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page 255
.z80
global msg_rx_fifo,msg_tx_fifo
global msginit,msgi.st,msg.in,msgo.st,msg.out
global msg.sout,msg.co
extrn buf.init
include config.inc
include z180reg.inc
;--------------------------------------------------------------
dseg
mkbuf mtx.fifo_id, msg_tx_fifo, msg_tx_fifo_len
mkbuf mrx.fifo_id, msg_rx_fifo, msg_rx_fifo_len
;--------------------------------------------------------------
cseg
;
; Init buffer
;
msginit:
ld ix,msg_rx_fifo
ld a,msg_rx_fifo.mask
call buf.init
ld ix,msg_tx_fifo
ld a,msg_tx_fifo.mask
jp buf.init
;--------------------------------------------------------------
msgi.st:
push ix
ld ix,msg_rx_fifo ;
buf.empty:
ld a,(ix+o.in_idx) ;
sub (ix+o.out_idx) ;
pop ix
ret z
or 0ffh
ret
;--------------------------------------------------------------
msg.in:
push ix
ld ix,msg_rx_fifo ;
buf.get:
ld a,(ix+o.out_idx) ;
bg.wait:
cp (ix+o.in_idx) ;
jr z,bg.wait
push hl ;
push ix
pop hl
add a,l
ld l,a
jr nc,bg.nc
inc h
bg.nc:
ld l,(hl)
ld a,(ix+o.out_idx) ;
inc a
and (ix+o.mask)
ld (ix+o.out_idx),a
ld a,l
pop hl
pop ix
ret
;--------------------------------------------------------------
msgo.st:
push ix
ld ix,msg_tx_fifo ;
buf.full:
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_tx_fifo ;
buf.put:
push hl ;
push bc
push ix
pop hl
ld c,(ix+o.in_idx) ;
ld b,0
add hl,bc
ld b,a
ld a,c ;
inc a
and (ix+o.mask)
bp.wait:
cp (ix+o.out_idx) ;
jr z,bp.wait
ld (hl),b
ld (ix+o.in_idx),a
ld a,b
out0 (AVRINT5),a
pop bc
pop hl
pop ix
ret
;--------------------------------------------------------------
;--------------------------------------------------------------
;--------------------------------------------------------------
if 0
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
endif
;--------------------------------------------------------------
;
; (hl): data
msg.sout:
push ix
ld ix,msg_tx_fifo ;
push bc
push de
ld b,(hl) ;
inc hl
ex de,hl
ms.ol:
push ix
pop hl
ld c,(ix+o.in_idx) ;
ld a,c
add l
ld l,a
jr nc,ms.on
inc h
ms.on:
ld a,c ;
inc a
and (ix+o.mask)
ms.wait:
cp (ix+o.out_idx) ;
jr z,ms.wait
ld c,a
ld a,(de)
inc de
ld (hl),a
ld (ix+o.in_idx),c
djnz ms.ol
out0 (AVRINT5),a
ex de,hl
pop de
pop bc
pop ix
ret
;--------------------------------------------------------------
if 0
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
;----------------------------------------------------------------------
endif
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 - $ - 1 ;output string length
db 081h ; 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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