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Read time: 8 minute(s)
< / div > < div class = "- topic/body concept/conbody body conbody" > < section class = "- topic/section section" id = "pwm_configuration__section_hqy_23s_21c" data-ofbid = "pwm_configuration__section_hqy_23s_21c" > < h2 class = "- topic/title title sectiontitle" > 内核配置< / h2 >
< ol class = "- topic/ol ol" id = "pwm_configuration__ol_udc_4fr_sdc" data-ofbid = "pwm_configuration__ol_udc_4fr_sdc" > < li class = "- topic/li li" data-ofbid = "d190773e28__20250121171630" >
< div class = "- topic/div div" >
< div class = "- topic/p p" data-ofbid = "d190773e32__20250121171630" > 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_configuration__codeblock_wg1_3ml_sdc" data-ofbid = "pwm_configuration__codeblock_wg1_3ml_sdc" > make kernel-menuconfig< / pre > < / div >
< p class = "- topic/p p" data-ofbid = "d190773e37__20250121171630" > 或使用简写命令< / p >
< div class = "- topic/p p" data-ofbid = "d190773e40__20250121171630" >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "pwm_configuration__codeblock_uss_hml_sdc" data-ofbid = "pwm_configuration__codeblock_uss_hml_sdc" > make km< / pre >
< / div >
< / div >
< / li > < li class = "- topic/li li" data-ofbid = "d190773e47__20250121171630" >
< div class = "- topic/p p" data-ofbid = "d190773e49__20250121171630" > 在内核配置界面，按如下选择：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "pwm_configuration__pre_iqy_23s_21c" data-ofbid = "pwm_configuration__pre_iqy_23s_21c" > Linux
Device Drivers --->
[*] Pulse-Width Modulation (PWM) Support --->
< *> ArtInChip PWM support
< *> ArtInChip EPWM support
< / pre > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d190773e54__20250121171630" >
< p class = "- topic/p p" data-ofbid = "d190773e56__20250121171630" > 如需设置 PWM 模块的背光控制功能，执行下列配置，否则可跳过。< / p >
< p class = "- topic/p p" data-ofbid = "d190773e59__20250121171630" > 在 SDK 根目录下执行 < span class = "+ topic/keyword sw-d/cmdname keyword cmdname" > make kernel-menuconfig< / span > 或
< span class = "+ topic/keyword sw-d/cmdname keyword cmdname" > make me< / span > ，进入 kernel 的功能配置，按如下选择：< / p >
< div class = "- topic/p p" data-ofbid = "d190773e68__20250121171630" >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "pwm_configuration__pre_jqy_23s_21c" data-ofbid = "pwm_configuration__pre_jqy_23s_21c" > Linux
Device Drivers --->
Graphics support --->
Backlight & LCD device support --->
< *> Lowlevel Backlight controls
< *> Generic PWM based Backlight Driver
< / pre >
< / div >
< / li > < li class = "- topic/li li" data-ofbid = "d190773e74__20250121171630" >
< p class = "- topic/p p" data-ofbid = "d190773e76__20250121171630" > 如使用 logo 功能，须在 Boot 阶段打开屏幕背光，否则可跳过。< / p >
< p class = "- topic/p p" data-ofbid = "d190773e79__20250121171630" > 在 SDK 根目录下执行 < span class = "+ topic/keyword sw-d/cmdname keyword cmdname" > make kernel-menuconfig< / span > 或
< span class = "+ topic/keyword sw-d/cmdname keyword cmdname" > make me< / span > ，进入 kernel 的功能配置，按如下选择：< / p >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "pwm_configuration__pre_kqy_23s_21c" data-ofbid = "pwm_configuration__pre_kqy_23s_21c" > U-Boot
Device Drivers --->
[*] Enable support < strong class = "hl-keyword" > for< / strong > pulse-width modulation devices (PWM)
[*] Enable support < strong class = "hl-keyword" > for< / strong > ArtInChip PWM
Graphics support --->
[*] Generic PWM based Backlight Driver
< / pre >
< / li > < / ol >
< / section > < section class = "- topic/section section" id = "pwm_configuration__section_lqy_23s_21c" data-ofbid = "pwm_configuration__section_lqy_23s_21c" > < h2 class = "- topic/title title sectiontitle" > DTS 参数配置< / h2 >
< p class = "- topic/p p" data-ofbid = "d190773e97__20250121171630" > PWM 驱动支持从 DTS 中配置的自定义参数，如下表所示：< / p >
< div class = "table-container" > < table class = "- topic/table table frame-all" id = "pwm_configuration__table_mqy_23s_21c" data-ofbid = "pwm_configuration__table_mqy_23s_21c" data-cols = "4" > < caption class = "- topic/title title tablecap" data-caption-side = "top" data-is-repeated = "true" > < span class = "table--title-label" > 表< span class = "table--title-label-number" > 1< / span > < span class = "table--title-label-punctuation" > . < / span > < / span > < span class = "table--title" > PWM 自定义参数< / span > < / caption > < colgroup > < col style = "width:17.152658662092623%" / > < col style = "width:18.524871355060036%" / > < col style = "width:30.360205831903947%" / > < col style = "width:33.9622641509434%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row" > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "pwm_configuration__table_mqy_23s_21c__entry__1" > 参数名称< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "pwm_configuration__table_mqy_23s_21c__entry__2" > 类型< / th > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "pwm_configuration__table_mqy_23s_21c__entry__3" > 取值范围< / th > < th class = "- topic/entry entry colsep-0 rowsep-1" id = "pwm_configuration__table_mqy_23s_21c__entry__4" > 功能说明< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__1" > mode< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__2" > String< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__3" > up/down/up-down-count< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__4" > 配置增减模式< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__1" > tb-clk-rate< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__2" > Integer< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__3" > (0, 24000000)< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__4" > 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_configuration__table_mqy_23s_21c__entry__1" > action0< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__2" > String< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__3" > none/low/high/inverse< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__4" > 多个关键时点的触发行为< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__1" > action1< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__2" > String< / td > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__3" > none/low/high/inverse< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "pwm_configuration__table_mqy_23s_21c__entry__4" > 多个关键时点的触发行为< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "pwm_configuration__table_mqy_23s_21c__entry__1" > default-level< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "pwm_configuration__table_mqy_23s_21c__entry__2" > Integer< / td > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "pwm_configuration__table_mqy_23s_21c__entry__3" > [0, 1]< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "pwm_configuration__table_mqy_23s_21c__entry__4" > 默认/初始电平< / td > < / tr > < / tbody > < / table > < / div >
< div class = "- topic/note note note note_note" id = "pwm_configuration__note_ls5_43s_21c" data-ofbid = "pwm_configuration__note_ls5_43s_21c" > < span class = "note__title" > 注：< / span >
< p class = "- topic/p p" data-ofbid = "d190773e167__20250121171630" > 为了方便表达，所有参数名称都省略了前缀 “aic,”。< / p >
< / div >
< p class = "- topic/p p" data-ofbid = "d190773e171__20250121171630" > 表中 action0 和 action1 四种取值的含义，定义如下：< / p >
< div class = "table-container" > < table class = "- topic/table table frame-all" id = "pwm_configuration__table_nqy_23s_21c" data-ofbid = "pwm_configuration__table_nqy_23s_21c" data-cols = "2" > < caption class = "- topic/title title tablecap" data-caption-side = "top" data-is-repeated = "true" > < span class = "table--title-label" > 表< span class = "table--title-label-number" > 2< / span > < span class = "table--title-label-punctuation" > . < / span > < / span > < span class = "table--title" > action0 和 action1 取值含义< / span > < / caption > < colgroup > < col style = "width:46.51162790697674%" / > < col style = "width:53.48837209302325%" / > < / colgroup > < thead class = "- topic/thead thead" > < tr class = "- topic/row" > < th class = "- topic/entry entry colsep-1 rowsep-1" id = "pwm_configuration__table_nqy_23s_21c__entry__1" > Action 类型< / th > < th class = "- topic/entry entry colsep-0 rowsep-1" id = "pwm_configuration__table_nqy_23s_21c__entry__2" > 行为描述< / th > < / tr > < / thead > < tbody class = "- topic/tbody tbody" > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_nqy_23s_21c__entry__1" > none< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "pwm_configuration__table_nqy_23s_21c__entry__2" > 不做任何变化，保持之前的输出电平< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_nqy_23s_21c__entry__1" > low< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "pwm_configuration__table_nqy_23s_21c__entry__2" > 跳变为 0 电平< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-1" headers = "pwm_configuration__table_nqy_23s_21c__entry__1" > high< / td > < td class = "- topic/entry entry colsep-0 rowsep-1" headers = "pwm_configuration__table_nqy_23s_21c__entry__2" > 跳变为 1 电平< / td > < / tr > < tr class = "- topic/row" > < td class = "- topic/entry entry colsep-1 rowsep-0" headers = "pwm_configuration__table_nqy_23s_21c__entry__1" > inverse< / td > < td class = "- topic/entry entry colsep-0 rowsep-0" headers = "pwm_configuration__table_nqy_23s_21c__entry__2" > 跳变为反向的电平，比如从 0 跳变为 1< / td > < / tr > < / tbody > < / table > < / div >
< / section > < section class = "- topic/section section" id = "pwm_configuration__section_lhg_fyn_4dc" data-ofbid = "pwm_configuration__section_lhg_fyn_4dc" > < h2 class = "- topic/title title sectiontitle" > 时钟配置< / h2 >
< p class = "- topic/p p" data-ofbid = "d190773e214__20250121171630" > PWM 模块涉及时钟的衍生关系：< / p >
< figure class = "- topic/fig fig fignone" id = "pwm_configuration__fig_xy3_1js_21c" data-ofbid = "pwm_configuration__fig_xy3_1js_21c" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "pwm_configuration__image_sxm_lbp_g1c" src = "../../../reusables/reused-topics/../../images/pwm/pwm_clk_tree.png" width = "480" alt = "pwm_clk_tree" / > < / div > < br / > < figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 1< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > PWM 模块的时钟衍生关系图< / span > < / figcaption > < / figure >
< p class = "- topic/p p" data-ofbid = "d190773e224__20250121171630" > EWM 模块涉及时钟的衍生关系：< / p >
< figure class = "- topic/fig fig fignone" id = "pwm_configuration__fig_bct_z3s_21c" data-ofbid = "pwm_configuration__fig_bct_z3s_21c" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "pwm_configuration__image_y4x_lbp_g1c" src = "../../../reusables/reused-topics/../../images/pwmcs/epwm_clk_tree.png" width = "480" alt = "epwm_clk_tree" / > < / div > < br / > < figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 2< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > EPWM 模块的时钟衍生关系图< / span > < / figcaption > < / figure >
< div class = "- topic/note note note note_note" id = "pwm_configuration__note_rkx_1js_21c" data-ofbid = "pwm_configuration__note_rkx_1js_21c" > < span class = "note__title" > 注：< / span >
< div class = "- topic/p p" data-ofbid = "d190773e237__20250121171630" > 容易混淆的 sysclk： < ul class = "- topic/ul ul" id = "pwm_configuration__ul_rqy_23s_21c" data-ofbid = "pwm_configuration__ul_rqy_23s_21c" > < li class = "- topic/li li" data-ofbid = "d190773e240__20250121171630" >
< p class = "- topic/p p" data-ofbid = "d190773e242__20250121171630" > PWM 驱动中，按照惯例将父时钟称作 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > sysclk< / span > ，即上图的 PLL INT1。< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d190773e248__20250121171630" >
< p class = "- topic/p p" data-ofbid = "d190773e250__20250121171630" > PWM 硬件 spec 中，将上图中的 PWM Clk 称作 < span class = "+ topic/keyword pr-d/parmname keyword parmname" > sysclk< / span > 。< / p >
< / li > < / ul > < / div >
< / div >
< / section > < section class = "- topic/section section" id = "pwm_configuration__section_sqy_23s_21c" data-ofbid = "pwm_configuration__section_sqy_23s_21c" > < h2 class = "- topic/title title sectiontitle" > D211 配置< / h2 >
< p class = "- topic/p p" data-ofbid = "d190773e263__20250121171630" > < span class = "+ topic/ph sw-d/filepath ph filepath" > common/d211.dtsi< / span > 中的参数配置：< / p >
< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "pwm_configuration__pre_tqy_23s_21c" data-ofbid = "pwm_configuration__pre_tqy_23s_21c" > pwm: pwm@< span class = "hl-number" > 19240000< / span > {
compatible = < span class = "hl-string" > "artinchip,aic-pwm-v1.0"< / span > ;
reg = < < span class = "hl-number" > 0x0< / span > < span class = "hl-number" > 0x19240000< / span > < span class = "hl-number" > 0x0< / span > < span class = "hl-number" > 0x1000< / span > > ;
interrupts-extended = < & plic0 < span class = "hl-number" > 90< / span > IRQ_TYPE_LEVEL_HIGH> ;
#pwm-cells = < < span class = "hl-number" > 3< / span > > ;
clocks = < & cmu CLK_PWM> , < & cmu CLK_PLL_INT1> ;
clock-names = < span class = "hl-string" > "pwm"< / span > , < span class = "hl-string" > "sysclk"< / span > ;
resets = < & rst RESET_PWM> ;
clock-rate = < < span class = "hl-number" > 48000000< / span > > ;
};
epwm: epwm@< span class = "hl-number" > 18200000< / span > {
compatible = < span class = "hl-string" > "artinchip,aic-epwm-v1.0"< / span > ;
reg = < < span class = "hl-number" > 0x0< / span > < span class = "hl-number" > 0x18200000< / span > < span class = "hl-number" > 0x0< / span > < span class = "hl-number" > 0x600< / span > > , < < span class = "hl-number" > 0< / span > < span class = "hl-number" > 0x1820F000< / span > < span class = "hl-number" > 0x0< / span > < span class = "hl-number" > 0x1000< / span > > ;
interrupts-extended = < & plic0 < span class = "hl-number" > 25< / span > IRQ_TYPE_LEVEL_HIGH> ;
#pwm-cells = < < span class = "hl-number" > 3< / span > > ;
clocks = < & cmu CLK_PWMCS> , < & cmu CLK_PLL_INT1> ;
clock-names = < span class = "hl-string" > "pwmcs"< / span > , < span class = "hl-string" > "sysclk"< / span > ;
resets = < & rst RESET_PWMCS> ;
clock-rate = < < span class = "hl-number" > 48000000< / span > > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};< / pre >
< / section > < section class = "- topic/section section" id = "pwm_configuration__section_wwx_s3s_21c" data-ofbid = "pwm_configuration__section_wwx_s3s_21c" > < h2 class = "- topic/title title sectiontitle" > Board 配置< / h2 >
< div class = "- topic/p p" data-ofbid = "d190773e276__20250121171630" >
< ul class = "- topic/ul ul" id = "pwm_configuration__ul_m1c_53s_21c" data-ofbid = "pwm_configuration__ul_m1c_53s_21c" > < li class = "- topic/li li" data-ofbid = "d190773e279__20250121171630" > PWM 通道配置< div class = "- topic/p p" data-ofbid = "d190773e281__20250121171630" > < span class = "+ topic/ph sw-d/filepath ph filepath" > xxx/board.dts< / span >
中的参数配置：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "pwm_configuration__codeblock_cyf_v3s_21c" data-ofbid = "pwm_configuration__codeblock_cyf_v3s_21c" > & pwm {
status = < span class = "hl-string" > "okay"< / span > ;
pinctrl-names = < span class = "hl-string" > "default"< / span > ;
pinctrl-< span class = "hl-number" > 0< / span > = < & pwm2_pins_b> ;
< em class = "hl-comment" > /* mode: up-count, down-count, up-down-count
action: none, low, high, inverse */< / em >
pwm0 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
aic,rise-edge-delay = < < span class = "hl-number" > 10< / span > > ;
aic,fall-edge-delay = < < span class = "hl-number" > 10< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
pwm1 {
aic,mode = < span class = "hl-string" > "down-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
aic,rise-edge-delay = < < span class = "hl-number" > 10< / span > > ;
aic,fall-edge-delay = < < span class = "hl-number" > 10< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
pwm2 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "low"< / span > , < span class = "hl-string" > "none"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > ;
aic,< strong class = "hl-keyword" > default< / strong > -level = < < span class = "hl-number" > 0< / span > > ;
aic,rise-edge-delay = < < span class = "hl-number" > 10< / span > > ;
aic,fall-edge-delay = < < span class = "hl-number" > 10< / span > > ;
status = < span class = "hl-string" > "okay"< / span > ;
};
pwm3 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "low"< / span > , < span class = "hl-string" > "none"< / span > ;
aic,rise-edge-delay = < < span class = "hl-number" > 10< / span > > ;
aic,fall-edge-delay = < < span class = "hl-number" > 10< / span > > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
};
& epwm {
status = < span class = "hl-string" > "disabled"< / span > ;
pinctrl-names = < span class = "hl-string" > "default"< / span > ;
pinctrl-< span class = "hl-number" > 0< / span > = < & epwm0_pins_a> ,
< & epwm1_pins_a> ,
< & epwm2_pins_a> ;
< em class = "hl-comment" > /* mode: up-count, down-count, up-down-count
action: none, low, high, inverse */< / em >
epwm0 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
epwm1 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
epwm2 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
epwm3 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
epwm4 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
epwm5 {
aic,mode = < span class = "hl-string" > "up-count"< / span > ;
aic,tb-clk-rate = < < span class = "hl-number" > 24000000< / span > > ;
< em class = "hl-comment" > /* CBD, CBU, CAD, CAU, PRD, ZRO */< / em >
aic,action0 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
aic,action1 = < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "high"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "none"< / span > , < span class = "hl-string" > "low"< / span > ;
status = < span class = "hl-string" > "disabled"< / span > ;
};
};< / pre > < / div > < / li > < li class = "- topic/li li" id = "pwm_configuration__li_qjm_hjs_21c" data-ofbid = "pwm_configuration__li_qjm_hjs_21c" > 背光控制配置< div class = "- topic/p p" data-ofbid = "d190773e289__20250121171630" > 需要在 < span class = "+ topic/ph sw-d/filepath ph filepath" > xxx/board.dts< / span > 中新增一个
backlight
节点，如下：< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "pwm_configuration__codeblock_b1p_v3s_21c" data-ofbid = "pwm_configuration__codeblock_b1p_v3s_21c" > backlight: backlight {
compatible = < span class = "hl-string" > "pwm-backlight"< / span > ;
< em class = "hl-comment" > /* pwm node name; pwm device No.; period_ns; pwm_polarity */< / em >
pwms = < & pwm < span class = "hl-number" > 2< / span > < span class = "hl-number" > 1000000< / span > < span class = "hl-number" > 0< / span > > ;
brightness-levels = < < span class = "hl-number" > 0< / span > < span class = "hl-number" > 10< / span > < span class = "hl-number" > 20< / span > < span class = "hl-number" > 30< / span > < span class = "hl-number" > 40< / span > < span class = "hl-number" > 50< / span > < span class = "hl-number" > 60< / span > < span class = "hl-number" > 70< / span > < span class = "hl-number" > 80< / span > < span class = "hl-number" > 90< / span > < span class = "hl-number" > 100< / span > > ;
< strong class = "hl-keyword" > default< / strong > -brightness-level = < < span class = "hl-number" > 8< / span > > ;
status = < span class = "hl-string" > "okay"< / span > ;
};< / pre > < / div > < p class = "- topic/p p" data-ofbid = "d190773e296__20250121171630" > 其中 “& pwm 2” 表示要使用 pwm2
通道作为背光控制用（要确认和硬件上的电路连接是一致的）。< / p > < div class = "- topic/p p" data-ofbid = "d190773e298__20250121171630" > 在屏幕 panel 节点中，需要引用
backlight： < pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "pwm_configuration__codeblock_jpc_w3s_21c" data-ofbid = "pwm_configuration__codeblock_jpc_w3s_21c" > panel_lvds {
compatible = < span class = "hl-string" > "artinchip,aic-general-lvds-panel"< / span > ;
data-mapping = < span class = "hl-string" > "vesa-24"< / span > ;
data-channel = < span class = "hl-string" > "single-link1"< / span > ;
backlight = < & backlight> ;
status = < span class = "hl-string" > "okay"< / span > ;
...
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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_configuration__section_hqy_23s_21c" data-tocid = "pwm_configuration__section_hqy_23s_21c" > 内核配置< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_configuration__section_lqy_23s_21c" data-tocid = "pwm_configuration__section_lqy_23s_21c" > DTS 参数配置< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_configuration__section_lhg_fyn_4dc" data-tocid = "pwm_configuration__section_lhg_fyn_4dc" > 时钟配置< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_configuration__section_sqy_23s_21c" data-tocid = "pwm_configuration__section_sqy_23s_21c" > D211 配置< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#pwm_configuration__section_wwx_s3s_21c" data-tocid = "pwm_configuration__section_wwx_s3s_21c" > Board 配置< / a > < / div > < / li > < / ul > < / div >
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