#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/exti.h>
#include <libopencm3/stm32/rtc.h>

void rtc_alarm_isr(void)
{
	exti_reset_request(EXTI17);

	if (rtc_check_flag(RTC_ALR)) {
		rtc_clear_flag(RTC_ALR);

		rtc_set_alarm_time(rtc_get_counter_val() + 10);

		EXTI_IMR |= EXTI17;
		exti_set_trigger(EXTI17, EXTI_TRIGGER_RISING);
	}
}

int alarm_init(void)
{
	rtc_enable_alarm();
	rtc_set_alarm_time(rtc_get_counter_val() + 10);

	nvic_enable_irq(NVIC_RTC_ALARM_IRQ);
	EXTI_IMR |= EXTI17;
	exti_set_trigger(EXTI17, EXTI_TRIGGER_RISING);

	return 0;
}