mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-13 23:51:49 -05:00
102 lines
3.5 KiB
Fortran
102 lines
3.5 KiB
Fortran
program ft4code
|
|
|
|
! Provides examples of message packing, LDPC(174,91) encoding, bit and
|
|
! symbol ordering, and other details of the FT8 protocol.
|
|
|
|
use packjt77
|
|
include 'ft4_params.f90' !Set various constants
|
|
include 'ft4_testmsg.f90'
|
|
parameter (NWAVE=NN*NSPS)
|
|
|
|
character*37 msg,msgsent
|
|
character*77 c77
|
|
character*9 comment
|
|
character bad*1,msgtype*18
|
|
integer itone(NN)
|
|
integer*1 msgbits(77),rvec(77),codeword(174)
|
|
data rvec/0,1,0,0,1,0,1,0,0,1,0,1,1,1,1,0,1,0,0,0,1,0,0,1,1,0,1,1,0, &
|
|
1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,1,1,1,0,0,1,0,1, &
|
|
0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
|
|
|
|
! Get command-line argument(s)
|
|
nargs=iargc()
|
|
if(nargs.ne.1 .and. nargs.ne.3) then
|
|
print*
|
|
print*,'Program ft4code: Provides examples of message packing, ', &
|
|
'LDPC(174,91) encoding,'
|
|
print*,'bit and symbol ordering, and other details of the FT4 protocol.'
|
|
print*
|
|
print*,'Usage: ft4code [-c grid] "message" # Results for specified message'
|
|
print*,' ft4code -t # Examples of all message types'
|
|
go to 999
|
|
endif
|
|
|
|
call getarg(1,msg) !Message to be transmitted
|
|
if(len(trim(msg)).eq.2 .and. msg(1:2).eq.'-t') then
|
|
nmsg=NTEST
|
|
else
|
|
call fmtmsg(msg,iz) !To upper case; collapse multiple blanks
|
|
nmsg=1
|
|
endif
|
|
|
|
write(*,1010)
|
|
1010 format(4x,'Message',31x,'Decoded',29x,'Err i3.n3'/100('-'))
|
|
|
|
do imsg=1,nmsg
|
|
if(nmsg.gt.1) msg=testmsg(imsg)
|
|
|
|
! Generate msgsent, msgbits, and itone
|
|
i3=-1
|
|
n3=-1
|
|
call pack77(msg,i3,n3,c77)
|
|
call genft4(msg,0,msgsent,msgbits,itone)
|
|
call encode174_91(msgbits,codeword)
|
|
msgtype=""
|
|
if(i3.eq.0) then
|
|
if(n3.eq.0) msgtype="Free text"
|
|
if(n3.eq.1) msgtype="DXpedition mode"
|
|
if(n3.eq.2) msgtype="EU VHF Contest"
|
|
if(n3.eq.3) msgtype="ARRL Field Day"
|
|
if(n3.eq.4) msgtype="ARRL Field Day"
|
|
if(n3.eq.5) msgtype="Telemetry"
|
|
if(n3.ge.6) msgtype="Undefined type"
|
|
endif
|
|
if(i3.eq.1) msgtype="Standard msg"
|
|
if(i3.eq.2) msgtype="EU VHF Contest"
|
|
if(i3.eq.3) msgtype="ARRL RTTY Roundup"
|
|
if(i3.eq.4) msgtype="Nonstandard calls"
|
|
if(i3.ge.5) msgtype="Undefined msg type"
|
|
if(i3.ge.1) n3=-1
|
|
bad=" "
|
|
comment=' '
|
|
if(msg.ne.msgsent) bad="*"
|
|
if(n3.ge.0) then
|
|
write(*,1020) imsg,msg,msgsent,bad,i3,n3,msgtype,comment
|
|
1020 format(i2,'.',1x,a37,1x,a37,1x,a1,2x,i1,'.',i1,1x,a18,1x,a9)
|
|
else
|
|
write(*,1022) imsg,msg,msgsent,bad,i3,msgtype,comment
|
|
1022 format(i2,'.',1x,a37,1x,a37,1x,a1,2x,i1,'.',1x,1x,a18,1x,a9)
|
|
endif
|
|
enddo
|
|
|
|
if(nmsg.eq.1) then
|
|
write(*,1030) ieor(msgbits,rvec)
|
|
1030 format(/'Source-encoded message before scrambling, 77 bits: ',/77i1)
|
|
write(*,1032) rvec
|
|
1032 format(/'Scrambling vector, 77 bits: ',/77i1)
|
|
write(*,1034) msgbits
|
|
1034 format(/'Source-encoded message after scrambling, 77 bits:'/77i1)
|
|
write(*,1036) codeword(78:91)
|
|
1036 format(/'14-bit CRC: ',/14i1)
|
|
write(*,1038) codeword(92:174)
|
|
1038 format(/'83 Parity bits: ',/83i1)
|
|
write(*,1040) 0,itone,0
|
|
1040 format(/'Channel symbols (105 tones):'/ &
|
|
'R Sync',13x,'Data',13x, &
|
|
' Sync',13x,'Data',13x, &
|
|
' Sync',13x,'Data',13x,' Sync R'/ &
|
|
i1,1x,4i1,1x,29i1,1x,4i1,1x,29i1,1x,4i1,1x,29i1,1x,4i1,i2)
|
|
endif
|
|
|
|
999 end program ft4code
|