I may have just answered it. I change the sync_block to a basic_block and it seems to be working.
-Tony On Tue, Jun 6, 2017 at 11:12 AM, G Reina <gre...@eng.ucsd.edu> wrote: > I'm creating a Python block that calculates a custom FFT. I need to ensure > that I get at least 1024 data points for every input to the block. > > From my reading, it looks like I should just be able to do this with the > forecast() function in the Python block. So I've done this: > > class blk(gr.sync_block): # other base classes are basic_block, >> decim_block, interp_block >> >> def __init__(self, bandWidthMHz=100.0): # only default arguments here >> """arguments to this function show up as parameters in GRC""" >> gr.sync_block.__init__( >> self, >> name='test', # will show up in GRC >> in_sig=[np.complex64], >> out_sig=[np.float32] >> ) >> # if an attribute with the same name as a parameter is found, >> # a callback is registered (properties work, too). >> self.bandWidthMHz = bandWidthMHz >> self.MM = 0 >> >> def forecast(self, noutput_items, ninput_items_required=1024): >> ninput_items_required[0] = 1024 >> >> def work(self, input_items, output_items): >> if (np.shape(input_items[0])[0] < 1024): >> print(np.shape(input_items[0])) >> output_items[0] = [3.5, -1, 0, 1] >> return len(output_items[0]) >> > > According to the docs, if I set ninput_items_required[0] = 1024, then > forecast should prevent the work from being done until I have at least 1024 > input values. > > Nevertheless, the print statement I have in the work function is showing > that the program gets to the work even when the input_items[0] is much less > (e.g. 24, 102, 960) than 1024. > > Can anyone point me in the right direction? Can I just have the work > function skip execution if len(input_items[0]) < 1024? Or, will that drop > data? > > Thanks for your help. > -Tony > > p.s. I'm just doing this in a Python block from the GRC. So this is not a > custom OOT module. Does that matter? >
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
