A2osX/DRV/SSC.I.DRV.S.txt

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PR#3
PREFIX /A2OSX.SRC
NEW
INC 1
AUTO 6
.LIST OFF
.OP 65C02
.OR $2000
.TF /A2OSX.BOOT/DRV/SSC.I.DRV
*--------------------------------------
.INB /A2OSX.DEV/INC/MACROS.I
.INB /A2OSX.DEV/INC/A2OSX.I
.INB /A2OSX.DEV/INC/MLI.ERR.I
.INB /A2OSX.DEV/INC/COM.6551.I
*--------------------------------------
BUF.SIZE .EQ $40
BUF.MASK .EQ $3F
*--------------------------------------
ZPTmpPtr1 .EQ ZPDRV
*--------------------------------------
* File Header (16 Bytes)
*--------------------------------------
CS.START cld
jmp Dev.Detect cld,jmp abs=DRV
.DA #$61 6502,Level 1 (65c02)
.DA #1 DRV Layout Version 1
.DA 0
.DA CS.END-CS.START Code Length
.DA DEV.HEADER-CS.START Device Header Offset
.DA DRV.CS.START-CS.START Driver Code Offset
.DA DRV.CS.END-DRV.CS.START Drv Code Length
*--------------------------------------
* Relocation Table
*--------------------------------------
L.MSG.DETECT .DA MSG.DETECT
L.MSG.DETECT.OK .DA MSG.DETECT.OK
L.MSG.DETECT.KO .DA MSG.DETECT.KO
L.DEV.HEADER.NAME .DA DEV.HEADER.NAME
.DA 0 End Of Reloc Table
*--------------------------------------
Dev.Detect sta hArgs
>LDYA L.MSG.DETECT
>SYSCALL CPrintFYA
stz ZPTmpPtr1
lda #$C1
sta ZPTmpPtr1+1
.1 ldx #DEVSIG.Length-1
.2 ldy DEVSIG.Offset,x
lda (ZPTmpPtr1),y
cmp DEVSIG.Value,x
bne .3
dex
bpl .2
bra .4
.3 inc ZPTmpPtr1+1 no match, try next slot....
lda ZPTmpPtr1+1
cmp #$C8
bne .1
>LDYA L.MSG.DETECT.KO
>SYSCALL CPrintFYA
lda #MLI.ERR.NODEV Not Found in any slot, exiting
sec
rts
.4 lda ZPTmpPtr1+1
and #$0F
ora #$30
sta DEV.HEADER.NAME+4
asl
asl
asl
asl
sta DEVSLOTn0
>PUSHW L.DEV.HEADER.NAME
>LDYA L.MSG.DETECT.OK
>SYSCALL CPrintFYA
clc
rts
*--------------------------------------
CS.END
DEVSIG.Offset .HS 05070B0C
DEVSIG.Value .HS 38180131
DEVSIG.Length .EQ DEVSIG.Value-DEVSIG.Offset
MSG.DETECT >CSTR "Apple SSC (Super Serial Card,//c Serial Port) Driver (IRQ Enabled).\r\n"
MSG.DETECT.OK >CSTR "SSC Installed As Device : %S\r\n"
MSG.DETECT.KO >CSTR "No SSC Found.\r\n"
hArgs .BS 1
*--------------------------------------
* Device Header (16 Bytes)
*--------------------------------------
DEV.HEADER cld
jmp (DRV.CS.START,x)
.DA #S.DEV.S.WRITE+S.DEV.S.READ+S.DEV.S.IRQ
.BS 6
DEV.HEADER.NAME >PSTR "COM1" NAME
*--------------------------------------
* Driver Code
*--------------------------------------
DRV.CS.START .DA STATUS
.DA BADCALL
.DA BADCALL
.DA BADCALL
.DA CONTROL
.DA BADCALL
.DA OPEN
.DA CLOSE
.DA READ
.DA WRITE
.DA IRQ
L.STAT .DA STAT
.DA 0 end or relocation
*--------------------------------------
BADCALL lda #MLI.ERR.BADCALL
sec
rts
*--------------------------------------
STATUS >LDYA L.STAT
clc
rts
*--------------------------------------
CONTROL clc
rts
*--------------------------------------
OPEN php
sei
ldx DEVSLOTn0
stz SSC.RESET,x
stz INBUF.HEAD
stz INBUF.TAIL
stz OUTBUF.HEAD
stz OUTBUF.TAIL
lda #SSC.CTL.CLKINT+SSC.CTL.B9600
sta SSC.CTL,x
lda #SSC.CMD.TEIRQ+SSC.CMD.TE+SSC.CMD.DTR
sta SSC.CMD,x
lda SSC.DATA,x discard any garbage byte
lda SSC.STATUS,x clear any IRQ pending
plp
clc
rts
*--------------------------------------
CLOSE php
sei
ldx DEVSLOTn0
stz SSC.RESET,x
plp
clc
rts
*--------------------------------------
READ php
sei
ldx INBUF.TAIL
cpx INBUF.HEAD
beq .9
lda INBUF,x
inx
cpx #BUF.SIZE
bne .1
ldx #0
.1 stx INBUF.TAIL
plp
clc
rts
.9 plp
lda #0
sec
rts
*--------------------------------------
WRITE php
sei
tay save char in Y
ldx DEVSLOTn0
* lda SSC.STATUS,x
* bit #SSC.STATUS.DCD+SSC.STATUS.DSR true when 0
* bne .9
lda OUTBUF.HEAD
cmp OUTBUF.TAIL Buffer Empty?
bne .11 not empty, queue char
lda SSC.STATUS,x
and #SSC.STATUS.TDRE Register Empty ?
beq .10 not empty, queue char
tya yes, write directly to ACIA
sta SSC.DATA,x
plp
clc
rts
.10 lda OUTBUF.HEAD
.11 tax
inc
and #BUF.MASK
cmp OUTBUF.TAIL
beq .9 Buffer Full!!
sta OUTBUF.TAIL
tya
sta OUTBUF,x
* ldx DEVSLOTn0
* lda #SSC.CMD.TEIRQ+SSC.CMD.DTR
* sta SSC.CMD,x
plp
clc
rts
.9 plp
sec
rts
*--------------------------------------
* IRQ Handler
* on exit, CC if handled
*--------------------------------------
IRQ stz .8+1
.1 ldx DEVSLOTn0
lda SSC.STATUS,x
* bpl .9 IRQ from this device ? no, exit !!!!Applewin bug #308!!!!
bit #SSC.STATUS.RDRF incoming char?
beq .4
*------------ IRQ In
ldy SSC.DATA,x read data to clear IRQ
ldx INBUF.HEAD
txa
inc
and #BUF.MASK
cmp INBUF.TAIL
beq .8 buffer full, discard and exit
sta INBUF.HEAD
tya
sta INBUF,x
lda #$ff
sta .8+1
bra .1
*------------ IRQ Out
.3 ldx DEVSLOTn0
lda SSC.STATUS,x
.4 bit #SSC.STATUS.TDRE
beq .8 no transmition possible....
ldy OUTBUF.TAIL something to transmit ?
cpy OUTBUF.HEAD
beq .8
lda OUTBUF,y
sta SSC.DATA,x
iny
cpy #BUF.SIZE
bne .5
ldy #0
.5 sty OUTBUF.TAIL
lda #$ff
sta .8+1
bra .3
.8 lda #$ff did we finally handle and IRQ condtion ?
beq .9
clc
rts
.9 sec
rts
*--------------------------------------
DRV.CS.END
DEVSLOTn0 .BS 1
INBUF.TAIL .BS 1
INBUF.HEAD .BS 1
OUTBUF.TAIL .BS 1
OUTBUF.HEAD .BS 1
INBUF .BS BUF.SIZE
OUTBUF .BS BUF.SIZE
*--------------------------------------
STAT .DA #S.DEVSTAT.S.WRITE+S.DEVSTAT.S.READ+S.DEV.S.IRQ
.DA #0,#0,#0
>PSTR "Serial Card/Port"
.DA #S.DEVSTAT.TYPE.CHAR
.DA #0
.DA $0900
*--------------------------------------
MAN
SAVE DRV/SSC.DRV.I.S
ASM