Demo

本 Demo 是 test_alarm 的源码 bsp/examples/test-alarm/test_alarm.c，展示了在 RT-Thread 中，设置一个 oneshot 类型的 alarm 并使用标准时间接口获取当前时间的参考示例：

static void test_alarm_callback(rt_alarm_t alarm, time_t timestamp)
{
    pr_info("Test alarm callback function.\n");
}

static void cmd_test_alarm(int argc, char **argv)
{
    struct rt_alarm_setup setup;
    struct rt_alarm *alarm = RT_NULL;
    u32 timeout = 0;
    time_t now;
    struct tm p_tm;

    if (argc != 2) {
        pr_err("Invalid parameter\n");
        return;
    }
    sscanf((char *)argv[1], "%u", &timeout);

    now = time(NULL) + timeout;
    gmtime_r(&now, &p_tm);

    setup.wktime = p_tm;
    alarm = rt_alarm_create(test_alarm_callback, &setup);
    if (alarm) {
        alarm->flag = RT_ALARM_ONESHOT;
        rt_alarm_start(alarm);
    }
}