/*
 * rtc.h
 *
 *  Created on: Oct 16, 2024
 *      Author: true
 */

#ifndef USER_PERIPH_RTC_H_
#define USER_PERIPH_RTC_H_


#include <stdint.h>



/* a small note about backup registers:
 *
 * the datasheet clearly states there are 42 16-bit registers.
 * it does not cut out any exception for CH32V203 except CH32V203RB.
 * however, the reference manual states that registers 11-42 are only
 * for the _D8 chips, and not the _D6 V4B chips like this one.
 * thus we only have _10_ backup registers, not 42.
 */
#define RTC_INIT_DR         BKP_DR1
#define RTC_STATE_DR        BKP_DR2



enum RTCState {
    RTC_STATE_UNINITIALIZED = 0,
    RTC_STATE_CLOCK_NOT_SET,
    RTC_STATE_OK = 0x7f
};

typedef struct RTClock {
    uint16_t year;
    uint8_t mon;
    uint8_t day;
    uint8_t h;
    uint8_t m;
    uint8_t s;
} RTClock;



extern uint8_t rtc_state;



int8_t rtc_init();

int8_t rtc_set_clock(struct RTClock *c);



#endif /* USER_PERIPH_RTC_H_ */