Re: What Is The Proper Way To Change Block Parameters in cpp?

[sp h]

For HackRF info there is this delay but it is 5 seconds..........

On Wed, Oct 20, 2021 at 9:50 PM sp h <stackprogramer@gmail.com> wrote:

I reform for Hackrf this problem is not in python  GRC and CPP, but for USRP i had problem delay in CPP and python GRC

why USRP is so bad in this situation...........

On Wed, Oct 20, 2021 at 9:45 PM sp h <stackprogramer@gmail.com> wrote:

I developed some blocks for Gnuradio in CPP, I defined a multiply constant for a top block in Gnuradio...

I run tb(Top block) block, and USRP sends a signal... when USRP is sending a signal I want to change the multiply constant value set to 0 1 5 and.....

when i used the method...    multiplyControl->set_k(1);

it changes the constant value and the method multiplyControl->k() return constant is changed.......

but signal USRP is changed after 20-30 seconds???????????????????

in GRC and Python, I had no problem but in CPP I had a problem with delay? how can fix it in CPP...

any guide or solution that I can change parameter block when is top block is running........

thanks in advance

 

gr::blocks::multiply_const_cc::sptr multiplyControl(gr::blocks::multiply_const_cc::make(1, 1));

gr::blocks::file_source::sptr file_source(

                    gr::blocks::file_source::make(8,fileSelected.c_str(), "true"));

        this->tb->connect(file_source, 0, multiplyControl, 0);

        if(transmitterDevice=="usrp2")

        {

            this->tb->connect(multiplyControl, 0, this->sinkUHD, 0);

        }

        else

        {

            this->tb->connect(multiplyControl, 0, this->sink, 0);

        }