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class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/spi/spi_user_guide_2.html" id="spi-d5856e5805-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-d5856e5879" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d5856e5879-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide_2.html" id="uart_user_guide-d5856e5879-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_user_guide-d5856e5951" class="topicref" data-id="usb_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_user_guide-d5856e5951-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide_2.html" id="usb_user_guide-d5856e5951-link">USB 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e6011" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e6011-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/mac/mac_user_guide_2.html" id="id-d5856e6011-link">MAC 使用指南</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d5856e6083" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d5856e6083-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d5856e6083-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 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/pwm/pwm_test_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">测试指南</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
|
||
Read time: 4 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_f5w_n31_tdc" data-ofbid="id__ul_f5w_n31_tdc"><li class="- topic/li li" data-ofbid="d179551e25__20250121171624">
|
||
<div class="- topic/div div section" id="id__id3">
|
||
<strong class="+ topic/ph hi-d/b ph b">硬件</strong>
|
||
<ul class="- topic/ul ul simple" id="id__ul_wcz_n31_tdc" data-ofbid="id__ul_wcz_n31_tdc"><li class="- topic/li li" data-ofbid="d179551e33__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e35__20250121171624">开发板</p>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e38__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e40__20250121171624">示波器，用于观察输出 PWM 信号的波形</p>
|
||
</li></ul></div>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e44__20250121171624">
|
||
<div class="- topic/div div section" id="id__id4">
|
||
<strong class="+ topic/ph hi-d/b ph b">软件</strong>
|
||
<ul class="- topic/ul ul simple" id="id__ul_ldb_431_tdc" data-ofbid="id__ul_ldb_431_tdc"><li class="- topic/li li" data-ofbid="d179551e52__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e54__20250121171624">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="d179551e57__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e59__20250121171624">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></div>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e66__20250121171624">
|
||
<div class="- topic/div div section" id="id__id5">
|
||
<strong class="+ topic/ph hi-d/b ph b">软件配置</strong>
|
||
<p class="- topic/p p" data-ofbid="d179551e73__20250121171624">打开 RT-Thread 系统的 PWM 设备驱动框架，会在启动时注册生成 <code class="+ topic/ph pr-d/codeph ph codeph">pwm</code> 命令。</p></div>
|
||
</li></ul></section><section class="- topic/section section" id="id__pwm" data-ofbid="id__pwm"><h2 class="- topic/title title sectiontitle">动态配置 PWM</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d179551e84__20250121171624">使用 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">pwm</span> 命令来配置某一通道的步骤如下所示，以通道 3 为例：</p><ol class="- topic/ol ol arabic simple" data-ofbid="d179551e89__20250121171624"><li class="- topic/li li" data-ofbid="d179551e90__20250121171624">列示所有 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">pwm</span>
|
||
相关命：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_udh_dg1_tdc" data-ofbid="id__codeblock_udh_dg1_tdc">pwm</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_r25_dg1_tdc" data-ofbid="id__codeblock_r25_dg1_tdc">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_pul <channel> <irq_mode> <period> <pulse> <pulse cnt> - set pwm pulse
|
||
pwm set <channel> <period> <pulse> - set pwm channel info
|
||
</pre></li><li class="- topic/li li" data-ofbid="d179551e99__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e101__20250121171624">使用 <span class="+ topic/keyword pr-d/parmname keyword parmname">probe</span> 参数，选择一个 PWM 设备（PWM/EPWM）。</p>
|
||
<div class="- topic/p p" data-ofbid="d179551e107__20250121171624"><span class="+ topic/keyword sw-d/cmdname keyword cmdname">pwm</span> 命令只支持 probe 一个设备，假设设备名称为
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">pwm</code>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_r4d_2g1_tdc" data-ofbid="id__codeblock_r4d_2g1_tdc">pwm probe pwm</pre></div>
|
||
<div class="- topic/p p" data-ofbid="d179551e117__20250121171624">系统输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_aqs_fg1_tdc" data-ofbid="id__codeblock_aqs_fg1_tdc">probe pwm success</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e122__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e124__20250121171624">使用 <span class="+ topic/keyword pr-d/parmname keyword parmname">set</span> 参数，分别设置通道 3 的周期和占空比。</p>
|
||
<div class="- topic/p p" data-ofbid="d179551e130__20250121171624">例如，将周期设置为 1,000,000 微秒，占空比设置为
|
||
60%：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_v34_jg1_tdc" data-ofbid="id__codeblock_v34_jg1_tdc">pwm set <span class="hl-number">3</span> <span class="hl-number">1000000</span> <span class="hl-number">600000</span></pre></div>
|
||
<div class="- topic/p p" data-ofbid="d179551e135__20250121171624">系统输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_zsg_kg1_tdc" data-ofbid="id__codeblock_zsg_kg1_tdc">pwm info set on pwm at channel <span class="hl-number">3</span></pre></div>
|
||
<p class="- topic/p p" data-ofbid="d179551e140__20250121171624">在修改通道 3 的参数时，需要借助示波器来观察确认输出的方波信号是否符合预期。</p>
|
||
<div class="- topic/p p" data-ofbid="d179551e143__20250121171624">运行期间也可以动态 <span class="+ topic/keyword pr-d/parmname keyword parmname">set</span> 通道 3 的周期和占空比。例如<ol class="- topic/ol ol" type="a" id="id__ol_t5z_5h1_tdc" data-ofbid="id__ol_t5z_5h1_tdc"><li class="- topic/li li" data-ofbid="d179551e149__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e151__20250121171624">将周期设置为 1,000,000 微秒，占空比设置为 10%：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_fxf_ng1_tdc" data-ofbid="id__codeblock_fxf_ng1_tdc">pwm set <span class="hl-number">3</span> <span class="hl-number">1000000</span> <span class="hl-number">100000</span></pre>
|
||
<div class="- topic/p p" data-ofbid="d179551e157__20250121171624">系统输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_owf_wh1_tdc" data-ofbid="id__codeblock_owf_wh1_tdc">pwm info set on pwm at channel <span class="hl-number">3</span></pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e162__20250121171624">
|
||
<div class="- topic/p p" data-ofbid="d179551e164__20250121171624">再将占空比设置为
|
||
90%：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_jkq_4g1_tdc" data-ofbid="id__codeblock_jkq_4g1_tdc">pwm set <span class="hl-number">3</span> <span class="hl-number">1000000</span> <span class="hl-number">900000</span></pre></div>
|
||
<div class="- topic/p p" data-ofbid="d179551e169__20250121171624">系统输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_tbd_pg1_tdc" data-ofbid="id__codeblock_tbd_pg1_tdc">pwm info set on pwm at channel <span class="hl-number">3</span></pre></div>
|
||
</li></ol></div>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e175__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e177__20250121171624"><span class="+ topic/keyword pr-d/parmname keyword parmname">enable</span> 通道 3</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_brj_mg1_tdc" data-ofbid="id__codeblock_brj_mg1_tdc">pwm enable <span class="hl-number">3</span></pre>
|
||
<div class="- topic/p p" data-ofbid="d179551e185__20250121171624">系统输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_w2y_gg1_tdc" data-ofbid="id__codeblock_w2y_gg1_tdc">pwm channel <span class="hl-number">3</span> is enabled success</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e190__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e192__20250121171624">使用 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">set_pul</span> 参数指定数目脉冲输出。</p>
|
||
<div class="- topic/p p" data-ofbid="d179551e198__20250121171624">例如，设置中断模式为 0，周期为 1,000,000 微秒，脉冲宽度为 500,000 微秒，脉冲数为
|
||
5：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_xtm_b31_tdc" data-ofbid="id__codeblock_xtm_b31_tdc">pwm set_pul <span class="hl-number">3</span> <span class="hl-number">0</span> <span class="hl-number">1000000</span> <span class="hl-number">500000</span> <span class="hl-number">5</span>
|
||
pwm pul set on pwm at channel <span class="hl-number">3</span>
|
||
[I] aic_pwm_irq()<span class="hl-number">198</span>
|
||
isr cnt:<span class="hl-number">5</span>,disabled the pwm3 interrupt now.
|
||
</pre></div>
|
||
<div class="- topic/p p" data-ofbid="d179551e203__20250121171624">重复上述命令，可以再次触发脉冲输出：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_bbd_c31_tdc" data-ofbid="id__codeblock_bbd_c31_tdc">pwm set_pul <span class="hl-number">3</span> <span class="hl-number">0</span> <span class="hl-number">1000000</span> <span class="hl-number">500000</span> <span class="hl-number">5</span>
|
||
pwm pul set on pwm at channel <span class="hl-number">3</span>
|
||
[I] aic_pwm_irq()<span class="hl-number">198</span>
|
||
isr cnt:<span class="hl-number">5</span>,disabled the pwm3 interrupt now.
|
||
</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e208__20250121171624">使用 <code class="+ topic/ph pr-d/codeph ph codeph">pwm_status</code>
|
||
查看通道的动作配置。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_a1v_tg1_tdc" data-ofbid="id__codeblock_a1v_tg1_tdc">pwm_status
|
||
In PWM V1.<span class="hl-number">00</span>:
|
||
Module Enable: <span class="hl-number">1</span>, IRQ Enable: <span class="hl-number">0x8</span>
|
||
Ch En Mode Tb-clk-rate Def CBD CBU CAD CAU PRD ZRO
|
||
<span class="hl-number">00</span> Up <span class="hl-number">240000000</span> - - - - - -
|
||
- - - - - -
|
||
<span class="hl-number">10</span> Up <span class="hl-number">240000000</span> - - - - - -
|
||
- - - - - -
|
||
<span class="hl-number">20</span> Up <span class="hl-number">240000000</span> - - - - - -
|
||
- - - - - -
|
||
<span class="hl-number">31</span> Up <span class="hl-number">240000000</span> - - - Low Hgh -
|
||
- - - Low Hgh -
|
||
</pre><p class="- topic/p p" data-ofbid="d179551e215__20250121171624">通道 3 默认配置为 <span class="+ topic/keyword pr-d/parmname keyword parmname">CAU</span> 动作，所以此处
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">irq_mode</span> 配置为 0。同时由于 <span class="+ topic/keyword pr-d/parmname keyword parmname">CAU</span> 为
|
||
Low，所以输出的脉冲方向为下降沿。</p><p class="- topic/p p" data-ofbid="d179551e226__20250121171624">脉冲输出的方向与 <span class="+ topic/keyword pr-d/parmname keyword parmname">action</span>
|
||
配置有关，同时指定脉冲数目输出依赖中断，中断模式需要与 action 配置相对应。</p><div class="- topic/p p" data-ofbid="d179551e231__20250121171624">其中
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">irq_mode</span> 范围为 0-3，依次为:<ul class="- topic/ul ul simple" id="id__ul_aqr_n33_fdc" data-ofbid="id__ul_aqr_n33_fdc"><li class="- topic/li li" data-ofbid="d179551e237__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e239__20250121171624">0: TBCTR=CMPA 且计数器正在递增时触发事件</p>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e242__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e244__20250121171624">1: TBCTR=CMPA 且计数器正在递减时触发事件</p>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e247__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e249__20250121171624">2: TBCTR=CMPB 且计数器正在递增时触发事件</p>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e252__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e254__20250121171624">3: TBCTR=CMPB 且计数器正在递减时触发事件</p>
|
||
</li></ul></div></li></ol></section><section class="- topic/section section" id="id__id6" data-ofbid="id__id6"><h2 class="- topic/title title sectiontitle">简要编程指南</h2>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_iqb_p33_fdc" data-ofbid="id__codeblock_iqb_p33_fdc"><strong class="hl-keyword">struct</strong> rt_device_pwm *pwm_dev = RT_NULL;
|
||
pwm_dev = (<strong class="hl-keyword">struct</strong> rt_device_pwm *)rt_device_find(<span class="hl-string">"pwm"</span>);
|
||
<strong class="hl-keyword">if</strong> (pwm_dev == NULL) {
|
||
rt_kprintf(<span class="hl-string">"can't find pwm device!\n"</span>);
|
||
<strong class="hl-keyword">return</strong> -RT_ERROR;
|
||
}
|
||
|
||
rt_pwm_set(pwm_dev, <span class="hl-number">3</span>, <span class="hl-number">10000</span>, <span class="hl-number">5000</span>);
|
||
rt_pwm_enable(pwm_dev, <span class="hl-number">3</span>);
|
||
|
||
rt_pwm_set_output(pwm_dev, <span class="hl-number">2</span>, <span class="hl-number">10000</span>, <span class="hl-number">5000</span>, <span class="hl-number">0</span>);
|
||
rt_pwm_set_output(pwm_dev, <span class="hl-number">2</span>, <span class="hl-number">10000</span>, <span class="hl-number">2000</span>, <span class="hl-number">1</span>);
|
||
rt_pwm_enable(pwm_dev, <span class="hl-number">2</span>);</pre><div class="- topic/note note tip note_tip" id="id__note_jzl_qn3_ddc" data-ofbid="id__note_jzl_qn3_ddc"><span class="note__title">提示：</span>
|
||
<ol class="- topic/ol ol arabic simple" data-ofbid="d179551e265__20250121171624"><li class="- topic/li li" data-ofbid="d179551e266__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e268__20250121171624">RT-Thread PWM 子系统中的 <span class="+ topic/keyword pr-d/apiname keyword apiname">open/read/write/control</span>
|
||
接口设计不太友好，建议按照使用上述接口。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d179551e274__20250121171624">
|
||
<p class="- topic/p p" data-ofbid="d179551e276__20250121171624">使用 <span class="+ topic/keyword pr-d/apiname keyword apiname">rt_pwm_set_output</span> 可实现同一 PWM 通道，同一周期下的两种不同占空比输出。</p>
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