Troubleshooting • Re: Hardware PWM not working with Raspberry Pi 5 4GB

Code:

/* * pwm-gpio12-overlay.dts *//dts-v1/;/plugin/;//#include <dt-bindings/gpio/gpio.h>//#include <dt-bindings/leds/common.h>/ {compatible = "brcm,bcm2835";fragment@0 {target = <&gpio>;__overlay__ {pwm_pins: pwm_pins {brcm,pins = <12>;brcm,function = <4>; /* ALT4 = PWM out */brcm,pull = <0>;};};};fragment@1 {target = <&pwm>;frag1: __overlay__ {pinctrl-names = "default";pinctrl-0 = <&pwm_pins>;/* in Hz */assigned-clock-rates = <750000000>;status = "okay";};};fragment@2 {target-path = "/";__overlay__ {leds: leds@0 {compatible = "pwm-leds";     status = "okay";// available PWM range for LED 0 - 255// PWM LED on PWM0.0 on GPIO12status0: status0 {label = "status0";pwms = <&pwm 0 3500000 0>;pwm-names = "status0";linux,default-trigger = "none";};};};};};

Code:

pi@book13th:~ $ sudo -iSSH is enabled and the default password for the 'pi' user has not been changed.This is a security risk - please login as the 'pi' user and type 'passwd' to set a new password.root@book13th:~# echo 155 > /sys/class/leds/status0/brightnessroot@book13th:~# echo 90 > /sys/class/leds/status0/brightnessroot@book13th:~# echo 0  > /sys/class/leds/status0/brightnessroot@book13th:~# echo 255  > /sys/class/leds/status0/brightnessroot@book13th:~# exitlogoutpi@book13th:~ $ 

Code:

pi@book13th:~ $ sudo cat /sys/kernel/debug/pwmplatform/1f0009c000.pwm, 4 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   (cooling_fan         ): requested enabled period: 41566 ns duty: 24450 ns polarity: inverse usage_powerplatform/1f00098000.pwm, 4 PWM devices pwm-0   (status0             ): requested enabled period: 3500000 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   ((null)              ): period: 0 ns duty: 0 ns polarity: normalplatform/107d517a80.pwm, 2 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normalpi@book13th:~ $ sudo cat /sys/kernel/debug/pwmplatform/1f0009c000.pwm, 4 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   (cooling_fan         ): requested enabled period: 41566 ns duty: 24450 ns polarity: inverse usage_powerplatform/1f00098000.pwm, 4 PWM devices pwm-0   (status0             ): requested enabled period: 3500000 ns duty: 2127450 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   ((null)              ): period: 0 ns duty: 0 ns polarity: normalplatform/107d517a80.pwm, 2 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normalpi@book13th:~ $ sudo cat /sys/kernel/debug/pwmplatform/1f0009c000.pwm, 4 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   (cooling_fan         ): requested enabled period: 41566 ns duty: 24450 ns polarity: inverse usage_powerplatform/1f00098000.pwm, 4 PWM devices pwm-0   (status0             ): requested enabled period: 3500000 ns duty: 1235294 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   ((null)              ): period: 0 ns duty: 0 ns polarity: normalplatform/107d517a80.pwm, 2 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normalpi@book13th:~ $ sudo cat /sys/kernel/debug/pwmplatform/1f0009c000.pwm, 4 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   (cooling_fan         ): requested enabled period: 41566 ns duty: 24450 ns polarity: inverse usage_powerplatform/1f00098000.pwm, 4 PWM devices pwm-0   (status0             ): requested enabled period: 3500000 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   ((null)              ): period: 0 ns duty: 0 ns polarity: normalplatform/107d517a80.pwm, 2 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normalpi@book13th:~ $ sudo cat /sys/kernel/debug/pwmplatform/1f0009c000.pwm, 4 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   (cooling_fan         ): requested enabled period: 41566 ns duty: 24450 ns polarity: inverse usage_powerplatform/1f00098000.pwm, 4 PWM devices pwm-0   (status0             ): requested enabled period: 3500000 ns duty: 3500000 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-3   ((null)              ): period: 0 ns duty: 0 ns polarity: normalplatform/107d517a80.pwm, 2 PWM devices pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal