Subversion Repositories sockit_owm

/******************************************************************************

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2008 Altera Corporation, San Jose, California, USA.           *

* All rights reserved.                                                        *

*                                                                             *

* Permission is hereby granted, free of charge, to any person obtaining a     *

* copy of this software and associated documentation files (the "Software"),  *

* to deal in the Software without restriction, including without limitation   *

* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *

* and/or sell copies of the Software, and to permit persons to whom the       *

* Software is furnished to do so, subject to the following conditions:        *

*                                                                             *

* The above copyright notice and this permission notice shall be included in  *

* all copies or substantial portions of the Software.                         *

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* DEALINGS IN THE SOFTWARE.                                                   *

*                                                                             *

* This agreement shall be governed in all respects by the laws of the State   *

* of California and by the laws of the United States of America.              *

*                                                                             *

******************************************************************************/

//////////////////////////////////////////////////////////////////////////////

//                                                                          //

//  Minimalistic 1-wire (onewire) master with Avalon MM bus interface       //

//                                                                          //

//  Copyright (C) 2010  Iztok Jeras                                         //

//                                                                          //

//////////////////////////////////////////////////////////////////////////////

//                                                                          //

//  This program is free software: you can redistribute it and/or modify    //

//  it under the terms of the GNU Lesser General Public License             //

//  as published by the Free Software Foundation, either                    //

//  version 3 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, see <http://www.gnu.org/licenses/>.   //

//                                                                          //

//////////////////////////////////////////////////////////////////////////////

#include <fcntl.h>

#include "sys/alt_dev.h"

#include "sys/alt_irq.h"

#include "sys/ioctl.h"

#include "sys/alt_errno.h"

#include "sockit_owm_regs.h"

#include "sockit_owm.h"

extern sockit_owm_state sockit_owm;

#ifndef SOCKIT_OWM_POLLING

//////////////////////////////////////////////////////////////////////////////

// interrupt implementation

//////////////////////////////////////////////////////////////////////////////

#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT

static void sockit_owm_irq ();

#else

static void sockit_owm_irq (alt_u32 id);

#endif

void sockit_owm_init (alt_u32 irq)

{

  int error;

  // initialize semaphore for transfer locking

  // TODO there is a warning to fix here

  error = ALT_FLAG_CREATE (sockit_owm.irq, 0) ||

          ALT_SEM_CREATE  (sockit_owm.trn, 1);

  if (!error) {

    // enable TX interrupt, RX is unused

    sockit_owm.ena = 0x1;

    // register the interrupt handler

#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT

    alt_ic_isr_register (0, irq, sockit_owm_irq, NULL, 0x0);

#else

    alt_irq_register (irq, NULL, sockit_owm_irq);

#endif

  }

}

#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT

static void sockit_owm_irq(void * state)

#else

static void sockit_owm_irq(void * state, alt_u32 id)

#endif

{

  // clear onewire interrupts

  IORD_SOCKIT_OWM (sockit_owm.base);

  // set the flag indicating a completed transfer

  ALT_FLAG_POST (sockit_owm.irq, 0x1, OS_FLAG_SET);

}

#else

//////////////////////////////////////////////////////////////////////////////

// polling implementation

//////////////////////////////////////////////////////////////////////////////

#endif