Merge pull request #84 from Pi4J/PWM_chip2

web pages update to alert users to PWM exception after kernel update

Author: FDelporte

content/blog/2025/20250811-Pi5-PWM-not-working--NoSuchFileException

@@ -0,0 +1,32 @@
+---
+title: "Pi5 PWM Fails with NoSuchFileException"
+date: 2025-08-11
+tags: ["PWM", "LinuxFS"]
+---
+
+2025-08-11, by Tom Aarts
+
+On the Pi5, Pi kernel updates result in the PWM failing. The
+exception details will state /sys/class/pwm/pwmchip2/npwm was not found.
+
+A kernel code update (6.12)  resulted in the objects within /sys/class/pwm
+being numbered differently.  It is most likely the PWM is using
+/sys/class/pwm/pwmchip0.
+
+Until a proper fix is available the following change to your application
+should resolve this error.
+
+```
+
+Added imports
+import com.pi4j.plugin.linuxfs.provider.pwm.LinuxFsPwmProvider;
+import com.pi4j.plugin.linuxfs.provider.pwm.LinuxFsPwmProviderImpl;
+
+Replace newAutoContext
+// Context pi4j = Pi4J.newAutoContext();
+
+Context pi4j = Pi4J.newContextBuilder()
+           .add(new LinuxFsPwmProviderImpl("/sys/class/pwm/",0) )
+            .build();
+
+```

content/documentation/io-examples/pwm.md

@@ -173,6 +173,7 @@ These two values can be controlled via the Pi4J library and are also used intern
 - [Choosing an I/O Provider](../providers/_index.md)
 - [Wikipedia on PWM](https://en.wikipedia.org/wiki/Pulse-width_modulation)
 - [Wikipedia with audio frequencies](https://en.wikipedia.org/wiki/Piano_key_frequencies)
+- [Possible exception](../../blog/2025/20250811-Pi5-PWM-not-working--NoSuchFileException)
 
 ### Code example