A2osX/DRV/SSC.DRV.S.txt

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PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
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INC 1
AUTO 6
.LIST OFF
.OP 65C02
.OR $2000
.TF /A2OSX.BUILD/DRV/SSC.DRV
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*--------------------------------------
.INB /A2OSX.BUILD/INC/MACROS.I
.INB /A2OSX.BUILD/INC/A2OSX.I
.INB /A2OSX.BUILD/INC/MLI.ERR.I
.INB /A2OSX.BUILD/INC/COM.6551.I
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*--------------------------------------
ZPTmpPtr1 .EQ ZPDRV
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*--------------------------------------
* File Header (16 Bytes)
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*--------------------------------------
CS.START cld
jmp Dev.Detect cld,jmp abs=DRV
.DA #$61 6502,Level 1 (65c02)
.DA #1 DRV Layout Version 1
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.DA 0
.DA CS.END-CS.START Code Length
.DA DEV.HEADER-CS.START Device Header Offset
.DA DRV.CS.START-CS.START Driver Code Offset
.DA DRV.CS.END-DRV.CS.START Drv Code Length
*--------------------------------------
* Relocation Table
*--------------------------------------
L.MSG.DETECT .DA MSG.DETECT
L.MSG.DETECT.OK .DA MSG.DETECT.OK
L.MSG.DETECT.KO .DA MSG.DETECT.KO
L.DEV.HEADER.NAME .DA DEV.HEADER.NAME
.DA 0 End Of Reloc Table
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*--------------------------------------
Dev.Detect >STYA ARGS
>LDYA L.MSG.DETECT
>SYSCALL PrintF.YA
stz ZPTmpPtr1
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lda #$C1
sta ZPTmpPtr1+1
.1 and #$0f
tay
lda A2osX.S,y
bne .3
ldx #DEVSIG.Length-1
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.2 ldy DEVSIG.Offset,x
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lda (ZPTmpPtr1),y
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cmp DEVSIG.Value,x
bne .3
dex
bpl .2
bra .4
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.3 inc ZPTmpPtr1+1 no match, try next slot....
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lda ZPTmpPtr1+1
cmp #$C8
bne .1
>LDYA L.MSG.DETECT.KO
>SYSCALL PrintF.YA
lda #MLI.ERR.NODEV Not Found in any slot, exiting
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sec
rts
.4 lda ZPTmpPtr1+1
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and #$0F
pha
tay
lda #A2osX.S.COM
sta A2osX.S,y
pla
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ora #$30
sta DEV.HEADER.NAME+3
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asl
asl
asl
asl
sta DEVSLOTn0
>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 >CSTR "Apple SSC (Super Serial Card,//c Serial Port) Driver.\r\n"
MSG.DETECT.OK >CSTR "SSC Installed As Device : %s\r\n"
MSG.DETECT.KO >CSTR "No SSC Found.\r\n"
ARGS .BS 2
*--------------------------------------
* Device Header (16 Bytes)
*--------------------------------------
DEV.HEADER cld
jmp (DRV.CS.START,x)
.DA #S.DEV.S.WRITE+S.DEV.S.READ
.BS 6
DEV.HEADER.NAME >CSTR "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
L.STAT .DA STAT
.DA 0 end or relocation
*--------------------------------------
STATUS >LDYA L.STAT
clc
rts
*--------------------------------------
CONTROL clc
rts
*--------------------------------------
OPEN ldx DEVSLOTn0
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php
sei
stz SSC.RESET,x
lda #SSC.CTL.CLKEXT+SSC.CTL.B9600+SSC.CTL.8D+SSC.CTL.1S+SSC.CMD.NOP
sta SSC.CTL,x
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ldx DEVSLOTn0
lda #SSC.CMD.RIRQDIS+SSC.CMD.TE+SSC.CMD.DTR
sta SSC.CMD,x
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lda SSC.STATUS,x clear any IRQ pending
bmi *
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plp
clc
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rts
*--------------------------------------
CLOSE php
sei
ldx DEVSLOTn0
stz SSC.RESET,x
plp
clc
rts
*--------------------------------------
READ ldx DEVSLOTn0
lda SSC.STATUS,x
bmi *
and #SSC.STATUS.RDRF incoming char?
beq .9
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lda SSC.DATA,x
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clc
rts
.9 lda #0
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sec
rts
*--------------------------------------
WRITE pha
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ldx DEVSLOTn0
.1 lda SSC.STATUS,x
* and #SSC.STATUS.DCD+SSC.STATUS.DSR
* beq .9
and #SSC.STATUS.TDRE Outgoing char?
beq .1
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pla
sta SSC.DATA,x
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clc
rts
.9 pla
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sec
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rts
*--------------------------------------
DRV.CS.END
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DEVSLOTn0 .BS 1
*--------------------------------------
STAT .DA #S.DEVSTAT.S.WRITE+S.DEVSTAT.S.READ
.DA #0,#0,#0
>PSTR "Serial Card/Port"
.DA #S.DEVSTAT.T.CHAR
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.DA #0
.DA $0900
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*--------------------------------------
MAN
SAVE /A2OSX.SRC/DRV/SSC.DRV.S
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ASM