[Discuss-gnuradio] Re: problem with start/end of burst inband FPGA code

[Hugh Brunk]

George-

> > We'd greatly appreciate any help, thanks!
>   

I noticed that you're asserting 'skip' in the WAIT state for a starting packet, 
and in the HEADER state for later packets.  Without more code, I can't tell if 
this makes any difference.  You might try rewriting it to have the same state 
transitions and assertion of 'skip' for all packets of a burst.

/Hugh


something like this:

modify the second half of HEADER state like:

   if (fifodata[`STARTOFBURST] == 1)
       // new burst; use clk to decide whether to skip
       trash <= 0;
   payload_len <= fifodata[`PAYLOAD] ;
   read_len <= 0;
   reader_state <= TIMESTAMP;   
   rdreq <= 1;
	                           
and then change the WAIT state as:


   begin
       if (tx_strobe == 1)
           tx_empty <= 1 ;
	                         
       if (trash == 1) //skip second and later packets flagged as trash
           begin
                reader_state <= IDLE;
                skip <= 1;
            end
       else if ((timestamp < (adc_time + `JITTER)
                                     && (timestamp > adc_time))
                                     || timestamp == 32'hFFFFFFFF)
           reader_state <= WAITSTROBE;
       // Wait a little bit more
       else if (timestamp > adc_time + `JITTER)
           reader_state <= WAIT;
       // Outdated
       else if (timestamp < adc_time) 
           //skip start of burst, flag later as trash
            begin
                trash <= 1;
                reader_state <= IDLE;
                skip <= 1;
            end
   end