/*
    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

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

#include "chrtclib.h"

RTCTime timespec;
RTCAlarm alarmspec;

#define TEST_ALARM_WAKEUP FALSE


#if TEST_ALARM_WAKEUP

/* sleep indicator thread */
static WORKING_AREA(blinkWA, 128);
static msg_t blink_thd(void *arg){
  (void)arg;
  while (TRUE) {
    chThdSleepMilliseconds(100);
    palTogglePad(GPIOC, GPIOC_LED);
  }
  return 0;
}

int main(void) {
  halInit();
  chSysInit();

  chThdCreateStatic(blinkWA, sizeof(blinkWA), NORMALPRIO, blink_thd, NULL);
  /* set alarm in near future */
  rtcGetTime(&RTCD1, &timespec);
  alarmspec.tv_sec = timespec.tv_sec + 30;
  rtcSetAlarm(&RTCD1, 0, &alarmspec);

  while (TRUE){
    chThdSleepSeconds(10);
    chSysLock();

    /* going to anabiosis*/
    PWR->CR |= (PWR_CR_PDDS | PWR_CR_LPDS | PWR_CR_CSBF | PWR_CR_CWUF);
    SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
    __WFI();
  }
  return 0;
}

#else /* TEST_ALARM_WAKEUP */

/* Manually reloaded test alarm period.*/
#define RTC_ALARMPERIOD   10

BinarySemaphore alarm_sem;

static void my_cb(RTCDriver *rtcp, rtcevent_t event) {

  (void)rtcp;

  switch (event) {
  case RTC_EVENT_OVERFLOW:
    palTogglePad(GPIOC, GPIOC_LED);
    break;
  case RTC_EVENT_SECOND:
    /* palTogglePad(GPIOC, GPIOC_LED); */
    break;
  case RTC_EVENT_ALARM:
    palTogglePad(GPIOC, GPIOC_LED);
    chSysLockFromIsr();
    chBSemSignalI(&alarm_sem);
    chSysUnlockFromIsr();
    break;
  }
}

int main(void) {
  msg_t status = RDY_TIMEOUT;

  halInit();
  chSysInit();
  chBSemInit(&alarm_sem, TRUE);

  rtcGetTime(&RTCD1, &timespec);
  alarmspec.tv_sec = timespec.tv_sec + RTC_ALARMPERIOD;
  rtcSetAlarm(&RTCD1, 0, &alarmspec);

  rtcSetCallback(&RTCD1, my_cb);
  while (TRUE){

    /* Wait until alarm callback signaled semaphore.*/
    status = chBSemWaitTimeout(&alarm_sem, S2ST(RTC_ALARMPERIOD + 5));

    if (status == RDY_TIMEOUT){
      chSysHalt();
    }
    else{
      rtcGetTime(&RTCD1, &timespec);
      alarmspec.tv_sec = timespec.tv_sec + RTC_ALARMPERIOD;
      rtcSetAlarm(&RTCD1, 0, &alarmspec);
    }
  }
  return 0;
}
#endif /* TEST_ALARM_WAKEUP */