可否考虑增加一实用函数：rt_thread_delay_HMSM

发布于 2011-07-25 14:24:02 浏览：3033 订阅该版

可否考虑增加一实用函数：
rt_err_t  rt_thread_delay_HMSM (  rt_uint8_t   hours, 
                                                 rt_uint8_t   minutes, 
                                                 rt_uint8_t   seconds, 
                                                 rt_uint16_t  ms)
很多时候我们想大致定一个绝对时间，比如LED的闪烁，蜂鸣器的滴滴等，但如果使用rt_thread_delay()，则参数的选择依赖RT_TICK_PER_SECOND，而这个参数很可能会随着进度的进展而被改变。参考ucos-ii的设计，所以提出增设rt_thread_delay_HMSM()函数的想法。参考代码：
rt_err_t  rt_thread_delay_HMSM (  rt_uint8_t   hours, 
                                                 rt_uint8_t   minutes, 
                                                 rt_uint8_t   seconds, 
                                                 rt_uint16_t  ms)
{
    rt_uint32_t ticks;

if (OSIntNesting > 0) {                      /* See if trying to call from an ISR                  */
        return (OS_ERR_TIME_DLY_ISR);
    }
    if (hours == 0) {
        if (minutes == 0) {
            if (seconds == 0) {
                if (ms == 0) {
                    return (OS_ERR_TIME_ZERO_DLY);
                }
            }
        }
    }
    if (minutes > 59) {
        return (OS_ERR_TIME_INVALID_MINUTES);    /* Validate arguments to be within range              */
    }
    if (seconds > 59) {
        return (OS_ERR_TIME_INVALID_SECONDS);
    }
    if (ms > 999) {
        return (OS_ERR_TIME_INVALID_MS);
    }
/* Compute the total number of clock ticks required.. */
/* .. (rounded to the nearest tick)                   */
    ticks = ((u32)hours * 3600L + (u32)minutes * 60L + (u32)seconds) * RT_TICK_PER_SECOND
          + RT_TICK_PER_SECOND * ((u32)ms + 500L / RT_TICK_PER_SECOND) / 1000L;
    rt_thread_delay(ticks);
    return (OS_ERR_NONE);
}