import serial
from functools import reduce

def _uint8_add(a, b):
	"""Add add two values as unsigned 8-bit values."""
	return ((a & 0xFF) + (b & 0xFF)) & 0xFF

def lcs(length):
	return _uint8_add(~length, 1)

def dcs(data):
	return ~reduce(_uint8_add, data, 0xFF)& 0xFF
	
def read():
	result = []
	length = 0
	# hardcode 12 for reading the bytes
	for i in range(0, 12):
		currentByte = ser.read(1)
		result.append(currentByte)
		# position 9 is the length
		if i == 9:
			length = int(currentByte.encode('hex'), 16)
	for i in range(0, length + 1):
		currentByte = ser.read(1)
		result.append(currentByte)
	return result

def wakeup():
	ser.write([ 0x55, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00])
def write(data):
	length = len(data)
	ser.write([0x00, 0x00, 0xFF, length, lcs(length)] + data  + [dcs(data), 0x00])
def printByteArray(data):
	print [elem.encode("hex") for elem in data]

# open port with speed 115200
ser = serial.Serial('COM3', 115200, timeout=5)
print("opened {0}" . format(ser.name))
	
# wake up 
wakeup()
write([0xD4,0x14,0x01])
result = read()
printByteArray(result)

# get firmware version
write([0xD4,0x02])
result = read()
printByteArray(result)

# get card info
write([0xD4,0x4A,0x01,0x00])
result = read()
printByteArray(result)