samples: fade_led: fix build error when PWM is not enabled #85281
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Some boards may define LEDs but disable them by default due to conflicts with other peripherals. In this case, the new sample code introduced in a5fd92b ("samples: fade_led: use all available LEDs") fails to build with a missing symbol error. Fix this by checking if the PWM device (the parent of the LED alias) is enabled before using it. This implicitly discards invalid aliases. Signed-off-by: Luca Burelli <l.burelli@arduino.cc>
pillo79
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soburi
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Feb 6, 2025
kartben
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The Arduino Nano 33 BLE defines a PWM LED whose controller is disabled by default due to conflicts with other peripherals:
zephyr/boards/arduino/nano_33_ble/arduino_nano_33_ble-common.dtsi
Lines 66 to 75 in 8df1591
In this case, the new sample code introduced in a5fd92b fails to build with a missing symbol error because it assumes defined nodes are usable.
Fix this by checking in the sample if the PWM device (the parent of the LED alias) is enabled before using it. This implicitly discards invalid aliases, as before.