task_test6.c

TI OMAP 1510上mcbsp的驱动程序

/*
 * dspapps/dsp/task_testB/task_test6.c
 *
 * DSP task example: active block 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_test6.c
 * $Revision: 2.0
 * $Date: 2003/11/11
 *
 */
#include <std.h>
#include <mem.h>
#include "mailbox.h"
#include "tokliBIOS.h"

static Uns	t6_rcv_bksnd(struct dsptask *task, Uns bid, Uns cnt);
static Uns	t6_rcv_tctl(struct dsptask *task, Uns ctlcmd);
static Uns	t6_snd_bkreq(struct dsptask *task);


struct task_t6 {
	struct dsptask	task_head;
	Void	*t1q_id;
	Int	waiting;
	Int	req_cnt;
};

struct task_t6 task_test6 = {
	{
		TID_MAGIC,	// tid
		"test6",	// name
		MBCMD_TTYP_BKDM | MBCMD_TTYP_BKMD |
		MBCMD_TTYP_ASND | MBCMD_TTYP_AREQ,
				// ttyp: active block snd, active block rcv
		t6_rcv_bksnd,	// rcv_snd
		NULL,		// rcv_req
		t6_rcv_tctl,	// rcv_tctl
		NULL		// tsk_attrs
	},
	MEM_ILLEGAL, // t1q_id
};

static Uns t6_rcv_bksnd(struct dsptask *task, Uns bid, Uns cnt)
{
	struct task_t6	*task_t6 = (struct task_t6*)task;

	bksnd(task, bid, cnt); // echo back
	task_t6->waiting = 0;

	return 0;
}

static Uns t6_rcv_tctl(struct dsptask *task, Uns ctlcmd)
{
	struct task_t6	*task_t6 = (struct task_t6*)task;

	switch(ctlcmd) {
		case MBCMD_TCTL_TEN:
			if(task_t6->t1q_id != MEM_ILLEGAL) // already registered
				return 0;
			task_t6->req_cnt = 1;
			task_t6->t1q_id = register_tq_1s(task, t6_snd_bkreq);
			if(task_t6->t1q_id == MEM_ILLEGAL)
				return MBCMD_EID_NORES;
			task_t6->waiting = 0;
			return 0;
		case MBCMD_TCTL_TDIS:
			unregister_tq_1s(task, task_t6->t1q_id);
			task_t6->t1q_id = MEM_ILLEGAL;
			return 0;
		default:
			return MBCMD_EID_BADTCTL;
	}
}

static Uns t6_snd_bkreq(struct dsptask *task)
{
	struct task_t6	*task_t6 = (struct task_t6*)task;

	if(!task_t6->waiting) {
		bkreq(task, task_t6->req_cnt);
		task_t6->req_cnt++;
	}
	task_t6->waiting = 1;
	return 0;
}