A2osX/DRV/X.SSC.DRV.S.txt

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PREFIX /A2OSX.BUILD
AUTO 4,1
.OP 65C02
.OR $2000
*--------------------------------------
.DO SSCIRQ=1
.TF /A2OSX.BUILD/DRV/SSC.I.DRV
.ELSE
.TF /A2OSX.BUILD/DRV/SSC.DRV
.FIN
*--------------------------------------
.DO SSCIRQ=1
BUF.SIZE .EQ $40
BUF.MASK .EQ $3F
.FIN
*--------------------------------------
ZPTmpPtr1 .EQ ZPDRV
*--------------------------------------
* File Header (16 Bytes)
*--------------------------------------
CS.START cld
jmp Dev.Detect cld,jmp abs=DRV
.DA #$61 6502,Level 1 (65c02)
.DA #1 DRV Layout Version 1
.DA 0
.DA CS.END-CS.START Code Length
.DA DEV.HEADER-CS.START Device Header Offset
.DA DRV.CS.START-CS.START Driver Code Offset
.DA DRV.CS.END-DRV.CS.START Drv Code Length
*--------------------------------------
* Relocation Table
*--------------------------------------
L.MSG.DETECT .DA MSG.DETECT
L.MSG.DETECT.OK .DA MSG.DETECT.OK
L.MSG.DETECT.KO .DA MSG.DETECT.KO
L.DEV.HEADER.NAME .DA DEV.HEADER.NAME
.DA 0 End Of Reloc Table
*--------------------------------------
Dev.Detect >STYA ARGS
>LDYA L.MSG.DETECT
>SYSCALL PrintF.YA
stz ZPTmpPtr1
lda #$C1
sta ZPTmpPtr1+1
.1 and #$0f
tay
lda A2osX.S,y
bne .3
ldx #DEVSIG.Length-1
.2 ldy DEVSIG.Offset,x
lda (ZPTmpPtr1),y
cmp DEVSIG.Value,x
bne .3
dex
bpl .2
bra .4
.3 inc ZPTmpPtr1+1 no match, try next slot....
lda ZPTmpPtr1+1
cmp #$C8
bne .1
>LDYA L.MSG.DETECT.KO
>SYSCALL PrintF.YA
lda #MLI.E.NODEV Not Found in any slot, exiting
sec
rts
.4 lda ZPTmpPtr1+1
and #$0F
pha
tay
lda #A2osX.S.COM
sta A2osX.S,y
pla
ora #$30
sta DEV.HEADER.NAME+3
asl
asl
asl
asl
clc
adc #$8F
sta DEVSLOTn08F
>PUSHW L.DEV.HEADER.NAME
>LDYA L.MSG.DETECT.OK
>SYSCALL PrintF.YA
clc
rts
*--------------------------------------
CS.END
DEVSIG.Offset .HS 05070B0C
DEVSIG.Value .HS 38180131
DEVSIG.Length .EQ DEVSIG.Value-DEVSIG.Offset
MSG.DETECT .DO SSCIRQ=1
.AZ "Apple SSC (Super Serial Card,//c Serial Port) Driver (IRQ Enabled).\r\n"
.ELSE
.AZ "Apple SSC (Super Serial Card,//c Serial Port) Driver.\r\n"
.FIN
MSG.DETECT.OK .AZ "SSC Installed As Device : %s\r\n"
MSG.DETECT.KO .AZ "No SSC Found.\r\n"
ARGS .BS 2
*--------------------------------------
* Device Header (16 Bytes)
*--------------------------------------
DEV.HEADER cld
jmp (DRV.CS.START,x)
.DO SSCIRQ=1
.DA #S.DEV.S.WRITE+S.DEV.S.READ+S.DEV.S.IRQ
.ELSE
.DA #S.DEV.S.WRITE+S.DEV.S.READ
.FIN
.BS 6
DEV.HEADER.NAME .AZ "COM1" NAME
*--------------------------------------
* Driver Code
*--------------------------------------
DRV.CS.START .DA STATUS
.DA A2osX.BADCALL
.DA A2osX.BADCALL
.DA A2osX.BADCALL
.DA CONTROL
.DA A2osX.BADCALL
.DA OPEN
.DA CLOSE
.DA READ
.DA WRITE
.DO SSCIRQ=1
.DA IRQ
.FIN
L.STAT .DA STAT
.DA 0 end or relocation
*--------------------------------------
STATUS >LDYA L.STAT
clc
rts
*--------------------------------------
CONTROL clc
rts
*--------------------------------------
OPEN php
sei
ldx DEVSLOTn08F
stz SSC.RESET-$8F,x
lda #SSC.CTL.CLKINT+SSC.CTL.B9600+SSC.CTL.8D+SSC.CTL.1S+SSC.CMD.NOP
sta SSC.CTL-$8F,x
.DO SSCIRQ=1
lda #SSC.CMD.TEIRQ+SSC.CMD.TE+SSC.CMD.DTR
sta SSC.CMD-$8F,x
stz INBUF.HEAD
stz INBUF.TAIL
stz OUTBUF.HEAD
stz OUTBUF.TAIL
.ELSE
lda #SSC.CMD.RIRQDIS+SSC.CMD.TE+SSC.CMD.DTR
sta SSC.CMD-$8F,x
.FIN
lda SSC.DATA-$8F,x discard any garbage byte
lda SSC.STATUS-$8F,x clear any IRQ pending
plp
clc
rts
*--------------------------------------
CLOSE php
sei
ldx DEVSLOTn08F
stz SSC.RESET-$8F,x
plp
clc
rts
*--------------------------------------
READ .DO SSCIRQ=1
php
sei
ldx INBUF.TAIL
cpx INBUF.HEAD
beq .2
lda INBUF,x
inx
cpx #BUF.SIZE
bne .1
ldx #0
.1 stx INBUF.TAIL
plp
clc
rts
.2 ldx DEVSLOTn08F
lda SSC.STATUS-$8F,x
and #SSC.STATUS.nDSR true when 0
beq .90
lda #26 EOF
.90 plp
sec
rts
.ELSE
ldx DEVSLOTn08F
lda SSC.STATUS-$8F,x
and #SSC.STATUS.RDRF incoming char?
beq .9
lda SSC.DATA-$8F,x
clc
rts
.9 lda #0
sec
rts
.FIN
*--------------------------------------
WRITE .DO SSCIRQ=1
php
sei
tay save char in Y
ldx DEVSLOTn08F
lda SSC.STATUS-$8F,x
bit #SSC.STATUS.nDSR true when 0
bne .90
lda OUTBUF.HEAD
cmp OUTBUF.TAIL Buffer Empty?
bne .11 not empty, queue char
lda SSC.STATUS-$8F,x
and #SSC.STATUS.TDRE Register Empty ?
beq .10 not empty, queue char
tya yes, write directly to ACIA
sta SSC.DATA-$8F,x
plp
clc
rts
.10 lda OUTBUF.HEAD
.11 tax
inc
and #BUF.MASK
cmp OUTBUF.TAIL
beq .9 Buffer Full!!
sta OUTBUF.HEAD
tya
sta OUTBUF,x
plp
clc
rts
.90 lda #26 EOF
.9 plp
sec
rts
.ELSE
pha
ldx DEVSLOTn08F
.1 lda SSC.STATUS-$8F,x
* and #SSC.STATUS.DCD+SSC.STATUS.DSR
* beq .9
and #SSC.STATUS.TDRE Outgoing char?
beq .1
pla
sta SSC.DATA-$8F,x
clc
rts
.9 pla
sec
rts
.FIN
*--------------------------------------
* IRQ Handler
* on exit, CC if handled
*--------------------------------------
.DO SSCIRQ=1
IRQ ldx DEVSLOTn08F
lda SSC.STATUS-$8F,x
* and #SSC.STATUS.IRQ Useless
bpl .9 IRQ from this device ? no, exit !!!!Applewin bug #308!!!!
bit #SSC.STATUS.RDRF incoming char?
beq .2
*------------ IRQ In
pha
lda INBUF.HEAD
tay save actual head for later
inc
and #BUF.MASK
cmp INBUF.TAIL
beq .1 buffer full, discard and exit
sta INBUF.HEAD
lda SSC.DATA-$8F,x read data to clear IRQ
sta INBUF,y
.1 pla
*------------ IRQ Out
.2 bit #SSC.STATUS.TDRE
beq .8 no transmition possible....
ldy OUTBUF.TAIL something to transmit ?
cpy OUTBUF.HEAD
beq .8 in that case, HOW TO CLEAR IRQ ????
lda OUTBUF,y
sta SSC.DATA-$8F,x write data to clear IRQ
tya
inc
and #BUF.MASK
sta OUTBUF.TAIL
.8 clc
rts
.9 sec
rts
.FIN
*--------------------------------------
DRV.CS.END
DEVSLOTn08F .BS 1
.DO SSCIRQ=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
.FIN
*--------------------------------------
STAT .DO SSCIRQ=1
.DA #S.DSTAT.S.WRITE+S.DSTAT.S.READ+S.DEV.S.IRQ
.ELSE
.DA #S.DSTAT.S.WRITE+S.DSTAT.S.READ
.FIN
.DA #0,#0,#0
>PSTR "Serial Card/Port"
.DA #S.DSTAT.T.CHAR
.DA #0
.DA #0
.DA #91
*--------------------------------------
MAN
SAVE /A2OSX.SRC/DRV/X.SSC.DRV.S
LOAD /A2OSX.SRC/DRV/SSC.I.DRV.S
ASM