/*
 * Authors (alphabetical order)
 * - Andre Bernet <bernet.andre@gmail.com>
 * - Bertrand Songis <bsongis@gmail.com>
 * - Bryan J. Rentoul (Gruvin) <gruvin@gmail.com>
 * - Cameron Weeks <th9xer@gmail.com>
 * - Erez Raviv
 * - Jean-Pierre Parisy
 * - Karl Szmutny <shadow@privy.de>
 * - Michael Blandford
 * - Michal Hlavinka
 * - Pat Mackenzie
 * - Philip Moss
 * - Rob Thomson
 * - Romolo Manfredini <romolo.manfredini@gmail.com>
 * - Thomas Husterer
 *
 * open9x is based on code named
 * gruvin9x by Bryan J. Rentoul: http://code.google.com/p/gruvin9x/,
 * er9x by Erez Raviv: http://code.google.com/p/er9x/,
 * and the original (and ongoing) project by
 * Thomas Husterer, th9x: http://code.google.com/p/th9x/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program 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.
 *
 */

#include "../open9x.h"

void rtcSetTime(struct gtm * t)
{
  RTC_TimeTypeDef RTC_TimeStruct;
  RTC_DateTypeDef RTC_DateStruct;

  RTC_TimeStruct.RTC_Hours = t->tm_hour;
  RTC_TimeStruct.RTC_Minutes = t->tm_min;
  RTC_TimeStruct.RTC_Seconds = t->tm_sec;
  RTC_DateStruct.RTC_Year = t->tm_year - 100;
  RTC_DateStruct.RTC_Month = t->tm_mon;
  RTC_DateStruct.RTC_Date = t->tm_mday;

  RTC_SetTime(RTC_Format_BCD, &RTC_TimeStruct);
  RTC_SetDate(RTC_Format_BCD, &RTC_DateStruct);
}

void rtc_gettime(struct gtm * t)
{
  RTC_TimeTypeDef RTC_TimeStruct;
  RTC_DateTypeDef RTC_DateStruct;

  RTC_GetTime(RTC_Format_BCD, &RTC_TimeStruct);
  RTC_GetDate(RTC_Format_BCD, &RTC_DateStruct);

  t->tm_hour = RTC_TimeStruct.RTC_Hours;
  t->tm_min  = RTC_TimeStruct.RTC_Minutes;
  t->tm_sec  = RTC_TimeStruct.RTC_Seconds;
  t->tm_year = RTC_DateStruct.RTC_Year + 100;
  t->tm_mon  = RTC_DateStruct.RTC_Month;
  t->tm_mday = RTC_DateStruct.RTC_Date;
}

void rtcInit()
{
  RTC_InitTypeDef RTC_InitStruct;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
  PWR_BackupAccessCmd(ENABLE);
  RCC_LSEConfig(RCC_LSE_ON);
  while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);
  RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
  RCC_RTCCLKCmd(ENABLE);
  RTC_WaitForSynchro();

  // RTC time base = LSE / ((AsynchPrediv+1) * (SynchPrediv+1)) = 1 Hz*/
  RTC_InitStruct.RTC_HourFormat = RTC_HourFormat_24;
  RTC_InitStruct.RTC_AsynchPrediv = 127;
  RTC_InitStruct.RTC_SynchPrediv = 255;
  RTC_Init(&RTC_InitStruct);
  
  struct gtm utm;
  rtc_gettime(&utm);
  g_rtcTime = gmktime(&utm);
}