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79 lines
1.5 KiB
79 lines
1.5 KiB
7 years ago
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/stm32/exti.h>
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#include <libopencm3/stm32/rtc.h>
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static inline uint32_t rtc_to_sec(uint32_t rtc)
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{
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uint32_t sec;
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sec = (rtc & 0xf) + ((rtc >> 4) & 0xf) * 10;
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sec += (((rtc >> 8) & 0xf) + ((rtc >> 12) & 0xf) * 10) * 60;
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sec += (((rtc >> 16) & 0xf) + ((rtc >> 20) & 0xf) * 10) * 3600;
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return sec;
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}
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static inline uint32_t sec_to_rtc(uint32_t sec)
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{
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uint32_t rtc;
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uint32_t hour, min;
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hour = sec / 3600;
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min = (sec % 3600) / 60;
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sec = sec % 60;
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rtc = ((hour / 10) << 20) | ((hour % 10) << 16);
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rtc |= ((min / 10) << 12) | ((min % 10) << 8);
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rtc |= ((sec / 10) << 4) | (sec % 10);
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return rtc;
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}
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void rtc_alarm_isr(void)
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{
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uint32_t alarm_sec;
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exti_reset_request(EXTI17);
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rtc_unlock();
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/* Disable the alarm. */
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RTC_CR &= ~RTC_CR_ALRAE;
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while (!(RTC_ISR & RTC_ISR_ALRAWF));
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RTC_ISR &= ~RTC_ISR_ALRAF;
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/* Set the alarm time. */
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alarm_sec = rtc_to_sec(RTC_TR) + 10;
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RTC_ALRMAR = sec_to_rtc(alarm_sec);
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RTC_ALRMAR |= 0xc0000000;
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/* Enable the alarm. */
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EXTI_IMR |= EXTI17;
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exti_set_trigger(EXTI17, EXTI_TRIGGER_RISING);
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RTC_CR |= RTC_CR_ALRAE;
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rtc_lock();
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}
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int alarm_init(void)
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{
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uint32_t alarm_sec;
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rtc_unlock();
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/* Set the alarm time. */
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alarm_sec = rtc_to_sec(RTC_TR) + 10;
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RTC_ALRMAR = sec_to_rtc(alarm_sec);
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RTC_ALRMAR |= 0xc0000000;
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RTC_CR |= RTC_CR_ALRAIE | RTC_CR_BYPSHAD;
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nvic_enable_irq(NVIC_RTC_IRQ);
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EXTI_IMR |= EXTI17;
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exti_set_trigger(EXTI17, EXTI_TRIGGER_RISING);
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rtc_lock();
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return 0;
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}
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