Thanks Nick! I tried the "selector" idea with a message block and it works fine.
Achilleas On Wed, Mar 27, 2024 at 2:50 PM Nick Foster <bistrom...@gmail.com> wrote: > Achilleas, > > Sure, this is possible. Through Python all things are possible, to > paraphrase. =) > > The message could be, but doesn't have to be, a Gnuradio PMT message > passed via the message passing interface. It is probably easier for your > sending block to simply set a semaphore or condition variable shared by the > toplevel flowgraph and passed into the sending block at construction. The > semaphore is monitored by the toplevel main loop and triggers a > reconfiguration when set. > > You could also use the "Message to Variable" block to set a variable > created in the toplevel flowgraph, and then monitor that variable's value > in the toplevel main loop to trigger reconfiguration. > > The important thing to remember about the above two approaches is that > thread safety requires that you do the reconfiguration in the thread > context of the toplevel main loop. You cannot trigger a reconfiguration via > a callback as each block runs in its own thread. > > You could also try using the "Selector" block to control dataflow through > a static flowgraph without reconfiguring. A pair of such selectors can be > used much the same as filterbank switches in hardware. The selection change > can be triggered via the same "Message to Variable" block. > > There are probably more elegant options as well. These are just the ones > that came to mind immediately. > > Hope this helps, > Nick > > On Wed, Mar 27, 2024 at 9:44 AM Achilleas Anastasopoulos < > anas...@umich.edu> wrote: > >> Hi all, >> >> I sent an email earlier but didn't get any response, so I am restating >> the problem in the hope that I will elicit some feedback. >> >> I would like to be able to reconfigure a flowgraph when a message is >> received by a block. >> Is there a mechanism to do that? >> >> >> Here is why I want to do it: >> I am building a system which uses a lot of resources for initial >> acquisition (think eg, of a FH system that tries to acquire the FH pattern, >> which I have implemented by a massively parallel filter bank). >> Once this is done, I want to "turn off" this part of the RX. >> I was thinking that a block will send an appropriate message once >> acquisition is achieved and this will trigger the reconfiguration of a >> flowgraph. >> >> thanks >> Achilleas >> >> >> >> >> >>
