/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT 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.

    ChibiOS/RT 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/>.
*/

/**
 * @file    AVR/pal_lld.c
 * @brief   AVR GPIO low level driver code.
 *
 * @addtogroup PAL
 * @{
 */

#include "ch.h"
#include "hal.h"

#if HAL_USE_PAL || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver exported variables.                                                */
/*===========================================================================*/

/*===========================================================================*/
/* Driver local variables.                                                   */
/*===========================================================================*/

/*===========================================================================*/
/* Driver local functions.                                                   */
/*===========================================================================*/

/*===========================================================================*/
/* Driver interrupt handlers.                                                */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/

/**
 * @brief   AVR GPIO ports configuration.
 * @details GPIO registers initialization.
 *
 * @param[in] config    the AVR ports configuration
 *
 * @notapi
 */
void _pal_lld_init(const PALConfig *config) {

#if defined(PORTA) || defined(__DOXYGEN__)
  PORTA = config->porta.out;
  DDRA = config->porta.dir;
#endif

#if defined(PORTB) || defined(__DOXYGEN__)
  PORTB = config->portb.out;
  DDRB = config->portb.dir;
#endif

#if defined(PORTC) || defined(__DOXYGEN__)
  PORTC = config->portc.out;
  DDRC = config->portc.dir;
#endif

#if defined(PORTD) || defined(__DOXYGEN__)
  PORTD = config->portd.out;
  DDRD = config->portd.dir;
#endif

#if defined(PORTE) || defined(__DOXYGEN__)
  PORTE = config->porte.out;
  DDRE = config->porte.dir;
#endif
}

/**
 * @brief   Pads mode setup.
 * @details This function programs a pads group belonging to the same port
 *          with the specified mode.
 *
 * @param[in] port the port identifier
 * @param[in] mask the group mask
 * @param[in] mode the mode
 *
 * @note This function is not meant to be invoked directly by the application
 *       code.
 * @note @p PAL_MODE_UNCONNECTED is implemented as output as recommended by
 *       the AVR Family User's Guide. Unconnected pads are set to input
 *       with pull-up by default.
 *
 * @notapi
 *
 * TODO: check PAL_MODE_UNCONNECTED mode recommended for AVR
 */
void _pal_lld_setgroupmode(ioportid_t port,
                           ioportmask_t mask,
                           iomode_t mode) {

  switch (mode) {
  case PAL_MODE_RESET:
  case PAL_MODE_INPUT:
    port->dir &= ~mask;
    break;
  case PAL_MODE_INPUT_ANALOG:
    port->dir &= ~mask;
    port->out &= ~mask;
	break;
  case PAL_MODE_UNCONNECTED:
  case PAL_MODE_INPUT_PULLUP:
    port->dir &= ~mask;
    port->out |= mask;
  case PAL_MODE_OUTPUT_PUSHPULL:
    port->dir |= mask;
    break;
  }
}

#endif /* HAL_USE_PAL */

/** @} */