//
// RTC: configure real-time clock
//

#include "stm32f0xx_hal.h"
#include "rtc.h"
#include "gpio.h"


RTC_HandleTypeDef hrtc;

static void Error_Handler(void)
{
	volatile uint8_t crap = 1;

	for(uint16_t i=0; i<300; i++)
	{
		HAL_GPIO_TogglePin(LED_BLUE);
		HAL_Delay(100);
	}
}

// Initialize RTC
void rtc_init(void)
{
	__HAL_RCC_RTC_ENABLE();

    
	RTC_TimeTypeDef sTime;
	RTC_DateTypeDef sDate;
	RTC_AlarmTypeDef sAlarm;

	HAL_PWR_EnableBkUpAccess();

	hrtc.Instance = RTC;
	hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
	hrtc.Init.AsynchPrediv = 124;
	hrtc.Init.SynchPrediv = 322; // if this has enough bits should be 1.0018Hz based on 40kHz LSI
	hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
 	hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
	hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;

	if (HAL_RTC_Init(&hrtc) != HAL_OK)
	{
		Error_Handler();
	}

	sTime.Hours = 0x0;
	sTime.Minutes = 0x0;
	sTime.Seconds = 0x0;
	sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
	sTime.StoreOperation = RTC_STOREOPERATION_RESET;
	if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
	{
		Error_Handler();
	}

	sDate.WeekDay = RTC_WEEKDAY_MONDAY;
	sDate.Month = RTC_MONTH_JANUARY;
	sDate.Date = 0x01;
	sDate.Year = 0x19;

	if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK)
	{
		Error_Handler();
	}


	/**Enable the Alarm A
	*/
	sAlarm.AlarmTime.Hours = 0x0;
	sAlarm.AlarmTime.Minutes = 0x0;
	sAlarm.AlarmTime.Seconds = 0x0;
	sAlarm.AlarmTime.SubSeconds = 0x0;
	sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
	sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;

	// Alarm will trigger on the Xth second of every minute
	sAlarm.AlarmMask = RTC_ALARMMASK_ALL; // Trigger every second for now
	sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_ALL;
	sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
	sAlarm.AlarmDateWeekDay = RTC_WEEKDAY_MONDAY;
	sAlarm.Alarm = RTC_ALARM_A;
	if (HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm, RTC_FORMAT_BCD) != HAL_OK)
	{
		Error_Handler();
	}

	HAL_NVIC_SetPriority(RTC_IRQn, 0, 0);
	HAL_NVIC_EnableIRQ(RTC_IRQn);

	HAL_RTC_WaitForSynchro(&hrtc);


}

void rtc_cal(void)
{
	// Do something with hrtc.Instance->CALR; // this has a plus and minus component, see refman
}

RTC_HandleTypeDef* rtc_gethandle(void)
{
	return &hrtc;
}