Re: [Discuss-gnuradio] Appending SYNC block to data

[Olivier Goyette]

I did a simple test :

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gnuradio/io_signature.h>
#include <stdio.h>
#include "ADD_SYNC_impl.h"

#define TAB_SIZE 420

namespace gr {
  namespace UAT {

    ADD_SYNC::sptr
    ADD_SYNC::make()
    {
      return gnuradio::get_initial_sptr
        (new ADD_SYNC_impl());
    }

    /*
     * The private constructor
     */
    ADD_SYNC_impl::ADD_SYNC_impl()
      : gr::block("ADD_SYNC",
              gr::io_signature::make(1, 1, sizeof(unsigned char)),
              gr::io_signature::make(1, 1, sizeof(unsigned char)))
    {}

    /*
     * Our virtual destructor.
     */
    ADD_SYNC_impl::~ADD_SYNC_impl()
    {
    }

    void
    ADD_SYNC_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
    {
      /* <+forecast+> e.g. ninput_items_required[0] = noutput_items */
    }

    int
    ADD_SYNC_impl::general_work (int noutput_items,
                       gr_vector_int &ninput_items,
                       gr_vector_const_void_star &input_items,
                       gr_vector_void_star &output_items)
    {
      const unsigned char *in = (const unsigned char *) input_items[0];
      char *out = (char *) output_items[0];
      //unsigned long preamble = 0b111010101100110111011010010011100010;
      //unsigned char tab[TAB_SIZE] = {1,1,1,0,1,0,1,0,1,1,0,0,1,1,0,1,1,1,0,1,1,0,1,0,0,1,0,0,1,1,1,0,0,0,1,0};

      for(int i = 0; i < noutput_items; i++)
      {
          out[i] = in[i];
      }

      for(int x = 0; x < TAB_SIZE; x++)
      {
          printf("%u", out[x]);
          printf(" ");
      }
      printf("\n\n");


      consume_each (noutput_items);

      // Tell runtime system how many output items we produced.
      return noutput_items;
    }

  } /* namespace UAT */
} /* namespace gr */

I'm printing the input to the output directly and here is the results :

Generating: '/home/lassena/Documents/top_block.py'

Generating: '/home/lassena/Documents/top_block.py'

Executing: /usr/bin/python2 -u /home/lassena/Documents/top_block.py

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

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I got long chains of '0' and sometimes something comes out but it doesn't make any sense since I'm supposed to be printing only '1' and '0'...There is something i'm missing somewhere.

2016-06-28 13:10 GMT-04:00 Johannes Demel <address@hidden>:

Hi Olivier,

is there a reason, besides you print the values afterwards, that you copy your input data to your tab array?

Write a test which puts in your frame and checks if the output is prepended by your sync word. [syncword, payload].
Just write your preamble to the output buffer and then continue with the input.

Besides, I'd recommend using constants instead of a define for TAB_SIZE.

Cheers
Johannes

On 28.06.2016 18:27, Olivier Goyette wrote:

Hi everyone,

I'm actually coding a SYNC block for my application. I need to append a
36 bits sync word to some data coming from a Reed Solomon encoder. What
I did is to initialize an array with my 36 bits sequence and then,
plugging the data in the rest of the array. The total length of my SYNC
+ PAYLOAD + FEC PARITY is 420. So with basic calculation, 420 - 36 =
384, is the length that is left to fill the array. Actually, I can't get
the data I'm sending into the array. I'm a bit newbie with programming
GNU radio blocks so I'd like some help to understand. I'm giving my code
for you to see :

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gnuradio/io_signature.h>
#include <stdio.h>
#include "ADD_SYNC_impl.h"

#define TAB_SIZE 420

namespace gr {
   namespace UAT {

     ADD_SYNC::sptr
     ADD_SYNC::make()
     {
       return gnuradio::get_initial_sptr
         (new ADD_SYNC_impl());
     }

     /*
      * The private constructor
      */
     ADD_SYNC_impl::ADD_SYNC_impl()
       : gr::block("ADD_SYNC",
               gr::io_signature::make(1, 1, sizeof(unsigned char)),
               gr::io_signature::make(1, 1, sizeof(unsigned char)))
     {}

     /*
      * Our virtual destructor.
      */
     ADD_SYNC_impl::~ADD_SYNC_impl()
     {
     }

     void
     ADD_SYNC_impl::forecast (int noutput_items, gr_vector_int
&ninput_items_required)
     {
       /* <+forecast+> e.g. ninput_items_required[0] = noutput_items */
     }

     int
     ADD_SYNC_impl::general_work (int noutput_items,
                        gr_vector_int &ninput_items,
                        gr_vector_const_void_star &input_items,
                        gr_vector_void_star &output_items)
     {
       const unsigned char *in = (const unsigned char *) input_items[0];
       char *out = (char *) output_items[0];
       //unsigned long preamble = 0b111010101100110111011010010011100010;
       unsigned char tab[TAB_SIZE] =
{1,1,1,0,1,0,1,0,1,1,0,0,1,1,0,1,1,1,0,1,1,0,1,0,0,1,0,0,1,1,1,0,0,0,1,0};

       for(int i = 36; i < TAB_SIZE; i++)
       {
           tab[i] = in[i];// Data should be inserted here???
       }

       for(int x = 0; x < TAB_SIZE; x++)
       {
           printf("%u", tab[x]);// Printing what's in the tab
           printf(" ");
       }
       printf("\n\n");


       consume_each (noutput_items);

       // Tell runtime system how many output items we produced.
       return noutput_items;
     }

   } /* namespace UAT */
} /* namespace gr */

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