def checkFrame(self):
'''
Check if the next frame is available. Return True if we were
successful.
'''
try:
self.populateHeader()
frame_size = self.__header['len']
data = self.__buffer[:frame_size - 2]
crc = self.__buffer[frame_size - 2:frame_size]
crc_val = (ord(crc[0]) << 8) + ord(crc[1])
return checkCRC(data, crc_val)
except (IndexError, KeyError):
return False
def checkFrame(self):
''' Check and decode the next frame
:returns: True if we are successful, False otherwise
'''
start = self.__buffer.find(self.__start)
if start == -1: return False
if start > 0 : # go ahead and skip old bad data
self.__buffer = self.__buffer[start:]
end = self.__buffer.find(self.__end)
if (end != -1):
self.__header['len'] = end
self.__header['uid'] = struct.unpack('>B', self.__buffer[1:2])
self.__header['crc'] = struct.unpack('>H', self.__buffer[end - 2:end])[0]
data = self.__buffer[start + 1:end - 2]
return checkCRC(data, self.__header['crc'])
return False