Subversion Repositories sockit_owm

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

*                                                                             *

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

* Copyright (C) 2010  Iztok Jeras                                             *

* Since the code is based on an Altera app note, I kept their license.        *

*                                                                             *

* 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.                         *

*                                                                             *

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *

* 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.              *

*                                                                             *

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

#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 1-wire cycle locking

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

          ALT_SEM_CREATE  (sockit_owm.cyc, 1);

  if (!error) {

    // enable interrupt

    sockit_owm.ien = 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 1-wire cycle

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

}

#else

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

// polling implementation

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

#endif