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Odroid-Go: Unmute+Mute buzzer before/after Playback #52

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Merged
ThomasFarstrike merged 1 commit into from
Feb 21, 2026
Merged

Odroid-Go: Unmute+Mute buzzer before/after Playback #52

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41 changes: 32 additions & 9 deletions internal_filesystem/lib/mpos/audio/audiomanager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -31,26 +31,38 @@ class AudioManager:
STREAM_ALARM = 2 # Alarms/alerts (highest priority)

_instance = None # Singleton instance

def __init__(self, i2s_pins=None, buzzer_instance=None, adc_mic_pin=None):

def __init__(
self,
i2s_pins=None,
buzzer_instance=None,
adc_mic_pin=None,
pre_playback=None,
post_playback=None,
):
"""
Initialize AudioManager instance with optional hardware configuration.

Args:
i2s_pins: Dict with 'sck', 'ws', 'sd' pin numbers (for I2S/WAV playback)
buzzer_instance: PWM instance for buzzer (for RTTTL playback)
adc_mic_pin: GPIO pin number for ADC microphone (for ADC recording)
pre_playback: Optional callback called before starting playback
post_playback: Optional callback called after stopping playback
"""
if AudioManager._instance:
return
AudioManager._instance = self

self._i2s_pins = i2s_pins # I2S pin configuration dict (created per-stream)
self._buzzer_instance = buzzer_instance # PWM buzzer instance
self._adc_mic_pin = adc_mic_pin # ADC microphone pin
self._current_stream = None # Currently playing stream
self._current_recording = None # Currently recording stream
self._volume = 50 # System volume (0-100)
self._i2s_pins = i2s_pins # I2S pin configuration dict (created per-stream)
self._buzzer_instance = buzzer_instance # PWM buzzer instance
self._adc_mic_pin = adc_mic_pin # ADC microphone pin
self.pre_playback = pre_playback
self.post_playback = post_playback

self._current_stream = None # Currently playing stream
self._current_recording = None # Currently recording stream
self._volume = 50 # System volume (0-100)

# Build status message
capabilities = []
Expand All @@ -60,7 +72,7 @@ def __init__(self, i2s_pins=None, buzzer_instance=None, adc_mic_pin=None):
capabilities.append("Buzzer (RTTTL)")
if adc_mic_pin:
capabilities.append(f"ADC Mic (Pin {adc_mic_pin})")

if capabilities:
print(f"AudioManager initialized: {', '.join(capabilities)}")
else:
Expand Down Expand Up @@ -123,6 +135,11 @@ def _playback_thread(self, stream):
stream: Stream instance (WAVStream or RTTTLStream)
"""
self._current_stream = stream
if self.pre_playback:
try:
self.pre_playback()
except Exception as e:
print(f"AudioManager: pre_playback callback error: {e}")

try:
# Run synchronous playback in this thread
Expand All @@ -134,6 +151,12 @@ def _playback_thread(self, stream):
if self._current_stream == stream:
self._current_stream = None

if self.post_playback:
try:
self.post_playback()
except Exception as e:
print(f"AudioManager: post_playback callback error: {e}")

def play_wav(self, file_path, stream_type=None, volume=None, on_complete=None):
"""
Play WAV file via I2S.
Expand Down
29 changes: 26 additions & 3 deletions internal_filesystem/lib/mpos/board/odroid_go.py
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Original file line number Diff line number Diff line change
Expand Up @@ -62,9 +62,32 @@

print("odroid_go.py init buzzer")
buzzer = PWM(Pin(BUZZER_PIN, Pin.OUT, value=1), duty=5)
dac_pin = Pin(BUZZER_DAC_PIN, Pin.OUT, value=1)
dac_pin.value(1) # Unmute
AudioManager(i2s_pins=None, buzzer_instance=buzzer)


class BuzzerCallbacks:
__slots__ = ("dac_pin",)

def __init__(self):
self.dac_pin = Pin(BUZZER_DAC_PIN, Pin.OUT, value=1)

def unmute(self):
print("Unmute buzzer")
self.dac_pin.value(1) # Unmute

def mute(self):
print("Mute buzzer")
self.dac_pin.value(0) # Mute


buzzer_callbacks = BuzzerCallbacks()
AudioManager(
i2s_pins=None,
buzzer_instance=buzzer,
# The buzzer makes noise when it's unmuted, to avoid this we
# mute it after playback and vice versa unmute it before playback:
pre_playback=buzzer_callbacks.unmute,
post_playback=buzzer_callbacks.mute,
)
AudioManager.set_volume(40)
AudioManager.play_rtttl("Star Trek:o=4,d=20,b=200:8f.,a#,4d#6.,8d6,a#.,g.,c6.,4f6")
while AudioManager.is_playing():
Expand Down
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