Hello,
I would like to ask if there is any possibility to reset Head block after
it has signaled Done - after collecting a number of samples. A simple
callback would be most preferred but only: set_length is defined:
make: blocks.head(${type.size}*${vlen}, ${num_items})
callbacks:
- set_length(${num_items})
While there is a reset method defined in head_impl.h
void reset() { d_ncopied_items = 0; }
void set_length(uint64_t nitems) { d_nitems = nitems; }
I am unable to call it via call in flowgraph.py generated file due to lack
of registered callback. (I already tried setting length to 0 and then back
again, but it didn't reset the block). Should I simply register the
callback like:
templates:
imports: from gnuradio import blocks
make: blocks.head(${type.size}*${vlen}, ${num_items})
callbacks:
- set_length(${num_items})
- reset()
and then rebuild gr-blocks? (and later commit it to GNU Radio github) Or is
there a better solution?
What I am trying to achieve is triggering a measurement of N samples and
saving it to a generated filename via QT GUI checkbox using a Selector and
Head sink.
The renaming and file generation is already solved via callbacks, but after
a single measurement trigger it only generates empty files - no data is fed
into them.
Flowgraph img:
[image: image.png]
Triggering the measurement code: the reset() does not make any effect
def set_trigger_measurment(self, trigger_measurment):
self.trigger_measurment = trigger_measurment
self._trigger_measurment_callback(self.trigger_measurment)
if trigger_measurment == True:
self.blocks_head_0.reset()
self.blocks_file_sink_0.open(testbench_setup_pymodule.get_meas_path(self.distance,
self.rx_gain, self.src_att, self.physical_aoa))
self.blocks_selector_1.set_output_index(self.trigger_measurment)
Kind regards,
Marcin Wachowiak
