twr_rtc.h

#ifndef _TWR_RTC_H
#define _TWR_RTC_H
 
#include <time.h>
#include <stm32l0xx.h>
#include "twr_common.h"
 
 
// Note: For performance reasons, the TWR_RTC_PREDIV_S value should be a power of
// two.
#define TWR_RTC_PREDIV_S 256
#define TWR_RTC_PREDIV_A 128
 
 
extern int _twr_rtc_writable_semaphore;
 
void twr_rtc_init(void);
 
void twr_rtc_get_datetime(struct tm *tm);
 
void twr_rtc_get_timestamp(struct timespec *tv);
 
int twr_rtc_set_datetime(struct tm *tm, int ms);
 
 
uint32_t twr_rtc_datetime_to_timestamp(struct tm *tm);
 
//
// This function supports nested invocations. If twr_rtc_enable_write has been
// called repeatedly, calling this function repeatedly will only lock the RTC
// again after all calls to twr_rtc_enable_write have been unrolled.
 
static inline void twr_rtc_disable_write()
{
    if (--_twr_rtc_writable_semaphore <= 0) {
        _twr_rtc_writable_semaphore = 0;
        RTC->WPR = 0xff;
    }
}
 
 
static inline void twr_rtc_enable_write()
{
    ++_twr_rtc_writable_semaphore;
    RTC->WPR = 0xca;
    RTC->WPR = 0x53;
}
 
static inline void twr_rtc_wait()
{
    while(!(RTC->ISR & RTC_ISR_RSF));
}
 
 
 
void twr_rtc_set_init(bool state);
 
 
#endif // _TWR_RTC_H