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 */