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products:sbc:common:applications:gpio:pwm

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products:sbc:common:applications:gpio:pwm [2026/09/14 04:58]
nick 		products:sbc:common:applications:gpio:pwm [2026/09/15 03:25] (current)
nick [Control PWM]
Line 14: Line 14:
 ^  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  |  ''PWM_J''     |  35   |  ''GPIOY_5''    |  ''pwm_j''        |Not fixed, using the below command to detect  |
  
 **VIM 5:** **VIM 5:**
 ```shell ```shell
-set -- /sys/bus/platform/devices/fe058400.pwm/pwm/pwmchip* +$ set -- /sys/bus/platform/devices/fe058400.pwm/pwm/pwmchip* 
-PWM_J=$1 +$ PWM_J=$1 
-echo $PWM_J+$ echo $PWM_J
 ``` ```
  
Line 132: Line 132:
 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>
  
Line 230: Line 250:
 echo 500000 | sudo tee /sys/class/pwm/pwmchip0/pwm1/duty_cycle echo 500000 | sudo tee /sys/class/pwm/pwmchip0/pwm1/duty_cycle
 echo 1 | sudo tee /sys/class/pwm/pwmchip0/pwm1/enable echo 1 | sudo tee /sys/class/pwm/pwmchip0/pwm1/enable
 +```
 +
 +<tabbox VIM-5> 
 +
 +```shell
 +set -- /sys/bus/platform/devices/fe058400.pwm/pwm/pwmchip*
 +PWM_J=$1
 +echo 0 | sudo tee "$PWM_J"/export
 +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
 ``` ```
  
Line 251: Line 282:
 ```shell ```shell
 echo 0 | sudo tee /sys/class/pwm/pwmchip1/pwm1/enable echo 0 | sudo tee /sys/class/pwm/pwmchip1/pwm1/enable
 +```
 +<tabbox VIM3L/1S> 
 +```shell
 +echo 0 | sudo tee /sys/class/pwm/pwmchip0/pwm1/enable
 +```
 +<tabbox VIM-5> 
 +```shell
 +set -- /sys/bus/platform/devices/fe058400.pwm/pwm/pwmchip*
 +PWM_J=$1
 +echo 0 | sudo tee "$PWM_J"/pwm0/enable
 ``` ```
 <tabbox VIM3L/1S>  <tabbox VIM3L/1S> 
Last modified: 2026/09/14 04:58 by nick

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