subroutine recvpkt(iarg) ! Receive timf2 packets from Linrad and stuff data into array id(). ! (This routine runs in a background thread and will never return.) parameter (NSZ=2*60*96000) real*8 d8(NSZ) integer*1 userx_no,iusb integer*2 nblock,nblock0 logical synced real*8 center_freq,buf8 common/plrscom/center_freq,msec,fqso,iptr,nblock,userx_no,iusb,buf8(174) include 'datcom.f90' include 'gcom1.f90' include 'gcom2.f90' equivalence (id,d8) data nblock0/0/,kb/1/,nw/0/,ns0/99/ data sqave/0.0/,u/0.001/,rxnoise/0.0/,kbuf/1/,lost_tot/0/ data multicast0/-99/ save 1 call setup_rsocket(multicast) !Open socket for multicast/unicast data k=0 kk=0 kxp=0 kb=1 nsec0=-999 fcenter=144.125 !Default (startup) frequency) multicast0=multicast ntx=0 synced=.false. 10 if(multicast.ne.multicast0) go to 1 call recv_pkt(center_freq) ! Should receive a new packet every 174/96000 = 0.0018125 s nsec=mod(Tsec,86400.d0) !Time according to MAP65 nseclr=msec/1000 !Time according to Linrad fcenter=center_freq ! Reset buffer pointers at start of minute. ns=mod(nsec,60) if(ns.lt.ns0 .and. (lauto+monitoring.ne.0)) then if(ntx.eq.0) kb=3-kb k=(kb-1)*60*96000 ndone1=0 ndone2=0 ntx=0 lost_tot=0 kxp=k synced=.true. endif ns0=ns if(transmitting.eq.1) ntx=1 ! Check for lost packets lost=nblock-nblock0-1 if(lost.ne.0) then nb=nblock if(nb.lt.0) nb=nb+65536 nb0=nblock0 if(nb0.lt.0) nb0=nb0+65536 lost_tot=lost_tot + lost ! Insert zeros for the lost data. do i=1,174*lost k=k+1 d8(k)=0 enddo endif nblock0=nblock tdiff=mod(0.001d0*msec,60.d0)-mod(Tsec,60.d0) if(tdiff.lt.-30.) tdiff=tdiff+60. if(tdiff.gt.30.) tdiff=tdiff-60. ! Test for buffer full if((kb.eq.1 .and. (k+174).gt.NSMAX) .or. & (kb.eq.2 .and. (k+174).gt.2*NSMAX)) go to 20 ! Move data into Rx buffer and compute average signal level. sq=0. do i=1,174 k=k+1 d8(k)=buf8(i) k2=k n=1 if(k.gt.NSMAX) then k2=k2-NSMAX n=2 endif x1=id(1,k2,n) x2=id(2,k2,n) x3=id(3,k2,n) x4=id(4,k2,n) sq=sq + x1*x1 + x2*x2 + x3*x3 + x4*x4 enddo sqave=sqave + u*(sq-sqave) rxnoise=10.0*log10(sqave) - 48.0 kxp=k 20 if(nsec.ne.nsec0) then nsec0=nsec mutch=nseclr/3600 mutcm=mod(nseclr/60,60) mutc=100*mutch + mutcm ! If we have not transmitted in this minute, see if it's time to start FFTs if(ntx.eq.0 .and. lauto+monitoring.ne.0) then if(ns.ge.nt1 .and. ndone1.eq.0 .and. synced) then nutc=mutc fcenter=center_freq kbuf=kb kk=k ndiskdat=0 ndone1=1 endif ! See if it's time to start the full decoding procedure. nhsym=(k-(kbuf-1)*60*96000)/17832.9252 if(ndone1.eq.1 .and. nhsym.ge.279 .and.ndone2.eq.0) then kk=k nlost=lost_tot ! Save stats for printout ndone2=1 endif endif ! if(ns.le.5 .or. ns.ge.46) write(*,3001) ns,ndone1,kb, & ! kbuf,ntx,kk,tdiff !3001 format(5i4,i11,f8.2) endif go to 10 end subroutine recvpkt