Power Programming/powerprogramming1994.iso/progtool/modem/glassmdm.asm

Assembly Source File | 1986-07-15 | 18KB | 803 lines

    title    glassmodem.asm Glass TTY routine for IBM VCAPI
    Page    60,132
;
;    This ain't beautiful code. It just evolved this way.
;    I could have spent more time cleaning things up.
;    It should be useful as a guide as to how to call the
;    IBM Voice Communication Application Program Interface.
;    This has only been tested with Microsoft MASM 4.0
;
;    The program takes the number to be dialed from the command
;    line. What ever garbage you put on the command line will be
;    fed to the dial routine.
;
;    Control break exits
;    F10 prints error summary there are more errors than their ought to be!
;    It is left as an exercise to the reader to make F9 send a break
;
;    There are two modules in this file  the last one is called ERR.
;    It should be assembled seperately.
;    Use the following to link these files:
;
;    link glasmode+err/dosseg,glasmode,glasmode/map;
;
;    Note the /dosseg flag this puts the zzrom segment last in
;    memory. There is probably some way to get the last memory from
;    the prefix header, but that has always been an unfathomable mystery
;    to me.

    include    veqts.asm
sseg    segment    para    stack
    db    100 dup('STACK')
sseg    ends
zzrom    segment     public 'dseg'
zzrom    ends
;
code    segment    para public 'code'
    assume    cs:code,ss:sseg,ds:dyseg,es:dyseg
    extrn    uerr:near    ;Load code to print string
    extrn    nout:near    ;print number in decimal
    extrn    hout:near    ;print byte in hex
    extrn    perr:near    ;writes dos error code
    extrn    getlast:near    ;gets last location loaded in memory
    public    main
main    proc    far
    mov    ax,es        ;shrink allocated memory
    mov    bx,zzrom    ;IBM resident code does dynamic memory
    sub    bx,ax        ;allocation so we must give it back first
    call    getlast        ;so some is available
    add    bx,ax
    mov    ah,4ah
    int    dos
    jnc    dispok
    jmp    hbye        ;Thats all folks
dispok:    lea    bx,dyseglen    ;Length in bytes of dynamic memory
    push    ds        ;save prefix
    call    getmemory    ;gets dynamic memory
    jnc    memok
    jmp    hbye
memok:    pop    ax
    mov    prefix,ax    ;prefix segment needed later
    xor    ax,ax        ;zero modem error counts
    mov    framec,ax
    mov    parityc,ax
    mov    overunc,ax
;
;    open VCAPI
;
    mov    ax,255        ;wierd return code
    mov    ret,ax        ;if unchanged there is no card
    mov    ah,11h        ;VCAPI id
    mov    al,open        ;function code for open
    mov    dx,21fh        ;Card I/O address
    lea    bx,plist    ;Address of parameter list
;
; note DS register will be used by interrupt routines
;
    int    14h            ;invoke open
    or    ax,ax            ;IBM could save a lot by using cc
    je    openok            ;Continue if no error
    mov    ax,ret            ;perhaps not installed
    cmp    ax,255
    jne    operr
    mov    ax,2            ;Tell world vcapi not installed
    call    uerr
    jmp    hbye
operr:    mov    bx,open            ;Let world know what we were doing
    jmp    errcod
openok:    lea    bx,parms        ;bx always points to parameter list
chkerr    =    1            ;print errors if they happen

;
;grab hardware we need
;
    stuf2    claimhdw,rcb,bid,port1+line1+part1+part2+telephone,0,claimok
;
;connect function to port
;
claimok:
    stuf2    connftop,cid1,bid,port1,telephony,cftpok
;
;see if we can load modem in part 2
;
cftpok:
    stuf2    connftop,cid2,bid,port1,amodem,cftpok2
;
;read modem configuration values
;
cftpok2:
    stuf    rconfig,cid2,cid2,rcok
;
;set new modem config values
;
rcok:
    mov    [bx].rate,12        ;set baud 1200
    mov    [bx].length,8        ;8 bit bytes
    mov    [bx].parity,0        ;no parity

;
;set these new values
;
    stuf    cconfig,cid2,cid2,stok
;
;connect devices to port
;
stok:    stuf2    conndtop,rcb,bid,port1,line1,cdtpok
;
;disconnect line 1
;
cdtpok:
    stuf1    dcondevs,rcb,bid,line1,disconok
;
;set up interrupt for bid with special macro
;
disconok:stuf3s    estint,rcb,bid,comdcomplet,1,baseint,bestiok
;
;    allow command complete interrupt to work
;
bestiok:mov    ax,comdcomplet
    call    benaints
;
;    pick up the phone
;
    stuf1    offhook,rcb,bid,1,offhok ;Note equate for line1 is 10h not 1
offhok:    mov    ax,50            ;Wait 5 seconds
    call    wait
    jnc    offok
offok:    mov    ret,0
;
;link interrupts to interrupt routine
;
    stuf3s    estint,cid1,cid1,readcallprogc+dialcomplete,1,cid1int,esti1ok
esti1ok:mov    ax,readcallprogc+dialcomplete
    mov    dx,cid1
    call    cenaints
;
;    see whether we got a dial tone
;
    stuf4    readcall,cid1,cid1,70,70,0,0,rdok
rdok:    mov    ax,100            ;wait 10 seconds
    call    wait
    jnc    rdcok
    mov    ax,5            ;Tell world we timed out
    call    uerr
    jmp    hbye
rdcok:    cmp    [bx].subints2,dialtone
    jz    gotdt
    mov    ax,6
    call    uerr
    jmp    hbye
gotdt:    lea    di,[bx].w2
    mov    ds,prefix
    mov    al,byte ptr ds:80h ;count of characters on command line
    mov    si,81h        ;point to characters on command line
    and    ax,0fh        ;Only allow 15 characters
    mov    cx,ax
    rep    movsb
    mov    al,':'
    stosb
    push    es
    pop    ds        ;restore dynamic segment
    mov    ax,1100h+dial        ;dial the number
    mov    dx,cid1
    mov    [bx].w1,dx
    int    14h
    or    ax,ax            ;test return code
    jz    dialok
    mov    bx,dial
    jmp    errcod
dialok:    mov    ax,200
    call    wait
    jnc    dialdone
    mov    ax,5            ;Tell world we timed out
    call    uerr
    jmp    hbye
;
;    see what we got at other end of phone
;    this part of the code is weak and doesn't work for all
;    phones. A bit of fiddeling with parameters and a more intelligent
;    retry mechanism would be nice. Also if a person answers the phone
;    it would be polite to give the operator a chance to pick up the
;    phone so they could talk.
;
dialdone:stuf4    readcall,cid1,cid1,70,70,0,0,rdok2
rdok2:    mov    ax,100            ;wait 10 seconds (more than 7 sec!)
    call    wait
    jnc    rdcdok
    mov    ax,5            ;Tell world we timed out
    call    uerr
    jmp    hbye
rdcdok:    cmp    [bx].subints2,carrier
    jz    gotcar
    cmp    [bx].subints2,ringback
    jnz    wrdans
    mov    ax,9            ;tell em it is ringing
    call    uerr
    mov    ah,06            ;check console
    mov    dl,0ffh
    int    dos
    lea    bx,parms        ;dos clobbered this
    jz    rdok2            ;wait for another ring
    jmp    hbye
wrdans:    cmp    [bx].subints2,busy
    jz    gotbus
    cmp    [bx].subints2,fastbusy
    jnz    whtnxt
gotbus:    mov    ax,10
    call    uerr            ;announce phone is busy
    jmp    hbye
;
;    we could ask user to pick up phone to see if we got a person
;    or something but we are just interested in a carrier
;
whtnxt:    mov    ax,7
    call    uerr
    jmp    hbye
gotcar:    mov    ax,8
    call    uerr
    lea    ax,cbuff        ;initialise circular pointers
    mov    tailptr,ax
    mov    headptr,ax
;
;    hook up to interrupt routine for incomming characters
;
    stuf3s    estint,cid2,cid2,dataready,1,rcvint,esti2ok
esti2ok:
;
;hook up routine to count errors
;
    stuf3s    estint,cid2,cid2,linerr,1,errint,esti3ok
esti3ok:
    mov    ax,lnkstatus
    mov    dx,cid2            ;for this cid
    call    cenaints
;
;    start modem going
;
    stuf    start,cid2,cid2,strtok
strtok:    stuf    readstat,cid2,cid2,chkints
chkints:mov    ax,[bx].ints
    test    ax,lnkstatus
    jz    strtok
    mov    ax,[bx].subints1    ;these bits tell if modem started OK
    and    ax,0f0h
    jz    watup
    mov    ax,11
    call    uerr
    jmp    hbye
watup:    mov    ax,0fh            ;enable all interrupts
    mov    dx,cid2            ;for this cid
    call    cenaints
;
;    here is main glasstty loop
;
    public    sndok
sndok:    MOV    AH,1        ; CHARACTER TYPED?
    INT    16H        ; BIOS KBD
    JZ    NOKEY        ; JUMP IF NOT
    MOV    AH,0        ; READ CHAR TYPED
    INT    16H        ; BIOS KBD
    OR    AX,AX        ; CONTROL BREAK?
    jnz    gotkey
    jmp    hbye        ;punt
gotkey:    cmp    ax,4400h    ;F10?
    jne    not_f10        ;Jump if not
    jmp    prtsum        ;print error summary for f10
not_f10:and    ax,7fh
    push    ax
watup3:    stuf    readstat,cid2,cid2,tstup2
tstup2:    mov    ax,[bx].state
    test    ax,modemstrt+statxmitrdy
    jz    watup3
    pop    ax
    mov    [bx].w2,ax    ;character to be sent
    stuf    send,cid2,cid2,sndok
;
;no fall through here
;
nokey:    mov    si,headptr    ;see if anything is in circular buffer
    cmp    si,tailptr
    jnz    carin
    jmp    sndok
carin:    lodsb
    cmp    si,offset bufend
    jnz    nowrap
    lea    si,cbuff
nowrap:    mov    headptr,si
    MOV    AH,14        ; WRITE TTY
    INT    10H        ; BIOS VIDEO
    jmp    sndok
;
;    print error summary
;
prtsum:    mov    ax,parityc
    or    ax,ax
    jz    noparer
    call    nout
    mov    ax,12
    call    uerr
noparer:mov    ax,framec
    or    ax,ax
    jz    noframer
    call    nout
    mov    ax,13
    call    uerr
noframer:mov    ax,overunc
    or    ax,ax
    jz    noverun
    call    nout
    mov    ax,14
    call    uerr
noverun:add    ax,framec    ;Were there any errors?
    add    ax,parityc
    jnz    diderr
    mov    ax,15        ;tell em no errors
    call    uerr
diderr:    jmp    sndok        ; control break exits

main    endp
;
;    interrupt routine for incomming character
;
rcvint    proc    far
    push    ds
    pop    es        ;IBM wasn't good enough to do this for us
chkerr    =    0        ;don't print errors from int code
    lea    bx,iparms    ;int code gets own copy of parm area
    stuf    receive,cid2,cid2,yepchr
yepchr:    mov    ax,[bx].w2        ;here be character
    mov    di,tailptr
    and    al,07fh
    stosb
    cmp    di,offset bufend ;stuff incomming char in circular buffer
    jnz    notwrap
    lea    di,cbuff
notwrap:mov    tailptr,di
    ret
chkerr    =    1            ;print errors if they happen

rcvint    endp
;
;    interrupt routine for base function complete
;
baseint    proc    far
    public    baseint
    mov    dx,bid
    mov    ax,rcb            ;do real simple setup for
rdstx:    lea    bx,parms        ;readstat command
    mov    [bx].w1,ax
    mov    ax,1100h+readstat
    push    ds
    pop    es            ;IBM doesn't restore es!!
    int    14h
;
;If this fails we are dead anyway so don't bother checking
;
    mov    ret,1            ;signal foreground something happened
    ret
baseint    endp
;
;    interrupt routine for cid1 interrupts is just as simple
;
cid1int    proc
    public    cid1int
    mov    ax,cid1
    mov    dx,ax
    jmp    rdstx
cid1int    endp
;
;    errint    adds one to the error count for what ever is ailing us
;
errint    proc    far
    public    errint
    push    ds
    pop    es        ;IBM wasn't good enough to do this for us
chkerr    =    0        ;don't print errors from int code
    lea    bx,iparms    ;int code gets own copy of parm area
    stuf    readstat,cid2,cid2,cnters
cnters:    mov    ax,[bx].subints1
    test    al,1
    jz    tstpar
    inc    overunc
tstpar:    test    al,2
    jz    tstfrm
    inc    parityc
tstfrm:    test    al,4
    jz    nofrm
    inc    framec
nofrm:    ret
errint    endp
;
;    print message saying this is vcapi return code presumably uerr
;    was called so the user is informed as to which call failed
;    error code passed as 16 bits in AX command code in BL
;
errcod    proc    near
    push    ax        ;save error code
    push    bx
    mov    ax,-3        ;print message saying here is command code
    call    uerr
    pop    ax
    call    hout        ;hex the command code
    mov    ax,-4        ;print message saying here is errorcode
    call    uerr
    pop    ax
    call    nout        ;manual gives errors in decimal
    xor    ax,ax
    call    uerr        ;prints crlf
    jmp    hbye        ;always a fatal error
errcod    endp
benaints proc    near
;
;This could be done by macro byt since it gets called so many times...
;
;    Interrupt mask passed in AX
;    BX as always points to parameter list
;
    mov    [bx].w2,ax    ;Interrupt mask
    mov    ax,rcb
    mov    [bx].w1,ax
    mov    dx,bid
enaj:    mov    ax,1100h+maskint
    int    14h
    or    ax,ax
    jc    badmask
    ret
badmask:mov    bx,maskint
    jmp    errcod        ;don't mind not popping stack
benaints    endp
cenaints proc    near
;
;This could be done by macro byt since it gets called so many times...
;
;    Interrupt mask passed in AX
;    BX as always points to parameter list
;
    mov    [bx].w2,ax    ;Interrupt mask
    mov    [bx].w1,dx
    jmp    enaj
cenaints    endp
getmemory proc near
;
;This gets dynamic memory in C or Pascal environment call the heap allocator
;or Windows or Topview (or whatever) memory allocator. This should have
;conditional assembly parameters to support all those good things. Currently
;just ask DOS.
;
;On entry BX contains bytes required
;On exit DS and ES point to segment
;
    add    bx,10h        ;round to paragraph
    mov    cl,4
    shr    bx,cl
    mov    ah,48h        ;Allocate memory function
    int    dos
    jnc    aok
    push    ax        ;save return code
    mov    ax,-1        ;tell world memory allocate
    call    uerr
    pop    ax
    call    perr        ;prints DOS error
    stc
aok:    mov    ds,ax        ;set segment registers
    mov    es,ax        ;invalid if carry set
    ret

getmemory endp
;
;    Local timer to check on board uses stack space this is a busy
;    wait timer. If running in an environment with real tasking support
;    replace this code with something better!!!!
;
strtc    proc    near
    xor    ah,ah        ; read clock
    int    btod        ; BIOS time-of-day routine
    mov    [bp],cx        ; high portion of clock
    mov    [bp].2,dx    ; low portion of clock
    ret
strtc    endp
dw_mpd        dw    1000/10        ; msecs per decisecond
dw_tick_len    dw    tick_len    ; timer tick in msecs
chk_timr proc    near
    mov    ah,0        ;read clock
    int    btod        ;BIOS time-of-day routine
    sub    dx,[bp].2
    sbb    cx,[bp]
    mov    ax,dx        ;Prepare for mul/div
    mov    dx,cx        ; ax=lo, dx=hi
    mul    dw_tick_len    ;Convert ticks
    div    dw_mpd        ;to 100 msec ticks
    cmp    ax,[bp].4    ;Wait for specified time
    ret
chk_timr endp
;
;    Wait waits for an event or for timer to expire.
;    Carry exit means time expired. This can be replaced by
;    something that actually causes a context switch when DOS grows up
;
wait    proc    near  ;AX contains time in deciseconds in AX
    push    bx
    strt_timr
cloop0:    test    ret,1        ;This bit gets set when interrupt routine
    jne    donwat        ;is run
    call    chk_timr
    jl    cloop0
    add    sp,6        ;pop stack
    pop    bx
    stc            ;error exit
    ret
donwat:    add    sp,6
    pop    bx
    mov    ret,0
    clc            ;good exit
    ret
wait    endp
;
;    hbye    closes the vcapi, releases dynamic memory and exits
;
hbye    proc    near
    mov    ax,1100h+onhook
    lea    bx,parms        ;May have been clobbered by now
    mov    dx,rcb            ;dx = rcb
    mov    [bx].w1,dx        ;move rcb into paramater list
    mov    dx,1            ;Line 1 (no equate here)
    mov    [bx].w2,dx
    mov    dx,bid            ;Base commands
    int    14h
;don't care if this works or not
chkerr    =    0            ;don't check errors

    stuf1    conndevs,rcb,bid,telephone+line1
;don't care here either
    mov    ax,1100h+close
    lea    bx,plist        ;Address of parameter list
    mov    dx,bid            ;dx = base id (for base commands)
    int    14h
;
;Don't bother checking return code
;
    push    ds
    pop    es            ;free data segment
    mov    ah,49h
    int    dos
    mov    ax,4c00h
    int    dos            ;say goodbye with 0 return code
hbye    endp
code    ends
    end    main

Comment +

        ----- Cut here for ERR Module  -----


    title    ERR
    page    55,131
;
;    This module contains lots of error print out routines.
;    It uses its own data segment and is reentrant. Error
;    messages are referred to by number so any program can be
;    written and error messages later changed to whatever language
;    is desired.
;

cr    equ    13
lf    equ    10
zzrom    segment     public 'dseg'
ertab    dw    m0,m1,m2,m3,m4,m5,m6,m7,m8,m9
    dw    m10,m11,m12,m13,m14,m15,m16,m17,m18,m19
    dw    m20,m21,m22,m23,m24,m25,m26,m27,m28,m29
    dw    m30,m31,m32,m33,m34,m35
uertab    dw    u0,u1,u2,u3,u4,u5,u6,u7,u8,u9,u10,u11,u12,u13,u14,u15
dw10    dw    10
crlf    db    cr,lf,'$'
m0    db    '$'
m1    db    'Invalid Function Number$'
m2    db    'File not Found$'
m3    db    'Path not found$'
m4    db    'Too many Open Files$'
m5    db    'Access Denied$'
m6    db    'Invalid Handle$'
m7    db    'Memory Control blocks destroyed$'
m8    db    'Insufficient Memory$'
m9    db    'Invalid memory block address$'
m10    db    'Invalid environment$'
m11    db    'Invalid format$'
m12    db    'Invalid access code$'
m13    db    'Invalid data$'
m14    db    'Reserved (ask Microsoft)$'
m15    db    'Invalid drive specification$'
m16    db    'Attempt to remove current directory$'
m17    db    'Not same device$'
m18    db    'No more files$'
m19    db    'Diskette write protected$'
m20    db    'Unknown Unit$'
m21    db    'Drive not ready$'
m22    db    'Unknown Command$'
m23    db    'Data Error (CRC)$'
m24    db    'Bad request structure length$'
m25    db    'Seek error$'
m26    db    'Unknown Media Type$'
m27    db    'Sector not found$'
m28    db    'Printer out of paper$'
m29    db    'Write fault$'
m30    db    'Read fault$'
m31    db    'General failure$'
m32    db    'Sharing violation$'
m33    db    'Lock violation$'
m34    db    'Invalid disk change$'
m35    db    'FCB Unavailable$'
maxmsg    equ    35
unknown    db    'Unknown Error code $'
u0    db    '$'
u1    db    'Memory allocation: $'
u2    db    'Voice communications application interface not installed$'
u3    db    'Fatal Error calling VCAPI Command: $'
u4    db    ' Return Code: $'
u5    db    'Timed out waiting for VCAPI interrupt$'
u6    db    'Could not detect dial tone$'
u7    db    'Unable to detect modem carrier$'
u8    db    'modem carrier detected$'
u9    db    'ring$'
u10    db    'busy$'
u11    db    'modem start command failed$'
u12    db    ' parity errors$'
u13    db    ' frameing errors$'
u14    db    ' overun errors$'
u15    db    'no errors yet$'
maxumsg    equ    15
hextab    db    '0123456789ABCDEF'
last    label    byte
zzrom    ends
CODE    SEGMENT PARA PUBLIC 'CODE'
        ASSUME  CS:CODE,DS:zzrom
    public    perr        ;Prints DOS error
    public    uerr        ;User error
    public    nout        ;Print decimal AX
    public    whout        ;Print hex AX
    public    hout        ;print hex AL
    public    getlast        ;gets last value in memory
;
;    gets last paragraph boundary there are better ways and this
;    won't work in a high level language environment but....
;
getlast    proc    near
    lea    ax,last
    add    ax,0fh
    shr    ax,1
    shr    ax,1
    shr    ax,1
    shr    ax,1
    ret
getlast    endp
perr    proc    near
    push    ds
    push    ax
    mov    ax,zzrom    ;Got to address our strings
    mov    ds,ax
    pop    ax
    or    ax,ax        ;ax contains error code
    jg    ok
    jnz    unk
    jmp    short perr_x    ;do nothing for zero
unk:    push    ax
    lea    dx,unknown    ;never seen this error code
    mov    ah,9
    int    21h
    pop    ax
    call    whout        ;print numeric code
    jmp    short perr_x
ok:    cmp    ax,maxmsg
    jg    unk        ;unknown error
    add    ax,ax        ;make word inder
    mov    si,ax
    mov    dx,ertab[si]
    mov    ah,9
    int    21h
perr_x:    pop    ds
    ret
perr    endp
;
;    print an error string if error number is negative don't append CRLF
;
uerr    proc    near
    push    ds
    push    ax
    push    ax        ;save second one as crlf flag
    mov    ax,zzrom    ;Got to address our strings
    mov    ds,ax
    pop    ax
    or    ax,ax        ;ax contains error code
    jg    ok1
    neg    ax        ;Make negative positive
    jg    ok1
    jnz    unk1
    jmp    short uerr_x    ;do nothing for zero
unk1:    push    ax
    lea    dx,unknown    ;never seen this error code
    mov    ah,9
    int    21h
    pop    ax
    call    nout        ;print numeric code
    jmp    short uerr_x
ok1:    cmp    ax,maxumsg
    jg    unk1        ;unknown error
    add    ax,ax        ;make word inder
    mov    si,ax
    mov    dx,uertab[si]
    mov    ah,9
    int    21h
uerr_x:    pop    ax        ;If code was positive do crlf
    or    ax,ax        ;If negative don't
    jl    nocrlf
    lea    dx,crlf        ;get new line
    mov    ah,9
    int    21h
nocrlf:    pop    ds
    ret
uerr    endp

; Print the number in AX on the screen in decimal

NOUT     PROC    NEAR
    push    ds
    push    ax
    mov    ax,zzrom    ;Got to address our strings
    mov    ds,ax
    pop    ax
    push    dx
    mov    dx,0        ;High order word should be zero.
    div    dw10        ;AX <-- Quo, DX <-- Rem.
    cmp    ax,0        ;Are we done?
    jz    nout0        ;Yes.
    call    nout        ;If not, then recurse.
nout0:    add    dl,'0'        ;Make it printable.
    push    ax
    mov    ah,2        ;Single character to display
    int    21H
    pop    ax
    pop    dx
    pop    ds
    ret            ;We're done. [21c]
NOUT    ENDP
whout    proc    near        ;Print words worth of hex code
    push    ax
    call    hout        ;by calling hout twice
    pop    ax
    mov    al,ah
    jmp    hout
whout    endp
hout    proc    near        ;Print byte in hex
    push    ds
    push    ax
    mov    ax,zzrom    ;Got to address our strings
    mov    ds,ax
    pop    ax
    push    dx        ;Save registers used
    push    bx
    push    cx
    push    ax        ;Save input so we can get low nibble
    mov    cx,4        ;Do hi nibble first
    shr    al,cl
    and    ax,0fH        ;Just four bits
    lea    bx,hextab
    xlat    hextab        ;Turn into printable
    mov    dl,al        ;Print single character
    mov    ah,2
    int    21H
    pop    ax
    and    al,0fH        ;Now do low bits
    xlat    hextab
    mov    dl,al
    mov    ah,2
    int    21H
    pop    cx        ;and restore registers
    pop    bx
    pop    dx
    pop    ds
    ret
hout    endp
code    ends
    end

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