mirror of https://github.com/saitohirga/WSJT-X.git
110 lines
2.7 KiB
Fortran
110 lines
2.7 KiB
Fortran
subroutine genfst280(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 0: (280,101)/crc24, 1: (280,74)/crc24
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!
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! Frame structure:
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! s8 d70 s8 d70 s8
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! Message duration: TxT = 164*8400/12000 = 114.8 s
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use packjt77
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include 'fst280_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 isyncword(8)
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integer ncrc24
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logical unpk77_success
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data isyncword/0,1,3,2,1,0,2,3/
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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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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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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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1 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_fst280_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 encode280_101(msgbits,codeword)
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else
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call encode280_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(1:7)=itmp(1:7)
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i4tone(8:14)=itmp(15:21)
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i4tone(15:35)=itmp(29:49)
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i4tone(36:43)=isyncword
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i4tone(44:78)=itmp(50:84)
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i4tone(79:86)=isyncword
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i4tone(87:121)=itmp(85:119)
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i4tone(122:129)=isyncword
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i4tone(130:150)=itmp(120:140)
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i4tone(151:157)=itmp(22:28)
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i4tone(158:164)=itmp(8:14)
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999 return
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end subroutine genfst280
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