div div section" id="id__id3">
|
||||
<strong class="+ topic/ph hi-d/b ph b">脉冲输出模式</strong>
|
||||
<p class="- topic/p p" data-ofbid="d301612e85__20250121171807">脉冲输出模式支持三种方式实现脉冲输出的功能，分别是自由方式（未采用中断和 DMA）、持续方式（采用中断）、FIFO（采用中断或 DMA）方式。</p><ol class="- topic/ol ol arabic simple" data-ofbid="d301612e87__20250121171807"><li class="- topic/li li" data-ofbid="d301612e88__20250121171807">
|
||||
<p class="- topic/p p" data-ofbid="d301612e90__20250121171807"> 自由方式输出脉冲，每设置一次发送脉冲数量的数值，XPWM 输出则发送相应数量的脉冲后则处于一直 IDLE 的状态（IDLE
|
||||
状态可以设置为输出高电平或低电平）。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d301612e93__20250121171807">
|
||||
<p class="- topic/p p" data-ofbid="d301612e95__20250121171807"> 持续方式输出脉冲，即通过中断，每次中断函数进行设置下次发送脉冲数量的数值，XPWM 输出则一直按照设置的数值持续发送脉冲。</p>
|
||||
</li><li class="- topic/li li" data-ofbid="d301612e98__20250121171807">
|
||||
<p class="- topic/p p" data-ofbid="d301612e100__20250121171807">FIFO 方式输出脉冲，是利用内置的 FIFO
|
||||
对影子寄存器的更新方式，实现持续发送脉冲。这样相对上面提到的持续方式，可以大大提高脉冲输出的效率，避免频繁进入中断函数。</p>
|
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