/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012,2013 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    LPC8xx/ext_lld_isr.c
 * @brief   LPC8xx EXT subsystem low level driver ISR code.
 *
 * @addtogroup EXT
 * @{
 */

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

#if HAL_USE_EXT || defined(__DOXYGEN__)

#include "ext_lld_isr.h"

/*===========================================================================*/
/* Driver local definitions.                                                 */
/*===========================================================================*/

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

/*===========================================================================*/
/* Driver local variables and types.                                         */
/*===========================================================================*/

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

/*===========================================================================*/
/* Driver interrupt handlers.                                                */
/*===========================================================================*/
static void ext_lld_interrupt( uint32_t n ) {
  uint32_t reason;
  
  reason =  ((LPC_PIN_INT->RISE)>> n   ) & 0x01;
  reason |= ((LPC_PIN_INT->FALL)>>(n-1)) & 0x02;
  LPC_PIN_INT->RISE = (1<<n);
  LPC_PIN_INT->FALL = (1<<n);
  LPC_PIN_INT->IST  = (1<<n);
  EXTD1.config->channels[n].cb(&EXTD1, n, reason);
}

/**
 * @brief   EXT[0] interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(VectorA0) {

  CH_IRQ_PROLOGUE();
  ext_lld_interrupt(0);
  CH_IRQ_EPILOGUE();
}

/**
 * @brief   EXT[1] interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(VectorA4) {

  CH_IRQ_PROLOGUE();
  ext_lld_interrupt(1);
  CH_IRQ_EPILOGUE();
}

/**
 * @brief   EXT[2] interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(VectorA8) {

  CH_IRQ_PROLOGUE();
  ext_lld_interrupt(2);
  CH_IRQ_EPILOGUE();
}

/**
 * @brief   EXT[3] interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(VectorAC) {

  CH_IRQ_PROLOGUE();
  ext_lld_interrupt(3);
  CH_IRQ_EPILOGUE();
}

/**
 * @brief   EXT[4] interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(VectorB0) {

  CH_IRQ_PROLOGUE();
  ext_lld_interrupt(4);
  CH_IRQ_EPILOGUE();
}

/**
 * @brief   EXT[5] interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(VectorB4) {

  CH_IRQ_PROLOGUE();
  ext_lld_interrupt(5);
  CH_IRQ_EPILOGUE();
}

/**
 * @brief   EXT[6] interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(VectorB8) {

  CH_IRQ_PROLOGUE();
  ext_lld_interrupt(6);
  CH_IRQ_EPILOGUE();
}

/**
 * @brief   EXT[7] interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(VectorBC) {

  CH_IRQ_PROLOGUE();
  ext_lld_interrupt(7);
  CH_IRQ_EPILOGUE();
}

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/
static const uint8_t LPC8xx_EXT_EXTIn_IRQ_PRIORITY[] =
    { LPC8xx_EXT_EXTI0_IRQ_PRIORITY,
      LPC8xx_EXT_EXTI1_IRQ_PRIORITY,
      LPC8xx_EXT_EXTI2_IRQ_PRIORITY,
      LPC8xx_EXT_EXTI3_IRQ_PRIORITY,
      LPC8xx_EXT_EXTI4_IRQ_PRIORITY,
      LPC8xx_EXT_EXTI5_IRQ_PRIORITY,
      LPC8xx_EXT_EXTI6_IRQ_PRIORITY,
      LPC8xx_EXT_EXTI7_IRQ_PRIORITY };

/**
 * @brief   Enables EXTI IRQ sources.
 *
 * @notapi
 */
void ext_lld_exti_irq_enable( uint32_t exti_n ) {

  nvicEnableVector(PININT0_IRQn + exti_n,
                   CORTEX_PRIORITY_MASK(LPC8xx_EXT_EXTIn_IRQ_PRIORITY[exti_n]));
}

/**
 * @brief   Disables EXTI IRQ sources.
 *
 * @notapi
 */
void ext_lld_exti_irq_disable( uint32_t exti_n ) {

  nvicDisableVector(PININT0_IRQn + exti_n);
}

#endif /* HAL_USE_EXT */

/** @} */