esp32-alarm-clock/main/ds3231.h

#include "esp_err.h"
#include <time.h>

enum alrm1_mode {
    each_second = 0x0F,
    seconds_match = 0x0E,
    minutes_seconds_match = 0x0C,
    hours_minutes_seconds_match = 0x08,
    all_match = 0x00,
    day_time_match = 0x10
};

esp_err_t ds3231_init(int sda_pin, int scl_pin);

esp_err_t ds3231_read_date_time(struct tm *date_time);

esp_err_t ds3231_write_date_time(struct tm date_time);

esp_err_t ds3231_set_alrm1(struct tm date_time, uint16_t mode);

esp_err_t ds3231_enable_arlm1_interrupt(void);

esp_err_t ds3231_acknowledge_alrm1(void);

esp_err_t ds3231_disable_32khz_output(void);