复位后第二次设定时间会出错

本帖最后由 jeffwei 于 2019-8-2 15:21 编辑

rt_err_t set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
{
    time_t now;
    struct tm *p_tm;
    struct tm tm_new;
    rt_device_t device;
    rt_err_t ret = -RT_ERROR;

    /* get current time */
    now = time(RT_NULL);

    /* lock scheduler. */
    rt_enter_critical();
    /* converts calendar time time into local time. */
    p_tm = localtime(&now);
    //p_tm = gmtime(&now);
    
    /* copy the statically located variable */
    memcpy(&tm_new, p_tm, sizeof(struct tm));


    /* update time. */
    tm_new.tm_hour = hour;
    tm_new.tm_min  = minute;
    tm_new.tm_sec  = second;
//    tm_new.tm_isdst = -1;

    /* converts the local time in time to calendar time. */
    now = mktime(&tm_new);

    device = rt_device_find("rtc");
    if (device == RT_NULL)
    {
        return -RT_ERROR;
    }

    /* update to RTC device. */
    ret = rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
        /* unlock scheduler. */
    rt_exit_critical();

    return ret;
}

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