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112 lines
2.8 KiB
Fortran
112 lines
2.8 KiB
Fortran
subroutine genfst4(msg0,ichk,msgsent,msgbits,i4tone,iwspr)
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! Input:
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! - msg0 requested message to be transmitted
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! - ichk if ichk=1, return only msgsent
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! - msgsent message as it will be decoded
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! - i4tone array of audio tone values, {0,1,2,3}
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! - iwspr in: 0: FST4 1: FST4W
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! out 0: (240,101)/crc24, 1: (240,74)/crc24
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!
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! Frame structure:
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! s8 d30 s8 d30 s8 d30 s8 d30 s8
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use packjt77
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include 'fst4_params.f90'
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character*37 msg0
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character*37 message !Message to be generated
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character*37 msgsent !Message as it will be received
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character*77 c77
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character*24 c24
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integer*4 i4tone(NN),itmp(ND)
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integer*1 codeword(2*ND)
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integer*1 msgbits(101),rvec(77)
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integer isyncword1(8),isyncword2(8)
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integer ncrc24
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logical unpk77_success
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data isyncword1/0,1,3,2,1,0,2,3/
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data isyncword2/2,3,1,0,3,2,0,1/
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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, &
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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, &
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0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
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message=msg0
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do i=1, 37
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if(ichar(message(i:i)).eq.0) then
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message(i:37)=' '
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exit
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endif
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enddo
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do i=1,37 !Strip leading blanks
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if(message(1:1).ne.' ') exit
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message=message(i+1:)
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enddo
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i3=-1
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n3=-1
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if(iwspr.eq.1) then
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i3=0
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n3=6
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endif
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call pack77(message,i3,n3,c77)
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call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
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msgbits=0
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iwspr=0
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if(i3.eq.0.and.n3.eq.6) then
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iwspr=1
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read(c77,'(50i1)') msgbits(1:50)
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call get_crc24(msgbits,74,ncrc24)
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write(c24,'(b24.24)') ncrc24
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read(c24,'(24i1)') msgbits(51:74)
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else
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read(c77,'(77i1)') msgbits(1:77)
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msgbits(1:77)=mod(msgbits(1:77)+rvec,2)
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call get_crc24(msgbits,101,ncrc24)
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write(c24,'(b24.24)') ncrc24
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read(c24,'(24i1)') msgbits(78:101)
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endif
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if(ichk.eq.1) go to 999
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if(unpk77_success) go to 2
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msgbits=0
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itone=0
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msgsent='*** bad message *** '
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go to 999
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entry get_fst4_tones_from_bits(msgbits,i4tone,iwspr)
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2 continue
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if(iwspr.eq.0) then
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call encode240_101(msgbits,codeword)
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else
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call encode240_74(msgbits(1:74),codeword)
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endif
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! Grayscale mapping:
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! bits tone
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! 00 0
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! 01 1
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! 11 2
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! 10 3
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do i=1,ND
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is=codeword(2*i)+2*codeword(2*i-1)
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if(is.le.1) itmp(i)=is
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if(is.eq.2) itmp(i)=3
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if(is.eq.3) itmp(i)=2
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enddo
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i4tone( 1: 8)=isyncword1
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i4tone( 9: 38)=itmp( 1: 30)
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i4tone( 39: 46)=isyncword2
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i4tone( 47: 76)=itmp( 31: 60)
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i4tone( 77: 84)=isyncword1
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i4tone( 85:114)=itmp( 61: 90)
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i4tone(115:122)=isyncword2
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i4tone(123:152)=itmp( 91:120)
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i4tone(153:160)=isyncword1
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999 return
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end subroutine genfst4
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