wrdk/testudo/linux-gpib-svn/drivers/gpib/sys/ibwrite.c

/***************************************************************************
                              ibwrite.c
                             -------------------

    copyright            : (C) 2001, 2002 by Frank Mori Hess
    email                : fmhess@users.sourceforge.net
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "gpibP.h"

/*
 * IBWRT
 * Write cnt bytes of data from buf to the GPIB.  The write
 * operation terminates only on I/O complete.
 *
 * NOTE:
 *      1.  Prior to beginning the write, the interface is
 *          placed in the controller standby state.
 *      2.  Prior to calling ibwrt, the intended devices as
 *          well as the interface board itself must be
 *          addressed by calling ibcmd.
 */
int ibwrt(gpib_board_t *board, uint8_t *buf, size_t cnt, int send_eoi, size_t *bytes_written)
{
	int ret = 0;
	int retval;

	if( cnt == 0 )
	{
		printk( "gpib: ibwrt() called with zero length?\n" );
		return 0;
	}

	if( board->master )
	{
		retval = ibgts( board );
		if( retval < 0 ) return retval;
	}
	osStartTimer( board, board->usec_timeout );
	ret = board->interface->write(board, buf, cnt, send_eoi, bytes_written);

	if( io_timed_out( board ) )
		ret = -ETIMEDOUT;

	osRemoveTimer(board);

	return ret;
}