mbtk/test/others/rtc_alarm_test.c

#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/rtc.h>

int main() {
    int rtc_fd = open("/dev/rtc0", O_RDWR);
    if (rtc_fd == -1) {
        perror("open");
        return 1;
    }

    struct rtc_time rtc_tm;
    struct rtc_wkalrm rtc_alarm;
    int flags;

    // ......
    if (ioctl(rtc_fd, RTC_RD_TIME, &rtc_alarm.time) == -1) {
        perror("ioctl RTC_RD_TIME");
        close(rtc_fd);
        return 1;
    }

    // ......
    printf("Current RTC time: %d-%d-%d   %02d:%02d:%02d\n",
           rtc_alarm.time.tm_year, rtc_alarm.time.tm_mon, rtc_alarm.time.tm_mday, rtc_alarm.time.tm_hour, rtc_alarm.time.tm_min, rtc_alarm.time.tm_sec);

    // .. RTC ...
    rtc_alarm.time.tm_sec = rtc_tm.tm_sec + 10;  // 10 .......
    rtc_alarm.enabled = 1;

    if (ioctl(rtc_fd, RTC_WKALM_SET, &rtc_alarm) == -1) {
        perror("ioctl RTC_WKALM_SET1");
        close(rtc_fd);
        return 1;
    }
    if (ioctl(rtc_fd, RTC_AIE_ON) == -1) {
        perror("ioctl RTC_AIE_ON");
        close(rtc_fd);
        return 1;
    }
    printf("RTC alarm set for 10 seconds from now1\n");

#if 0
    rtc_alarm.time.tm_sec = rtc_tm.tm_sec + 10;  // 10 .......
    rtc_alarm.enabled = 0;

    if (ioctl(rtc_fd, RTC_WKALM_SET, &rtc_alarm) == -1) {
        perror("ioctl RTC_WKALM_SET2");
        close(rtc_fd);
        return 1;
    }
    if (ioctl(rtc_fd, RTC_AIE_OFF) == -1) {
        perror("ioctl RTC_AIE_OFF");
        close(rtc_fd);
        return 1;
    }
    printf("RTC alarm disable2\n");
#endif
    close(rtc_fd);
    return 0;
}