I am having difficulty using gr::filter::firdes in my OOT cpp block. (Trying to use code block in notorious webmail editor for gmail, sorry if this gets a little garbled)
I am calling my setter function as follows... ```cpp set_filter( 31.25f, 50.0f, 96.0f ); ``` And this is the setter function at the moment while I am troubleshooting... ```cpp void my_sink_c_impl::set_filter( float passband, float stopband, float attenuation ) { std::printf( "set_filter samp_rate %f passband %f stopband %f attenuation %f\n", d_samp_rate, passband, stopband, attenuation ); delete d_in_decim_lpf; std::printf( "set_filter 1\n" ); gr_vector_float taps = gr::filter::firdes::low_pass_2( 1, 1, 0.2, 0.1, 60 ); /* gr_vector_float taps = gr::filter::firdes::low_pass_2( 1, d_samp_rate, ( stopband - passband ) / 2, // 'cutoff' (center of transition band) or just passband (beginning of transition band)? stopband - passband, attenuation, gr::filter::firdes::WIN_BLACKMAN_hARRIS ); */ std::printf( "set_filter 2\n" ); //d_in_decim_lpf = new gr::filter::kernel::fft_filter_ccf( d_samp_per_sym, taps, 1 ); std::printf( "set_filter 3\n" ); //d_in_filt_samp_per_step = d_in_decim_lpf->set_taps( taps ); std::printf( "set_filter 4\n" ); } ``` Note that my block does not do anything with d_in_decim_lpf (or d_in_filt_samp_per_step for that matter) yet except try to set it up by calling this from the constructor. When I make clean / make / sudo make install / sudo ldconfig, then reload blocks in grc and try to run my flowgraph... It prints the first printf (with the params) and then stops with a return value of -11 (segfault?) My guess is that the second printf ('1') works but is interrupted before executing by an error in the next line It does this regardless of whether I uncomment/comment the firdes call the way I want it (the multline version) or use the firdes call I copied from Tom Rondeau's (albeit pythonic - maybe I am goofing my translation to cpp) ageless example shown. I tried leaving off the window type (using the default Hamming) but that was not it. Since the values might be a little extreme for my 2k sample rate I am using (64 x cutoff freq) I also tried it with Tom's old example. If I comment out both versions of trying to call firdes to generate taps, then it prints all the goodies and the flowgraph runs fine. I must be doing something wrong at a basic level here. Any ideas? Thanks. John