task_test4.c

TI OMAP 1510上mcbsp的驱动程序

/*
 * dspapps/dsp/task_testB/task_test4.c
 *
 * DSP task example: active block send
 *
 * Copyright (C) 2002,2003 Nokia Corporation
 *
 * Written by Toshihiro Kobayashi <[e-mail]>
 *
 * 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
 *
 * $Id: task_test4.c
 * $Revision: 2.0
 * $Date: 2003/11/11
 *
 */
#include <std.h>
#include "mailbox.h"
#include "tokliBIOS.h"

static Uns	t4_rcv_wdsnd(struct dsptask *task, Uns data);

struct dsptask task_test4 = {
	TID_MAGIC,	// tid
	"test4",	// name
	MBCMD_TTYP_BKDM | MBCMD_TTYP_ASND,
			// ttyp: active block snd, passive word rcv
	t4_rcv_wdsnd,	// rcv_snd
	NULL,		// rcv_req
	NULL,		// rcv_tctl
	NULL		// tsk_attrs
};

static Uns t4_rcv_wdsnd(struct dsptask *task, Uns data)
{
	Uns	bid;
	Int	ipbuf_trycnt = 0;
	Int	i, j, k;
	Uns	*p;

	for(i=0; i<data; i++) {
		ipbuf_trycnt = 0;
		do {
			bid = get_free_ipbuf(task);
			if(bid != MBCMD_BID_NULL) // valid bid
				break;
			if(++ipbuf_trycnt >= 100)
				return MBCMD_EID_STVBUF;
			for(j=0; j<100; j++); // wait
		} while(1);
		p = ipbuf_d[bid];
		for(j=0; j<4; j++) {
			for(k=0; k<30; k++) {
				*(p++) = 0x4141+0x0101*j;
			}
			*(p++) = 0x0a00 | (0x30 + (i&0x07));
		}
		bksnd(task, bid, 124);
	}
	return 0;
}