Re: [Discuss-gnuradio] Segmentation fault

[Steven Clark]

On Sat, Mar 8, 2008 at 11:20 PM, Manav Rohil <address@hidden> wrote:
>
>  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
>  --
>  Posted via http://www.ruby-forum.com/.
>
>
>  _______________________________________________
>  Discuss-gnuradio mailing list
>  address@hidden
>  http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>


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()