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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"><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_debug.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</h1><div class="date inPage">18 Dec 2024</div><div style="color: gray;">
Read time: 9 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="pwm_debug_guide__section_tnj_ljs_21c" data-ofbid="pwm_debug_guide__section_tnj_ljs_21c"><h2 class="- topic/title title sectiontitle">调试开关</h2>
<div class="- topic/p p" data-ofbid="d309715e27__20250121171815">
<ol class="- topic/ol ol" id="pwm_debug_guide__ul_qhh_btr_sdc" data-ofbid="pwm_debug_guide__ul_qhh_btr_sdc"><li class="- topic/li li" data-ofbid="d309715e30__20250121171815">
<div class="- topic/div div">
<div class="- topic/p p" data-ofbid="d309715e34__20250121171815">在 SDK 根目录下，执行下列命令，进入 kernel
的功能配置界面：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_wg1_3ml_sdc" data-ofbid="pwm_debug_guide__codeblock_wg1_3ml_sdc">make kernel-menuconfig</pre></div>
<p class="- topic/p p" data-ofbid="d309715e39__20250121171815">或使用简写命令</p>
<div class="- topic/p p" data-ofbid="d309715e42__20250121171815">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_uss_hml_sdc" data-ofbid="pwm_debug_guide__codeblock_uss_hml_sdc">make km</pre>
</div>
</div>
</li><li class="- topic/li li" data-ofbid="d309715e49__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e51__20250121171815">在内核配置界面，打开 PWM 模块的 DEBUG 选项：</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__pre_unj_ljs_21c" data-ofbid="pwm_debug_guide__pre_unj_ljs_21c">Linux
Kernel hacking
Artinchip Debug
[*] PWM driver debug</pre>
<div class="- topic/p p" data-ofbid="d309715e57__20250121171815">打开 DEBUG 选项后：<ul class="- topic/ul ul" id="pwm_debug_guide__ol_ucp_mss_c1c" data-ofbid="pwm_debug_guide__ol_ucp_mss_c1c"><li class="- topic/li li" data-ofbid="d309715e60__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e62__20250121171815">驱动以<code class="+ topic/ph pr-d/codeph ph codeph">-O0</code> 编译。</p>
</li><li class="- topic/li li" data-ofbid="d309715e68__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e70__20250121171815"><span class="+ topic/keyword pr-d/parmname keyword parmname">pr_dbg()</span> 和 <span class="+ topic/keyword pr-d/parmname keyword parmname">dev_dbg()</span> 调试信息会被编译。</p>
<div class="- topic/p p" id="pwm_debug_guide__p_wvf_n3w_mdc" data-ofbid="pwm_debug_guide__p_wvf_n3w_mdc">在系统运行时，如果要打印 <span class="+ topic/keyword pr-d/parmname keyword parmname">pr_dbg()</span> 和
<span class="+ topic/keyword pr-d/parmname keyword parmname">dev_dbg()</span> 信息，还需要调整 <span class="+ topic/keyword pr-d/parmname keyword parmname">loglevel</span> 为
8，可以通过以下两种方式实现：<ul class="- topic/ul ul" id="pwm_debug_guide__ol_vcp_mss_c1c" data-ofbid="pwm_debug_guide__ol_vcp_mss_c1c"><li class="- topic/li li" data-ofbid="d309715e90__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e92__20250121171815">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中修改
<span class="+ topic/keyword pr-d/parmname keyword parmname">bootargs</span>，增加
<span class="+ topic/keyword pr-d/parmname keyword parmname">“loglevel=8”</span></p>
</li><li class="- topic/li li" data-ofbid="d309715e103__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e105__20250121171815">在板子启动到 Linux Shell
后，执行下列命令：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__pre_wcp_mss_c1c" data-ofbid="pwm_debug_guide__pre_wcp_mss_c1c">echo8 &gt; /proc/sys/kernel/printk</pre></div>
</li></ul></div>
</li></ul></div>
</li></ol>
</div>
</section><section class="- topic/section section" id="pwm_debug_guide__section_ynj_ljs_21c" data-ofbid="pwm_debug_guide__section_ynj_ljs_21c"><h2 class="- topic/title title sectiontitle">查看 Sysfs 中的状态信息</h2>
<div class="- topic/p p" data-ofbid="d309715e119__20250121171815">在 PWM/EPWM 驱动初始化成功后，会在 Sysfs 中注册生成一个 <code class="+ topic/ph pr-d/codeph ph codeph">status</code> 状态节点，其中打印了当前的 PWM/ EPWM
配置及状态信息：<ul class="- topic/ul ul" id="pwm_debug_guide__ul_l4s_dtr_sdc" data-ofbid="pwm_debug_guide__ul_l4s_dtr_sdc"><li class="- topic/li li" data-ofbid="d309715e125__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e127__20250121171815">查看 PWM
状态节点：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_zmc_xjs_21c" data-ofbid="pwm_debug_guide__codeblock_zmc_xjs_21c">cat /sys/devices/platform/soc/<span class="hl-number">19240000.</span>pwm/status</pre></div>
<div class="- topic/p p" data-ofbid="d309715e132__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_k1k_dtr_sdc" data-ofbid="pwm_debug_guide__codeblock_k1k_dtr_sdc">In PWM V1.<span class="hl-number">00</span>:
Module Enable: <span class="hl-number">1</span>, IRQ Enable: <span class="hl-number">0x0</span>
Ch En Mode Tb-clk-rate Def CBD CBU CAD CAU PRD ZRO
<span class="hl-number">0</span> <span class="hl-number">0</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -
<span class="hl-number">1</span> <span class="hl-number">0</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -
<span class="hl-number">2</span> <span class="hl-number">1</span> Up <span class="hl-number">24000000</span> <span class="hl-number">0</span> - - - Hgh Low -
- - - Low Hgh -
<span class="hl-number">3</span> <span class="hl-number">0</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -</pre></div>
</li><li class="- topic/li li" data-ofbid="d309715e137__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e139__20250121171815">查看 EPWM
状态节点：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_wgx_xjs_21c" data-ofbid="pwm_debug_guide__codeblock_wgx_xjs_21c">cat /sys/devices/platform/soc/<span class="hl-number">18200000.e</span>pwm/status</pre></div>
<div class="- topic/p p" data-ofbid="d309715e144__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_zgb_ftr_sdc" data-ofbid="pwm_debug_guide__codeblock_zgb_ftr_sdc">Ch Mode Tb-clk-rate Def CBD CBU CAD CAU PRD ZRO
<span class="hl-number">0</span> Up <span class="hl-number">24000000</span> <span class="hl-number">1</span> - - - Hgh - Low
- Hgh - - - Low
<span class="hl-number">1</span> Up <span class="hl-number">24000000</span> <span class="hl-number">1</span> - - - Hgh - Low
- Hgh - - - Low
<span class="hl-number">2</span> Up <span class="hl-number">24000000</span> <span class="hl-number">1</span> - - - Hgh - Low
- Hgh - - - Low
<span class="hl-number">3</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -
<span class="hl-number">4</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -
<span class="hl-number">5</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -</pre></div>
</li></ul></div>
</section><section class="- topic/section section" id="pwm_debug_guide__section_zvv_b5r_sdc" data-ofbid="pwm_debug_guide__section_zvv_b5r_sdc"><h2 class="- topic/title title sectiontitle">查看 Sysfs 中的背光设置</h2>
<div class="- topic/p p" data-ofbid="d309715e155__20250121171815">Linux 背光子系统提供了用来获取和设置当前背光的 Sysfs 节点。例如，执行下列命令可以查看和修改 Linux 系统中背光的当前亮度和最大亮度：<ol class="- topic/ol ol" id="pwm_debug_guide__ol_rb5_w5r_sdc" data-ofbid="pwm_debug_guide__ol_rb5_w5r_sdc"><li class="- topic/li li" data-ofbid="d309715e158__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e160__20250121171815">查看背光配置：<ul class="- topic/ul ul" id="pwm_debug_guide__ol_tgx_4tr_sdc" data-ofbid="pwm_debug_guide__ol_tgx_4tr_sdc"><li class="- topic/li li" data-ofbid="d309715e163__20250121171815">进入背光配置目录：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_xsq_4js_21c" data-ofbid="pwm_debug_guide__codeblock_xsq_4js_21c">cd /sys/class/backlight/backlight/</pre></li><li class="- topic/li li" data-ofbid="d309715e167__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e169__20250121171815">列出当前所有背光配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_qgs_ptr_sdc" data-ofbid="pwm_debug_guide__codeblock_qgs_ptr_sdc">ls /sys/class/backlight/backlight/</pre></div>
<div class="- topic/p p" data-ofbid="d309715e174__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_c2g_qtr_sdc" data-ofbid="pwm_debug_guide__codeblock_c2g_qtr_sdc">actual_brightness device/ subsystem/
bl_power max_brightness type
brightness scale uevent</pre></div>
</li><li class="- topic/li li" data-ofbid="d309715e179__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e181__20250121171815">查看最大亮度<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_l1w_qtr_sdc" data-ofbid="pwm_debug_guide__codeblock_l1w_qtr_sdc">cat max_brightness</pre></div>
<div class="- topic/p p" data-ofbid="d309715e186__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_azg_rtr_sdc" data-ofbid="pwm_debug_guide__codeblock_azg_rtr_sdc"><span class="hl-number">10</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d309715e191__20250121171815">查看当前亮度<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_dcd_rtr_sdc" data-ofbid="pwm_debug_guide__codeblock_dcd_rtr_sdc">cat brightness</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_shl_vtr_sdc" data-ofbid="pwm_debug_guide__codeblock_shl_vtr_sdc"><span class="hl-number">8</span></pre></li></ul></div>
</li><li class="- topic/li li" id="pwm_debug_guide__li_ms1_2h1_tdc" data-ofbid="pwm_debug_guide__li_ms1_2h1_tdc">
<div class="- topic/p p" data-ofbid="d309715e200__20250121171815">修改背光配置：<ul class="- topic/ul ul" id="pwm_debug_guide__ul_xs1_2h1_tdc" data-ofbid="pwm_debug_guide__ul_xs1_2h1_tdc"><li class="- topic/li li" data-ofbid="d309715e203__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e205__20250121171815">将亮度设置为
9：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_c2r_vtr_sdc" data-ofbid="pwm_debug_guide__codeblock_c2r_vtr_sdc">echo <span class="hl-number">9</span> &gt; brightness</pre></div>
<div class="- topic/p p" data-ofbid="d309715e210__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_hls_v5r_sdc" data-ofbid="pwm_debug_guide__codeblock_hls_v5r_sdc">[ <span class="hl-number">146.913635</span>] backlight: set brightness to <span class="hl-number">9</span>
[ <span class="hl-number">154.054433</span>] aic-pwm <span class="hl-number">19240000.</span>pwm: ch0 duty <span class="hl-number">900000</span> period <span class="hl-number">1000000</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d309715e215__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e217__20250121171815">将亮度设置为 10：</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_ntn_wtr_sdc" data-ofbid="pwm_debug_guide__codeblock_ntn_wtr_sdc">echo <span class="hl-number">10</span> &gt; brightness</pre>
<div class="- topic/p p" data-ofbid="d309715e223__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_hnb_1vr_sdc" data-ofbid="pwm_debug_guide__codeblock_hnb_1vr_sdc">[ <span class="hl-number">192.145595</span>] backlight: set brightness to <span class="hl-number">10</span>
[ <span class="hl-number">192.151118</span>] aic-pwm <span class="hl-number">19240000.</span>pwm: ch0 duty <span class="hl-number">1000000</span> period <span class="hl-number">1000000</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d309715e228__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e230__20250121171815">将亮度重新设置为
9<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_uqx_wtr_sdc" data-ofbid="pwm_debug_guide__codeblock_uqx_wtr_sdc">echo <span class="hl-number">9</span> &gt; brightness</pre></div>
<div class="- topic/p p" data-ofbid="d309715e235__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_yqq_bvr_sdc" data-ofbid="pwm_debug_guide__codeblock_yqq_bvr_sdc">
[ <span class="hl-number">194.681923</span>] backlight: set brightness to <span class="hl-number">9</span>
[ <span class="hl-number">194.687264</span>] aic-pwm <span class="hl-number">19240000.</span>pwm: ch0 duty <span class="hl-number">900000</span> period <span class="hl-number">1000000</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d309715e240__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e242__20250121171815">将亮度设置为
8<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_zxk_xtr_sdc" data-ofbid="pwm_debug_guide__codeblock_zxk_xtr_sdc">echo <span class="hl-number">8</span> &gt; brightness</pre></div>
<div class="- topic/p p" data-ofbid="d309715e247__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_d1z_cvr_sdc" data-ofbid="pwm_debug_guide__codeblock_d1z_cvr_sdc">[ <span class="hl-number">197.748816</span>] backlight: set brightness to <span class="hl-number">8</span>
[ <span class="hl-number">197.753606</span>] aic-pwm <span class="hl-number">19240000.</span>pwm: ch0 duty <span class="hl-number">800000</span> period <span class="hl-number">1000000</span></pre></div>
</li><li class="- topic/li li" data-ofbid="d309715e252__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e254__20250121171815">将亮度设置为 7</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_n3v_xtr_sdc" data-ofbid="pwm_debug_guide__codeblock_n3v_xtr_sdc">echo <span class="hl-number">7</span> &gt; brightness</pre>
</li></ul></div>
</li></ol></div>
</section><section class="- topic/section section" id="pwm_debug_guide__section_czn_c5r_sdc" data-ofbid="pwm_debug_guide__section_czn_c5r_sdc"><h2 class="- topic/title title sectiontitle">动态配置 PWM 通道</h2>
<p class="- topic/p p" data-ofbid="d309715e267__20250121171815">为了提供调试的效率，PWM/ EPWM 驱动都包含一个 <span class="+ topic/ph sw-d/filepath ph filepath">config</span> 节点，可在系统运行时动态修改任意 PWM 或 EPWM
通道的任意参数 ，且修改可立即生效。动态配置 PWM 通道，允许开发者在不重新编译固件或重启设备的情况下调整 PWM 参数。</p>
<div class="- topic/p p" data-ofbid="d309715e273__20250121171815">假设需要动态配置一个 PWM 通道，设备路径为
<span class="+ topic/ph sw-d/filepath ph filepath">/sys/devices/platform/soc/1924000.pwm/config</span>，以及一个 EPWM
通道，设备路径为 <span class="+ topic/ph sw-d/filepath ph filepath">/sys/devices/platform/soc/18200000.epwm/config</span>：<div class="- topic/note note note note_note" id="pwm_debug_guide__note_mft_fwr_sdc" data-ofbid="pwm_debug_guide__note_mft_fwr_sdc"><span class="note__title">注：</span> 关于<span class="+ topic/ph sw-d/filepath ph filepath">config</span> 节点参数，详情可查看 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="pwm_debug.html#pwm_debug_guide__section_xhp_3wr_sdc">config 节点参数描述</a>。</div></div>
<div class="- topic/p p" data-ofbid="d309715e291__20250121171815">
<ol class="- topic/ol ol" id="pwm_debug_guide__ol_e4j_ljs_21c" data-ofbid="pwm_debug_guide__ol_e4j_ljs_21c"><li class="- topic/li li" data-ofbid="d309715e294__20250121171815">使用一步 Shell 中的 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">echo</span> 操作，修改 <span class="+ topic/ph sw-d/filepath ph filepath">dts</span>
中的通道参数。<ul class="- topic/ul ul" id="pwm_debug_guide__ul_gl2_vwr_sdc" data-ofbid="pwm_debug_guide__ul_gl2_vwr_sdc"><li class="- topic/li li" data-ofbid="d309715e303__20250121171815">PWM：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_utb_bks_21c" data-ofbid="pwm_debug_guide__codeblock_utb_bks_21c">echo <span class="hl-string">"0 1 0 24000000 1 0 2 0 0 1 0"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">1924000.</span>pwm/config</pre></li><li class="- topic/li li" data-ofbid="d309715e307__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e309__20250121171815">EPWM<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_iqv_wwr_sdc" data-ofbid="pwm_debug_guide__codeblock_iqv_wwr_sdc">echo <span class="hl-string">"0 0 0 24000000 0 0 0 0 1 0 2"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">18200000.e</span>pwm/config</pre></div>
</li></ul></li><li class="- topic/li li" data-ofbid="d309715e314__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e316__20250121171815">修改完配置后，查看 <code class="+ topic/ph pr-d/codeph ph codeph">status</code> 文件确认配置是否生效：</p>
<ul class="- topic/ul ul" id="pwm_debug_guide__ul_vpv_ywr_sdc" data-ofbid="pwm_debug_guide__ul_vpv_ywr_sdc"><li class="- topic/li li" data-ofbid="d309715e323__20250121171815">PWM<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_tyz_dwr_sdc" data-ofbid="pwm_debug_guide__codeblock_tyz_dwr_sdc">cat /sys/devices/platform/soc/<span class="hl-number">19240000.</span>pwm/status</pre><div class="- topic/p p" data-ofbid="d309715e327__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_x3x_swr_sdc" data-ofbid="pwm_debug_guide__codeblock_x3x_swr_sdc">In PWM V1.<span class="hl-number">00</span>:
Module Enable: <span class="hl-number">1</span>, IRQ Enable: <span class="hl-number">0x0</span>
Ch En Mode Tb-clk-rate Def CBD CBU CAD CAU PRD ZRO
<span class="hl-number">0</span> <span class="hl-number">1</span> Up <span class="hl-number">24000000</span> <span class="hl-number">1</span> - - - Hgh Low -
- Hgh - - Low -
<span class="hl-number">1</span> <span class="hl-number">0</span> Up <span class="hl-number">24000000</span> <span class="hl-number">1</span> - - - Hgh Low Low
- - - - - -
<span class="hl-number">2</span> <span class="hl-number">0</span> Up <span class="hl-number">24000000</span> <span class="hl-number">0</span> - - - - - -
- - - - - -
<span class="hl-number">3</span> <span class="hl-number">0</span> Up <span class="hl-number">24000000</span> <span class="hl-number">0</span> - - - - - -
- - - - - -</pre></div></li><li class="- topic/li li" data-ofbid="d309715e331__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e333__20250121171815">EPWM</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_bs2_bks_21c" data-ofbid="pwm_debug_guide__codeblock_bs2_bks_21c">cat /sys/devices/platform/soc/<span class="hl-number">18200000.e</span>pwm/status</pre>
<div class="- topic/p p" data-ofbid="d309715e339__20250121171815">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_zjy_zwr_sdc" data-ofbid="pwm_debug_guide__codeblock_zjy_zwr_sdc">Ch Mode Tb-clk-rate Def CBD CBU CAD CAU PRD ZRO
<span class="hl-number">0</span> Up <span class="hl-number">24000000</span> <span class="hl-number">0</span> - - - Low - Hgh
- Hgh - - - Low
<span class="hl-number">1</span> Up <span class="hl-number">24000000</span> <span class="hl-number">1</span> - - - Hgh - Low
- Hgh - - - Low
<span class="hl-number">2</span> Up <span class="hl-number">24000000</span> <span class="hl-number">1</span> - - - Hgh - Low
- Hgh - - - Low
<span class="hl-number">3</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -
<span class="hl-number">4</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -
<span class="hl-number">5</span> Up <span class="hl-number">0</span> <span class="hl-number">0</span> - - - - - -
- - - - - -</pre></div>
</li></ul>
</li><li class="- topic/li li" data-ofbid="d309715e345__20250121171815">编译 U-Boot 和镜像文件。</li><li class="- topic/li li" data-ofbid="d309715e347__20250121171815">重启板子后下载最新镜像。</li><li class="- topic/li li" data-ofbid="d309715e349__20250121171815">使用示波器查看该 PWM 通道的信号输出是否符合预期。 </li><li class="- topic/li li" data-ofbid="d309715e351__20250121171815">配置 PWM 输出占空比。<div class="- topic/p p" data-ofbid="d309715e353__20250121171815">同一 PWW 中的两个 action 输出不同占空比。配置不同占空比需要依赖两个 action
在不同时间发生变化：<ol class="- topic/ol ol" type="a" id="pwm_debug_guide__ol_zzr_kxr_sdc" data-ofbid="pwm_debug_guide__ol_zzr_kxr_sdc"><li class="- topic/li li" data-ofbid="d309715e356__20250121171815">在 <code class="+ topic/ph pr-d/codeph ph codeph">config</code> 节点中，配置 PWMx,action0 在 CAU、ZRO
动作，action1 在 CBU、ZRO 动作。</li><li class="- topic/li li" data-ofbid="d309715e361__20250121171815"><p class="- topic/p p" data-ofbid="d309715e362__20250121171815">分别控制 <code class="+ topic/ph pr-d/codeph ph codeph">output0</code> 和
<code class="+ topic/ph pr-d/codeph ph codeph">output1</code>。</p><code class="+ topic/ph pr-d/codeph ph codeph">output0</code> 修改的是
CMPA 寄存器，此处对应 action0，<code class="+ topic/ph pr-d/codeph ph codeph">output1</code> 修改的是 CMPB
寄存器，此处对应 action1<ul class="- topic/ul ul" id="pwm_debug_guide__ul_i53_nxr_sdc" data-ofbid="pwm_debug_guide__ul_i53_nxr_sdc"><li class="- topic/li li" data-ofbid="d309715e377__20250121171815">配置 PWM 输出占空比，例如配置通道 3
的输出占空比：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_tqp_cks_21c" data-ofbid="pwm_debug_guide__codeblock_tqp_cks_21c">echo <span class="hl-string">"3 1000000 800000"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">1924000.</span>pwm/output0</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_as5_sxr_sdc" data-ofbid="pwm_debug_guide__codeblock_as5_sxr_sdc">echo <span class="hl-string">"3 1000000 200000"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">1924000.</span>pwm/output1</pre></li><li class="- topic/li li" data-ofbid="d309715e383__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e385__20250121171815">配置 EPWM 输出占空比，例如配置通道 0
的输出占空比：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_p3s_cks_21c" data-ofbid="pwm_debug_guide__codeblock_p3s_cks_21c">echo <span class="hl-string">"0 1000000 800000"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">18200000.e</span>pwm/output0</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_sjk_vxr_sdc" data-ofbid="pwm_debug_guide__codeblock_sjk_vxr_sdc">echo <span class="hl-string">"0 1000000 200000"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">18200000.e</span>pwm/output1</pre></div>
</li></ul></li></ol></div></li><li class="- topic/li li" data-ofbid="d309715e393__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e395__20250121171815">如果需要指定数目的脉冲输出，可以使用以下命令：</p>
<div class="- topic/p p" data-ofbid="d309715e398__20250121171815">以下示例表示配置输出 8 个脉冲：<ul class="- topic/ul ul" id="pwm_debug_guide__ul_i3y_wxr_sdc" data-ofbid="pwm_debug_guide__ul_i3y_wxr_sdc"><li class="- topic/li li" data-ofbid="d309715e401__20250121171815">PWM<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_khx_cks_21c" data-ofbid="pwm_debug_guide__codeblock_khx_cks_21c">echo <span class="hl-string">"3 0 1000000 800000 8"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">1924000.</span>pwm/pulse</pre></li><li class="- topic/li li" data-ofbid="d309715e405__20250121171815">EPWM<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_zwz_cks_21c" data-ofbid="pwm_debug_guide__codeblock_zwz_cks_21c">echo <span class="hl-string">"0 0 1000000 500000 8"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">18200000.e</span>pwm/pulse</pre></li></ul></div>
<div class="- topic/note note note note_note" id="pwm_debug_guide__note_skq_vzr_sdc" data-ofbid="pwm_debug_guide__note_skq_vzr_sdc"><span class="note__title">注：</span> 脉冲输出方向与 <code class="+ topic/ph pr-d/codeph ph codeph">action</code>
配置有关，并且指定脉冲数目输出依赖中断，中断模式需要与 <code class="+ topic/ph pr-d/codeph ph codeph">action</code> 配置相对应，详情可查看<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="pwm_debug.html#pwm_debug_guide__section_b2t_hyr_sdc">脉冲输出方向与 Action 配置</a>和<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="pwm_debug.html#pwm_debug_guide__section_cyc_kzr_sdc">指定脉冲数目输出依赖中断</a></div>
</li></ol>
</div>
</section><section class="- topic/section section" id="pwm_debug_guide__section_xhp_3wr_sdc" data-ofbid="pwm_debug_guide__section_xhp_3wr_sdc"><h2 class="- topic/title title sectiontitle"><span class="+ topic/ph sw-d/filepath ph filepath">config</span> 节点参数描述</h2>
<div class="- topic/p p" data-ofbid="d309715e436__20250121171815"><code class="+ topic/ph pr-d/codeph ph codeph">config</code> 的参数格式定义如下（按从左到右的输入顺序）：<div class="table-container"><table class="- topic/table table frame-all" id="pwm_debug_guide__table_h4j_ljs_21c" data-ofbid="pwm_debug_guide__table_h4j_ljs_21c" data-cols="3"><caption></caption><colgroup><col style="width:22.47191011235955%"/><col style="width:23.370786516853933%"/><col style="width:54.157303370786515%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_debug_guide__table_h4j_ljs_21c__entry__1">参数名称</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_debug_guide__table_h4j_ljs_21c__entry__2">取值范围</th><th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_debug_guide__table_h4j_ljs_21c__entry__3">含义</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">channel No.</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__2">[0, 3]</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__3">通道号</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">action No.</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__2">[0, 1]</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__3">0 和 1 分别代表 action0、action1</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">mode</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__2">[0, 2]</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__3">0, up-count; 1, down-count; 2, up-down-count</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">tb-clk-rate</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__2">[0, 24000000]</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__3">时基计数器的工作时钟</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">default level</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__2">[0, 1]</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__3">初始电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">CBD</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__2" rowspan="6">[0, 3]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__3" rowspan="6">
<p class="- topic/p p" data-ofbid="d309715e496__20250121171815">0, none;</p>
<p class="- topic/p p" data-ofbid="d309715e499__20250121171815">1, low;</p>
<p class="- topic/p p" data-ofbid="d309715e502__20250121171815">2, high;</p>
<p class="- topic/p p" data-ofbid="d309715e505__20250121171815">3, inverse</p>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">CBU</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">CAD</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">CAU</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">PRD</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_debug_guide__table_h4j_ljs_21c__entry__1">ZRO</td></tr></tbody></table></div></div>
</section><section class="- topic/section section" id="pwm_debug_guide__section_b2t_hyr_sdc" data-ofbid="pwm_debug_guide__section_b2t_hyr_sdc"><h2 class="- topic/title title sectiontitle">脉冲输出方向与 Action 配置</h2>
<p class="- topic/p p" data-ofbid="d309715e529__20250121171815">在 PWM 和 EPWM 中，脉冲输出的方向和行为可以通过配置不同的 <code class="+ topic/ph pr-d/codeph ph codeph">action</code> 来实现。每个
<code class="+ topic/ph pr-d/codeph ph codeph">action</code> 可以独立配置其触发条件、输出电平以及是否产生中断等。</p>
<div class="- topic/p p" data-ofbid="d309715e538__20250121171815">假设需要动态配置一个 PWM 通道，设备路径为
<span class="+ topic/ph sw-d/filepath ph filepath">/sys/devices/platform/soc/1924000.pwm/config</span>，执行下列命令，可配置两个
<code class="+ topic/ph pr-d/codeph ph codeph">action</code>，分别用于控制脉冲输出的方向和行为：<ul class="- topic/ul ul" id="pwm_debug_guide__ul_t4n_qyr_sdc" data-ofbid="pwm_debug_guide__ul_t4n_qyr_sdc"><li class="- topic/li li" data-ofbid="d309715e547__20250121171815">配置 action
0<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_km1_qyr_sdc" data-ofbid="pwm_debug_guide__codeblock_km1_qyr_sdc">echo <span class="hl-string">"0 1 0 24000000 1 0 2 0 0 1 0"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">1924000.</span>pwm/config
</pre></li><li class="- topic/li li" data-ofbid="d309715e551__20250121171815">配置 action
1<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_dw3_qyr_sdc" data-ofbid="pwm_debug_guide__codeblock_dw3_qyr_sdc">echo <span class="hl-string">"1 1 0 24040000 1 0 2 0 0 1 0"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">1924000.</span>pwm/config
</pre></li></ul></div>
</section><section class="- topic/section section" id="pwm_debug_guide__section_cyc_kzr_sdc" data-ofbid="pwm_debug_guide__section_cyc_kzr_sdc"><h2 class="- topic/title title sectiontitle">指定脉冲数目输出依赖中断</h2>
<p class="- topic/p p" data-ofbid="d309715e561__20250121171815">指定脉冲数目输出通常需要配置中断，以便在达到指定的脉冲数时触发中断处理程序。中断模式需要与 <code class="+ topic/ph pr-d/codeph ph codeph">action</code>
配置相对应，以确保正确的事件触发。</p>
<div class="- topic/p p" data-ofbid="d309715e567__20250121171815">以下示例中，配置了一个中断，当计数器达到某个值时触发中断。需要确保中断模式与 <code class="+ topic/ph pr-d/codeph ph codeph">action</code>
配置相匹配。例如：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_debug_guide__codeblock_chj_mzr_sdc" data-ofbid="pwm_debug_guide__codeblock_chj_mzr_sdc">echo <span class="hl-string">"3 1000000 800000 8"</span> &gt; /sys/devices/platform/soc/<span class="hl-number">1924000.</span>pwm/pulse
</pre><ul class="- topic/ul ul" id="pwm_debug_guide__ul_rq4_qzr_sdc" data-ofbid="pwm_debug_guide__ul_rq4_qzr_sdc"><li class="- topic/li li" data-ofbid="d309715e575__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e577__20250121171815"><code class="+ topic/ph pr-d/codeph ph codeph">mode</code> 设置为 <code class="+ topic/ph pr-d/codeph ph codeph">3</code>，表示 TBCTR=CMPB
且计数器正在递减时触发事件。确保与 <code class="+ topic/ph pr-d/codeph ph codeph">action</code> 的配置相匹配。</p>
</li><li class="- topic/li li" data-ofbid="d309715e588__20250121171815">
<div class="- topic/p p" data-ofbid="d309715e590__20250121171815"><code class="+ topic/ph pr-d/codeph ph codeph">mode</code> 取值范围如下：<ul class="- topic/ul ul" id="pwm_debug_guide__ul_o4j_ljs_21c" data-ofbid="pwm_debug_guide__ul_o4j_ljs_21c"><li class="- topic/li li" data-ofbid="d309715e595__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e597__20250121171815">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="d309715e600__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e602__20250121171815">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="d309715e605__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e607__20250121171815">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="d309715e610__20250121171815">
<p class="- topic/p p" data-ofbid="d309715e612__20250121171815">3: TBCTR=CMPB 且计数器正在递减时触发事件</p>
</li></ul></div>
</li></ul></div>
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