Make the buzzer duty cycle variant-tunable - #11628
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Every firmware tone went through tone(), a fixed 50% duty on every core, where a piezo is materially louder at 75-80%; playToneDuty() now holds a note at an explicit duty cycle through ledc on ESP32, HardwarePWM on nRF52 and the PWM block on RP2040, and BUZZER_DUTY_PERCENT defaults to 50 so nothing changes until a variant opts in. The nRF52 backend claims an instance through the cooperative token API and skips HwPWMx[2], which the core's tone() hard-codes and which the ExternalNotificationModule ringtone depends on, falling back to 50% rather than silence when nothing is free; RP2040 calls noTone() first because tone() there drives the pad from PIO, not PWM. The 80% cap is applied in the helper rather than trusted to the variant, and playTones() waits 0.3 of a note after playToneDuty() returns instead of 1.3 after the asynchronous tone(), which leaves the total per note unchanged for all six DURATION_ constants.
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughBuzzer playback now supports configurable duty cycles. ESP32, nRF52, and RP2040 builds use native PWM when applicable. Other cases use ChangesBuzzer duty-cycle playback
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to This change adds configurable louder buzzer playback, but on some nRF52 failures it can report success without producing sound, bypassing the existing fallback and potentially suppressing an alarm. Blocking playback can also overlap with notification ringtones on the shared buzzer, so merge should wait for an owner decision or fixes for these availability risks. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant playTones
participant playToneDuty
participant playToneDutyNative
participant PlatformPWM
participant tone
playTones->>playToneDuty: Play note with configured duty
alt Native PWM applies
playToneDuty->>playToneDutyNative: Play duty-controlled tone
playToneDutyNative->>PlatformPWM: Configure platform PWM
PlatformPWM-->>playToneDutyNative: Hold tone for duration
else Fallback applies
playToneDuty->>tone: Play tone and delay
end
playToneDuty-->>playTones: Complete note playback
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Inline comments:
In `@src/buzz/buzz.cpp`:
- Around line 165-171: Update the PWM setup around HardwarePWM::setMaxValue so
frequencies producing a top value greater than 32767 do not write an unsupported
nRF52 COUNTERTOP value; route those cases through tone(), while preserving the
existing PWM path for supported frequencies.
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The 1 MHz PWM base makes the counter top the period in microseconds, so below roughly 31 Hz it exceeds the 15-bit COUNTERTOP and setMaxValue would write an unsupported value. The check now runs before any PWM instance is claimed, so those frequencies fall back to tone() without taking hardware.
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caveman99
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Every firmware tone goes through
tone(), which is a fixed 50% duty on every core (nRF52 sets half the period, ESP32 writes0x1FFat 10-bit, RP2040 runs a symmetric PIO square wave), and on a piezo 75-80% is materially louder, which matters when the buzzer is an alarm rather than a UI chirp;playToneDuty()holds one note at an explicit duty cycle throughledcon ESP32,HardwarePWMon nRF52 and the PWM block on RP2040, withBUZZER_DUTY_PERCENTdefaulting to 50 so no existing board changes until its variant opts in, and the 80% cap applied in the helper rather than trusted to the variant. The nRF52 backend claims an instance through the cooperative token API and deliberately skipsHwPWMx[2], which the core'stone()hard-codes and which theExternalNotificationModuleringtone therefore depends on, and falls back to 50% rather than going silent when no instance is free;ARCH_NRF54L15also definesARCH_NRF52but ships noHardwarePWM, so it is excluded, and RP2040 callsnoTone()first becausetone()there drives the pad from PIO rather than from the PWM block.playTones()now waits 0.3 of a note afterplayToneDuty()returns instead of 1.3 after the asynchronoustone(), leaving the total per note unchanged for all sixDURATION_constants, and it remains blocking, so a repeating alarm still belongs onExternalNotificationModule, which is untouched.Verified compile-only on
native-windows, which takes the no-backend fallback path; the three backends are covered by CI.Summary by CodeRabbit
New Features
Improvements