add host software

host/requirements.txt

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+pyusb

host/setcolor.py

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+import usb.util
+import sys
+
+
+def set_color(r, g, b):
+    """
+    Sets the color of the LED.
+    :param r: the 8 bit red value of the color
+    :param g: the 8 bit green value of the color
+    :param b: the 8 bit blue value of the color
+    :return: True if 3 bytes were transmitted, False otherwise
+    """
+    d = [r, g, b]
+    result = dev.ctrl_transfer(0x40, 4, 0, 0, d)
+    return result == 3
+
+if len(sys.argv) != 4:
+    print("must be called with 'color.py red blue green'")
+    sys.exit(1)
+
+red = int(sys.argv[1])
+green = int(sys.argv[2])
+blue = int(sys.argv[3])
+
+# find our device
+dev = usb.core.find(idVendor=0x16c0, idProduct=0x05dc)
+
+# was it found?
+if dev is None:
+    raise ValueError('Device not found')
+
+
+print(set_color(red, green, blue))
+