gistfile1.py

class FramePacket(Structure):
  _fields_ = [ ('header', c_uint8), ('proto_version', c_uint8), ('display_width', c_uint8), ('display_height', c_uint8), \
	             ('retain_delay', c_uint8), ('RESERVED_SPACE', c_uint8 * 24) ]


class AssembledFramePacket(object):
	def __init__(self,frame):
		self._frame = frame

	def create_packet(self):

		# Frame ID
		FRAME_ID = 0x7

		# Frame Commands
		CMD_PING = 0x0
		CMD_STORE = 0x1
		CMD_PLAY = 0x2
		CMD_DEMO = 0x3
		CMD_CLEAR = 0xE
		CMD_WIPE = 0xF

		# Protocol Version (currently 1)
		PROTO_VER = 0x1

		# Display Parameters
		DISP_WIDTH = 8
		DISP_HEIGHT = 8

		# Frame Retain Delay, n * 1/10 second, n = (0x00..0xff) inclusive
		#      Max delay = 25.5 sec
		retain_delay = self._frame._retain_delay

		RESERVED_SPACE = 0x0, 0x0, 0x0, 0x0

		f_header = (FRAME_ID << 4) + CMD_STORE

		packet = FramePacket(f_header, PROTO_VER, DISP_WIDTH, DISP_HEIGHT, retain_delay, RESERVED_SPACE)