task_test8.c

TI OMAP 1510上mcbsp的驱动程序

/*
 * dspapps/dsp/task_testB/task_test8.c
 *
 * DSP task example: parallel task / priority control
 *
 * 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_test8.c
 * $Revision: 2.0
 * $Date: 2003/11/11
 *
 */
#include <std.h>
#include <sem.h>
#include <tsk.h>
#include "mailbox.h"
#include "tokliBIOS.h"

extern Int	strcpy16to8(Char *d, Char *s);

static Uns	t8_rcv_wdsnd(struct dsptask *task, Uns data);

struct task_t8 {
	struct dsptask	task_head;
	char	*s;
	LgUns	interval;
};

/*
 * task 8a: normal priority
 */
struct task_t8 task_test8a = {
	{
		TID_MAGIC,	// tid
		"test8a",	// name
		MBCMD_TTYP_BKDM | MBCMD_TTYP_ASND,
				// ttyp: active block snd, passive word rcv
		t8_rcv_wdsnd,	// rcv_snd
		NULL,		// rcv_req
		NULL,		// rcv_tctl
		NULL		// tsk_attrs
	},
	"Hello from task8a! *   \n",	// s
	520000L				// interval
};

/*
 * task 8b: normal priority
 */
struct task_t8 task_test8b = {
	{
		TID_MAGIC,	// tid
		"test8b",	// name
		MBCMD_TTYP_BKDM | MBCMD_TTYP_ASND,
				// ttyp: active block snd, passive word rcv
		t8_rcv_wdsnd,	// rcv_snd
		NULL,		// rcv_req
		NULL,		// rcv_tctl
		NULL		// tsk_attrs
	},
	"Hello from task8b!  *  \n",	// s
	200000L				// interval
};

/*
 * task 8c: high priority
 */
static struct TSK_Attrs	attr_c = {
	DSPTASK_DEFAULT_PRIORITY+1,	// priority
	NULL,				// stack
	DSPTASK_DEFAULT_STACKSIZE,	// stacksize
	DSPTASK_DEFAULT_SYSSTACKSIZE,	// sysstacksize
	0,				// stackseg: can't be overridden
	NULL,				// environ
	NULL,				// name: can't be overridden
	TRUE				// exitflag
};

struct task_t8 task_test8c = {
	{
		TID_MAGIC,	// tid
		"test8c",	// name
		MBCMD_TTYP_BKDM | MBCMD_TTYP_ASND,
				// ttyp: active block snd, passive word rcv
		t8_rcv_wdsnd,	// rcv_snd
		NULL,		// rcv_req
		NULL,		// rcv_tctl
		&attr_c		// tsk_attrs
	},
	"Hello from task8c!   * \n",	// s
	200000L				// interval
};

static Uns t8_rcv_wdsnd(struct dsptask *task, Uns data)
{
	struct task_t8	*task_t8 = (struct task_t8*)task;
	Char	*s = task_t8->s;
	LgUns	interval = task_t8->interval;
	Uns	bid;
	Int	cnt, i;
	LgUns	j;

	for(i=0; i<data; i++) {
		for(j=0; j<interval; j++); // busy wait
		bid = get_free_ipbuf(task);
		if(bid == MBCMD_BID_NULL) {
			return MBCMD_EID_STVBUF;
		}
		cnt = strcpy16to8((Char*)ipbuf_d[bid], s);
		bksnd(task, bid, cnt);
	}

	return 0;
}

// We use same function in hellotimer.c
//
//Int strcpy16to8(Char *d, Char *s) {
//	Int cnt = 0;
//
//	for(; *s; s++, d++) {
//		*d = *s;
//		*d |= *++s << 8;
//		cnt++;
//		if(!*s)
//			return cnt;
//	}
//	*d = '\0';
//	return cnt;
//}