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page 255
.z80
global msg_fifo
global msginit
global msg.out,msg.sout,msg.co
extrn buf.init
include config.inc
include z180reg.inc
;--------------------------------------------------------------
dseg
mkbuf msg_fifo, 0
;--------------------------------------------------------------
cseg
;
; Init buffer
;
msginit:
ld ix,msg_fifo
ld a,msg_fb_len-1
jp buf.init
;--------------------------------------------------------------
msg.sts:
push ix
ld ix,msg_fifo ;
ld a,(ix+o.in_idx) ;
inc a
and (ix+o.mask)
sub (ix+o.out_idx) ;
pop ix
ret z
or 0ffh
ret
;--------------------------------------------------------------
msg.out:
push ix
ld ix,msg_fifo ;
push bc
ld b,a ;save char
ld a,(ix+o.in_idx) ;
inc a
and (ix+o.mask)
bp.wait:
cp (ix+o.out_idx) ;
jr z,bp.wait
ld c,a
ld a,b
out (PMSG),a
ld (ix+o.in_idx),c
pop bc
pop ix
ret
;--------------------------------------------------------------
;
; (hl): data
msg.sout:
push ix
ld ix,msg_fifo ;
push bc
ld b,(hl) ;count
inc hl
obs_1:
ld a,(ix+o.out_idx) ;
sub (ix+o.in_idx) ;
dec a
and (ix+o.mask)
cp b
jr c,obs_1
ld c,(hl) ;port address
inc hl
ld a,b
otir
add (ix+o.in_idx)
and (ix+o.mask)
ld (ix+o.in_idx),a
pop bc
pop ix
ret
;----------------------------------------------------------------------
msg.co:
push af
push hl
ld (buf_char),a
ld hl,buf
call msg.sout
pop hl
pop af
ret
buf:
db buf_end - $ - 2 ;output string length
db PMSG ;output port
db 0AEh ; message start token
db buf_end - $ - 1 ; message length
db 1 ; command
db 1 ; subcommand
buf_char:
db 0 ; pay load
buf_end:
;----------------------------------------------------------------------
end
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