2012-10-15 02:08:06 +02:00
|
|
|
;
|
|
|
|
|
; File:
|
|
|
|
|
; serial.asm
|
|
|
|
|
; Description:
|
|
|
|
|
; Serial device driver
|
|
|
|
|
;
|
|
|
|
|
; Copyright (c) 1998
|
|
|
|
|
; Pasquale J. Villani
|
|
|
|
|
; All Rights Reserved
|
|
|
|
|
;
|
|
|
|
|
; This file is part of DOS-C.
|
|
|
|
|
;
|
|
|
|
|
; DOS-C is free software; you can redistribute it and/or
|
|
|
|
|
; modify it under the terms of the GNU General Public License
|
|
|
|
|
; as published by the Free Software Foundation; either version
|
|
|
|
|
; 2, or (at your option) any later version.
|
|
|
|
|
;
|
|
|
|
|
; DOS-C is distributed in the hope that it will be useful, but
|
|
|
|
|
; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
|
|
|
|
; the GNU General Public License for more details.
|
|
|
|
|
;
|
|
|
|
|
; You should have received a copy of the GNU General Public
|
|
|
|
|
; License along with DOS-C; see the file COPYING. If not,
|
|
|
|
|
; write to the Free Software Foundation, 675 Mass Ave,
|
|
|
|
|
; Cambridge, MA 02139, USA.
|
|
|
|
|
;
|
|
|
|
|
; $Header$
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
%include "io.inc"
|
|
|
|
|
|
|
|
|
|
segment _IO_FIXED_DATA
|
|
|
|
|
|
|
|
|
|
global ComTable
|
|
|
|
|
ComTable db 0Ah
|
|
|
|
|
dw _IOExit
|
|
|
|
|
dw _IOExit
|
|
|
|
|
dw _IOExit
|
|
|
|
|
dw _IOCommandError
|
|
|
|
|
dw ComRead
|
|
|
|
|
dw ComNdRead
|
|
|
|
|
dw ComInStat
|
|
|
|
|
dw ComInpFlush
|
|
|
|
|
dw ComWrite
|
|
|
|
|
dw ComWrite
|
|
|
|
|
dw ComOutStat
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
segment _IO_TEXT
|
|
|
|
|
|
2017-12-19 14:22:58 +01:00
|
|
|
extern CommonNdRdExit
|
2012-10-15 02:08:06 +02:00
|
|
|
|
|
|
|
|
ComRead:
|
|
|
|
|
jcxz ComRd3
|
|
|
|
|
call GetComStat
|
|
|
|
|
xor ax,ax
|
|
|
|
|
xchg [bx],al
|
|
|
|
|
or al,al
|
|
|
|
|
jnz ComRd2
|
|
|
|
|
ComRd1:
|
|
|
|
|
call BiosRdCom
|
|
|
|
|
or ah,ah ; timeout?
|
|
|
|
|
js ComRd1 ; yes, try again
|
|
|
|
|
ComRd2:
|
|
|
|
|
stosb
|
|
|
|
|
loop ComRd1
|
|
|
|
|
|
|
|
|
|
ComRd3:
|
|
|
|
|
jmp _IOExit
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
BiosRdCom:
|
|
|
|
|
mov ah,2
|
|
|
|
|
call ComIOCall
|
|
|
|
|
test ah,0Eh
|
|
|
|
|
jz BiosRdRetn
|
|
|
|
|
add sp,byte 2
|
|
|
|
|
xor al,al
|
|
|
|
|
or al,0B0h
|
|
|
|
|
jmp _IOErrCnt
|
|
|
|
|
BiosRdRetn:
|
|
|
|
|
retn
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ComInStat: ; similar to ComNdRead but returns no char, only flags
|
|
|
|
|
call GetComStat
|
|
|
|
|
mov al,[bx]
|
|
|
|
|
or al,al
|
|
|
|
|
jnz ComInAvail
|
|
|
|
|
call ComRdStatus
|
|
|
|
|
test ah,1 ; char waiting
|
|
|
|
|
jz ComNdRtn
|
|
|
|
|
; test al,20h ; DSR (why do we test this?)
|
|
|
|
|
; jz ComNdRtn
|
|
|
|
|
ComInAvail: jmp _IOExit ; return "ready"
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ComNdRead:
|
|
|
|
|
call GetComStat
|
|
|
|
|
mov al,[bx]
|
|
|
|
|
or al,al
|
|
|
|
|
jnz ComNdRd1
|
|
|
|
|
call ComRdStatus
|
|
|
|
|
test ah,1 ; char waiting
|
|
|
|
|
jz ComNdRtn
|
|
|
|
|
; test al,20h ; DSR (why do we test this?)
|
|
|
|
|
; jz ComNdRtn
|
|
|
|
|
call BiosRdCom
|
|
|
|
|
call GetComStat
|
|
|
|
|
mov [bx],al
|
|
|
|
|
ComNdRd1:
|
|
|
|
|
jmp CommonNdRdExit ; return that char
|
|
|
|
|
ComNdRtn:
|
|
|
|
|
jmp _IODone ; return "busy"
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ComOutStat:
|
|
|
|
|
call ComRdStatus
|
|
|
|
|
test al,20h
|
|
|
|
|
jz ComNdRtn
|
|
|
|
|
test ah,20h
|
|
|
|
|
jz ComNdRtn
|
|
|
|
|
jmp _IOExit ; return "ready"
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ComRdStatus:
|
|
|
|
|
mov ah,3
|
|
|
|
|
call ComIOCall
|
|
|
|
|
retn
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ComIOCall:
|
|
|
|
|
call GetUnitNum
|
|
|
|
|
int 14h ; RS-232 get char al, ah=return status
|
|
|
|
|
retn
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ComInpFlush:
|
|
|
|
|
call GetComStat
|
|
|
|
|
mov byte [bx],0
|
|
|
|
|
jmp _IOExit
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ComWrite:
|
|
|
|
|
jcxz ComRd3
|
|
|
|
|
ComWr1:
|
|
|
|
|
mov al,[es:di]
|
|
|
|
|
inc di
|
|
|
|
|
mov ah,1
|
|
|
|
|
call ComIOCall
|
|
|
|
|
test ah,80h
|
|
|
|
|
jz ComWr2
|
|
|
|
|
mov al,0Ah
|
|
|
|
|
jmp _IOErrCnt
|
|
|
|
|
ComWr2:
|
|
|
|
|
loop ComWr1
|
|
|
|
|
jmp _IOExit
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
GetComStat:
|
|
|
|
|
call GetUnitNum
|
|
|
|
|
mov bx,dx
|
|
|
|
|
add bx,ComStatArray
|
|
|
|
|
retn
|
|
|
|
|
|
|
|
|
|
segment _DATA
|
|
|
|
|
|
|
|
|
|
ComStatArray db 0, 0, 0, 0
|
|
|
|
|
|
|
|
|
|
; Revision 1.2 1999/08/10 17:57:13 jprice
|
|
|
|
|
; ror4 2011-02 patch
|
|
|
|
|
;
|
|
|
|
|
; Revision 1.1.1.1 1999/03/29 15:41:31 jprice
|
|
|
|
|
; New version without IPL.SYS
|
|
|
|
|
;
|
|
|
|
|
; Revision 1.1 1999/02/08 05:55:57 jprice
|
|
|
|
|
; Added Pat's 1937 kernel patches
|
|
|
|
|
;
|
|
|
|
|
; EndLog
|
|
|
|
|
;
|
