Record the WM8960 mixer state and the audio switch gotcha
Capture works: singing at arm's length reads -34 to -49 dBFS RMS with peaks at -18 dBFS and no clipping. The earlier all-zero recordings were the HAT's hardware Audio ON/OFF switch being off; the codec answers on I2C and looks fully configured either way. Save the stored mixer state (capture +18 dB, input mixer boost on) in pi/wm8960_asound.state. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AFN8nRRCiDiMN7ChBpHJhs
This commit is contained in:
Claude Sonnet 5.5
+13
-12
@@ -62,20 +62,21 @@ printed enclosure, speakers. Work until those arrive is limited to what the Pi,
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`opencv-python-headless==4.10.0.84` with `numpy<2` (system NumPy stays 1.26.4 for ROS), and
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`robot-env.sh` puts the venv first on `PYTHONPATH`; YuNet also needs input sides that are multiples
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of 32. Tested on a sample image and on a live frame (one face found, upright, no flip needed).
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- **Audio: card works, microphones read digital silence (open).** The stock `wm8960-soundcard`
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overlay fails every stream with `wm8960: No MCLK configured` on Ubuntu 24.04: it puts the 12.288 MHz
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fixed clock on the sound card's codec link, but the codec driver reads `mclk` from its own node.
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- **Audio capture works (verified 2026-10-04).** The stock `wm8960-soundcard` overlay fails every
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stream with `wm8960: No MCLK configured` on Ubuntu 24.04: it puts the 12.288 MHz fixed clock on the
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sound card's codec link, but the codec driver reads `mclk` from its own node.
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`pi/overlays/hermes-wm8960.dts` is the stock overlay plus `clocks`/`clock-names` on the codec node;
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`pi/install-audio-overlay.sh` compiles it to `/boot/firmware/overlays/hermes-wm8960.dtbo`, sets
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`dtparam=audio=off` and `dtoverlay=hermes-wm8960`. With it, capture opens at 8-48 kHz. Address
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the card by name (`hw:CARD=wm8960soundcard,DEV=0`): its index changes (it was card 1, then 0).
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But every recording is exactly zero (no noise floor), with every mixer path on and gains maxed.
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Checked: DAPM shows ADCs, input mixers, boost mixers and LINPUT1/RINPUT1 on; registers
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`R25=0xfc`, `R47=0x30`, `R32/33=0x108`; MCLK 12.288 MHz and BCLK 1.536 MHz running; GPIO18-21 in
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`alt0` for the I2S; setting `ALRCGPIO` (R9 bit 6) over I2C made no difference. Not yet checked:
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the HAT's hardware **Audio ON/OFF slide switch** position, MICBIAS, a DAC-to-ADC loopback.
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`Left/Right Input Mixer Boost Switch` default to off and must be turned on for the mic path.
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No speakers on hand, so playback is untested.
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`dtparam=audio=off` and `dtoverlay=hermes-wm8960`. Capture then opens at 8-48 kHz. Address the
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card by name (`hw:CARD=wm8960soundcard,DEV=0`): its index changes (it was card 1, then 0).
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- **The HAT's hardware Audio ON/OFF slide switch (right edge, by the "Audio" label) must be ON.**
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With it off, the codec still answers on I2C and every software check looks right, but all
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recordings are exactly zero. That cost an hour of debugging; check it first.
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- Mixer: `Left/Right Input Mixer Boost Switch` default to off and must be on. Settings in use:
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Capture 47/47 (+18 dB), `Left/Right Input Boost Mixer LINPUT1/RINPUT1` volume 1, input mixer boost
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on. Singing at arm's length: RMS -34 to -49 dBFS, peaks -18 dBFS, no clipping, channels within
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1-2 dB. Saved with `alsactl store` and exported as `pi/wm8960_asound.state`; restoring at boot is
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not yet verified. No speakers on hand, so playback is untested.
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- Not done: PWM (waits for servos). Ask before rebooting the Pi.
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## Package 0b (USB link): Pi side and talos side working
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@@ -0,0 +1,702 @@
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state.wm8960soundcard {
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control.1 {
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iface MIXER
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name 'Capture Volume'
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value.0 47
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value.1 47
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||||
comment {
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||||
access 'read write'
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||||
type INTEGER
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||||
count 2
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||||
range '0 - 63'
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||||
dbmin -1725
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||||
dbmax 3000
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||||
dbvalue.0 1800
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||||
dbvalue.1 1800
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||||
}
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||||
}
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||||
control.2 {
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||||
iface MIXER
|
||||
name 'Capture Volume ZC Switch'
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||||
value.0 false
|
||||
value.1 false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 2
|
||||
}
|
||||
}
|
||||
control.3 {
|
||||
iface MIXER
|
||||
name 'Capture Switch'
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||||
value.0 true
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||||
value.1 true
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||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
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||||
count 2
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||||
}
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||||
}
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||||
control.4 {
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||||
iface MIXER
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||||
name 'Left Input Boost Mixer LINPUT3 Volume'
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||||
value 0
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||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
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||||
count 1
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||||
range '0 - 7'
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||||
dbmin -9999999
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||||
dbmax 600
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||||
dbvalue.0 -9999999
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||||
}
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||||
}
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||||
control.5 {
|
||||
iface MIXER
|
||||
name 'Left Input Boost Mixer LINPUT2 Volume'
|
||||
value 0
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
|
||||
dbmin -9999999
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||||
dbmax 600
|
||||
dbvalue.0 -9999999
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||||
}
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||||
}
|
||||
control.6 {
|
||||
iface MIXER
|
||||
name 'Right Input Boost Mixer RINPUT3 Volume'
|
||||
value 0
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
|
||||
dbmin -9999999
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||||
dbmax 600
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||||
dbvalue.0 -9999999
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||||
}
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||||
}
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||||
control.7 {
|
||||
iface MIXER
|
||||
name 'Right Input Boost Mixer RINPUT2 Volume'
|
||||
value 0
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
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||||
dbmin -9999999
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||||
dbmax 600
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||||
dbvalue.0 -9999999
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||||
}
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||||
}
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||||
control.8 {
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||||
iface MIXER
|
||||
name 'Right Input Boost Mixer RINPUT1 Volume'
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||||
value 1
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||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
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||||
range '0 - 3'
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||||
dbmin 0
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||||
dbmax 2900
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||||
dbvalue.0 1300
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||||
}
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||||
}
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||||
control.9 {
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||||
iface MIXER
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||||
name 'Left Input Boost Mixer LINPUT1 Volume'
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||||
value 1
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||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 3'
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||||
dbmin 0
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||||
dbmax 2900
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||||
dbvalue.0 1300
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||||
}
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||||
}
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||||
control.10 {
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||||
iface MIXER
|
||||
name 'Playback Volume'
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||||
value.0 215
|
||||
value.1 215
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
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||||
count 2
|
||||
range '0 - 255'
|
||||
dbmin -9999999
|
||||
dbmax 0
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||||
dbvalue.0 -2000
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||||
dbvalue.1 -2000
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||||
}
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||||
}
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||||
control.11 {
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||||
iface MIXER
|
||||
name 'Headphone Playback Volume'
|
||||
value.0 101
|
||||
value.1 101
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 2
|
||||
range '0 - 127'
|
||||
dbmin -9999999
|
||||
dbmax 600
|
||||
dbvalue.0 -2000
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||||
dbvalue.1 -2000
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||||
}
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||||
}
|
||||
control.12 {
|
||||
iface MIXER
|
||||
name 'Headphone Playback ZC Switch'
|
||||
value.0 false
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||||
value.1 false
|
||||
comment {
|
||||
access 'read write'
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||||
type BOOLEAN
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||||
count 2
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||||
}
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||||
}
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||||
control.13 {
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||||
iface MIXER
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||||
name 'Speaker Playback Volume'
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||||
value.0 101
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||||
value.1 101
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||||
comment {
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||||
access 'read write'
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||||
type INTEGER
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||||
count 2
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||||
range '0 - 127'
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||||
dbmin -9999999
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||||
dbmax 600
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||||
dbvalue.0 -2000
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||||
dbvalue.1 -2000
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||||
}
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||||
}
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||||
control.14 {
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||||
iface MIXER
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||||
name 'Speaker Playback ZC Switch'
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||||
value.0 false
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||||
value.1 false
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||||
comment {
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||||
access 'read write'
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||||
type BOOLEAN
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||||
count 2
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||||
}
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||||
}
|
||||
control.15 {
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||||
iface MIXER
|
||||
name 'Speaker DC Volume'
|
||||
value 0
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
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||||
count 1
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||||
range '0 - 5'
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||||
}
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||||
}
|
||||
control.16 {
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||||
iface MIXER
|
||||
name 'Speaker AC Volume'
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||||
value 0
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||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
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||||
count 1
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||||
range '0 - 5'
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||||
}
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||||
}
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||||
control.17 {
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||||
iface MIXER
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||||
name 'PCM Playback -6dB Switch'
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||||
value false
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||||
comment {
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||||
access 'read write'
|
||||
type BOOLEAN
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||||
count 1
|
||||
}
|
||||
}
|
||||
control.18 {
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||||
iface MIXER
|
||||
name 'ADC Polarity'
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||||
value 'No Inversion'
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 'No Inversion'
|
||||
item.1 'Left Inverted'
|
||||
item.2 'Right Inverted'
|
||||
item.3 'Stereo Inversion'
|
||||
}
|
||||
}
|
||||
control.19 {
|
||||
iface MIXER
|
||||
name 'ADC High Pass Filter Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.20 {
|
||||
iface MIXER
|
||||
name 'DAC Polarity'
|
||||
value 'No Inversion'
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 'No Inversion'
|
||||
item.1 'Left Inverted'
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||||
item.2 'Right Inverted'
|
||||
item.3 'Stereo Inversion'
|
||||
}
|
||||
}
|
||||
control.21 {
|
||||
iface MIXER
|
||||
name 'DAC Deemphasis Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.22 {
|
||||
iface MIXER
|
||||
name '3D Filter Upper Cut-Off'
|
||||
value High
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 High
|
||||
item.1 Low
|
||||
}
|
||||
}
|
||||
control.23 {
|
||||
iface MIXER
|
||||
name '3D Filter Lower Cut-Off'
|
||||
value Low
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 Low
|
||||
item.1 High
|
||||
}
|
||||
}
|
||||
control.24 {
|
||||
iface MIXER
|
||||
name '3D Volume'
|
||||
value 0
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 15'
|
||||
}
|
||||
}
|
||||
control.25 {
|
||||
iface MIXER
|
||||
name '3D Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.26 {
|
||||
iface MIXER
|
||||
name 'ALC Function'
|
||||
value Off
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 Off
|
||||
item.1 Right
|
||||
item.2 Left
|
||||
item.3 Stereo
|
||||
}
|
||||
}
|
||||
control.27 {
|
||||
iface MIXER
|
||||
name 'ALC Max Gain'
|
||||
value 7
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
|
||||
}
|
||||
}
|
||||
control.28 {
|
||||
iface MIXER
|
||||
name 'ALC Target'
|
||||
value 4
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 15'
|
||||
}
|
||||
}
|
||||
control.29 {
|
||||
iface MIXER
|
||||
name 'ALC Min Gain'
|
||||
value 0
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
|
||||
}
|
||||
}
|
||||
control.30 {
|
||||
iface MIXER
|
||||
name 'ALC Hold Time'
|
||||
value 0
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 15'
|
||||
}
|
||||
}
|
||||
control.31 {
|
||||
iface MIXER
|
||||
name 'ALC Mode'
|
||||
value ALC
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 ALC
|
||||
item.1 Limiter
|
||||
}
|
||||
}
|
||||
control.32 {
|
||||
iface MIXER
|
||||
name 'ALC Decay'
|
||||
value 3
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 15'
|
||||
}
|
||||
}
|
||||
control.33 {
|
||||
iface MIXER
|
||||
name 'ALC Attack'
|
||||
value 2
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 15'
|
||||
}
|
||||
}
|
||||
control.34 {
|
||||
iface MIXER
|
||||
name 'Noise Gate Threshold'
|
||||
value 0
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 31'
|
||||
}
|
||||
}
|
||||
control.35 {
|
||||
iface MIXER
|
||||
name 'Noise Gate Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.36 {
|
||||
iface MIXER
|
||||
name 'ADC PCM Capture Volume'
|
||||
value.0 195
|
||||
value.1 195
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 2
|
||||
range '0 - 255'
|
||||
dbmin -9999999
|
||||
dbmax 3000
|
||||
dbvalue.0 0
|
||||
dbvalue.1 0
|
||||
}
|
||||
}
|
||||
control.37 {
|
||||
iface MIXER
|
||||
name 'Left Output Mixer Boost Bypass Volume'
|
||||
value 2
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
|
||||
dbmin -2100
|
||||
dbmax 0
|
||||
dbvalue.0 -1500
|
||||
}
|
||||
}
|
||||
control.38 {
|
||||
iface MIXER
|
||||
name 'Left Output Mixer LINPUT3 Volume'
|
||||
value 2
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
|
||||
dbmin -2100
|
||||
dbmax 0
|
||||
dbvalue.0 -1500
|
||||
}
|
||||
}
|
||||
control.39 {
|
||||
iface MIXER
|
||||
name 'Right Output Mixer Boost Bypass Volume'
|
||||
value 2
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
|
||||
dbmin -2100
|
||||
dbmax 0
|
||||
dbvalue.0 -1500
|
||||
}
|
||||
}
|
||||
control.40 {
|
||||
iface MIXER
|
||||
name 'Right Output Mixer RINPUT3 Volume'
|
||||
value 2
|
||||
comment {
|
||||
access 'read write'
|
||||
type INTEGER
|
||||
count 1
|
||||
range '0 - 7'
|
||||
dbmin -2100
|
||||
dbmax 0
|
||||
dbvalue.0 -1500
|
||||
}
|
||||
}
|
||||
control.41 {
|
||||
iface MIXER
|
||||
name 'ADC Data Output Select'
|
||||
value 'Left Data = Left ADC; Right Data = Right ADC'
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 'Left Data = Left ADC; Right Data = Right ADC'
|
||||
item.1 'Left Data = Left ADC; Right Data = Left ADC'
|
||||
item.2 'Left Data = Right ADC; Right Data = Right ADC'
|
||||
item.3 'Left Data = Right ADC; Right Data = Left ADC'
|
||||
}
|
||||
}
|
||||
control.42 {
|
||||
iface MIXER
|
||||
name 'DAC Mono Mix'
|
||||
value Stereo
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 Stereo
|
||||
item.1 Mono
|
||||
}
|
||||
}
|
||||
control.43 {
|
||||
iface MIXER
|
||||
name 'DAC Filter Characteristics'
|
||||
value Normal
|
||||
comment {
|
||||
access 'read write'
|
||||
type ENUMERATED
|
||||
count 1
|
||||
item.0 Normal
|
||||
item.1 Sloping
|
||||
}
|
||||
}
|
||||
control.44 {
|
||||
iface MIXER
|
||||
name 'Left Boost Mixer LINPUT2 Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.45 {
|
||||
iface MIXER
|
||||
name 'Left Boost Mixer LINPUT3 Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.46 {
|
||||
iface MIXER
|
||||
name 'Left Boost Mixer LINPUT1 Switch'
|
||||
value true
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.47 {
|
||||
iface MIXER
|
||||
name 'Right Boost Mixer RINPUT2 Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.48 {
|
||||
iface MIXER
|
||||
name 'Right Boost Mixer RINPUT3 Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.49 {
|
||||
iface MIXER
|
||||
name 'Right Boost Mixer RINPUT1 Switch'
|
||||
value true
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.50 {
|
||||
iface MIXER
|
||||
name 'Left Input Mixer Boost Switch'
|
||||
value true
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.51 {
|
||||
iface MIXER
|
||||
name 'Right Input Mixer Boost Switch'
|
||||
value true
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.52 {
|
||||
iface MIXER
|
||||
name 'Left Output Mixer PCM Playback Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.53 {
|
||||
iface MIXER
|
||||
name 'Left Output Mixer LINPUT3 Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.54 {
|
||||
iface MIXER
|
||||
name 'Left Output Mixer Boost Bypass Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.55 {
|
||||
iface MIXER
|
||||
name 'Right Output Mixer PCM Playback Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.56 {
|
||||
iface MIXER
|
||||
name 'Right Output Mixer RINPUT3 Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.57 {
|
||||
iface MIXER
|
||||
name 'Right Output Mixer Boost Bypass Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.58 {
|
||||
iface MIXER
|
||||
name 'Mono Output Mixer Left Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
control.59 {
|
||||
iface MIXER
|
||||
name 'Mono Output Mixer Right Switch'
|
||||
value false
|
||||
comment {
|
||||
access 'read write'
|
||||
type BOOLEAN
|
||||
count 1
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user