avr_watchdog.h

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/*
 *  avr_watchdog.h
 * 
 *  Copyright 2008, 2009 Michel Pollet <buserror@gmail.com>
 * 
 *  This file is part of simavr.
 * 
 *  simavr 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 3 of the
 *  License, or (at your option) any later version.
 * 
 *  simavr 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 simavr.  If not, see
 *  <http://www.gnu.org/licenses/>.
 */

#ifndef __AVR_WATCHDOG_H___
#define __AVR_WATCHDOG_H___

#ifdef __cplusplus
extern "C"
{
#endif

#include "sim_avr.h"

  typedef struct avr_watchdog_t
  {
    avr_io_t io;

    avr_regbit_t wdrf;   

    avr_regbit_t wdce;   
    avr_regbit_t wde;   
    avr_regbit_t wdp[4];   

    avr_int_vector_t watchdog;   

    avr_cycle_count_t cycle_count;

    struct
    {
      uint8_t wdrf;   
      avr_run_t avr_run;   
    } reset_context;
  } avr_watchdog_t;

  /* takes no parameter */
#define AVR_IOCTL_WATCHDOG_RESET AVR_IOCTL_DEF('w','d','t','r')

  void avr_watchdog_init (avr_t * avr, avr_watchdog_t * p);

#define AVR_WATCHDOG_DECLARE(_WDSR, _vec)               \
  .watchdog = {                             \
    .wdrf = AVR_IO_REGBIT(MCUSR, WDRF),                 \
    .wdce = AVR_IO_REGBIT(_WDSR, WDCE),                 \
    .wde = AVR_IO_REGBIT(_WDSR, WDE),                   \
    .wdp = { AVR_IO_REGBIT(_WDSR, WDP0),AVR_IO_REGBIT(_WDSR, WDP1), \
         AVR_IO_REGBIT(_WDSR, WDP2),AVR_IO_REGBIT(_WDSR, WDP3) },   \
    .watchdog = {                           \
      .enable = AVR_IO_REGBIT(_WDSR, WDIE),             \
      .raised = AVR_IO_REGBIT(_WDSR, WDIF),             \
      .vector = _vec,                           \
    },                                  \
  }

  /* no WDP3, WDIE, WDIF in atmega128 */
  /* MCUSR is called MCUCSR in atmega128 */
#define AVR_WATCHDOG_DECLARE_128(_WDSR, _vec)               \
  .watchdog = {                             \
  .wdrf = AVR_IO_REGBIT(MCUCSR, WDRF),                  \
    .wdce = AVR_IO_REGBIT(_WDSR, WDCE),                 \
    .wde = AVR_IO_REGBIT(_WDSR, WDE),                   \
    .wdp = { AVR_IO_REGBIT(_WDSR, WDP0),AVR_IO_REGBIT(_WDSR, WDP1), \
    AVR_IO_REGBIT(_WDSR, WDP2) },                   \
    .watchdog = {                           \
  .enable = AVR_IO_REGBIT(_WDSR, 6),                    \
    .raised = AVR_IO_REGBIT(_WDSR, 7),                  \
    .vector = _vec,                         \
    },                                  \
    }

#ifdef __cplusplus
};
#endif

#endif /* __AVR_WATCHDOG_H___ */