WSJT-X/recvpkt.F90

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3.3 KiB
Fortran
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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/,npkt/0/,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
npkt=npkt+1
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) then
if(ntx.eq.0) kb=3-kb
k=(kb-1)*60*96000
ndone1=0
ntx=0
lost_tot=0
kxp=k
npkt=0
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) 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 second stage of processing
if(ndone1.eq.1 .and. ns.ge.nt2) then
kk=k
nlost=lost_tot ! Save stats for printout
endif
endif
tt=npkt*174.0/96000.0
! if(ns.le.5 .or. ns.ge.46) write(*,3001) ns,ndone1,kb, &
! kbuf,ntx,kk,tdiff,tt
!3001 format(5i4,i11,2f8.2)
endif
go to 10
end subroutine recvpkt