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< / 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， ： < 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 > /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 > > 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 > > 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 > > 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 > > 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 > > 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， < 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 > > /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 > > /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， < / 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 > > /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 > > /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 > > /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 > > /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 > > /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 > > /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 > > /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 > > /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 > > /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 >
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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 = "#pwm_debug_guide__section_tnj_ljs_21c" data-tocid = "pwm_debug_guide__section_tnj_ljs_21c" > 调试开关< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_debug_guide__section_ynj_ljs_21c" data-tocid = "pwm_debug_guide__section_ynj_ljs_21c" > 查看 Sysfs 中的状态信息< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_debug_guide__section_zvv_b5r_sdc" data-tocid = "pwm_debug_guide__section_zvv_b5r_sdc" > 查看 Sysfs 中的背光设置< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_debug_guide__section_czn_c5r_sdc" data-tocid = "pwm_debug_guide__section_czn_c5r_sdc" > 动态配置 PWM 通道< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_debug_guide__section_xhp_3wr_sdc" data-tocid = "pwm_debug_guide__section_xhp_3wr_sdc" > < span class = "+ topic/ph sw-d/filepath ph filepath" > config< / span > 节点参数描述< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_debug_guide__section_b2t_hyr_sdc" data-tocid = "pwm_debug_guide__section_b2t_hyr_sdc" > 脉冲输出方向与 Action 配置< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_debug_guide__section_cyc_kzr_sdc" data-tocid = "pwm_debug_guide__section_cyc_kzr_sdc" > 指定脉冲数目输出依赖中断< / a > < / div > < / li > < / ul > < / div >
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