Re: [Discuss-gnuradio] testing block written in block

[Marcus Müller]

Hi Sreena,

a few quick remarks:
- where does in_arg come from?
- in0 should be seen as a vector of vectors. It's often useful to "print in0.shape", if in0 is a numpy array
- potential mistake: just returning len(input_items[0]). Be *very* aware of what the return value of a work call should be (i.e. the number of items produced). I think you meant to calculate but one sum, is that right?

Greetings,
Marcus

On 18.06.2014 10:57, sreena p h wrote:

Hi 

I'm new to GNU radio and is trying to develop my own block. I want to develop a block that intake a vector and out put sum of the vector elements. I used the out of tree module and followed tutorial using python code. How should be the arguments of blocks.vector_source_f to be given if i am inputting vector stream of four integers is used. the python code and test file is given below. 

Code: 

 def __init__(self, in_arg):
        gr.sync_block.__init__(self,
            name="sream_ff",
            in_sig=[(numpy.float32, 4)],
            out_sig=[numpy.float32])
    def work(self, input_items, output_items):
        in0 = input_items[0]
        out = output_items[0]
        # <+signal processing here+>
        out[:] = sum(in0)*in_arg
        return len(output_items[0])

Test code:

def test_001_t (self):
        src_data = (([1,1,1,1],4), ([1,2,3,4],4))
        expected_result = (8, 20)
        src = ""
        fxn = sream_ff(2)
        snk = blocks.vector_sink_f()
        # set up fg
        self.tb.connect(src, fxn)
        self.tb.connect(fxn, snk)
        self.tb.run ()
        # check data
        result_data = snk.data ()
        self.assertFloatTuplesAlmostEqual (expected_result, result_data, 6)

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