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+;.lib "axm"
+;
+;begin
+;title "A2232 serial board driver"
+;
+;set modules "2232"
+;set executable "2232.bin"
+;
+;;;;set nolink
+;
+;set temporary directory "t:"
+;
+;set assembly options "-m6502 -l60:t:list"
+;set link options "bin"; loadadr"
+;;;bin2c 2232.bin msc6502.h msc6502code
+;end
+;
+;
+; ### Commodore A2232 serial board driver for NetBSD by JM v1.3 ###
+;
+; - Created 950501 by JM -
+;
+;
+; Serial board driver software.
+;
+;
+% Copyright (c) 1995 Jukka Marin <jmarin@jmp.fi>.
+% All rights reserved.
+%
+% Redistribution and use in source and binary forms, with or without
+% modification, are permitted provided that the following conditions
+% are met:
+% 1. Redistributions of source code must retain the above copyright
+% notice, and the entire permission notice in its entirety,
+% including the disclaimer of warranties.
+% 2. Redistributions in binary form must reproduce the above copyright
+% notice, this list of conditions and the following disclaimer in the
+% documentation and/or other materials provided with the distribution.
+% 3. The name of the author may not be used to endorse or promote
+% products derived from this software without specific prior
+% written permission.
+%
+% ALTERNATIVELY, this product may be distributed under the terms of
+% the GNU General Public License, in which case the provisions of the
+% GPL are required INSTEAD OF the above restrictions. (This clause is
+% necessary due to a potential bad interaction between the GPL and
+% the restrictions contained in a BSD-style copyright.)
+%
+% THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
+% WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+% OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+% DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+% INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+% (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+% SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+% HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+% STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+% OF THE POSSIBILITY OF SUCH DAMAGE.
+;
+;
+; Bugs:
+;
+; - Can't send a break yet
+;
+;
+;
+; Edited:
+;
+; - 950501 by JM -> v0.1 - Created this file.
+; - 951029 by JM -> v1.3 - Carrier Detect events now queued in a separate
+; queue.
+;
+;
+
+
+CODE equ $3800 ; start address for program code
+
+
+CTL_CHAR equ $00 ; byte in ibuf is a character
+CTL_EVENT equ $01 ; byte in ibuf is an event
+
+EVENT_BREAK equ $01
+EVENT_CDON equ $02
+EVENT_CDOFF equ $03
+EVENT_SYNC equ $04
+
+XON equ $11
+XOFF equ $13
+
+
+VARBASE macro *starting_address ; was VARINIT
+_varbase set \1
+ endm
+
+VARDEF macro *name space_needs
+\1 equ _varbase
+_varbase set _varbase+\2
+ endm
+
+
+stz macro * address
+ db $64,\1
+ endm
+
+stzax macro * address
+ db $9e,<\1,>\1
+ endm
+
+
+biti macro * immediate value
+ db $89,\1
+ endm
+
+smb0 macro * address
+ db $87,\1
+ endm
+smb1 macro * address
+ db $97,\1
+ endm
+smb2 macro * address
+ db $a7,\1
+ endm
+smb3 macro * address
+ db $b7,\1
+ endm
+smb4 macro * address
+ db $c7,\1
+ endm
+smb5 macro * address
+ db $d7,\1
+ endm
+smb6 macro * address
+ db $e7,\1
+ endm
+smb7 macro * address
+ db $f7,\1
+ endm
+
+
+
+;-----------------------------------------------------------------------;
+; ;
+; stuff common for all ports, non-critical (run once / loop) ;
+; ;
+DO_SLOW macro * port_number ;
+ .local ; ;
+ lda CIA+C_PA ; check all CD inputs ;
+ cmp CommonCDo ; changed from previous accptd? ;
+ beq =over ; nope, do nothing else here ;
+ ; ;
+ cmp CommonCDb ; bouncing? ;
+ beq =nobounce ; nope -> ;
+ ; ;
+ sta CommonCDb ; save current state ;
+ lda #64 ; reinitialize counter ;
+ sta CommonCDc ; ;
+ jmp =over ; skip CD save ;
+ ; ;
+=nobounce dec CommonCDc ; no, decrement bounce counter ;
+ bpl =over ; not done yet, so skip CD save ;
+ ; ;
+=saveCD ldx CDHead ; get write index ;
+ sta cdbuf,x ; save status in buffer ;
+ inx ; ;
+ cpx CDTail ; buffer full? ;
+ .if ne ; no: preserve status: ;
+ stx CDHead ; update index in RAM ;
+ sta CommonCDo ; save state for the next check ;
+ .end ; ;
+=over .end local ;
+ endm ;
+ ;
+;-----------------------------------------------------------------------;
+
+
+; port specific stuff (no data transfer)
+
+DO_PORT macro * port_number
+ .local ; ;
+ lda SetUp\1 ; reconfiguration request? ;
+ .if ne ; yes: ;
+ lda SoftFlow\1 ; get XON/XOFF flag ;
+ sta XonOff\1 ; save it ;
+ lda Param\1 ; get parameter ;
+ ora #%00010000 ; use baud generator for Rx ;
+ sta ACIA\1+A_CTRL ; store in control register ;
+ stz OutDisable\1 ; enable transmit output ;
+ stz SetUp\1 ; no reconfiguration no more ;
+ .end ; ;
+ ; ;
+ lda InHead\1 ; get write index ;
+ sbc InTail\1 ; buffer full soon? ;
+ cmp #200 ; 200 chars or more in buffer? ;
+ lda Command\1 ; get Command reg value ;
+ and #%11110011 ; turn RTS OFF by default ;
+ .if cc ; still room in buffer: ;
+ ora #%00001000 ; turn RTS ON ;
+ .end ; ;
+ sta ACIA\1+A_CMD ; set/clear RTS ;
+ ; ;
+ lda OutFlush\1 ; request to flush output buffer;
+ .if ne ; yessh! ;
+ lda OutHead\1 ; get head ;
+ sta OutTail\1 ; save as tail ;
+ stz OutDisable\1 ; enable transmit output ;
+ stz OutFlush\1 ; clear request ;
+ .end
+ .end local
+ endm
+
+
+DO_DATA macro * port number
+ .local
+ lda ACIA\1+A_SR ; read ACIA status register ;
+ biti [1<<3] ; something received? ;
+ .if ne ; yes: ;
+ biti [1<<1] ; framing error? ;
+ .if ne ; yes: ;
+ lda ACIA\1+A_DATA ; read received character ;
+ bne =SEND ; not break -> ignore it ;
+ ldx InHead\1 ; get write pointer ;
+ lda #CTL_EVENT ; get type of byte ;
+ sta ictl\1,x ; save it in InCtl buffer ;
+ lda #EVENT_BREAK ; event code ;
+ sta ibuf\1,x ; save it as well ;
+ inx ; ;
+ cpx InTail\1 ; still room in buffer? ;
+ .if ne ; absolutely: ;
+ stx InHead\1 ; update index in memory ;
+ .end ; ;
+ jmp =SEND ; go check if anything to send ;
+ .end ; ;
+ ; normal char received: ;
+ ldx InHead\1 ; get write index ;
+ lda ACIA\1+A_DATA ; read received character ;
+ sta ibuf\1,x ; save char in buffer ;
+ stzax ictl\1 ; set type to CTL_CHAR ;
+ inx ; ;
+ cpx InTail\1 ; buffer full? ;
+ .if ne ; no: preserve character: ;
+ stx InHead\1 ; update index in RAM ;
+ .end ; ;
+ and #$7f ; mask off parity if any ;
+ cmp #XOFF ; XOFF from remote host? ;
+ .if eq ; yes: ;
+ lda XonOff\1 ; if XON/XOFF handshaking.. ;
+ sta OutDisable\1 ; ..disable transmitter ;
+ .end ; ;
+ .end ; ;
+ ; ;
+ ; BUFFER FULL CHECK WAS HERE ;
+ ; ;
+=SEND lda ACIA\1+A_SR ; transmit register empty? ;
+ and #[1<<4] ; ;
+ .if ne ; yes: ;
+ ldx OutCtrl\1 ; sending out XON/XOFF? ;
+ .if ne ; yes: ;
+ lda CIA+C_PB ; check CTS signal ;
+ and #[1<<\1] ; (for this port only) ;
+ bne =DONE ; not allowed to send -> done ;
+ stx ACIA\1+A_DATA ; transmit control char ;
+ stz OutCtrl\1 ; clear flag ;
+ jmp =DONE ; and we're done ;
+ .end ; ;
+ ; ;
+ ldx OutTail\1 ; anything to transmit? ;
+ cpx OutHead\1 ; ;
+ .if ne ; yes: ;
+ lda OutDisable\1 ; allowed to transmit? ;
+ .if eq ; yes: ;
+ lda CIA+C_PB ; check CTS signal ;
+ and #[1<<\1] ; (for this port only) ;
+ bne =DONE ; not allowed to send -> done ;
+ lda obuf\1,x ; get a char from buffer ;
+ sta ACIA\1+A_DATA ; send it away ;
+ inc OutTail\1 ; update read index ;
+ .end ; ;
+ .end ; ;
+ .end ; ;
+=DONE .end local
+ endm
+
+
+
+PORTVAR macro * port number
+ VARDEF InHead\1 1
+ VARDEF InTail\1 1
+ VARDEF OutDisable\1 1
+ VARDEF OutHead\1 1
+ VARDEF OutTail\1 1
+ VARDEF OutCtrl\1 1
+ VARDEF OutFlush\1 1
+ VARDEF SetUp\1 1
+ VARDEF Param\1 1
+ VARDEF Command\1 1
+ VARDEF SoftFlow\1 1
+ ; private:
+ VARDEF XonOff\1 1
+ endm
+
+
+ VARBASE 0 ; start variables at address $0000
+ PORTVAR 0 ; define variables for port 0
+ PORTVAR 1 ; define variables for port 1
+ PORTVAR 2 ; define variables for port 2
+ PORTVAR 3 ; define variables for port 3
+ PORTVAR 4 ; define variables for port 4
+ PORTVAR 5 ; define variables for port 5
+ PORTVAR 6 ; define variables for port 6
+
+
+
+ VARDEF Crystal 1 ; 0 = unknown, 1 = normal, 2 = turbo
+ VARDEF Pad_a 1
+ VARDEF TimerH 1
+ VARDEF TimerL 1
+ VARDEF CDHead 1
+ VARDEF CDTail 1
+ VARDEF CDStatus 1
+ VARDEF Pad_b 1
+
+ VARDEF CommonCDo 1 ; for carrier detect optimization
+ VARDEF CommonCDc 1 ; for carrier detect debouncing
+ VARDEF CommonCDb 1 ; for carrier detect debouncing
+
+
+ VARBASE $0200
+ VARDEF obuf0 256 ; output data (characters only)
+ VARDEF obuf1 256
+ VARDEF obuf2 256
+ VARDEF obuf3 256
+ VARDEF obuf4 256
+ VARDEF obuf5 256
+ VARDEF obuf6 256
+
+ VARDEF ibuf0 256 ; input data (characters, events etc - see ictl)
+ VARDEF ibuf1 256
+ VARDEF ibuf2 256
+ VARDEF ibuf3 256
+ VARDEF ibuf4 256
+ VARDEF ibuf5 256
+ VARDEF ibuf6 256
+
+ VARDEF ictl0 256 ; input control information (type of data in ibuf)
+ VARDEF ictl1 256
+ VARDEF ictl2 256
+ VARDEF ictl3 256
+ VARDEF ictl4 256
+ VARDEF ictl5 256
+ VARDEF ictl6 256
+
+ VARDEF cdbuf 256 ; CD event queue
+
+
+ACIA0 equ $4400
+ACIA1 equ $4c00
+ACIA2 equ $5400
+ACIA3 equ $5c00
+ACIA4 equ $6400
+ACIA5 equ $6c00
+ACIA6 equ $7400
+
+A_DATA equ $00
+A_SR equ $02
+A_CMD equ $04
+A_CTRL equ $06
+; 00 write transmit data read received data
+; 02 reset ACIA read status register
+; 04 write command register read command register
+; 06 write control register read control register
+
+CIA equ $7c00 ; 8520 CIA
+C_PA equ $00 ; port A data register
+C_PB equ $02 ; port B data register
+C_DDRA equ $04 ; data direction register for port A
+C_DDRB equ $06 ; data direction register for port B
+C_TAL equ $08 ; timer A
+C_TAH equ $0a
+C_TBL equ $0c ; timer B
+C_TBH equ $0e
+C_TODL equ $10 ; TOD LSB
+C_TODM equ $12 ; TOD middle byte
+C_TODH equ $14 ; TOD MSB
+C_DATA equ $18 ; serial data register
+C_INTCTRL equ $1a ; interrupt control register
+C_CTRLA equ $1c ; control register A
+C_CTRLB equ $1e ; control register B
+
+
+
+
+
+ section main,code,CODE-2
+
+ db >CODE,<CODE
+
+;-----------------------------------------------------------------------;
+; here's the initialization code: ;
+; ;
+R_RESET ldx #$ff ;
+ txs ; initialize stack pointer ;
+ cld ; in case a 6502 is used... ;
+ ldx #0 ; ;
+ lda #0 ; ;
+ ldy #Crystal ; this many bytes to clear ;
+clr_loop sta 0,x ; clear zero page variables ;
+ inx ; ;
+ dey ; ;
+ bne clr_loop ; ;
+ ; ;
+ stz CommonCDo ; force CD test at boot ;
+ stz CommonCDb ; ;
+ stz CDHead ; clear queue ;
+ stz CDTail ; ;
+ ; ;
+ lda #0 ; ;
+ sta Pad_a ; ;
+ lda #170 ; test cmp ;
+ cmp #100 ; ;
+ .if cs ; ;
+ inc Pad_a ; C was set ;
+ .end ; ;
+ ;
+;-----------------------------------------------------------------------;
+; Speed check ;
+;-----------------------------------------------------------------------;
+ ;
+ lda Crystal ; speed already set? ;
+ beq DoSpeedy ; ;
+ jmp LOOP ; yes, skip speed test ;
+ ; ;
+DoSpeedy lda #%10011000 ; 8N1, 1200/2400 bps ;
+ sta ACIA0+A_CTRL ; ;
+ lda #%00001011 ; enable DTR ;
+ sta ACIA0+A_CMD ; ;
+ lda ACIA0+A_SR ; read status register ;
+ ; ;
+ lda #%10000000 ; disable all ints (unnecessary);
+ sta CIA+C_INTCTRL ; ;
+ lda #255 ; program the timer ;
+ sta CIA+C_TAL ; ;
+ sta CIA+C_TAH ; ;
+ ; ;
+ ldx #0 ; ;
+ stx ACIA0+A_DATA ; transmit a zero ;
+ nop ; ;
+ nop ; ;
+ lda ACIA0+A_SR ; read status ;
+ nop ; ;
+ nop ; ;
+ stx ACIA0+A_DATA ; transmit a zero ;
+Speedy1 lda ACIA0+A_SR ; read status ;
+ and #[1<<4] ; transmit data reg empty? ;
+ beq Speedy1 ; not yet, wait more ;
+ ; ;
+ lda #%00010001 ; load & start the timer ;
+ stx ACIA0+A_DATA ; transmit one more zero ;
+ sta CIA+C_CTRLA ; ;
+Speedy2 lda ACIA0+A_SR ; read status ;
+ and #[1<<4] ; transmit data reg empty? ;
+ beq Speedy2 ; not yet, wait more ;
+ stx CIA+C_CTRLA ; stop the timer ;
+ ; ;
+ lda CIA+C_TAL ; copy timer value for 68k ;
+ sta TimerL ; ;
+ lda CIA+C_TAH ; ;
+ sta TimerH ; ;
+ cmp #$d0 ; turbo or normal? ;
+ .if cs ; ;
+ lda #2 ; turbo! :-) ;
+ .else ; ;
+ lda #1 ; normal :-( ;
+ .end ; ;
+ sta Crystal ; ;
+ lda #0 ; ;
+ sta ACIA0+A_SR ; ;
+ sta ACIA0+A_CTRL ; reset UART ;
+ sta ACIA0+A_CMD ; ;
+ ;
+ jmp LOOP ;
+ ;
+; ;
+;-----------------------------------------------------------------------;
+; ;
+; The Real Thing: ;
+; ;
+LOOP DO_SLOW ; do non-critical things ;
+ jsr do_input ; check for received data
+ DO_PORT 0
+ jsr do_input
+ DO_PORT 1
+ jsr do_input
+ DO_PORT 2
+ jsr do_input
+ DO_PORT 3
+ jsr do_input
+ DO_PORT 4
+ jsr do_input
+ DO_PORT 5
+ jsr do_input
+ DO_PORT 6
+ jsr do_input
+ jmp LOOP
+
+
+do_input DO_DATA 0
+ DO_DATA 1
+ DO_DATA 2
+ DO_DATA 3
+ DO_DATA 4
+ DO_DATA 5
+ DO_DATA 6
+ rts
+
+
+;-----------------------------------------------------------------------;
+ section vectors,data,$3ffa
+ dw $d0d0
+ dw R_RESET
+ dw $c0ce
+;-----------------------------------------------------------------------;
+
+
+
+ end
+
+
+
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