task_test1.c

TI OMAP 1510上mcbsp的驱动程序

/*
 * dspapps/dsp/task_testB/task_test1.c
 *
 * DSP task example: word send / word receive
 *
 * 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_test1.c
 * $Revision: 2.0
 * $Date: 2003/11/11
 *
 */
#include <std.h>
#include "mailbox.h"
#include "tokliBIOS.h"

static Uns	t1_rcv_wdsnd(struct dsptask *task, Uns data);
static Uns	t1_rcv_wdreq(struct dsptask *task);
static Uns	t1_rcv_tctl(struct dsptask *task, Uns ctlcmd);

struct task_t1 {
	struct dsptask	task_head;
	Int	wdwptr, wdrptr;
	Uns	wddata[64];
};

struct task_t1 task_test1 = {
	{
		TID_MAGIC,	// tid
		"test1",	// name
		0x0,		// ttyp: passive word snd, passive word rcv
		t1_rcv_wdsnd,	// rcv_snd
		t1_rcv_wdreq,	// rcv_req
		t1_rcv_tctl,	// rcv_tctl
		NULL		// tsk_attrs
	},
};

static Uns t1_rcv_wdsnd(struct dsptask *task, Uns data)
{
	struct task_t1	*task_t1 = (struct task_t1*)task;

	task_t1->wddata[task_t1->wdwptr] = data;
	if(task_t1->wdwptr < 64)
		task_t1->wdwptr++;

	return 0;
}

static Uns t1_rcv_wdreq(struct dsptask *task)
{
	struct task_t1	*task_t1 = (struct task_t1*)task;

	if(task_t1->wdwptr == 0)
		return 0;
	wdsnd(task, task_t1->wddata[task_t1->wdrptr++]);
	if(task_t1->wdrptr == task_t1->wdwptr)
		task_t1->wdrptr = 0;
	
	return 0;
}

static Uns t1_rcv_tctl(struct dsptask *task, Uns ctlcmd)
{
	struct task_t1	*task_t1 = (struct task_t1*)task;

	switch(ctlcmd) {
		case MBCMD_TCTL_TINIT:
			task_t1->wdwptr = 0;
			task_t1->wdrptr = 0;
			return 0;
		default:
			return MBCMD_EID_BADTCTL;
	}
}