Stars of Shareware: Raytrace & Morphing/SOS-RAYTRACE.ISO/programm/source/devel5/glovdelh.asm

Assembly Source File | 1993-05-09 | 4.5 KB | 278 lines

    TITLE    GLOVEDEL - Powerglove timing and i/o support
    NAME    GLOVEDEL

    ; SPECIAL VERSION FOR COMBO HMD/GLOVE/SEGA UNIT

    COMMENT    $

    Name:        GLOVEDEL

        Written and (c) by Dave Stampe 24/4/92
        Not for commercial use, so get permission
        before marketing code using this stuff!
        For private PD use only.


     ATTRIBUTION:  If you use any part of this source code or the libraries
     in your projects, you must give attribution to REND386, Dave Stampe,
     and Bernie Roehl in your documentation, source code, and at startup
     of your program.  Let's keep the freeware ball rolling!
        $

        .MODEL large

EXTRN    _glove_in_port        ; GLOVE INTERFACE SPECS
EXTRN    _glove_out_port         ; SET UP IN C CODE

EXTRN    _glove_none_mask
EXTRN    _glove_data_mask
EXTRN    _glove_latch_mask
EXTRN    _glove_clock_mask
EXTRN    _glove_clock_latch

EXTRN    _glove_bit_delay

EXTRN    _port_image
EXTRN _glove_write_mask

        .CODE

; bit delay macro for byte read, line toggle

bitdelay macro
    local _localloop
    mov    cx,_glove_bit_delay
_localloop:
    in    al,41h
    loop    _localloop
endm



 ;
 ; int timed_glove_delay(int count);  /* returns time in 1.1925 MHZ ticks */
 ;                                    /* to perform <count> delay steps   */
 ;                      /* call with timer at 18.2 Hz rate  */

        PUBLIC    _timed_glove_delay

count equ [bp+6]

_timed_glove_delay    proc    far

    push    bp
    mov    bp,sp
    push    cx
    push    dx
    mov    cx,count
    pushf
    cli

    mov    al,00
    out    43h,al        ; latch counter
    nop
    nop
    in    al,40h          ; read count
    mov    ah,al
    in    al,40h
    xchg    al,ah
    mov    bx,ax

caloop: in      al,41h          ; do delay
    loop    caloop

    mov    al,00
    out    43h,al          ; read new count
    nop
    nop
    in    al,40h
    mov    ah,al
    in    al,40h
    xchg    al,ah
    sub    ax,bx           ; assumes default, count rollover at 65536
    neg    ax

    popf
    pop    dx
    pop    cx
    mov    sp,bp
    pop    bp
    ret

_timed_glove_delay    endp


 ;
 ; int glove_delay(int count);    /* performs <count> delay steps   */
 ;

        PUBLIC    _glove_delay

count equ [bp+6]

_glove_delay    proc    far

    push    bp
    mov    bp,sp
    push    cx
    push    dx
    mov    cx,count

gdel:    in    al,41h
    loop    gdel

    pop    dx
    pop    cx
    mov    sp,bp
    pop    bp
    ret

_glove_delay    endp



 ;
 ; int get_glove_byte();    /* reads a byte from glove */
 ;

        PUBLIC    _get_glove_byte

_get_glove_byte    proc    far

    push    bp
    mov    bp,sp
    push    si
    push    cx
    push    dx

    mov    dx,_glove_out_port
    mov    si,_glove_in_port

    mov    ax,_glove_clock_mask    ; preset lines
    pushf
    cli
    mov    ah,BYTE PTR _glove_write_mask
    not    ah
    and    ah,BYTE PTR _port_image
    or    al,ah
    mov    BYTE PTR _port_image,al
    out    dx,al                   ; output data
    popf
    bitdelay

    mov    ax,_glove_clock_latch
    pushf
    cli
    mov    ah,BYTE PTR _glove_write_mask
    not    ah
    and    ah,BYTE PTR _port_image
    or    al,ah
    mov    BYTE PTR _port_image,al
    out    dx,al                   ; output data
    popf
    bitdelay

    mov    ax,_glove_clock_mask
    pushf
    cli
    mov    ah,BYTE PTR _glove_write_mask
    not    ah
    and    ah,BYTE PTR _port_image
    or    al,ah
    mov    BYTE PTR _port_image,al
    out    dx,al                   ; output data
    popf
    bitdelay

    mov    bx,8000h                ; clear accumulator

bitloop:
    xchg    si,dx                   ; add bit to accumulator
    in    al,dx
    xchg    si,dx
    test    al,BYTE PTR _glove_data_mask
    jz    z0
    or    bl,bh
z0:                                     ; next bit
    shr    bh,1
    jz    endbyte

    mov    ax,_glove_none_mask     ; pulse clock line
    pushf
    cli
    mov    ah,BYTE PTR _glove_write_mask
    not    ah
    and    ah,BYTE PTR _port_image
    or    al,ah
    mov    BYTE PTR _port_image,al
    out    dx,al                   ; output data
    popf
    bitdelay

    mov    ax,_glove_clock_mask
    pushf
    cli
    mov    ah,BYTE PTR _glove_write_mask
    not    ah
    and    ah,BYTE PTR _port_image
    or    al,ah
    mov    BYTE PTR _port_image,al
    out    dx,al                   ; output data
    popf
    bitdelay
    jmp    bitloop

endbyte:
    mov    ax,bx
    xor    ah,ah
    pop    dx
    pop    cx
    pop    si
    mov    sp,bp
    pop    bp
    ret

_get_glove_byte    endp


 ;
 ; void set_glove_bits(int data);   /* sets glove clock, data lines */
 ;                                  /* and does a bit delay         */

        PUBLIC    _set_glove_bits

bits equ [bp+6]

_set_glove_bits    proc    far

    push    bp
    mov    bp,sp
    push    dx
    mov    dx,_glove_out_port
    mov    ax,bits

    pushf
    cli
    and    al,BYTE PTR _glove_write_mask
    mov    ah,BYTE PTR _glove_write_mask
    not    ah
    and    ah,BYTE PTR _port_image
    or    al,ah
    mov    BYTE PTR _port_image,al
    out    dx,al                   ; output data
    popf

    push    cx
    bitdelay
    pop    cx

    pop    dx
    mov    sp,bp
    pop    bp
    ret

_set_glove_bits    endp

        end