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! This source code file was last time modified by Igor UA3DJY on 20181215
! All changes are shown in the patch file coming together with the full JTDX source code.
program JT65code
! Provides examples of message packing, bit and symbol ordering,
! Reed Solomon encoding, and other necessary details of the JT65
! protocol.
use packjt
character*22 msg,msg0,msg1,decoded,cok*3,bad*1,msgtype*10
integer dgen(12),sent(63),tmp(63),recd(12),era(51)
include 'testmsg.f90'
nargs=iargc()
if(nargs.ne.1) then
print*,'Usage: jt65code "message"'
print*,' jt65code -t'
go to 999
endif
call getarg(1,msg) !Get message from command line
nmsg=1
if(msg(1:2).eq."-t") then
testmsg(NTEST+1)="KA1ABC WB9XYZ EN34 OOO"
testmsg(NTEST+2)="KA1ABC WB9XYZ OOO"
testmsg(NTEST+3)="RO"
testmsg(NTEST+4)="RRR"
testmsg(NTEST+5)="73"
nmsg=NTEST+5
endif
write(*,1010)
1010 format(" Message Decoded Err? Type"/ &
74("-"))
do imsg=1,nmsg
if(nmsg.gt.1) msg=testmsg(imsg)
call fmtmsg(msg,iz) !To upper, collapse mult blanks
msg0=msg !Input message
call chkmsg(msg,cok,nspecial,flip) !See if it includes "OOO" report
msg1=msg !Message without "OOO"
if(nspecial.gt.0) then !or is a shorthand message
if(nspecial.eq.2) decoded="RO"
if(nspecial.eq.3) decoded="RRR"
if(nspecial.eq.4) decoded="73"
itype=-1
msgtype="Shorthand"
go to 10
endif
call packmsg(msg1,dgen,itype) !Pack message into 12 six-bit bytes
msgtype=""
if(itype.eq.1) msgtype="Std Msg"
if(itype.eq.2) msgtype="Type 1 pfx"
if(itype.eq.3) msgtype="Type 1 sfx"
if(itype.eq.4) msgtype="Type 2 pfx"
if(itype.eq.5) msgtype="Type 2 sfx"
if(itype.eq.6) msgtype="Free text"
call rs_encode(dgen,sent) !RS encode
call interleave63(sent,1) !Interleave channel symbols
call graycode(sent,63,1,sent) !Apply Gray code
call graycode(sent,63,-1,tmp) !Remove Gray code
call interleave63(tmp,-1) !Remove interleaving
call rs_decode(tmp,era,0,recd,nerr) !Decode the message
call unpackmsg(recd,decoded) !Unpack the user message
if(cok.eq."OOO") decoded(20:22)=cok
call fmtmsg(decoded,iz)
10 bad=" "
if(decoded.ne.msg0) bad="*"
write(*,1020) imsg,msg0,decoded,bad,itype,msgtype
1020 format(i2,'.',2x,a22,2x,a22,3x,a1,i3,": ",a13)
enddo
if(nmsg.eq.1 .and. nspecial.eq.0) then
write(*,1030) dgen
1030 format(/'Packed message, 6-bit symbols ',12i3) !Display packed symbols
write(*,1040) sent
1040 format(/'Information-carrying channel symbols'/(i5,20i3))
endif
999 end program JT65code
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