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products:sbc:common:applications:gpio:pwm

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products:sbc:common:applications:gpio:pwm [2024/08/06 08:35]
nick 		products:sbc:common:applications:gpio:pwm [2026/09/15 03:25] (current)
nick [Control PWM]
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 |         ^  PWM           ^  PIN  ^  GPIO name      ^  DT overlay node  ^  Device node              ^ |         ^  PWM           ^  PIN  ^  GPIO name      ^  DT overlay node  ^  Device node              ^
-^  VIM1   |  ''PWM_AO_A''  |  35   |  ''GPIOAO_3''   |  ''pwm_ao_a''     |  /sys/class/pwm/pwmchip4  | +^  VIM1   |  ''PWM_AO_A''  |  35   |  ''GPIOAO_3''   |  ''pwm_ao_a''     |/sys/class/pwm/pwmchip4  | 
-^  VIM2   |  ''PWM_D''     |  35   |  ''GPIODV_28''  |  ''pwm_d''        |  /sys/class/pwm/pwmchip1  | +^  VIM2   |  ''PWM_D''     |  35   |  ''GPIODV_28''  |  ''pwm_d''        |/sys/class/pwm/pwmchip1  | 
-^  VIM3   |  ''PWM_F''     |  35   |  ''GPIOH_5''    |  ''pwm_f''        |  /sys/class/pwm/pwmchip4  | +^  VIM3   |  ''PWM_F''     |  35   |  ''GPIOH_5''    |  ''pwm_f''        |/sys/class/pwm/pwmchip4  | 
-^  VIM3L  |  ''PWM_F''     |  35   |  ''GPIOH_5''    |  ''pwm_f''        | /sys/class/pwm/pwmchip0   | +^  VIM3L  |  ''PWM_F''     |  35   |  ''GPIOH_5''    |  ''pwm_f''        |/sys/class/pwm/pwmchip0   | 
-^  VIM4   |  ''PWM_F''     |  35   |  ''GPIOY_8''    |  ''pwm_f''        |  /sys/class/pwm/pwmchip4  | +^  VIM4   |  ''PWM_F''     |  35   |  ''GPIOY_8''    |  ''pwm_f''        |/sys/class/pwm/pwmchip4  | 
-^  VIM1S  |  ''PWM_F''     |  35   |  ''GPIOZ_6''    |  ''pwm_f''        |  /sys/class/pwm/pwmchip0  |+^  VIM1S  |  ''PWM_F''     |  35   |  ''GPIOZ_6''    |  ''pwm_f''        |/sys/class/pwm/pwmchip0  | 
 +^  VIM-5  |  ''PWM_J''     |  35   |  ''GPIOY_5''    |  ''pwm_j''        |Not fixed, using the below command to detect  | 
 + 
 +**VIM 5:** 
 +```shell 
 +$ set -- /sys/bus/platform/devices/fe058400.pwm/pwm/pwmchip* 
 +$ PWM_J=$1 
 +$ echo $PWM_J 
 +``` 
  
  
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 device  export  npwm  power  subsystem  uevent  unexport device  export  npwm  power  subsystem  uevent  unexport
 ``` ```
 +<tabbox VIM-5>
 +
 +Edit ''/boot/dtb/amlogic/kvim-5.dtb.overlay.env'' to add pwm node to ''fdt_overlays'' node if it doesn't exist.
 +
 +You need to add ''pwm_j'' to node ''fdt_overlays'' if it doesn't exist to enable ''PWM_J''.
 +
 +```shell
 +fdt_overlays=pwm_j
 +
 +```
 +
 +After reboot, you will see the pwm device node.
 +
 +```shell
 +$ set -- /sys/bus/platform/devices/fe058400.pwm/pwm/pwmchip*
 +$ PWM_J=$1
 +$ ls $PWM_J
 +device  export  npwm  power  subsystem  uevent  unexport
 +```
 +
 </tabbox> </tabbox>
  
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 The ''PWM'' function is disabled by default, you need to modify the dts to enable it. The ''PWM'' function is disabled by default, you need to modify the dts to enable it.
  
-```+```diff
 diff --git a/arch/arm64/boot/dts/amlogic/kvim4.dts b/arch/arm64/boot/dts/amlogic/kvim4.dts diff --git a/arch/arm64/boot/dts/amlogic/kvim4.dts b/arch/arm64/boot/dts/amlogic/kvim4.dts
 --- a/arch/arm64/boot/dts/amlogic/kvim4.dts --- a/arch/arm64/boot/dts/amlogic/kvim4.dts
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 The ''PWM'' function is disabled by default, you need to modify the dts to enable it. The ''PWM'' function is disabled by default, you need to modify the dts to enable it.
  
-```+```diff
 --- a/arch/arm64/boot/dts/amlogic/kvim1s.dts --- a/arch/arm64/boot/dts/amlogic/kvim1s.dts
 +++ b/arch/arm64/boot/dts/amlogic/kvim1s.dts +++ b/arch/arm64/boot/dts/amlogic/kvim1s.dts
Line 223: Line 252:
 ``` ```
  
-<tabbox VIM4/4N with 5.15 kernel> +<tabbox VIM-5> 
  
 ```shell ```shell
-echo 1 | sudo tee /sys/class/pwm/pwmchip12/export +set -- /sys/bus/platform/devices/fe058400.pwm/pwm/pwmchip* 
-echo 1000000 | sudo tee /sys/class/pwm/pwmchip12/pwm1/period +PWM_J=$1 
-echo 500000 | sudo tee /sys/class/pwm/pwmchip12/pwm1/duty_cycle +echo 0 | sudo tee "$PWM_J"/export 
-echo 1 | sudo tee /sys/class/pwm/pwmchip0/pwm12/enable+echo 1000000 | sudo tee "$PWM_J"/pwm0/period 
 +echo 500000 | sudo tee "$PWM_J"/pwm0/duty_cycle 
 +echo 1 | sudo tee "$PWM_J"/pwm0/enable
 ``` ```
  
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 echo 0 | sudo tee /sys/class/pwm/pwmchip0/pwm1/enable echo 0 | sudo tee /sys/class/pwm/pwmchip0/pwm1/enable
 ``` ```
- +<tabbox VIM-5> 
-<tabbox VIM4/4N with 5.15 kernel> +
 ```shell ```shell
-echo 0 | sudo tee /sys/class/pwm/pwmchip12/pwm1/enable+set -- /sys/bus/platform/devices/fe058400.pwm/pwm/pwmchip* 
 +PWM_J=$1 
 +echo 0 | sudo tee "$PWM_J"/pwm0/enable 
 +``` 
 +<tabbox VIM3L/1S>  
 +```shell 
 +echo 0 | sudo tee /sys/class/pwm/pwmchip0/pwm1/enable
 ``` ```
  
Last modified: 2024/08/06 08:35 by nick

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