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< div class = "date inPage" > 16 May 2025< / div > < div style = "color: gray;" >
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Read time: 4 minute(s)
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< section class = "- topic/section section" id = "id__id2" data-ofbid = "id__id2" > < h2 class = "- topic/title title sectiontitle" > 测试环境< / h2 >
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< strong class = "+ topic/ph hi-d/b ph b" > 硬件< / strong >
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< ul class = "- topic/ul ul simple" id = "id__ul_wcz_n31_tdc" data-ofbid = "id__ul_wcz_n31_tdc" >
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< li class = "- topic/li li" data-ofbid = "d204158e44__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e46__20250519091528" > 开发板< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e50__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e52__20250519091528" > 示波器，用于观察输出 PWM 信号的波形< / p >
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< / li >
< / ul > < / div >
< / li >
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< strong class = "+ topic/ph hi-d/b ph b" > 软件< / strong >
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< li class = "- topic/li li" data-ofbid = "d204158e67__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e69__20250519091528" > PC 端的串口终端软件，用于 PC 和开发板进行串口通信< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e73__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e75__20250519091528" > RT-Thread 系统自带的 < code class = "+ topic/ph pr-d/codeph ph codeph" > pwm< / code > 命令行工具< / p >
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< / li >
< / ul > < / div >
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< div class = "- topic/div div section" id = "id__id5" >
< strong class = "+ topic/ph hi-d/b ph b" > 软件配置< / strong >
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< p class = "- topic/p p" data-ofbid = "d204158e91__20250519091528" > 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 >
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< / 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 >
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< p class = "- topic/p p" data-ofbid = "d204158e103__20250519091528" > 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 = "d204158e108__20250519091528" >
< li class = "- topic/li li" data-ofbid = "d204158e110__20250519091528" > 列示所有 < span class = "+ topic/keyword sw-d/cmdname keyword cmdname" > pwm< / span >
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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
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< / pre > < / li >
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< li class = "- topic/li li" data-ofbid = "d204158e120__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e122__20250519091528" > 使用 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > probe< / span > 参数，选择一个 PWM 设备（ ） < / p >
< div class = "- topic/p p" data-ofbid = "d204158e128__20250519091528" > < 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
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< 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 >
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< div class = "- topic/p p" data-ofbid = "d204158e138__20250519091528" > 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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e144__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e146__20250519091528" > 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 = "d204158e152__20250519091528" > 例如，将周期设置为 1,000,000 微秒，占空比设置为
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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 >
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< div class = "- topic/p p" data-ofbid = "d204158e157__20250519091528" > 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 = "d204158e162__20250519091528" > 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 = "d204158e165__20250519091528" > 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 = "d204158e172__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e174__20250519091528" > 将周期设置为 1,000,000 微秒，占空比设置为 10%： < / p >
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< 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 >
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< div class = "- topic/p p" data-ofbid = "d204158e180__20250519091528" > 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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e186__20250519091528" >
< div class = "- topic/p p" data-ofbid = "d204158e188__20250519091528" > 再将占空比设置为
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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 >
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< div class = "- topic/p p" data-ofbid = "d204158e193__20250519091528" > 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 >
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< / li >
< / ol > < / div >
< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e201__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e203__20250519091528" > < span class = "+ topic/keyword pr-d/parmname keyword parmname" > enable< / span > 通道 3< / p >
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< 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 >
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< div class = "- topic/p p" data-ofbid = "d204158e211__20250519091528" > 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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e217__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e219__20250519091528" > 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 = "d204158e225__20250519091528" > 例如，设置中断模式为 0，
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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 >
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< div class = "- topic/p p" data-ofbid = "d204158e230__20250519091528" > 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 >
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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 >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e237__20250519091528" > 使用 < code class = "+ topic/ph pr-d/codeph ph codeph" > pwm_status< / code >
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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 -
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< / pre > < p class = "- topic/p p" data-ofbid = "d204158e244__20250519091528" > 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
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< 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
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Low， < / p > < p class = "- topic/p p" data-ofbid = "d204158e255__20250519091528" > 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 = "d204158e260__20250519091528" > 其中
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< span class = "+ topic/keyword pr-d/parmname keyword parmname" > irq_mode< / span > 范围为 0-3， < ul class = "- topic/ul ul simple" id = "id__ul_aqr_n33_fdc" data-ofbid = "id__ul_aqr_n33_fdc" >
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< li class = "- topic/li li" data-ofbid = "d204158e267__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e269__20250519091528" > 0: TBCTR=CMPA 且计数器正在递增时触发事件< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e273__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e275__20250519091528" > 1: TBCTR=CMPA 且计数器正在递减时触发事件< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e279__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e281__20250519091528" > 2: TBCTR=CMPB 且计数器正在递增时触发事件< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e285__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e287__20250519091528" > 3: TBCTR=CMPB 且计数器正在递减时触发事件< / p >
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< / 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 >
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< 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 >
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< ol class = "- topic/ol ol arabic simple" data-ofbid = "d204158e301__20250519091528" >
< li class = "- topic/li li" data-ofbid = "d204158e303__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e305__20250519091528" > RT-Thread PWM 子系统中的 < span class = "+ topic/keyword pr-d/apiname keyword apiname" > open/read/write/control< / span >
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接口设计不太友好，建议按照使用上述接口。< / p >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d204158e312__20250519091528" >
< p class = "- topic/p p" data-ofbid = "d204158e314__20250519091528" > 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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< / li >
< / ol >
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< / div >
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< / section >
< / div >
< / article > < / main > < / div >
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< / div >
< nav role = "navigation" id = "wh_topic_toc" aria-label = "On this page" class = "col-lg-2 d-none d-lg-block navbar d-print-none" >
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< div class = " wh_topic_toc " > < div class = "wh_topic_label" > 在本页上< / div > < ul > < li class = "section-item" > < div class = "section-title" > < a href = "#id__id2" data-tocid = "id__id2" > 测试环境< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__pwm" data-tocid = "id__pwm" > 动态配置 PWM< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#id__id6" data-tocid = "id__id6" > 简要编程指南< / a > < / div > < / li > < / ul > < / div >
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font-family: "Lucida Console", "Courier New", monospace;
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Update Time: 2025-05-19
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