zephyrCommon: Make configurable the max number of tones #152

soburi · 2026-02-01T15:32:53Z

Fixed a bug where tone() with duration=0 would stop the tone immediately instead of ringing infinitely.
Allows you to change the maximum number of notes that can be played with tone().
Add a tone_doremi sample to demonstrate how to sounding with tone API

Copilot

Pull request overview

This PR updates the Zephyr Arduino core’s tone() implementation to support more flexible timer allocation by dynamically selecting unused timers, and adds a Kconfig option to control the maximum number of concurrent tones.

Changes:

Add CONFIG_ARDUINO_MAX_TONES (default -1) to configure the tone timer pool size.
Track timer usage via a per-timer pin field and allocate/release timers dynamically in tone()/noTone().

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
cores/arduino/zephyrCommon.cpp	Implements dynamic allocation/release of tone timers and makes the pool size configurable.
Kconfig	Adds `ARDUINO_MAX_TONES` configuration option (default `-1` for auto sizing).

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cores/arduino/zephyrCommon.cpp

Kconfig

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cores/arduino/zephyrCommon.cpp

samples/tone_doremi/README.rst

samples/tone_doremi/src/app.cpp

cores/arduino/zephyrCommon.cpp

Copilot

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

cores/arduino/zephyrCommon.cpp:281

When frequency is 0, the function returns early without clearing the timer state (setting pt->pin = pin_size_t(-1)). This means the timer slot remains allocated to this pin even though it's no longer active. If this pin calls tone() again later, it will find and reuse the same timer, which is fine. However, if the maximum number of timers is reached and this pin's timer is not properly freed, it could prevent other pins from allocating timers. Consider adding pt->pin = pin_size_t(-1); before the return on line 281 to properly free the timer slot.

  if (frequency == 0) {
    gpio_pin_set_dt(spec, 0);
    return;

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cores/arduino/zephyrCommon.cpp

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Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

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cores/arduino/zephyrCommon.cpp

samples/tone_doremi/README.rst

Kconfig

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cores/arduino/zephyrCommon.cpp

samples/tone_doremi/CMakeLists.txt

Copilot

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Fixed a bug where tone() with duration=0 would stop the tone immediately instead of ringing infinitely. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Copilot

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

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cores/arduino/zephyrCommon.cpp

Copilot

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Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

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cores/arduino/zephyrCommon.cpp

Allows you to change the maximum number of notes that can be played with `tone()`. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Add a tone_doremi sample to demonstrate how to sounding with tone API Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

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DhruvaG2000

just one final comment

DhruvaG2000 · 2026-02-10T06:38:21Z

cores/arduino/zephyrCommon.cpp

    pt->pin = pin_size_t(-1);
  } else {
-    if (pin >= 0) {
+    if (pin != pin_size_t(-1)) {


why are these changes inside add tone_doremi sample? Can be very misleading, please split into another commit.

soburi force-pushed the use_available_timer branch 4 times, most recently from d1fa1d4 to 41a8a6b Compare February 3, 2026 23:16

soburi marked this pull request as ready for review February 4, 2026 01:17

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soburi changed the title ~~zephyrCommon: Use available tone timers~~ zephyrCommon: Make configurable the max number of tones Feb 5, 2026

soburi force-pushed the use_available_timer branch from ca91026 to 00dc900 Compare February 5, 2026 14:11

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soburi force-pushed the use_available_timer branch 2 times, most recently from 4c268f9 to 87ba62e Compare February 9, 2026 20:21

cores: arduino: zephyrCommon: Correct tone() behavior with duration=0

2c1184b

Fixed a bug where tone() with duration=0 would stop the tone immediately instead of ringing infinitely. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

soburi force-pushed the use_available_timer branch 2 times, most recently from 8bac16b to 05e7930 Compare February 9, 2026 20:29

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soburi force-pushed the use_available_timer branch from 05e7930 to 309b112 Compare February 9, 2026 21:35

soburi added 2 commits February 10, 2026 06:38

zephyrCommon: Make configurable the max number of tones

5f2137a

Allows you to change the maximum number of notes that can be played with `tone()`. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

samples: Added tone_doremi sample

73f66c6

Add a tone_doremi sample to demonstrate how to sounding with tone API Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

soburi force-pushed the use_available_timer branch from 309b112 to 73f66c6 Compare February 9, 2026 21:38

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zephyrCommon: Make configurable the max number of tones #152

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soburi commented Feb 1, 2026 •

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