Re: [Discuss-gnuradio] Python block, itemsize mismatch

[Martin Braun]

On 03/10/2014 06:57 PM, David Halls wrote:
> Hi,
> 
> I get the following error connecting 'OFDM Serializer' (GNU Radio block
> with complex output), to my own Python block 'blsd_dec_bfb' (with
> complex input)
> 
> "ValueError: itemsize mismatch: ofdm_serializer_vcc0:0 using 8,
> blsd_dec_bfb0:0 using 16"
> 
> This is the code in the beginning of my block
> 
> "class blsd_dec_bfb(gr.basic_block):
> """
> docstring for block blsd_dec_bfb
> """
> def __init__(self, num_packets=1, K=50, K2=20, kA1=4, NA1=8,
> num_carriers=64):
> gr.basic_block.__init__(self,
> name="blsd_dec_bfb",
> in_sig=[numpy.complex],
> out_sig=[numpy.uint8,numpy.uint8,numpy.uint8])"

I think you need to do numpy.complex64 -- not 100%, can you please tell
us if this worked.

M
> 
> the xml is
> 
> "... <sink>
> <name>in</name>
> <type>complex</type>
> </sink>
> <source>
> <name>bA1</name>
> <type>byte</type>
> </source>
> <source>
> <name>bA2</name>
> <type>byte</type>
> </source>
> <source>
> <name>b2</name>
> <type>byte</type>
> </source>..."
> 
> The colours match in the GRC, and it lets me run it (i.e. no complaints
> about type mismatch before run-time).
> 
> I hope it is just a silly mistake. Can anyone help?
> 
> Regards,
> 
> David
> 
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