mirror of
https://github.com/A2osX/A2osX.git
synced 2024-11-22 16:31:07 +00:00
331 lines
6.5 KiB
Plaintext
331 lines
6.5 KiB
Plaintext
PR#3
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PREFIX /A2OSX.BUILD
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LOMEM $A00
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INC 1
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AUTO 6
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.LIST OFF
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.OP 65C02
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.OR $2000
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.TF /A2OSX.BUILD/DRV/SSC.I.DRV
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*--------------------------------------
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.INB /A2OSX.BUILD/INC/MACROS.I
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.INB /A2OSX.BUILD/INC/A2OSX.I
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.INB /A2OSX.BUILD/INC/MLI.ERR.I
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.INB /A2OSX.BUILD/INC/COM.6551.I
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*--------------------------------------
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BUF.SIZE .EQ $40
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BUF.MASK .EQ $3F
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*--------------------------------------
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ZPTmpPtr1 .EQ ZPDRV
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*--------------------------------------
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* File Header (16 Bytes)
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*--------------------------------------
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CS.START cld
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jmp Dev.Detect cld,jmp abs=DRV
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.DA #$61 6502,Level 1 (65c02)
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.DA #1 DRV Layout Version 1
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.DA 0
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.DA CS.END-CS.START Code Length
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.DA DEV.HEADER-CS.START Device Header Offset
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.DA DRV.CS.START-CS.START Driver Code Offset
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.DA DRV.CS.END-DRV.CS.START Drv Code Length
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*--------------------------------------
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* Relocation Table
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*--------------------------------------
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L.MSG.DETECT .DA MSG.DETECT
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L.MSG.DETECT.OK .DA MSG.DETECT.OK
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L.MSG.DETECT.KO .DA MSG.DETECT.KO
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L.DEV.HEADER.NAME .DA DEV.HEADER.NAME
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.DA 0 End Of Reloc Table
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*--------------------------------------
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Dev.Detect >STYA ARGS
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>LDYA L.MSG.DETECT
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>SYSCALL PrintF.YA
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stz ZPTmpPtr1
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lda #$C1
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sta ZPTmpPtr1+1
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.1 and #$0f
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tay
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lda A2osX.SLOTS,y
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bne .3
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ldx #DEVSIG.Length-1
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.2 ldy DEVSIG.Offset,x
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lda (ZPTmpPtr1),y
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cmp DEVSIG.Value,x
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bne .3
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dex
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bpl .2
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bra .4
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.3 inc ZPTmpPtr1+1 no match, try next slot....
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lda ZPTmpPtr1+1
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cmp #$C8
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bne .1
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>LDYA L.MSG.DETECT.KO
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>SYSCALL PrintF.YA
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lda #MLI.ERR.NODEV Not Found in any slot, exiting
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sec
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rts
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.4 lda ZPTmpPtr1+1
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and #$0F
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pha
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tay
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lda #A2osX.SLOTS.COM
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sta A2osX.SLOTS,y
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pla
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ora #$30
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sta DEV.HEADER.NAME+4
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asl
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asl
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asl
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asl
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sta DEVSLOTn0
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>PUSHW L.DEV.HEADER.NAME
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>LDYA L.MSG.DETECT.OK
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>SYSCALL PrintF.YA
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clc
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rts
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*--------------------------------------
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CS.END
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DEVSIG.Offset .HS 05070B0C
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DEVSIG.Value .HS 38180131
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DEVSIG.Length .EQ DEVSIG.Value-DEVSIG.Offset
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MSG.DETECT >CSTR "Apple SSC (Super Serial Card,//c Serial Port) Driver (IRQ Enabled).\r\n"
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MSG.DETECT.OK >CSTR "SSC Installed As Device : %S\r\n"
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MSG.DETECT.KO >CSTR "No SSC Found.\r\n"
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ARGS .BS 2
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*--------------------------------------
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* Device Header (16 Bytes)
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*--------------------------------------
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DEV.HEADER cld
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jmp (DRV.CS.START,x)
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.DA #S.DEV.S.WRITE+S.DEV.S.READ+S.DEV.S.IRQ
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.BS 6
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DEV.HEADER.NAME >PSTR "COM1" NAME
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*--------------------------------------
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* Driver Code
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*--------------------------------------
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DRV.CS.START .DA STATUS
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.DA A2osX.BADCALL
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.DA A2osX.BADCALL
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.DA A2osX.BADCALL
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.DA CONTROL
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.DA A2osX.BADCALL
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.DA OPEN
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.DA CLOSE
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.DA READ
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.DA WRITE
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.DA IRQ
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L.STAT .DA STAT
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.DA 0 end or relocation
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*--------------------------------------
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STATUS >LDYA L.STAT
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clc
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rts
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*--------------------------------------
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CONTROL clc
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rts
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*--------------------------------------
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OPEN php
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sei
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ldx DEVSLOTn0
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stz SSC.RESET,x
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stz INBUF.HEAD
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stz INBUF.TAIL
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stz OUTBUF.HEAD
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stz OUTBUF.TAIL
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lda #SSC.CTL.CLKEXT+SSC.CTL.B9600+SSC.CTL.8D+SSC.CTL.1S+SSC.CMD.NOP
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sta SSC.CTL,x
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lda #SSC.CMD.TEIRQ+SSC.CMD.TE+SSC.CMD.DTR
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sta SSC.CMD,x
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lda SSC.DATA,x discard any garbage byte
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lda SSC.STATUS,x clear any IRQ pending
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plp
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clc
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rts
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*--------------------------------------
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CLOSE php
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sei
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ldx DEVSLOTn0
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stz SSC.RESET,x
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plp
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clc
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rts
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*--------------------------------------
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READ php
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sei
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ldx INBUF.TAIL
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cpx INBUF.HEAD
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beq .9
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lda INBUF,x
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inx
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cpx #BUF.SIZE
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bne .1
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ldx #0
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.1 stx INBUF.TAIL
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plp
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clc
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rts
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.9 plp
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lda #0
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sec
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rts
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*--------------------------------------
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WRITE php
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sei
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tay save char in Y
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ldx DEVSLOTn0
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* lda SSC.STATUS,x
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* bit #SSC.STATUS.DCD+SSC.STATUS.DSR true when 0
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* bne .9
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lda OUTBUF.HEAD
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cmp OUTBUF.TAIL Buffer Empty?
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bne .11 not empty, queue char
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lda SSC.STATUS,x
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and #SSC.STATUS.TDRE Register Empty ?
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beq .10 not empty, queue char
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tya yes, write directly to ACIA
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sta SSC.DATA,x
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plp
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clc
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rts
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.10 lda OUTBUF.HEAD
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.11 tax
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inc
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and #BUF.MASK
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cmp OUTBUF.TAIL
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beq .9 Buffer Full!!
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sta OUTBUF.TAIL
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tya
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sta OUTBUF,x
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* ldx DEVSLOTn0
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* lda #SSC.CMD.TEIRQ+SSC.CMD.DTR
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* sta SSC.CMD,x
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plp
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clc
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rts
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.9 plp
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sec
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rts
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*--------------------------------------
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* IRQ Handler
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* on exit, CC if handled
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*--------------------------------------
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IRQ stz .8+1
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.1 ldx DEVSLOTn0
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lda SSC.STATUS,x
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* bpl .9 IRQ from this device ? no, exit !!!!Applewin bug #308!!!!
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bit #SSC.STATUS.RDRF incoming char?
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beq .4
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*------------ IRQ In
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ldy SSC.DATA,x read data to clear IRQ
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ldx INBUF.HEAD
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txa
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inc
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and #BUF.MASK
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cmp INBUF.TAIL
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beq .8 buffer full, discard and exit
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sta INBUF.HEAD
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tya
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sta INBUF,x
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lda #$ff
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sta .8+1
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bra .1
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*------------ IRQ Out
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.3 ldx DEVSLOTn0
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lda SSC.STATUS,x
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.4 bit #SSC.STATUS.TDRE
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beq .8 no transmition possible....
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ldy OUTBUF.TAIL something to transmit ?
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cpy OUTBUF.HEAD
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beq .8
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lda OUTBUF,y
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sta SSC.DATA,x
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iny
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cpy #BUF.SIZE
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bne .5
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ldy #0
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.5 sty OUTBUF.TAIL
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lda #$ff
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sta .8+1
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bra .3
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.8 lda #$ff did we finally handle and IRQ condtion ?
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beq .9
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clc
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rts
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.9 sec
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rts
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*--------------------------------------
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DRV.CS.END
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DEVSLOTn0 .BS 1
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INBUF.TAIL .BS 1
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INBUF.HEAD .BS 1
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OUTBUF.TAIL .BS 1
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OUTBUF.HEAD .BS 1
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INBUF .BS BUF.SIZE
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OUTBUF .BS BUF.SIZE
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*--------------------------------------
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STAT .DA #S.DEVSTAT.S.WRITE+S.DEVSTAT.S.READ+S.DEV.S.IRQ
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.DA #0,#0,#0
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>PSTR "Serial Card/Port"
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.DA #S.DEVSTAT.T.CHAR
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.DA #0
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.DA $0900
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*--------------------------------------
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MAN
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SAVE /A2OSX.SRC/DRV/SSC.I.DRV.S
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ASM
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