def __init__(self, access_code='', threshold=-1, callback=None):
"""
packet_demod constructor.
Args:
access_code: AKA sync vector
threshold: detect access_code with up to threshold bits wrong (0 -> use default)
callback: a function of args: ok, payload
"""
#access code
if not access_code: #get access code
access_code = packet_utils.default_access_code
if not packet_utils.is_1_0_string(access_code):
raise ValueError, "Invalid access_code %r. Must be string of 1's and 0's" % (access_code,)
self._access_code = access_code
#threshold
if threshold < 0: threshold = DEFAULT_THRESHOLD
self._threshold = threshold
#blocks
msgq = gr.msg_queue(DEFAULT_MSGQ_LIMIT) #holds packets from the PHY
correlator = digital.correlate_access_code_bb(self._access_code, self._threshold)
framer_sink = digital.framer_sink_1(msgq)
#initialize hier2
gr.hier_block2.__init__(
self,
"packet_decoder",
gr.io_signature(1, 1, gr.sizeof_char), # Input signature
gr.io_signature(0, 0, 0) # Output signature
)
#connect
self.connect(self, correlator, framer_sink)
#start thread
_packet_decoder_thread(msgq, callback)
def __init__(self, packet_source=None, payload_length=0):
if not payload_length: #get payload length
payload_length = DEFAULT_PAYLOAD_LEN
if payload_length%self._item_size_in != 0: #verify that packet length is a multiple of the stream size
raise ValueError, 'The payload length: "%d" is not a mutiple of the stream size: "%d".'%(payload_length, self._item_size_in)
#initialize hier2
gr.hier_block2.__init__(
self,
"ofdm_mod",
gr.io_signature(1, 1, self._item_size_in), # Input signature
gr.io_signature(1, 1, packet_source._hb.output_signature().sizeof_stream_item(0)) # Output signature
)
#create blocks
msgq = gr.msg_queue(DEFAULT_MSGQ_LIMIT)
msg_sink = blocks.message_sink(self._item_size_in, msgq, False) #False -> blocking
#connect
self.connect(self, msg_sink)
self.connect(packet_source, self)
#start thread
_packet_encoder_thread(msgq, payload_length, packet_source.send_pkt)
def __init__(self, type='BER', win_size=default_win_size, bits_per_symbol=2):
"""
Error rate constructor.
Args:
type: a string 'BER' or 'SER'
win_size: the number of samples to calculate over
bits_per_symbol: the number of information bits per symbol (BER only)
"""
#init
gr.hier_block2.__init__(
self, 'error_rate',
gr.io_signature(2, 2, gr.sizeof_char),
gr.io_signature(1, 1, gr.sizeof_float),
)
assert type in ('BER', 'SER')
self._max_samples = win_size
self._bits_per_symbol = bits_per_symbol
#setup message queue
msg_source = blocks.message_source(gr.sizeof_float, 1)
self._msgq_source = msg_source.msgq()
msgq_sink = gr.msg_queue(2)
msg_sink = blocks.message_sink(gr.sizeof_char, msgq_sink, False) #False -> blocking
inter = blocks.interleave(gr.sizeof_char)
#start thread
self._num_errs = 0
self._err_index = 0
self._num_samps = 0
self._err_array = numpy.zeros(self._max_samples, numpy.int8)
if type == 'BER':
input_watcher(msgq_sink, self._handler_ber)
elif type == 'SER':
input_watcher(msgq_sink, self._handler_ser)
#connect
self.connect(msg_source, self)
self.connect((self, 0), (inter, 0))
self.connect((self, 1), (inter, 1))
self.connect(inter, msg_sink)
