Dear all,
I got latency when the parameter of the blocks is reconfigured while the top_block is running. Could anyone give some suggestion how to reduce this latency?
The flowgraph that I build is:
message_source --> chunks_to_symbols([-1,1])-->multiply_const_ff --> float_to_short -->usrp_sink_s
When the flow graph is running, I'm suppose to reconfigure the amplitude of the signal, which is implement by reconfiguring the parameter of multiply_const_ff using its sub-function set_k(). However, by changing the parameter I got some latency which makes the data using the previous parameter setting. This means after the set_k() function is called, the first 512 byte of data insert into the flow graph will keep the previous parameter setting.
the code in flow graph running:
tb.start()
try:
while 1:
i = 1
tb.set_amp(2000)
msg_13 = message_from_string(payload_13)# payload_13 contains 13 group of 512 bytes data
tb._ls.msgq.insert_tail(mag_13)
tb.set_amp(0)
while(i < 5)
msg_stop = message_from_string(stop_sign)#stop_sign contains 13 group of 512 bytes data
tb._ls.msgq.insert_tail(msg_stop)
i += 1
tb.wait()
except KeyboardInterrupt
Really appreciate any of your suggestion on the solution! Thank you so much!
Thanks,
Yan