VolksForth/8086/msdos/miniterm.fb

\\ Terminalprogramm mit Blockinterface          ( 08.03.91/KK )                                                                  Autor: Klaus Kohl, 30.01.89 aus FG-FORTH des RTX entnommen                                                                                          Beschreibung:                                                                                               Kleines Beispiel  zur Implementation eines Fileinterfaces <20>ber  die serielle Schnittstelle (Achtung: immer 8 Datenbits)                                                                         Die Schnittstellenbefehle  stammen aus dem  PC-volksFORTH 3.81  von Klaus Schleisiek.  Sie wurden weitgehend unver„ndert <20>ber-  nommen, sind aber auf 4KByte-Puffer erweitert.                  File: SERIAL.SCR                                                                                                                Umstellung des  Ports durch  Ausmaskierung der  entsprechenden  Zeilen in Screen 2 (momentan COM1 aktiviert).                  \ LOADSCREEN                                         cas 28jun20                                                                Onlyforth               \ Suchreihenfolge: FORTH  FORTH ONLY    \needs Assembler  2 loadfrom asm.fb     \ Assembler nachladen                                                                     FROM source.img  ( File for SAVESYSTEM )                                                                                        $20 >label I_ctrl             \ 8259-Register                   $21 >label I_mask             \ 8259-Mask                                                                                       &02 &11 THRU  ( SIO-Terminalroutines )                          &12 &17 THRU  ( extended command words )                        &18 LOAD      ( Terminalprogram )                                                                                                                                                                                                                             \ Addresses and Constants                            cas 28jun20                                                                | $C 4 * Constant SINT@         \ SIO-Interuptvector COM 1/3    \ $B 4 * Constant SINT@         \ SIO-Interuptvector COM 2/4    | $10 Constant I_level          \ 8259-Interuptlevel COM 1/3    \ $08 Constant I_level          \ 8259-Interuptlevel COM 2/4    ( Port address)                                                 | $3F8 >label Portadr           \ Portaddress COM1:             \ $2F8 >label Portadr           \ Portaddress COM2:             \ $3E8 >label Portadr           \ Portaddress COM3:             \ $2E8 >label Portadr           \ Portaddress COM4:             ( Selection of Baud rate )                                      \ &96 >label baud               .(  1200 Baud )                 \ &48 >label baud               .(  2400 Baud )                 | &12 >label baud               .(  9600 Baud )                 \ &02 >label baud               .( 57600 Baud )                 \ Queue and required commands                        cas 28jun20                                                                ( Dataqueue with 128 bytes and two pointer for IRQ service )    ( Queue+0: Number of saved characters )                         ( Queue+1: offset to next char to be send )                      Create Queue  0 , 0 ,  $1000 allot                                                                                             \ send byte to port address ( b adr -- )                        \needs pc!   Code pc!  A pop   D byte out   D pop   Next                                                                        \ Read Byte from port address ( adr -- b )                      \needs pc@   Code pc@  D byte in   A- D- mov   D+ D+ xor   Next                                                                                                                                                                                                                                                                 \ tx? = Request status for sending char              cas 28jun20                                                                ( test if a char cn be send )                                     Code tx?      ( -- f )        \ f=-1, ready to send              D push               \ TOS to datastack (TOS=Top Of Stack)      Portadr 5 + # D mov  \ move status address into D reg           D in                 \ get port into register A                 D D xor              \ set D register to 0                      $1020 # A and        \ mask  % 0001 0000 0010 0000              $1020 # A cmp        \ tes if these bits are set                0= ?[  D dec  ]?     \ char output permitted ?                  Next                 \ compiling "Next" wurg macro             end-code                                                                                                                                                                                                                                                      \ (tx  tx  = transmit                                cas 28jun20                                                                ( unconditional send byte directly to 8250-Port )                 Code (tx      ( char -- )                                        D- A- xchg           \ load char into AL-register               Portadr # D mov      \ load port address in D-register          D byte out           \ transmit AL                              D pop                \ load next stack value into D-register    Next                 \ compiling "Next"                        end-code                                                                                                                      ( wait until last char has been send )                            : tx          ( char -- )                                        BEGIN tx? UNTIL      \ wait until SIO ready                     (tx ;                \ now write to port                                                                                     \ -DTR  +DTR  = Data Terminal Ready on/off           cas 28jun20( DTR-Line to +12 V = logical zero )                              Code -DTR     ( -- )                                             D push               \ save TOS                                 Portadr 4 + # D mov  \ get Address of Port Controllregister     D byte in            \ move content to AL register              $1C # A- and         \ DTR and RTS to 0 = +12 V                 D byte out           \ write AL back into port register         D pop                \ restore TOS                              Next                 \ next FORTH words                        end-code                                                      ( set DTR and RTS back to 1 = -12 V )                             Code +DTR     ( -- )                                             D push   Portadr 4 + # D mov                                    D byte in   3 # A- or   D byte out                              D pop   Next    end-code                                     \ receive queue and interrupt service routine   ( 21.02.89/KK )                                                                 | Label S_INT                                                        D push   I push   A push                                        Queue # I mov   C: seg I ) A mov                                A D mov   A inc   $FFF # A and   C: seg A I ) mov   D I ADD     Portadr # D mov   D byte in   C: seg A- 4 I D) mov              $20 # A- mov   I_ctrl #) byte out          \ EOI for 8259       A pop   I pop   D pop   iret                                 end-code                                                                                                                                                                                                                                                                                                                                                                                                                                                      \ rx?  = request status for reading from Queue       cas 28jun20| Code rx?  ( -- f )   D push                                        Queue #) D mov   Queue 2+ #) D XOR                              Next   end-code                                                                                                            \\ Query if a char can be read from the queue                     Code rx?      ( -- f ) ( f<>0, if char ready )                   D push               \ TOS to datastack                         D D xor              \ D-register to 0                          Queue #) D- mov      \ get number if DL and                     D- D- or             \ test for 0                               0= ?[  [[  D push                       \ if queue empty            Portadr 4 + # D mov                 \ activate S8 again         D byte in  $B # A- or   D byte out  \ without changing          D pop                               \ D register         swap ]?  Next   end-code                                        \ (rx  rx  = receive char from queue                 cas 28jun20                                                                ( get char from queue, adjust pointer )                           Code (rx      ( -- char )                                          D push   I push                                                 Queue 2+ # I mov   C: seg I ) A mov                             A D mov   A inc   $FFF # A and   C: seg A I ) mov   D I ADD     C: seg 2 I D) A- mov   0 # A+ mov  A D mov                      I pop   Next   end-code                                                                                                    ( get char, wait for char available )                             : rx          ( -- char )                                        BEGIN rx? UNTIL (rx ;                                                                                                                                                                                                                                        \ S_init  = initialize serial interface              cas 28jun20| Code S_init   ( -- )                                             D push   D: push               \ save TOS and DS register       A A xor   A D: mov   C: A mov            \ 0 -> DS ; CS -> A    SINT@ # W mov   S_INT # W ) mov      \ set IRQ vector           A 2 W D) mov   D: pop            \ and restore DS register      Portadr 3 + # D mov                                             $80 # A- mov   D byte out   \ enable Baud-rate register         2 # D sub  baud # A mov  A- A+ xchg  D byte out   \ set the         D dec                A- A+ xchg  D byte out   \ BAUD rate   3 # D add   $A07 # A mov   D out      \ 8bit, noP, +RTS +OUT    2 # D sub   1 # A- mov   D byte out   \ enable RX IRQ           I_mask #) byte in                                               I_level Forth not Assembler # A- and       \ activate 8259      I_mask #) byte out                                              D pop   Next  end-code                                       \ init  -init   = Initialization / Reset             cas 28jun20                                                                \needs init   | : init ;                                                                                                        ( clear queue pointer and initialize port and interrupt )         : init        ( -- )                                             init   Queue off  Queue 2+ off   S_init ;                                                                                    ( block IRQ, disable RTS and DTR )                                : -init       ( -- )                                             0 [ Portadr 1+ ] Literal  pc!        \ disable 8259 IRQ         0 [ Portadr 4 + ] Literal pc!        \ -RTS/-rts/-out2          I_mask pc@ I_level or I_mask pc! ;   \ block 8259                                                                                                                                                                                                            \ rxto  rxwto  = receive char with timeout           cas 28jun20                                                                | &1000 Constant Timeout        \ exit after 1000 iterations                                                                    ( get a char )                                                  | : rxto        ( -- char 0 | f ) ( f=-1 signals error )           Timeout                              \ number iterations        BEGIN rx? IF drop (rx 0 exit THEN    \ char available?                1- DUP 0=                      \ Timeout ?                UNTIL DROP -1 ;                                                                                                              ( get a word, Highbyte first )                                  | : rxwto       ( -- n 0 | f )                                     rxto ?dup ?exit             \ exit when Timeout in 1st byte     &256 * rxto               \ move to highbyte, get lowbyte       if drop -1 else OR 0 then ;     \ Timeout -> error flag      \ info.  blk>sio  sio>blk  = Forth Block I/O         cas 28jun20: info.         ." Block: " dup . cr ;                          : blk>sio       ( b -- f )      ( Block to target machine )        dup capacity u<                                                 if  cr ." HOST -> TA -" info. block 0 tx                            &1024 0 DO dup c@ tx 1+ LOOP drop                           else drop 9 tx                                                  then 0 ;                                                     : sio>blk       ( b -- f )      ( Block from Target )              dup capacity u<                                                 if   cr ." TA -> HOST -" info. flush block 0 tx                    &1024 0 do rxto if   drop &1234 leave                                           else over c! 1+       then loop &1234 =         if empty-buffers -1 else update flush 0 then                 else drop 9 tx 0 then ;                                                                                                      \ Extension for img>file                             cas 28jun20                                                                VARIABLE TSEG  TSEG OFF      ( Segment-Address of Target-RAM )                                                                  : TINIT         ( len -- )                                         0 B/SEG UM/MOD SWAP IF 1+ THEN   ( number of blocks )           LALLOCATE ABORT" No RAM"         ( reserve )                    TSEG ! ;                         ( save address )            : TFREE         ( -- )              ( release memory )             TSEG @ LFREE ABORT" RAM allocated" ;                                                                                         : TC!           ( c addr -- )   ( write byte )                     TSEG @ SWAP LC! ;                                            : <TMOVE        ( taddr addr n -- ) ( data from target )           >R >R TSEG @ SWAP DS@ R> R> LMOVE ;                                                                                          \ Terminal part for SAVESYSTEM                       cas 28jun20                                                                : img>file      ( len -- f )    ( save image file )                DUP TINIT   DUP 0   0 tx                                        ?DO  rxto ABORT" Savesystem-Error"  I TC!  LOOP                 PUSHFILE  SOURCE.IMG                                            CAPACITY 1-  0  DO I BLOCK &1024 -1 FILL UPDATE LOOP            0 $400 UM/MOD   DUP 0                                           ?DO  I $400 *  I BLOCK   $400 <TMOVE  UPDATE  LOOP              SWAP ?DUP                                                       IF   OVER  DUP $400 *  SWAP BLOCK  ROT <TMOVE  UPDATE  THEN     DROP FLUSH CLOSE                                                TFREE  0 ;                                                                                                                                                                                                                                                   \ tbu  = command interpreter                         cas 28jun20                                                                ( command interpreter for escape codes )                        | : tbu         ( -- f ) ( Terminal block transmission )           rxto ?dup ?exit                                 \ get code        1 case? if rxwto ?dup ?exit blk>sio exit then    \ Transmit     2 case? if rxwto ?dup ?exit sio>blk exit then    \ Receive      3 case? if rxwto ?dup ?exit img>file exit then       \ ROM      4 case? if rxwto ?dup ?exit drop page 0 exit then   \ PAGE      5 case? if rxto ?dup ?exit rxto ?dup if nip exit then                      swap at                0 exit then         \ AT    $1B case? if $1B tx                 0 exit then     \ ESCAPE    drop -1 ;                    \ error unknown command                                                                                                                                                                                                         \ ?rx  = char from terminal                          cas 28jun20                                                                ( receive and interpret char )                                  | : ?rx         ( -- )                                             pause rx? 0=exit (rx          \ return if no char wainting      dup $20 u<                          \ is control char?          if                                                                $1B case? if tbu abort" Command-Error" exit THEN  \ ESCAPE      #LF case? IF cr        exit THEN                    \ CRLF      #CR case? IF Row 0 at  exit THEN               \ only CR        #BS case? IF del       exit THEN               \ Backspace      drop                               \ better ignore these      else                                                              Col &78 u> if cr then                    \ next line?           emit                   \ directly emit char                   then ;                                                       \ T - Main Terminal command                          cas 28jun20                                                                ( send char if possible )                                       | : ?tx         ( c -- )                                           BEGIN ?rx tx? UNTIL          \ receive unil SIO is free         tx ;                                 \ then transmit         ( Terminal Interpreter Loop )                                   | : (T          ( -- )                                             BEGIN BEGIN  ?rx key?  UNTIL   \ receive until key pressed            key    $1B case? IF -DTR exit THEN ?tx  \ exit on ESC     REPEAT ;                                                     ( Main program, en-/disables interrupt )                          : T           ( -- )                                             CR ." TA-Terminal (Exit with ESC)" CR                           INIT   (T   -INIT                                               CR ." VolksForth " ;