def __init__(self, demodulator, access_code=None, callback=None, threshold=-1):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
Args:
demodulator: instance of demodulator class (gr_block or hier_block2) (complex baseband in)
access_code: AKA sync vector (string of 1's and 0's)
callback: function of two args: ok, payload (ok: bool; payload: string)
threshold: detect access_code with up to threshold bits wrong (-1 -> use default) (int)
"""
gr.hier_block2.__init__(
self, "demod_pkts", gr.io_signature(1, 1, gr.sizeof_gr_complex), gr.io_signature(0, 0, 0) # Input signature
) # Output signature
self._demodulator = demodulator
if access_code is None:
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
if threshold == -1:
threshold = 12 # FIXME raise exception
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self.correlator = digital.correlate_access_code_bb(access_code, threshold)
self.framer_sink = digital.framer_sink_1(self._rcvd_pktq)
self.connect(self, self._demodulator, self.correlator, self.framer_sink)
self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
def test_002(self):
code = tuple(string_to_1_0_list(default_access_code))
access_code = to_1_0_string(code)
header = tuple(
2 * [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0]) # len=2
pad = (0, ) * 100
src_data = code + header + (0, 1, 0, 0, 1, 0, 0, 0) + (0, 1, 0, 0, 1,
0, 0, 1) + pad
expected_data = 'HI'
rcvd_pktq = gr.msg_queue()
src = gr.vector_source_b(src_data)
correlator = digital.correlate_access_code_bb(access_code, 0)
framer_sink = digital.framer_sink_1(rcvd_pktq)
vsnk = gr.vector_sink_b()
self.tb.connect(src, correlator, framer_sink)
self.tb.connect(correlator, vsnk)
self.tb.run()
result_data = rcvd_pktq.delete_head()
result_data = result_data.to_string()
self.assertEqual(expected_data, result_data)
def __init__(self,
demodulator,
access_code=None,
callback=None,
threshold=-1):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
Args:
demodulator: instance of demodulator class (gr_block or hier_block2) (complex baseband in)
access_code: AKA sync vector (string of 1's and 0's)
callback: function of two args: ok, payload (ok: bool; payload: string)
threshold: detect access_code with up to threshold bits wrong (-1 -> use default) (int)
"""
gr.hier_block2.__init__(
self,
"demod_pkts",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(0, 0, 0)) # Output signature
self._demodulator = demodulator
if access_code is None:
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
if threshold == -1:
threshold = 12 # FIXME raise exception
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self.correlator = digital.correlate_access_code_bb(
access_code, threshold)
self.framer_sink = digital.framer_sink_1(self._rcvd_pktq)
self.connect(self, self._demodulator, self.correlator,
self.framer_sink)
self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
def test_002(self):
code = tuple(string_to_1_0_list(default_access_code))
access_code = to_1_0_string(code)
header = tuple(2*[0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0]) # len=2
pad = (0,) * 100
src_data = code + header + (0,1,0,0,1,0,0,0) + (0,1,0,0,1,0,0,1) + pad
expected_data = 'HI'
rcvd_pktq = gr.msg_queue()
src = blocks.vector_source_b(src_data)
correlator = digital.correlate_access_code_bb(access_code, 0)
framer_sink = digital.framer_sink_1(rcvd_pktq)
vsnk = blocks.vector_sink_b()
self.tb.connect(src, correlator, framer_sink)
self.tb.connect(correlator, vsnk)
self.tb.run()
result_data = rcvd_pktq.delete_head()
result_data = result_data.to_string()
self.assertEqual(expected_data, result_data)