/*
    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/>.
*/


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

static void extcb(EXTDriver *extp, expchannel_t channel) {

  (void)extp;
  (void)channel;

  if (PWR->CSR & PWR_CSR_PVDO){ /* voltage lover than threshold */
    palClearPad(GPIOB, GPIOB_LED4); /* switch off LED*/
  }
  else{
    palSetPad(GPIOB, GPIOB_LED4); /* switch on LED*/
  }
}

/* If you want to monitor only lover (higher) threshold events than set
 * EXT_CH_MODE_RISING_EDGE (EXT_CH_MODE_FALLING_EDGE) respectively. */
static const EXTConfig extcfg = {
  {
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_BOTH_EDGES | EXT_CH_MODE_AUTOSTART, extcb},/* 16 - PVD */
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
   {EXT_CH_MODE_DISABLED, NULL},
  },
  EXT_MODE_EXTI(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
};

/*
 * Application entry point.
 */
int main(void) {

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * Activates the EXT driver 1.
   */
  extStart(&EXTD1, &extcfg);

  while (TRUE) {
    chThdSleepMilliseconds(500);
  }
}