Migrate MCP and utilities to CircuitPython, including color GIF and volume fixes

scratch/test_playback.py

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+import serial
+import time
+import sys
+
+def run_diagnostic(port):
+    print(f"Opening serial port {port}...")
+    try:
+        ser = serial.Serial(port, 115200, timeout=1)
+    except Exception as e:
+        print("Failed to open serial port:", e)
+        return False
+        
+    print("Interrupting board execution (Ctrl+C)...")
+    for _ in range(30):
+        ser.write(b'\x03')
+        time.sleep(0.02)
+        
+    time.sleep(0.5)
+    ser.read_all()
+    
+    print("Entering raw REPL...")
+    ser.write(b'\x01')
+    time.sleep(0.2)
+    resp = ser.read_all()
+    if b'raw REPL' not in resp and b'OK' not in resp and b'raw' not in resp:
+        print("Could not enter raw REPL:", resp)
+        ser.close()
+        return False
+        
+    # Python code to test playback
+    test_code = """
+import audio_util
+try:
+    print("Starting play_tone test...")
+    audio_util.play_tone(440, 1000, 50)
+    print("play_tone test finished!")
+except Exception as e:
+    import sys
+    sys.print_exception(e)
+"""
+
+    print("Running diagnostic code on the board...")
+    # Send code
+    ser.write(test_code.encode('utf-8'))
+    ser.write(b'\x04') # Ctrl+D to execute
+    
+    time.sleep(0.2)
+    
+    # Read output
+    print("\n--- Board Output ---")
+    start = time.time()
+    while time.time() - start < 5.0:
+        line = ser.readline()
+        if line:
+            print(line.decode('utf-8', 'ignore').strip())
+            
+    # Reset the board to return to normal
+    print("Resetting board to normal...")
+    ser.write(b'\x02') # Ctrl+B to exit raw REPL
+    time.sleep(0.1)
+    ser.write(b'\x03')
+    time.sleep(0.1)
+    ser.write(b"import machine\nmachine.reset()\n")
+    ser.close()
+    return True
+
+if __name__ == "__main__":
+    run_diagnostic('/dev/cu.usbmodem101')