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

PR#3
PREFIX /A2OSX.SRC
NEW
INC 1
AUTO 6
				.LIST OFF	
				.OP	65C02
				.OR $2000
				.TF /A2OSX.BOOT/DRV/SSC.I.DRV
*--------------------------------------
				.INB INC/MACROS.I
				.INB INC/A2OSX.I
*--------------------------------------
BUF.SIZE		.EQ $20
BUF.MASK		.EQ $1F
*--------------------------------------
ZPTmpPtr1		.EQ ZPDRV
*--------------------------------------
* see this :
* http://mirrors.apple2.org.za/apple.cabi.net/Applications/Telcom/SSC.DRIVER/SSC.DRIVER.TXT
* About False read issue in SSC
*--------------------------------------
* SSC/ACIA I/O
*--------------------------------------
SSC.REG.DIPSW1	.EQ $C081				R
SSC.REG.DIPSW2	.EQ $C082				R
SSC.REG.DATA	.EQ $C088				R,W
SSC.REG.RESET	.EQ $C089				W
SSC.REG.STATUS	.EQ $C089				R
SSC.REG.STATUS.IRQ	.EQ %10000000
SSC.REG.STATUS.DSR	.EQ %01000000
SSC.REG.STATUS.DCD	.EQ %00100000
SSC.REG.STATUS.TDRE	.EQ %00010000
SSC.REG.STATUS.RDRF	.EQ %00001000
SSC.REG.STATUS.OE	.EQ %00000100
SSC.REG.STATUS.FE	.EQ %00000010
SSC.REG.STATUS.PE	.EQ %00000001
SSC.REG.CMD		.EQ $C08A				W
SSC.REG.CMD.NOP		.EQ %00000000
SSC.REG.CMD.ODDP	.EQ %00100000
SSC.REG.CMD.EVENP	.EQ %01100000
SSC.REG.CMD.MARKP	.EQ %10100000
SSC.REG.CMD.SPACEP	.EQ %11100000
SSC.REG.CMD.ECHO	.EQ %00010000
SSC.REG.CMD.TBRK	.EQ %00001100
SSC.REG.CMD.TE		.EQ %00001000
SSC.REG.CMD.TEIRQ	.EQ %00000100
SSC.REG.CMD.RIRQDIS	.EQ %00000010
SSC.REG.CMD.DTR		.EQ %00000001
SSC.REG.CTL		.EQ $C08B				W
SSC.REG.CTL.1S		.EQ %00000000
SSC.REG.CTL.2S		.EQ %10000000
SSC.REG.CTL.8D		.EQ %00000000
SSC.REG.CTL.7D		.EQ %00100000
SSC.REG.CTL.6D		.EQ %01000000
SSC.REG.CTL.5D		.EQ %01100000
SSC.REG.CTL.CLKEXT	.EQ %00000000
SSC.REG.CTL.CLKINT	.EQ %00010000
SSC.REG.CTL.B16EXT	.EQ %00000000
SSC.REG.CTL.B50		.EQ %00000001
SSC.REG.CTL.B75		.EQ %00000010
SSC.REG.CTL.B110	.EQ %00000011
SSC.REG.CTL.B135	.EQ %00000100
SSC.REG.CTL.B150	.EQ %00000101
SSC.REG.CTL.B300	.EQ %00000110
SSC.REG.CTL.B600	.EQ %00000111
SSC.REG.CTL.B1200	.EQ %00001000
SSC.REG.CTL.B1800	.EQ %00001001
SSC.REG.CTL.B2400	.EQ %00001010
SSC.REG.CTL.B3600	.EQ %00001011
SSC.REG.CTL.B4800	.EQ %00001100
SSC.REG.CTL.B7200	.EQ %00001101
SSC.REG.CTL.B9600	.EQ %00001110
SSC.REG.CTL.B19200	.EQ %00001111
*--------------------------------------
*			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 SYS.PSTROutYA
				
				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 SYS.PSTROutYA

				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.REG.DATA+1
				sta DEV.DATA.BFFF
				>LDYA L.MSG.DETECT.OK
				>SYSCALL SYS.PSTROutYA
				>LDYA L.DEV.HEADER.NAME
				>SYSCALL SYS.PSTROutYA
				lda #13
				>SYSCALL SYS.COutA

				clc
				rts
*--------------------------------------
CS.END
DEVSIG.Offset	.HS 05070B0C
DEVSIG.Value	.HS 38180131
DEVSIG.Length	.EQ DEVSIG.Value-DEVSIG.Offset
MSG.DETECT		>PSTRING "Apple SSC (Super Serial Card,//c Serial Port) Driver (IRQ Enabled).\n"
MSG.DETECT.OK	>PSTRING "SSC Installed As Device : "
MSG.DETECT.KO	>PSTRING "No SSC Found.\n"
hArgs			.BS 1
*--------------------------------------
*			Device Header (16 Bytes)
*--------------------------------------
DEV.HEADER		cld
				jmp (DRV.CS.START,x)
				.DA #S.DEV.F.IRQ+S.DEV.F.EVENT+S.DEV.F.COUT+S.DEV.F.CHAR
DEV.HEADER.NAME	>PSTRING "COM1"			NAME
				.HS 00.00
				.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.REG.RESET,x 
				
				stz INBUF.PTR
				stz INBUF.CNT
				stz OUTBUF.PTR
				stz OUTBUF.CNT
				
				lda #SSC.REG.CTL.CLKINT+SSC.REG.CTL.B9600
				sta SSC.REG.CTL,x
				
				lda #SSC.REG.CMD.TE+SSC.REG.CMD.DTR
				sta SSC.REG.CMD,x
				
				lda SSC.REG.DATA,x		discard any garbage byte
				lda SSC.REG.STATUS,x	clear any IRQ pending
				bmi *
				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.REG.STATUS,x
				bit #SSC.REG.STATUS.DCD+SSC.REG.STATUS.DSR		true when 0
				bne .9
				
				ldx OUTBUF.CNT			Buffer Empty?
				bne .10					not empty, queue char

				and #SSC.REG.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.REG.CMD.TEIRQ+SSC.REG.CMD.DTR
				sta SSC.REG.CMD,x
				plp
				clc
				rts
				
.9				plp
				sec
				rts
*--------------------------------------
CLOSE			php
				sei
				ldx DEVSLOTn0
				stz SSC.REG.RESET,x 
				plp
				clc
				rts
*--------------------------------------
GETINFO			>LDYA L.DEVINFO
				clc
				rts
*--------------------------------------
* IRQ Handler
* on exit, CC if handled
*--------------------------------------
IRQ				ldx DEVSLOTn0
				lda SSC.REG.STATUS,x	IRQ from this device ?
				bpl .9					no, exit

				bit #SSC.REG.STATUS.RDRF	incoming char?
				beq .1					

*------------ IRQ In

				ldy SSC.REG.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
				clc
				rts
				
*------------ IRQ Out

.1				bit #SSC.REG.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.REG.CMD.TE+SSC.REG.CMD.DTR
				sta SSC.REG.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