david
8cd796e3dd
- USB gadget (UAC1 + MIDI) with boot persistence - USB host mode with auto-detection - Pure Data synth patch with ALSA + UDP netreceive MIDI input - MIDI rawmidi-to-UDP bridge (midi-bridge.py) - LED matrix visualization (led-matrix-viz.py via arduino-router RPC) - MCU sketch for LED matrix control (Arduino_RouterBridge + ArduinoGraphics) - Conftest/OPA Rego policy validation suite for .pd files - gen_synth_pd.py: programmatic .pd file generator - System services: midi-bridge, led-matrix-viz, pd-synth-auto, usb-role-detect - Justfile with deploy, enable, diagnostic recipes - Diagnostic script (diag.sh)
69 lines
1.4 KiB
Plaintext
69 lines
1.4 KiB
Plaintext
# ALSA configuration for I2S DAC (e.g. PCM5102, PCM5242, MAX98357)
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# Installed alongside asound.conf — activate via:
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# sudo mv /etc/asound.conf /etc/asound.conf.bak
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# sudo cp /etc/asound-i2s.conf /etc/asound.conf
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#
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# The I2S interface on the Qualcomm DragonWing typically appears as:
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# hw:0,0 (Primary MI2S — default audio path)
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# hw:MI2S,0 (Named MI2S device)
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#
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# Find available devices: aplay -l
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# Default PCM — try common I2S device names
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pcm.!default {
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type plug
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slave {
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pcm "hw:I2S,0"
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format S16_LE
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channels 2
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rate 48000
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}
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hint.description "I2S DAC (48kHz stereo)"
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}
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# Fallback: try hw:0,0 if named device not found
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pcm.i2s-default {
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type plug
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slave {
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pcm "hw:0,0"
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format S16_LE
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channels 2
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rate 48000
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}
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}
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# Software volume control (I2S DACs typically have no hardware mixer)
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pcm.i2s-softvol {
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type softvol
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slave.pcm "hw:I2S,0"
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control {
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name "I2S Playback Volume"
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card I2S
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}
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min_dB -51.0
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max_dB 0.0
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resolution 256
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}
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# Direct hardware access (bypass plug/softvol for low latency)
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pcm.i2s-direct {
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type plug
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slave {
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pcm "hw:I2S,0"
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format S16_LE
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channels 2
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rate 48000
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}
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}
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# Loopback test (no I2S hardware connected)
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pcm.loopback {
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type plug
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slave {
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pcm "hw:Loopback,0,0"
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format S16_LE
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channels 2
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rate 48000
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}
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}
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