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1275 |
phoenix |
;.lib "axm"
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;
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;begin
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;title "A2232 serial board driver"
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;
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;set modules "2232"
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;set executable "2232.bin"
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;
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;;;;set nolink
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;
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;set temporary directory "t:"
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;
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;set assembly options "-m6502 -l60:t:list"
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;set link options "bin"; loadadr"
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;;;bin2c 2232.bin msc6502.h msc6502code
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;end
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;
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;
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; ### Commodore A2232 serial board driver for NetBSD by JM v1.3 ###
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;
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; - Created 950501 by JM -
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;
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;
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; Serial board driver software.
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;
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;
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% Copyright (c) 1995 Jukka Marin .
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% All rights reserved.
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%
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% Redistribution and use in source and binary forms, with or without
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% modification, are permitted provided that the following conditions
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% are met:
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% 1. Redistributions of source code must retain the above copyright
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% notice, and the entire permission notice in its entirety,
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% including the disclaimer of warranties.
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% 2. Redistributions in binary form must reproduce the above copyright
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% notice, this list of conditions and the following disclaimer in the
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% documentation and/or other materials provided with the distribution.
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% 3. The name of the author may not be used to endorse or promote
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% products derived from this software without specific prior
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% written permission.
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%
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% ALTERNATIVELY, this product may be distributed under the terms of
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% the GNU General Public License, in which case the provisions of the
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% GPL are required INSTEAD OF the above restrictions. (This clause is
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% necessary due to a potential bad interaction between the GPL and
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% the restrictions contained in a BSD-style copyright.)
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%
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% THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
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% WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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% OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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% DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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% INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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% (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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% SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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% HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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% STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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% OF THE POSSIBILITY OF SUCH DAMAGE.
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;
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;
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; Bugs:
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;
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; - Can't send a break yet
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;
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;
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;
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; Edited:
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;
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; - 950501 by JM -> v0.1 - Created this file.
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; - 951029 by JM -> v1.3 - Carrier Detect events now queued in a separate
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; queue.
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;
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;
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CODE equ $3800 ; start address for program code
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CTL_CHAR equ $00 ; byte in ibuf is a character
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CTL_EVENT equ $01 ; byte in ibuf is an event
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EVENT_BREAK equ $01
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EVENT_CDON equ $02
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EVENT_CDOFF equ $03
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EVENT_SYNC equ $04
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XON equ $11
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XOFF equ $13
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VARBASE macro *starting_address ; was VARINIT
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_varbase set \1
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endm
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VARDEF macro *name space_needs
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\1 equ _varbase
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_varbase set _varbase+\2
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endm
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stz macro * address
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db $64,\1
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endm
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stzax macro * address
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db $9e,<\1,>\1
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endm
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biti macro * immediate value
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db $89,\1
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endm
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smb0 macro * address
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db $87,\1
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endm
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smb1 macro * address
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db $97,\1
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endm
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smb2 macro * address
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db $a7,\1
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endm
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smb3 macro * address
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db $b7,\1
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endm
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smb4 macro * address
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db $c7,\1
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endm
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smb5 macro * address
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db $d7,\1
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endm
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smb6 macro * address
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db $e7,\1
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endm
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smb7 macro * address
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db $f7,\1
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endm
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;-----------------------------------------------------------------------;
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; ;
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; stuff common for all ports, non-critical (run once / loop) ;
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; ;
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DO_SLOW macro * port_number ;
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.local ; ;
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lda CIA+C_PA ; check all CD inputs ;
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cmp CommonCDo ; changed from previous accptd? ;
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beq =over ; nope, do nothing else here ;
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; ;
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cmp CommonCDb ; bouncing? ;
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beq =nobounce ; nope -> ;
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; ;
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sta CommonCDb ; save current state ;
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lda #64 ; reinitialize counter ;
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sta CommonCDc ; ;
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jmp =over ; skip CD save ;
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; ;
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=nobounce dec CommonCDc ; no, decrement bounce counter ;
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bpl =over ; not done yet, so skip CD save ;
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; ;
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=saveCD ldx CDHead ; get write index ;
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sta cdbuf,x ; save status in buffer ;
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inx ; ;
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cpx CDTail ; buffer full? ;
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.if ne ; no: preserve status: ;
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stx CDHead ; update index in RAM ;
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sta CommonCDo ; save state for the next check ;
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.end ; ;
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=over .end local ;
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endm ;
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;
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;-----------------------------------------------------------------------;
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; port specific stuff (no data transfer)
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DO_PORT macro * port_number
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.local ; ;
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lda SetUp\1 ; reconfiguration request? ;
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.if ne ; yes: ;
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lda SoftFlow\1 ; get XON/XOFF flag ;
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sta XonOff\1 ; save it ;
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lda Param\1 ; get parameter ;
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ora #%00010000 ; use baud generator for Rx ;
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sta ACIA\1+A_CTRL ; store in control register ;
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stz OutDisable\1 ; enable transmit output ;
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stz SetUp\1 ; no reconfiguration no more ;
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.end ; ;
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; ;
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lda InHead\1 ; get write index ;
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sbc InTail\1 ; buffer full soon? ;
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cmp #200 ; 200 chars or more in buffer? ;
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lda Command\1 ; get Command reg value ;
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and #%11110011 ; turn RTS OFF by default ;
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.if cc ; still room in buffer: ;
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ora #%00001000 ; turn RTS ON ;
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.end ; ;
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sta ACIA\1+A_CMD ; set/clear RTS ;
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; ;
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lda OutFlush\1 ; request to flush output buffer;
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.if ne ; yessh! ;
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lda OutHead\1 ; get head ;
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sta OutTail\1 ; save as tail ;
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stz OutDisable\1 ; enable transmit output ;
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stz OutFlush\1 ; clear request ;
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.end
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.end local
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endm
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DO_DATA macro * port number
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.local
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lda ACIA\1+A_SR ; read ACIA status register ;
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biti [1<<3] ; something received? ;
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.if ne ; yes: ;
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biti [1<<1] ; framing error? ;
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.if ne ; yes: ;
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lda ACIA\1+A_DATA ; read received character ;
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bne =SEND ; not break -> ignore it ;
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ldx InHead\1 ; get write pointer ;
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lda #CTL_EVENT ; get type of byte ;
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sta ictl\1,x ; save it in InCtl buffer ;
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lda #EVENT_BREAK ; event code ;
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sta ibuf\1,x ; save it as well ;
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inx ; ;
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cpx InTail\1 ; still room in buffer? ;
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.if ne ; absolutely: ;
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stx InHead\1 ; update index in memory ;
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.end ; ;
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jmp =SEND ; go check if anything to send ;
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.end ; ;
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; normal char received: ;
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ldx InHead\1 ; get write index ;
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lda ACIA\1+A_DATA ; read received character ;
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sta ibuf\1,x ; save char in buffer ;
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stzax ictl\1 ; set type to CTL_CHAR ;
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inx ; ;
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cpx InTail\1 ; buffer full? ;
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.if ne ; no: preserve character: ;
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stx InHead\1 ; update index in RAM ;
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.end ; ;
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and #$7f ; mask off parity if any ;
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cmp #XOFF ; XOFF from remote host? ;
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.if eq ; yes: ;
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lda XonOff\1 ; if XON/XOFF handshaking.. ;
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sta OutDisable\1 ; ..disable transmitter ;
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.end ; ;
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.end ; ;
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; ;
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; BUFFER FULL CHECK WAS HERE ;
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; ;
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=SEND lda ACIA\1+A_SR ; transmit register empty? ;
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and #[1<<4] ; ;
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.if ne ; yes: ;
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ldx OutCtrl\1 ; sending out XON/XOFF? ;
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.if ne ; yes: ;
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lda CIA+C_PB ; check CTS signal ;
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and #[1<<\1] ; (for this port only) ;
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bne =DONE ; not allowed to send -> done ;
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stx ACIA\1+A_DATA ; transmit control char ;
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stz OutCtrl\1 ; clear flag ;
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jmp =DONE ; and we're done ;
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.end ; ;
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; ;
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ldx OutTail\1 ; anything to transmit? ;
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cpx OutHead\1 ; ;
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.if ne ; yes: ;
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lda OutDisable\1 ; allowed to transmit? ;
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.if eq ; yes: ;
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lda CIA+C_PB ; check CTS signal ;
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and #[1<<\1] ; (for this port only) ;
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bne =DONE ; not allowed to send -> done ;
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lda obuf\1,x ; get a char from buffer ;
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sta ACIA\1+A_DATA ; send it away ;
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inc OutTail\1 ; update read index ;
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.end ; ;
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.end ; ;
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.end ; ;
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=DONE .end local
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endm
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PORTVAR macro * port number
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VARDEF InHead\1 1
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VARDEF InTail\1 1
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VARDEF OutDisable\1 1
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VARDEF OutHead\1 1
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VARDEF OutTail\1 1
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VARDEF OutCtrl\1 1
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VARDEF OutFlush\1 1
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VARDEF SetUp\1 1
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VARDEF Param\1 1
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VARDEF Command\1 1
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VARDEF SoftFlow\1 1
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; private:
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VARDEF XonOff\1 1
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endm
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VARBASE 0 ; start variables at address $0000
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PORTVAR 0 ; define variables for port 0
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PORTVAR 1 ; define variables for port 1
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PORTVAR 2 ; define variables for port 2
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PORTVAR 3 ; define variables for port 3
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PORTVAR 4 ; define variables for port 4
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PORTVAR 5 ; define variables for port 5
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PORTVAR 6 ; define variables for port 6
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VARDEF Crystal 1 ; 0 = unknown, 1 = normal, 2 = turbo
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VARDEF Pad_a 1
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VARDEF TimerH 1
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VARDEF TimerL 1
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VARDEF CDHead 1
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VARDEF CDTail 1
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VARDEF CDStatus 1
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| 321 |
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VARDEF Pad_b 1
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VARDEF CommonCDo 1 ; for carrier detect optimization
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| 324 |
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VARDEF CommonCDc 1 ; for carrier detect debouncing
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VARDEF CommonCDb 1 ; for carrier detect debouncing
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VARBASE $0200
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VARDEF obuf0 256 ; output data (characters only)
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VARDEF obuf1 256
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VARDEF obuf2 256
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VARDEF obuf3 256
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VARDEF obuf4 256
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VARDEF obuf5 256
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VARDEF obuf6 256
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VARDEF ibuf0 256 ; input data (characters, events etc - see ictl)
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VARDEF ibuf1 256
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VARDEF ibuf2 256
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VARDEF ibuf3 256
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VARDEF ibuf4 256
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VARDEF ibuf5 256
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VARDEF ibuf6 256
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VARDEF ictl0 256 ; input control information (type of data in ibuf)
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| 346 |
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VARDEF ictl1 256
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| 347 |
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VARDEF ictl2 256
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VARDEF ictl3 256
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VARDEF ictl4 256
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VARDEF ictl5 256
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VARDEF ictl6 256
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| 353 |
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VARDEF cdbuf 256 ; CD event queue
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| 355 |
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ACIA0 equ $4400
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|
|
ACIA1 equ $4c00
|
| 358 |
|
|
ACIA2 equ $5400
|
| 359 |
|
|
ACIA3 equ $5c00
|
| 360 |
|
|
ACIA4 equ $6400
|
| 361 |
|
|
ACIA5 equ $6c00
|
| 362 |
|
|
ACIA6 equ $7400
|
| 363 |
|
|
|
| 364 |
|
|
A_DATA equ $00
|
| 365 |
|
|
A_SR equ $02
|
| 366 |
|
|
A_CMD equ $04
|
| 367 |
|
|
A_CTRL equ $06
|
| 368 |
|
|
; 00 write transmit data read received data
|
| 369 |
|
|
; 02 reset ACIA read status register
|
| 370 |
|
|
; 04 write command register read command register
|
| 371 |
|
|
; 06 write control register read control register
|
| 372 |
|
|
|
| 373 |
|
|
CIA equ $7c00 ; 8520 CIA
|
| 374 |
|
|
C_PA equ $00 ; port A data register
|
| 375 |
|
|
C_PB equ $02 ; port B data register
|
| 376 |
|
|
C_DDRA equ $04 ; data direction register for port A
|
| 377 |
|
|
C_DDRB equ $06 ; data direction register for port B
|
| 378 |
|
|
C_TAL equ $08 ; timer A
|
| 379 |
|
|
C_TAH equ $0a
|
| 380 |
|
|
C_TBL equ $0c ; timer B
|
| 381 |
|
|
C_TBH equ $0e
|
| 382 |
|
|
C_TODL equ $10 ; TOD LSB
|
| 383 |
|
|
C_TODM equ $12 ; TOD middle byte
|
| 384 |
|
|
C_TODH equ $14 ; TOD MSB
|
| 385 |
|
|
C_DATA equ $18 ; serial data register
|
| 386 |
|
|
C_INTCTRL equ $1a ; interrupt control register
|
| 387 |
|
|
C_CTRLA equ $1c ; control register A
|
| 388 |
|
|
C_CTRLB equ $1e ; control register B
|
| 389 |
|
|
|
| 390 |
|
|
|
| 391 |
|
|
|
| 392 |
|
|
|
| 393 |
|
|
|
| 394 |
|
|
section main,code,CODE-2
|
| 395 |
|
|
|
| 396 |
|
|
db >CODE,
|
| 397 |
|
|
|
| 398 |
|
|
;-----------------------------------------------------------------------;
|
| 399 |
|
|
; here's the initialization code: ;
|
| 400 |
|
|
; ;
|
| 401 |
|
|
R_RESET ldx #$ff ;
|
| 402 |
|
|
txs ; initialize stack pointer ;
|
| 403 |
|
|
cld ; in case a 6502 is used... ;
|
| 404 |
|
|
ldx #0 ; ;
|
| 405 |
|
|
lda #0 ; ;
|
| 406 |
|
|
ldy #Crystal ; this many bytes to clear ;
|
| 407 |
|
|
clr_loop sta 0,x ; clear zero page variables ;
|
| 408 |
|
|
inx ; ;
|
| 409 |
|
|
dey ; ;
|
| 410 |
|
|
bne clr_loop ; ;
|
| 411 |
|
|
; ;
|
| 412 |
|
|
stz CommonCDo ; force CD test at boot ;
|
| 413 |
|
|
stz CommonCDb ; ;
|
| 414 |
|
|
stz CDHead ; clear queue ;
|
| 415 |
|
|
stz CDTail ; ;
|
| 416 |
|
|
; ;
|
| 417 |
|
|
lda #0 ; ;
|
| 418 |
|
|
sta Pad_a ; ;
|
| 419 |
|
|
lda #170 ; test cmp ;
|
| 420 |
|
|
cmp #100 ; ;
|
| 421 |
|
|
.if cs ; ;
|
| 422 |
|
|
inc Pad_a ; C was set ;
|
| 423 |
|
|
.end ; ;
|
| 424 |
|
|
;
|
| 425 |
|
|
;-----------------------------------------------------------------------;
|
| 426 |
|
|
; Speed check ;
|
| 427 |
|
|
;-----------------------------------------------------------------------;
|
| 428 |
|
|
;
|
| 429 |
|
|
lda Crystal ; speed already set? ;
|
| 430 |
|
|
beq DoSpeedy ; ;
|
| 431 |
|
|
jmp LOOP ; yes, skip speed test ;
|
| 432 |
|
|
; ;
|
| 433 |
|
|
DoSpeedy lda #%10011000 ; 8N1, 1200/2400 bps ;
|
| 434 |
|
|
sta ACIA0+A_CTRL ; ;
|
| 435 |
|
|
lda #%00001011 ; enable DTR ;
|
| 436 |
|
|
sta ACIA0+A_CMD ; ;
|
| 437 |
|
|
lda ACIA0+A_SR ; read status register ;
|
| 438 |
|
|
; ;
|
| 439 |
|
|
lda #%10000000 ; disable all ints (unnecessary);
|
| 440 |
|
|
sta CIA+C_INTCTRL ; ;
|
| 441 |
|
|
lda #255 ; program the timer ;
|
| 442 |
|
|
sta CIA+C_TAL ; ;
|
| 443 |
|
|
sta CIA+C_TAH ; ;
|
| 444 |
|
|
; ;
|
| 445 |
|
|
ldx #0 ; ;
|
| 446 |
|
|
stx ACIA0+A_DATA ; transmit a zero ;
|
| 447 |
|
|
nop ; ;
|
| 448 |
|
|
nop ; ;
|
| 449 |
|
|
lda ACIA0+A_SR ; read status ;
|
| 450 |
|
|
nop ; ;
|
| 451 |
|
|
nop ; ;
|
| 452 |
|
|
stx ACIA0+A_DATA ; transmit a zero ;
|
| 453 |
|
|
Speedy1 lda ACIA0+A_SR ; read status ;
|
| 454 |
|
|
and #[1<<4] ; transmit data reg empty? ;
|
| 455 |
|
|
beq Speedy1 ; not yet, wait more ;
|
| 456 |
|
|
; ;
|
| 457 |
|
|
lda #%00010001 ; load & start the timer ;
|
| 458 |
|
|
stx ACIA0+A_DATA ; transmit one more zero ;
|
| 459 |
|
|
sta CIA+C_CTRLA ; ;
|
| 460 |
|
|
Speedy2 lda ACIA0+A_SR ; read status ;
|
| 461 |
|
|
and #[1<<4] ; transmit data reg empty? ;
|
| 462 |
|
|
beq Speedy2 ; not yet, wait more ;
|
| 463 |
|
|
stx CIA+C_CTRLA ; stop the timer ;
|
| 464 |
|
|
; ;
|
| 465 |
|
|
lda CIA+C_TAL ; copy timer value for 68k ;
|
| 466 |
|
|
sta TimerL ; ;
|
| 467 |
|
|
lda CIA+C_TAH ; ;
|
| 468 |
|
|
sta TimerH ; ;
|
| 469 |
|
|
cmp #$d0 ; turbo or normal? ;
|
| 470 |
|
|
.if cs ; ;
|
| 471 |
|
|
lda #2 ; turbo! :-) ;
|
| 472 |
|
|
.else ; ;
|
| 473 |
|
|
lda #1 ; normal :-( ;
|
| 474 |
|
|
.end ; ;
|
| 475 |
|
|
sta Crystal ; ;
|
| 476 |
|
|
lda #0 ; ;
|
| 477 |
|
|
sta ACIA0+A_SR ; ;
|
| 478 |
|
|
sta ACIA0+A_CTRL ; reset UART ;
|
| 479 |
|
|
sta ACIA0+A_CMD ; ;
|
| 480 |
|
|
;
|
| 481 |
|
|
jmp LOOP ;
|
| 482 |
|
|
;
|
| 483 |
|
|
; ;
|
| 484 |
|
|
;-----------------------------------------------------------------------;
|
| 485 |
|
|
; ;
|
| 486 |
|
|
; The Real Thing: ;
|
| 487 |
|
|
; ;
|
| 488 |
|
|
LOOP DO_SLOW ; do non-critical things ;
|
| 489 |
|
|
jsr do_input ; check for received data
|
| 490 |
|
|
DO_PORT 0
|
| 491 |
|
|
jsr do_input
|
| 492 |
|
|
DO_PORT 1
|
| 493 |
|
|
jsr do_input
|
| 494 |
|
|
DO_PORT 2
|
| 495 |
|
|
jsr do_input
|
| 496 |
|
|
DO_PORT 3
|
| 497 |
|
|
jsr do_input
|
| 498 |
|
|
DO_PORT 4
|
| 499 |
|
|
jsr do_input
|
| 500 |
|
|
DO_PORT 5
|
| 501 |
|
|
jsr do_input
|
| 502 |
|
|
DO_PORT 6
|
| 503 |
|
|
jsr do_input
|
| 504 |
|
|
jmp LOOP
|
| 505 |
|
|
|
| 506 |
|
|
|
| 507 |
|
|
do_input DO_DATA 0
|
| 508 |
|
|
DO_DATA 1
|
| 509 |
|
|
DO_DATA 2
|
| 510 |
|
|
DO_DATA 3
|
| 511 |
|
|
DO_DATA 4
|
| 512 |
|
|
DO_DATA 5
|
| 513 |
|
|
DO_DATA 6
|
| 514 |
|
|
rts
|
| 515 |
|
|
|
| 516 |
|
|
|
| 517 |
|
|
;-----------------------------------------------------------------------;
|
| 518 |
|
|
section vectors,data,$3ffa
|
| 519 |
|
|
dw $d0d0
|
| 520 |
|
|
dw R_RESET
|
| 521 |
|
|
dw $c0ce
|
| 522 |
|
|
;-----------------------------------------------------------------------;
|
| 523 |
|
|
|
| 524 |
|
|
|
| 525 |
|
|
|
| 526 |
|
|
end
|
| 527 |
|
|
|
| 528 |
|
|
|
| 529 |
|
|
|
