parallel.c

来自「PXA250上的XBOOT」· C语言 代码 · 共 98 行

/* 
 * $Id: parallel.c,v 1.3 2003/09/24 12:13:35 jfabo Exp $
 *
 * Copyright (C) 2001, 2002 ETC s.r.o.
 *
 * This program 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
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * Written by Marcel Telka <[e-mail]>, 2001, 2002.
 *
 */

#include <_windows.h>
#include <nkintr.h>

#include "except.h"
#include "parport.h"
#include "download.h"
#include "format.h"

static void
PP_writechar( char c )
{
	OEMParallelPortSendByte( c );
}

static char
PP_read( unsigned char *buff, int len )
{
	int i;
	
	for (i = 0; i < len; i++) {
		buff[i] = (unsigned char)OEMParallelPortGetByte();
		if (buff[i] < 0)
			Throw E_READTIMEOUT;
	}
	return 1;
}

/* 
 * PP_download - download .bin image via parallel port
 * returns: 0 for ok, -1 for download error, -2 for download timeout
 */
int
PP_download( struct imginfo *img )
{
	int i;
	struct fntable fn = {
		PP_writechar,
		PP_read
	};

	EdbgOutputDebugString( "Ready to download image via parallel\n" );

	/* first try MSCEPB protocol. */
	PP_Protocol = PP_PROTOCOL_EPP;

	for (i = 0; i < 4; i++) {

		/* try all supported protocols (MSCEPB, EPP) in cycle */
		switch (PP_Protocol) {
			case PP_PROTOCOL_MSCEPB:
				PP_Protocol = PP_PROTOCOL_EPP;
				break;
			case PP_PROTOCOL_EPP:
			default:
				PP_Protocol = PP_PROTOCOL_MSCEPB;
		}

		EdbgOutputDebugString( "." );

		NoPPFS = FALSE;

		Try {
			download( &fn, img, PP_Protocol == PP_PROTOCOL_EPP );
		}
		Catch_anonymous {
			continue;
		};
		return 0;
	}

	EdbgOutputDebugString( "\nFail to synchonize with the host\n" );
	return -2;
}