2000-05-06 21:34:20 +02:00
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;
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; File:
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; serial.asm
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; Description:
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; Serial device driver
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;
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; Copyright (c) 1998
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; Pasquale J. Villani
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; All Rights Reserved
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;
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; This file is part of DOS-C.
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;
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; DOS-C is free software; you can redistribute it and/or
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; modify it under the terms of the GNU General Public License
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; as published by the Free Software Foundation; either version
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; 2, or (at your option) any later version.
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;
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; DOS-C is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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; the GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public
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; License along with DOS-C; see the file COPYING. If not,
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; write to the Free Software Foundation, 675 Mass Ave,
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; Cambridge, MA 02139, USA.
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;
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; $Header$
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;
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; $Log$
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2000-05-25 22:56:23 +02:00
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; Revision 1.3 2000/05/25 20:56:21 jimtabor
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; Fixed project history
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;
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2000-05-08 06:30:00 +02:00
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; Revision 1.2 2000/05/08 04:30:00 jimtabor
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; Update CVS to 2020
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2000-05-06 21:34:20 +02:00
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;
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2000-05-25 22:56:23 +02:00
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; Revision 1.1.1.1 2000/05/06 19:34:53 jhall1
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; The FreeDOS Kernel. A DOS kernel that aims to be 100% compatible with
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; MS-DOS. Distributed under the GNU GPL.
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;
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2000-05-06 21:34:20 +02:00
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; Revision 1.2 1999/08/10 17:57:13 jprice
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; ror4 2011-02 patch
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;
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; Revision 1.1.1.1 1999/03/29 15:41:31 jprice
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; New version without IPL.SYS
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;
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; Revision 1.1 1999/02/08 05:55:57 jprice
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; Added Pat's 1937 kernel patches
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;
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; $EndLog$
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;
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%include "io.inc"
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segment _IO_FIXED_DATA
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global ComTable
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ComTable db 0Ah
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dw _IOExit
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dw _IOExit
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dw _IOExit
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dw _IOCommandError
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dw ComRead
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dw ComNdRead
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dw _IOExit
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dw ComInpFlush
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dw ComWrite
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dw ComWrite
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dw ComOutStat
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segment _IO_TEXT
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extern CommonNdRdExit:wrt TGROUP
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ComRead:
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jcxz ComRd3
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call GetComStat
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xor ax,ax
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xchg [bx],al
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or al,al
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jnz ComRd2
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ComRd1:
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call BiosRdCom
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ComRd2:
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stosb
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loop ComRd1
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ComRd3:
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jmp _IOExit
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BiosRdCom:
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mov ah,2
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call ComIOCall
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test ah,0Eh
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jz BiosRdRetn
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add sp,byte 2
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xor al,al
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or al,0B0h
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jmp _IOErrCnt
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BiosRdRetn:
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retn
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ComNdRead:
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call GetComStat
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mov al,[bx]
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or al,al
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jnz ComNdRd1
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call ComRdStatus
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test ah,1
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jz ComNdRtn
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test al,20h
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jz ComNdRtn
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call BiosRdCom
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call GetComStat
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mov [bx],al
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ComNdRd1:
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jmp CommonNdRdExit
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ComNdRtn:
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jmp _IODone
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ComOutStat:
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call ComRdStatus
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test al,20h
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jz ComNdRtn
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test ah,20h
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jz ComNdRtn
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jmp _IOExit
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ComRdStatus:
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mov ah,3
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call ComIOCall
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retn
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ComIOCall:
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call GetUnitNum
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int 14h ; RS-232 get char al, ah=return status
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retn
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ComInpFlush:
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call GetComStat
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mov byte [bx],0
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jmp _IOExit
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ComWrite:
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jcxz ComRd3
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ComWr1:
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mov al,[es:di]
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inc di
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mov ah,1
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call ComIOCall
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test ah,80h
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jz ComWr2
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mov al,0Ah
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jmp _IOErrCnt
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ComWr2:
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loop ComWr1
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jmp _IOExit
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GetComStat:
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call GetUnitNum
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mov bx,dx
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add bx,ComStatArray
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retn
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segment _DATA
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ComStatArray db 0, 0, 0, 0
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