2017-04-22 12:40:44 +00:00
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program JT65code
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! Provides examples of message packing, bit and symbol ordering,
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! Reed Solomon encoding, and other necessary details of the JT65
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! protocol.
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use packjt
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character*22 msg,msgchk,msg0,msg1,decoded,cok*3,bad*1,msgtype*10,expected
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integer dgen(12),sent(63),tmp(63),recd(12),era(51)
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include 'testmsg.f90'
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nargs=iargc()
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if(nargs.ne.1) then
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print*,'Usage: jt65code "message"'
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print*,' jt65code -t'
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go to 999
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endif
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call getarg(1,msg) !Get message from command line
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msgchk=msg
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call fmtmsg(msgchk,iz)
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nmsg=1
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if(msg(1:2).eq."-t") then
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if (NTEST+5 > MAXTEST) then
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write(*,*) "NTEST exceed MAXTEST"
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endif
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testmsg(NTEST+1)="KA1ABC WB9XYZ EN34 OOO"
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testmsg(NTEST+2)="KA1ABC WB9XYZ OOO"
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testmsg(NTEST+3)="RO"
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testmsg(NTEST+4)="RRR"
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testmsg(NTEST+5)="73"
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testmsgchk(NTEST+1)="KA1ABC WB9XYZ EN34 OOO"
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testmsgchk(NTEST+2)="KA1ABC WB9XYZ OOO"
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testmsgchk(NTEST+3)="RO"
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testmsgchk(NTEST+4)="RRR"
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testmsgchk(NTEST+5)="73"
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nmsg=NTEST+5
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endif
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write(*,1010)
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1010 format(" Message Decoded Err? Type Expected"/ &
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76("-"))
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do imsg=1,nmsg
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if(nmsg.gt.1) then
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msg=testmsg(imsg)
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msgchk=testmsgchk(imsg)
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endif
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call fmtmsg(msg,iz) !To upper, collapse mult blanks
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msg0=msg !Input message
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call chkmsg(msg,cok,nspecial,flip) !See if it includes "OOO" report
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msg1=msg !Message without "OOO"
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if(nspecial.gt.0) then !or is a shorthand message
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if(nspecial.eq.2) decoded="RO"
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if(nspecial.eq.3) decoded="RRR"
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if(nspecial.eq.4) decoded="73"
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itype=-1
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msgtype="Shorthand"
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go to 10
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endif
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2018-07-10 15:09:42 -04:00
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call packmsg(msg1,dgen,itype) !Pack message into 12 six-bit bytes
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2017-04-22 12:40:44 +00:00
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msgtype=""
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if(itype.eq.1) msgtype="Std Msg"
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if(itype.eq.2) msgtype="Type 1 pfx"
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if(itype.eq.3) msgtype="Type 1 sfx"
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if(itype.eq.4) msgtype="Type 2 pfx"
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if(itype.eq.5) msgtype="Type 2 sfx"
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if(itype.eq.6) msgtype="Free text"
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call rs_encode(dgen,sent) !RS encode
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call interleave63(sent,1) !Interleave channel symbols
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call graycode(sent,63,1,sent) !Apply Gray code
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call graycode(sent,63,-1,tmp) !Remove Gray code
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call interleave63(tmp,-1) !Remove interleaving
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call rs_decode(tmp,era,0,recd,nerr) !Decode the message
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2018-07-11 10:13:42 -04:00
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call unpackmsg(recd,decoded) !Unpack the user message
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2017-04-22 12:40:44 +00:00
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if(cok.eq."OOO") decoded(20:22)=cok
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call fmtmsg(decoded,iz)
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10 bad=" "
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expected = 'EXACT'
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2018-08-31 11:22:06 -04:00
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if(decoded.ne.msg0) then
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bad="*"
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if(decoded(1:13).eq.msg0(1:13) .and. &
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decoded(14:22).eq. ' ') expected = 'TRUNCATED'
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endif
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2017-04-22 12:40:44 +00:00
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write(*,1020) imsg,msg0,decoded,bad,itype,msgtype,expected
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1020 format(i2,'.',1x,a22,1x,a22,1x,a1,i3,":",a10,2x,a22)
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enddo
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if(nmsg.eq.1 .and. nspecial.eq.0) then
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write(*,1030) dgen
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1030 format(/'Packed message, 6-bit symbols ',12i3) !Display packed symbols
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write(*,1040) sent
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1040 format(/'Information-carrying channel symbols'/(i5,20i3))
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endif
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999 end program JT65code
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