On Mon, Jul 25, 2016 at 9:13 PM, Vanhoy, Garrett M - (gvanhoy) < gvan...@email.arizona.edu> wrote:
> Hello, > > > I have sent this to the list once before, but I did not see it show up on > the index so I am assuming it did not work after waiting some time. > > > I am attempting to embed the liquid DSP > <https://github.com/jgaeddert/liquid-dsp> flexframe protocol in a custom > GNU Radio block. I am doing this by extending the out-of-tree module that Tom > Rondeau recently worked on <https://github.com/trondeau/gr-liquiddsp>. I > am writing a block that embeds the flexframegen and another that embeds a > flexframesync. Since these blocks tend to produce a varying amount of > symbols depending on the coding scheme or modulation, I wrote it as a > general block. You can see the current version of the code at my own fork > <https://github.com/gvanhoy/gr-liquiddsp> > Just a quick note. That work wasn't terribly "recent" and might have bit rotted since I last hacked on it a number of years ago. No guarantee that it will work against current GNU Radio without some updating. I stopped working on it when I was disappointed by the performance of the library. Tom > I am currently having trouble with the generator and occasionally the sync > block as well. However, for the generator, I am getting a return code -11 > (I assume a seg fault) when I attempt to copy a generated frame to the out > buffer and run this in GNURadioCompanion. This often happens after > attempting to copy ~16000 gr_complex items to the outbuffer. Is there a > problems with that amount? Here is my work function code: > > > { > unsigned int buf_len = 1000; > unsigned int payload_len = 4096; > unsigned char header[14]; // Liquid hardcodes this as the length > for the header > unsigned char payload[4096]; > > unsigned char *in = (unsigned char *) input_items[0]; > unsigned char *inbuf = in; > gr_complex *out = (gr_complex *) output_items[0]; > gr_complex *outbuf = (gr_complex *) > malloc(buf_len*sizeof(gr_complex)); > gr_complex *front = out; > int byte_count = 0; > > unsigned char frame_count; > unsigned int total_items = 0; > int frame_complete = 0; > > // Make header > for(int i = 1; i < 14; i++) header[i] = i; > while(byte_count < ((int) ninput_items[0]) - payload_len) { > header[0] = frame_count; > frame_count > 255 ? frame_count = 0 : frame_count++; > memcpy(payload, inbuf, payload_len); > inbuf += payload_len; > byte_count += payload_len; > // Assemble the frame > while (!flexframegen_is_assembled(d_fg)) { > flexframegen_assemble(d_fg, header, payload, payload_len); > } > > // Make the frame in blocks > frame_complete = 0; > while (!frame_complete){ > frame_complete = flexframegen_write_samples(d_fg, outbuf, > buf_len); > memcpy(front, outbuf, buf_len*sizeof(gr_complex)); > front += buf_len; > total_items += buf_len; > } > > // Get frame length > } > > free(outbuf); > consume_each (total_items); > > // Tell runtime system how many output items we produced. > return total_items; > } > > > Any ideas? Thanks for any help. > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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