The examples you can search for in the code base (recommend you do this)
show syntax such as
def __init__(self, input_rate, sps):
gr.hier_block2.__init__(self, "atsc_rx",
gr.io_signature(1, 1,
gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_char))
# Output signature
On Thu, Feb 4, 2021 at 1:58 PM George Edwards <gedwards....@gmail.com>
wrote:
> Hi Tim,
>
> Thanks for your suggestion! I just tried it and it does not work. The
> Python OOT def __init__(self, ....) method requires that one fills in in_sig
> = xxx and out_sig = xxx.
> I tried your suggestion above for variable number of inputs and set:
> in_sig = [gr.io_signature(1, -1, gr.sizeof_gr_complex)]
>
> and I leave the yml file as is when I had the static number of inputs (in_sig
> = [complex64, complex64, complex64]) shown below
> inputs:
> - domain: stream
> dtype: complex
> multiplicity: '3'
> It gives a TypeError: data type not understood
> I tried a bunch of combinations based on the above change you suggested,
> but GRC kept failing when I tried to run it.!
>
> Thanks again for your suggestion!
> Regards,
> George
>
>
>
> On Thu, Feb 4, 2021 at 8:01 AM Tim Huggins <huggins.timo...@yahoo.com>
> wrote:
>
>> George,
>>
>> I would recommend taking a look at some of the existing blocks that have
>> variable inputs to accomplish this (especially for the YML file). A YML
>> example for a variable input can be found here:
>>
>>
>> https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/grc/blocks_multiply_xx.block.yml
>>
>> I haven't run a test using this line in a python block yet, but two
>> different examples are shown below that I believe should work (or should
>> with some minor tweaks). The first doesn't limit the number of inputs while
>> the second one does (at 8).
>>
>> gr.io_signature(1, -1, gr.sizeof_gr_complex))
>>
>> gr.io_signature(1, 8, gr.sizeof_float)
>>
>> I don't know if there is a complete python reference for GNURadio 3.8,
>> but this should be helpful to get you close as well:
>> https://www.gnuradio.org/doc/sphinx-v3.7.9.2/
>>
>> Good luck,
>>
>> Tim
>>
>> On Thursday, February 4, 2021, 12:01:07 AM EST, George Edwards <
>> gedwards....@gmail.com> wrote:
>>
>>
>> Hi Gavin,
>>
>> Thanks for the information!
>>
>> Does this mean that if I wanted 3 inputs and 5 outputs and all floating
>> point values, then inside the Python code, I simply set
>> in_sig = [numpy.float32]
>> out_sign = [numpy.float32]
>>
>> And, in the yml file I set:
>> inputs:
>> - domain: stream
>> dtype: float
>> multiplicity: '3'
>>
>> outputs:
>> - domain: stream
>> dtype: float
>> multiplicity: '5'
>>
>> Would this be correct?
>> Thanks again for your help!
>>
>> Regards,
>> George
>>
>> On Wed, Feb 3, 2021 at 5:26 PM Gavin Jacobs <apriljunk...@hotmail.com>
>> wrote:
>>
>> In 3.7, you would use the <nports> tag, but in 3.8 the trick to setting
>> multiple ins/outs in the YML file, is the keyword "multiplicity". You
>> can see the details of how to configure here:
>> https://wiki.gnuradio.org/index.php/YAML_GRC
>>
>> YAML GRC - GNU Radio <https://wiki.gnuradio.org/index.php/YAML_GRC>
>> Starting with release 3.8, YAML replaces XML as the file format for GNU
>> Radio Companion. This is triggered by switching from Cheetah to Mako as the
>> templating engine, since Cheetah does not support Python 3.
>> wiki.gnuradio.org
>>
>>
