Display Speck 2e dvs#
An example that uses a Speck2eDevKit to display output spike events of speck2e model in visualizer.
This example bases on packages :
- samna 0.30.9
Structure:

from multiprocessing import Process
import samna
import samnagui
def open_speck2e():
return samna.device.open_device("Speck2eDevKit:0")
def build_samna_event_route(dk, dvs_graph, streamer_endpoint):
# build a graph in samna to show dvs
_, _, streamer = dvs_graph.sequential(
[dk.get_model_source_node(), "Speck2eDvsToVizConverter", "VizEventStreamer"]
)
config_source, _ = dvs_graph.sequential(
[samna.BasicSourceNode_ui_event(), streamer]
)
streamer.set_streamer_endpoint(streamer_endpoint)
if streamer.wait_for_receiver_count() == 0:
raise Exception(f"connecting to visualizer on {streamer_endpoint} fails")
return config_source
def open_visualizer(window_width, window_height, receiver_endpoint):
# start visualizer in a isolated process which is required on mac, intead of a sub process.
gui_process = Process(
target=samnagui.run_visualizer,
args=(receiver_endpoint, window_width, window_height),
)
gui_process.start()
return gui_process
streamer_endpoint = "tcp://0.0.0.0:40000"
gui_process = open_visualizer(0.75, 0.75, streamer_endpoint)
dk = open_speck2e()
stopWatch = dk.get_stop_watch()
stopWatch.set_enable_value(True) # open timestamp
# route events
dvs_graph = samna.graph.EventFilterGraph()
config_source = build_samna_event_route(dk, dvs_graph, streamer_endpoint)
dvs_graph.start()
config_source.write(
[
samna.ui.VisualizerConfiguration(
plots=[samna.ui.ActivityPlotConfiguration(128, 128, "DVS Layer")]
)
]
)
# modify configuration
config = samna.speck2e.configuration.SpeckConfiguration()
config.dvs_layer.monitor_enable = True
dk.get_model().apply_configuration(config)
# wait until visualizer window destroys.
gui_process.join()
dvs_graph.stop()