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fix headphone route, dial in default gain

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This fixes the headphone_output property setter to use the
DAC_ROUTE_MIXER option so the headphone_volume attenuation stage
doesn't get bypassed (as it did previously). This makes it a lot
easier to set non-ear-bleedy volume levels for headphones.
This commit is contained in:
sam blenny 2025-08-25 04:44:02 +00:00
parent 522f615ffe
commit 12d09409be
1 changed files with 37 additions and 23 deletions
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60
adafruit_tlv320.py
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@ -2062,7 +2062,17 @@ class TLV320DAC3100:
@property
def headphone_output(self) -> bool:
"""Headphone output helper with quickstart settings for users.
"""Headphone output helper with quickstart default settings.
If you set this property to True, the setter will set defaults that
are intended for listening at a quiet-ish level with sensitive low
impedance earbuds:
* dac_volume = -30
* headphone_volume = -42.1
* headphone_left_gain = headphone_right_gain = 0
If you set this to False, the setter turns off the headphone amp.
:getter: Return headphone output state: True if either left or right
headphone amplifier is powered, False otherwise.
@ -2078,17 +2088,11 @@ class TLV320DAC3100:
@headphone_output.setter
def headphone_output(self, enabled: bool) -> None:
# =========
# TODO: Consider if this should be changed to a regular function since
# it modifies many properties. Note how the getter above only
# checks the amplifier enable status but this setter does a bunch
# of other stuff.
# =========
if enabled:
self.left_dac = True
self.right_dac = True
self.left_dac_channel_volume = 0
self.right_dac_channel_volume = 0
self.left_dac_channel_volume = -30
self.right_dac_channel_volume = -30
self.left_dac_mute = False
self.right_dac_mute = False
self.left_dac_path = DAC_PATH_NORMAL
@ -2098,10 +2102,18 @@ class TLV320DAC3100:
self._page1._configure_headphone_driver(
left_powered=True, right_powered=True, common=HP_COMMON_1_65V
)
# ========
# TODO: Should probably set self.headphone_volume (-10? -20?)
# ========
self._page1._configure_analog_inputs(left_dac=DAC_ROUTE_HP, right_dac=DAC_ROUTE_HP)
self.headphone_volume = -42.1
# NOTE: If you use DAC_ROUTE_HP here instead of DAC_ROUTE_MIXER,
# the DAC output will bypass the headphone analog volume
# attenuation stage and go straight into the headphone amp. That
# might possibly be useful to save power, but it reduces your gain
# adjustment options. For low impedance headphones, it's helpful to
# have a lot of attenuation between the DAC and the headphone amp.
# Otherwise, you may have to operate the DAC volume setting down
# near the bottom of its usable range.
self._page1._configure_analog_inputs(
left_dac=DAC_ROUTE_MIXER, right_dac=DAC_ROUTE_MIXER
)
self.headphone_left_mute = False
self.headphone_right_mute = False
else:
@ -2109,7 +2121,15 @@ class TLV320DAC3100:
@property
def speaker_output(self) -> bool:
"""Speaker output helper with quickstart settings for users.
"""Speaker output helper with quickstart default settings.
If you set this property to True, the setter will set:
* dac_volume = -30
* speaker_volume = -42.1
* speaker_gain = 6
If you set this to False, the setter turns off the speaker amp.
:getter: Return speaker output state: True if speaker amplifier is
powered, False otherwise.
@ -2121,17 +2141,11 @@ class TLV320DAC3100:
@speaker_output.setter
def speaker_output(self, enabled: bool) -> None:
# =========
# TODO: Consider if this should be changed to a regular function since
# it modifies many properties. Note how the getter above only
# checks the amplifier enable status but this setter does a bunch
# of other stuff.
# =========
if enabled:
self.left_dac = True
self.right_dac = True
self.left_dac_channel_volume = 0
self.right_dac_channel_volume = 0
self.left_dac_channel_volume = -30
self.right_dac_channel_volume = -30
self.left_dac_mute = False
self.right_dac_mute = False
self.left_dac_path = DAC_PATH_NORMAL
@ -2141,7 +2155,7 @@ class TLV320DAC3100:
self._page1._configure_analog_inputs(
left_dac=DAC_ROUTE_MIXER, right_dac=DAC_ROUTE_MIXER
)
self.speaker_volume = -20
self.speaker_volume = -42.1
self.speaker_mute = False
else:
self._page1._set_speaker_enabled(False)