Segmentation fault

GNU Radio
1

I am getting segmentation fault with the following…

src_data = (0xff,)
src = gr.vector_source_b(src_data,False)
#expected_results = (1,0,0,0,0,0,0,0)
op = gr.packed_to_unpacked_bb(1, gr.GR_MSB_FIRST)
op1= gr.head (gr.sizeof_char, 1)
tb.connect(src,op,op1)
dst = gr.vector_sink_b()
tb.connect(op,dst)
tb.connect(op,
gr.file_sink(gr.sizeof_char,
“tx_bytes2chunks.dat”))
tb.connect(op1,
gr.file_sink(gr.sizeof_char, “tx_bytes2bits.dat”))

All that i m trying to do is extract the 1st bit of the vector.
Need help urgently.Am new to GNU radio

2

On Sat, Mar 8, 2008 at 11:20 PM, Manav R. [email protected]
wrote:

tb.connect(op,dst)

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This works for me (note the “del tb” line):

from gnuradio import gr

def print_data(d):
“”“Debugging tool”“”
print ‘Byte\tDec\tHex’
for i in range(len(d)):
b = ord(d[i])
print ‘%4d\t%3d\t %02X’ % (i, b, b)

class MyTopBlock(gr.top_block):
def init(self):
gr.top_block.init(self)

    src_data = (0xff,)
    src = gr.vector_source_b(src_data,False)
    op = gr.packed_to_unpacked_bb(1, gr.GR_MSB_FIRST)
    op1= gr.head (gr.sizeof_char, 1)
    self.connect(src,op,op1)
    dst = gr.vector_sink_b()
    self.connect(op,dst)
    self.connect(op,

gr.file_sink(gr.sizeof_char,“tx_bytes2chunks.dat”))
self.connect(op1, gr.file_sink(gr.sizeof_char,
“tx_bytes2bits.dat”))

def main():
tb = MyTopBlock()
tb.run()
del tb #this makes sure files are flushed
f = open(“tx_bytes2chunks.dat”)
print_data(f.read())
f.close()
f = open(“tx_bytes2bits.dat”)
print_data(f.read())
f.close()

if name == ‘main’:
main()