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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
*--------------------------------------
BUF.SIZE .EQ $20
BUF.MASK .EQ $1F
*--------------------------------------
ZPTmpPtr1 .EQ ZPDRV
*--------------------------------------
.INB DRV/X.SER.6551.S
*--------------------------------------
* see this :
* http://mirrors.apple2.org.za/apple.cabi.net/Applications/Telcom/SSC.DRIVER/SSC.DRIVER.TXT
* About False read issue in SSC
*--------------------------------------
* 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 #DEVMGR.ERRNOHW Not Found in any slot, exiting
sec
rts
.4 lda ZPTmpPtr1+1
* sta DEVSLOTCn
and #$0F
sta DEVSLOT0n
ora #$30
sta DEV.HEADER.NAME+4
asl
asl
asl
asl
sta DEVSLOTn0
clc
adc #SSC.DATA+1
sta DEV.DATA.BFFF
>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).\n"
MSG.DETECT.OK >CSTR "SSC Installed As Device : %S\n"
MSG.DETECT.KO >CSTR "No SSC Found.\n"
hArgs .BS 1
*--------------------------------------
* Device Header (16 Bytes)
*--------------------------------------
DEV.HEADER cld
jmp (DRV.CS.START,x)
.HS 00 DevID
.DA #S.DEV.F.IRQ+S.DEV.F.EVENT+S.DEV.F.COUT+S.DEV.F.CHAR
DEV.HEADER.NAME >PSTR "COM1" NAME
.HS 00
.HS 00.00.00.00
*--------------------------------------
* Driver Code
*--------------------------------------
DRV.CS.START .DA OPEN
.DA GETEVENT
.DA COUT
.DA CLOSE
.DA GETINFO
.DA IRQ
L.DEVINFO .DA DEVINFO
.DA 0 end or relocation
*--------------------------------------
OPEN php
sei
ldx DEVSLOTn0
stz SSC.RESET,x
stz INBUF.PTR
stz INBUF.CNT
stz OUTBUF.PTR
stz OUTBUF.CNT
lda #SSC.CTL.CLKINT+SSC.CTL.B9600
sta SSC.CTL,x
lda #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
*--------------------------------------
GETEVENT php
sei
lda INBUF.CNT
beq .9
ldx INBUF.PTR
lda INBUF,x
ldy #S.EVT.DATA
sta (pEvent),y
iny
lda #0
sta (pEvent),y
lda #S.EVT.F.KEY
sta (pEvent)
txa
inc
and #BUF.MASK
sta INBUF.PTR
dec INBUF.CNT
plp
clc
rts
.9 plp
lda #0
sec
rts
*--------------------------------------
COUT 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
ldx OUTBUF.CNT Buffer Empty?
bne .10 not empty, queue char
and #SSC.STATUS.TDRE Register Empty ?
beq .10 not empty, queue char
tya yes, write directly to ACIA
ldx DEV.DATA.BFFF
sta $BFFF,x
plp
clc
rts
.10 cpx #BUF.SIZE
beq .9 Buffer Full!!
lda OUTBUF.PTR
clc
adc OUTBUF.CNT
and #BUF.MASK
tax
tya
sta OUTBUF,x
inc OUTBUF.CNT
* ldx DEVSLOTn0
lda #SSC.CMD.TEIRQ+SSC.CMD.DTR
sta SSC.CMD,x
plp
clc
rts
.9 plp
sec
rts
*--------------------------------------
CLOSE php
sei
ldx DEVSLOTn0
stz SSC.RESET,x
plp
clc
rts
*--------------------------------------
GETINFO >LDYA L.DEVINFO
clc
rts
*--------------------------------------
* IRQ Handler
* on exit, CC if handled
*--------------------------------------
IRQ ldx DEVSLOTn0
lda SSC.STATUS,x IRQ from this device ?
* bpl .9 no, exit !!!!Applewin bug #308!!!!
bit #SSC.STATUS.RDRF incoming char?
beq .1
*------------ IRQ In
ldy SSC.DATA,x read data to clear IRQ
lda INBUF.CNT
cmp #BUF.SIZE
beq .8 buffer full, discard
clc
adc INBUF.PTR
and #BUF.MASK
tax
tya get back data
sta INBUF,x
inc INBUF.CNT
bra IRQ start over if
*------------ IRQ Out
.1 bit #SSC.STATUS.TDRE
beq .2 no transmit, no recieve, CTS changed!
lda OUTBUF.CNT something to transmit ?
beq .11 no, disable IRQ and exit
ldx OUTBUF.PTR
lda OUTBUF,x
ldy DEV.DATA.BFFF
sta $BFFF,y
dec OUTBUF.CNT
txa get back OUTBUF.PTR
inc
and #BUF.MASK
sta OUTBUF.PTR
clc
rts
.11 lda #SSC.CMD.TE+SSC.CMD.DTR
sta SSC.CMD,x
clc
rts
*------------ IRQ CTS High
.2
.8 clc
rts
.9 sec
rts
*--------------------------------------
DRV.CS.END
DEVSLOT0n .BS 1
*DEVSLOTCn .BS 1
DEV.DATA.BFFF .BS 1
DEVSLOTn0 .BS 1
INBUF.PTR .BS 1
INBUF.CNT .BS 1
OUTBUF.PTR .BS 1
OUTBUF.CNT .BS 1
INBUF .BS BUF.SIZE
OUTBUF .BS BUF.SIZE
DEVINFO .DA #S.DEVINFO.TYPE.CHAR
.DA #0
*--------------------------------------
MAN
SAVE DRV/SSC.DRV.I.S
ASM
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