Thank you, Marcus. I've implemented code to get MAC address(hcitool dev) in a black class constructor.
On the other hand, implementing code to get device's clock (hcitool clock) in start() did not work well, maybe due to my little knowledge. Anyway, since I have to get clocks repeatedly, I think it's good to implement in [general_]work(). Ah, my aim is to build a system that takes Bluetooth device's MAC address and clock, and calculates frequency hopping sequence. And finally I want to make GNU Radio react to the calculated hop sequence. (Not only sticking on simulation). I'll post again if further progress. Regards, Jeon. On Wed, Oct 12, 2016 at 9:36 PM, Marcus Müller <marcus.muel...@ettus.com> wrote: > Hi Jeon, > > Your use case is not what you'd use controlport for; I think you've got it > right: use modtool to create a sync block, but set its number of in- and > outputs to zero; override the start() method to spawn a new thread that > contains a function which has a loop that executes the external command, > publishes a message, and repeat. > > Anyway, your requirement: > > > One condition is, I need to retrieve contents from "hcitool clock" as > fast as the system (GNU Radio) can. > > conflicts with the idea of message passing – message passing doesn't allow > backpressure, so you'll just flood the message receiver's message input, > and that would be useless. > > What do you want to do with that data? If it's something that makes sense > to be understood as stream of samples, go for the classical GNU Radio > source block and write the data to the output stream. > > > Best regards, > > Marcus > On 12.10.2016 14:16, Jeon wrote: > > Just get to the point. > > I have a Bluetooth dongle connected to my PC. I can read a MAC address and > internal clock value by typing `hcitool dev` and `hcitool clock` in command > line. You can see demo in link below: > > http://i.imgur.com/hbQcBQq.png > > What I want is to make GNU Radio get those values/contents. > > Currently, I've planned to make a source block expressed in pseudocode: > > work(args) { > file_pointer = popen("hcitool dev"); // or "hcitool clock" > buf = read(fp); > val = some_char_array_manipulation(buf); > publish_message(val); > pclose(file_pointer); > } > > Recently, I found that ControlPort can bridge GNU Radio and other > programs. Well, however, I am new to ControlPort (just used for > PerfMonitor) and seems more complicated than the pseudocode above. > > Which would you recommend? One condition is, I need to retrieve contents > from "hcitool clock" as fast as the system (GNU Radio) can. > > Regards, > Jeon. > > > _______________________________________________ > Discuss-gnuradio mailing > listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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