onboard audio: JMISC HPH wiring, UCM fix, update scripts for git deploy

2026-06-23 21:25:51 -07:00
parent a135dc4452
commit d239d58c44
22 changed files with 227 additions and 77 deletions
@@ -0,0 +1,132 @@
+#!/bin/bash
+# configure-usb-audio.sh
+# Configure the Arduino Uno Q as a composite USB gadget:
+#   UAC1 (USB Audio Class) + gmidi (USB MIDI)
+#
+# The host sees one device with both an audio sink and a MIDI port,
+# allowing MIDI input over the same USB connection as audio output.
+#
+# Based on Linux USB gadget configfs setup.
+# The Uno Q's USB peripheral controller is exposed via configfs.
+
+set -euo pipefail
+
+GADGET_DIR="/sys/kernel/config/usb_gadget"
+GADGET_NAME="g1"
+UDC_DIR="/sys/class/udc"
+
+# Gadget config
+VID="0x2341"        # Arduino VID
+PID="0x006A"        # Custom PID (Uno Q audio + MIDI)
+SERIAL="$(cat /sys/firmware/devicetree/base/serial-number 2>/dev/null | tr -d '\0' || cat /proc/cpuinfo 2>/dev/null | grep Serial | head -1 | awk '{print $3}' || echo 'UnoQ')"
+MANUFACTURER="Arduino"
+PRODUCT="Uno Q Audio Synth"
+
+# USB audio params
+CHANNELS=2       # stereo out
+SAMPLE_RATE=48000
+SAMPLE_SIZE=2    # bytes (2 = 16-bit; kernel UAC1 gadget expects bytes, not bits)
+
+# Find UDC (USB Device Controller)
+find_udc() {
+    for controller in "$UDC_DIR"/*; do
+        if [ -d "$controller" ]; then
+            basename "$controller"
+            return 0
+        fi
+    done
+    echo "ERROR: No UDC found" >&2
+    exit 1
+}
+
+create_gadget() {
+    local udc="$1"
+
+    # Remove existing gadget if present
+    if [ -d "$GADGET_DIR/$GADGET_NAME" ]; then
+        echo "" > "$GADGET_DIR/$GADGET_NAME/UDC" 2>/dev/null || true
+        for _ in $(seq 1 50); do
+            if [ ! -f "$GADGET_DIR/$GADGET_NAME/UDC" ] || [ -z "$(cat "$GADGET_DIR/$GADGET_NAME/UDC" 2>/dev/null)" ]; then
+                break
+            fi
+            sleep 0.1
+        done
+        for config in "$GADGET_DIR/$GADGET_NAME/configs"/*/; do
+            config=$(basename "$config")
+            for func in "$GADGET_DIR/$GADGET_NAME/configs/$config/"*.*/; do
+                func=$(basename "$func")
+                [ -L "$GADGET_DIR/$GADGET_NAME/configs/$config/$func" ] && rm -f "$GADGET_DIR/$GADGET_NAME/configs/$config/$func"
+            done
+            rmdir "$GADGET_DIR/$GADGET_NAME/configs/$config" 2>/dev/null || true
+        done
+        for func in "$GADGET_DIR/$GADGET_NAME/functions"/*/; do
+            func=$(basename "$func")
+            rmdir "$GADGET_DIR/$GADGET_NAME/functions/$func" 2>/dev/null || true
+        done
+        rmdir "$GADGET_DIR/$GADGET_NAME" 2>/dev/null || true
+    fi
+
+    mkdir -p "$GADGET_DIR/$GADGET_NAME"
+    echo "$VID" > "$GADGET_DIR/$GADGET_NAME/idVendor"
+    echo "$PID" > "$GADGET_DIR/$GADGET_NAME/idProduct"
+    echo "0x0100" > "$GADGET_DIR/$GADGET_NAME/bcdDevice"
+    echo "0x0200" > "$GADGET_DIR/$GADGET_NAME/bcdUSB"
+
+    mkdir -p "$GADGET_DIR/$GADGET_NAME/strings/0x409"
+    echo "$SERIAL" > "$GADGET_DIR/$GADGET_NAME/strings/0x409/serialnumber"
+    echo "$MANUFACTURER" > "$GADGET_DIR/$GADGET_NAME/strings/0x409/manufacturer"
+    echo "$PRODUCT" > "$GADGET_DIR/$GADGET_NAME/strings/0x409/product"
+
+    # Create UAC1 function (audio output, wide host compatibility)
+    mkdir -p "$GADGET_DIR/$GADGET_NAME/functions/uac1.gs0"
+    echo "$CHANNELS" > "$GADGET_DIR/$GADGET_NAME/functions/uac1.gs0/p_chmask"
+    echo "$SAMPLE_RATE" > "$GADGET_DIR/$GADGET_NAME/functions/uac1.gs0/p_srate"
+    echo "$SAMPLE_SIZE" > "$GADGET_DIR/$GADGET_NAME/functions/uac1.gs0/p_ssize"
+    echo "$CHANNELS" > "$GADGET_DIR/$GADGET_NAME/functions/uac1.gs0/c_chmask"
+    echo "$SAMPLE_RATE" > "$GADGET_DIR/$GADGET_NAME/functions/uac1.gs0/c_srate"
+    echo "$SAMPLE_SIZE" > "$GADGET_DIR/$GADGET_NAME/functions/uac1.gs0/c_ssize"
+
+    # Create MIDI function (MIDI input from host)
+    mkdir -p "$GADGET_DIR/$GADGET_NAME/functions/midi.gs0"
+    echo 1 > "$GADGET_DIR/$GADGET_NAME/functions/midi.gs0/in_ports"
+    echo 1 > "$GADGET_DIR/$GADGET_NAME/functions/midi.gs0/out_ports"
+
+    # Create configuration
+    mkdir -p "$GADGET_DIR/$GADGET_NAME/configs/c.1"
+    mkdir -p "$GADGET_DIR/$GADGET_NAME/configs/c.1/strings/0x409"
+    echo "Audio + MIDI" > "$GADGET_DIR/$GADGET_NAME/configs/c.1/strings/0x409/configuration"
+    echo 250 > "$GADGET_DIR/$GADGET_NAME/configs/c.1/MaxPower"
+
+    # Link both functions to the same config (composite device)
+    ln -s "$GADGET_DIR/$GADGET_NAME/functions/uac1.gs0" "$GADGET_DIR/$GADGET_NAME/configs/c.1/"
+    ln -s "$GADGET_DIR/$GADGET_NAME/functions/midi.gs0" "$GADGET_DIR/$GADGET_NAME/configs/c.1/"
+
+    # Bind to UDC
+    echo "$udc" > "$GADGET_DIR/$GADGET_NAME/UDC"
+    echo "USB gadget '$GADGET_NAME' bound to $udc (UAC1 audio + gmidi)"
+}
+
+case "${1:-start}" in
+    start)
+        udc=$(find_udc)
+        create_gadget "$udc"
+        ;;
+    stop)
+        if [ -d "$GADGET_DIR/$GADGET_NAME" ]; then
+            udc=$(cat "$GADGET_DIR/$GADGET_NAME/UDC" 2>/dev/null || true)
+            [ -n "$udc" ] && echo "" > "$GADGET_DIR/$GADGET_NAME/UDC" 2>/dev/null || true
+        fi
+        echo "USB gadget '$GADGET_NAME' stopped"
+        ;;
+    status)
+        if [ -d "$GADGET_DIR/$GADGET_NAME/UDC" ]; then
+            echo "Gadget: $(cat "$GADGET_DIR/$GADGET_NAME/UDC" 2>/dev/null || echo 'not bound')"
+        else
+            echo "Gadget: not configured"
+        fi
+        ;;
+    *)
+        echo "Usage: $0 {start|stop|status}"
+        exit 1
+        ;;
+esac