mirror of https://github.com/saitohirga/WSJT-X.git
48 lines
1.5 KiB
Fortran
48 lines
1.5 KiB
Fortran
program JT65code
|
|
|
|
! Provides examples of message packing, bit and symbol ordering,
|
|
! Reed Solomon encoding, and other necessary details of the JT65
|
|
! protocol.
|
|
|
|
character*22 msg0,msg,decoded,cok*3
|
|
integer dgen(12),sent(63),recd(12),era(51)
|
|
|
|
nargs=iargc()
|
|
if(nargs.ne.1) then
|
|
print*,'Usage: JT65code "message"'
|
|
go to 999
|
|
endif
|
|
|
|
call getarg(1,msg0) !Get message from command line
|
|
msg=msg0
|
|
|
|
call chkmsg(msg,cok,nspecial,flip) !See if it includes "OOO" report
|
|
if(nspecial.gt.0) then !or is a shorthand message
|
|
write(*,1010)
|
|
1010 format('Shorthand message.')
|
|
go to 999
|
|
endif
|
|
|
|
call packmsg(msg,dgen) !Pack message into 72 bits
|
|
write(*,1020) msg0
|
|
1020 format('Message: ',a22) !Echo input message
|
|
if(iand(dgen(10),8).ne.0) write(*,1030) !Is plain text bit set?
|
|
1030 format('Plain text.')
|
|
write(*,1040) dgen
|
|
1040 format('Packed message, 6-bit symbols: ',12i3) !Display packed symbols
|
|
|
|
call rs_encode(dgen,sent) !RS encode
|
|
call interleave63(sent,1) !Interleave channel symbols
|
|
call graycode(sent,63,1) !Apply Gray code
|
|
write(*,1050) sent
|
|
1050 format('Channel symbols, including FEC:'/(i5,20i3))
|
|
|
|
call graycode(sent,63,-1)
|
|
call interleave63(sent,-1)
|
|
call rs_decode(sent,era,0,recd,nerr)
|
|
call unpackmsg(recd,decoded) !Unpack the user message
|
|
write(*,1060) decoded,cok
|
|
1060 format('Decoded message: ',a22,2x,a3)
|
|
|
|
999 end program JT65code
|