How to modify this programe to see the difference between timeout and interval

I don't have time to test your code, but I think the differences are well documented.

Timeout 5s means: the task waits for 5s
Interval 5s means: the task executes every 5s independent of its execution time

Little example in pseudo code:

while (1)
{
    wait(5s); // timeout or interval
    executeFunction(); // takes 2s to execute
    sendSignal(); // send a signal e.g. toggle LED
}

If you use timeout, the signal will be send every 7s (5s wait + 2s execution). If you use interval, the signal will be send every 5s (3s wait and 2s execution).

I don't have time to test your code, but I think the differences are well documented.

Timeout 5s means: the task waits for 5s
Interval 5s means: the task executes every 5s independent of its execution time

Little example in pseudo code:

while (1)
{
    wait(5s); // timeout or interval
    executeFunction(); // takes 2s to execute
    sendSignal(); // send a signal e.g. toggle LED
}

If you use timeout, the signal will be send every 7s (5s wait + 2s execution). If you use interval, the signal will be send every 5s (3s wait and 2s execution).

thanks Stefan Hartwig and Per Westermark
help! when the message have been posted,I can not edit it again even if I find the error.

Yes, that's true - that is why it is so important that you pay attention to the Preview before you post the message!

Now, you'll just have to re-post it: as a Reply in this thread - not as another new thread!

hi: Stefan Hartwig,I doubt your Little example

  while (1)
  {
    wait(5s); // timeout or interval
    executeFunction(); // takes 2s to execute
    sendSignal(); // send a signal e.g. toggle LED
  }

Because I make an experiment by following little programe:

    while (1)    {
    os_wait (K_IVL, 200, 0);//wait  interval for 2s
    os_wait (K_TMO, 100, 0);//wait  timeout for 1s
    os_send_signal (1);

    }

my result is that the signal will be send every 3s
(2s wait for interval + 1s wait for timeout).The result is not that as my prediction:the signal will be send every 2s(1s wait for interval + 1s wait for timeout). the result is the same as following programe:

    while (1)    {
    os_wait (K_TMO, 200, 0);//wait  timeout for 2s
    os_wait (K_TMO, 100, 0);//wait  timeout for 1s
    os_send_signal (1);

    }

So , I still can not express the difference between tbem in programe.The reality is contrary to the theory .

It seems like you do not want to read the manuals:
The Interval is a variation of the Timeout. An interval is like a timeout except that the specified number of clock ticks is relative to the last time the os_wait function was invoked by the task.

Maybe its a good idea to use interval and timeout in the same task...

By the way: In RL-ARM it is explicitly forbidden to intermix interval and delay/timeout wait functions.

hi: I have read manual about them. But I have not been comprehensible to this sentence: The Interval is a variation of the Timeout. An interval is like a timeout except that the specified number of clock ticks is relative to the last time the os_wait function was invoked by the task.

It means that the interval is a timeout in the normal state , but which state the interval will not behaved like timeout?

In your little programe, the interval didnot behave like timeout.

  while (1)
  {
    wait(5s); // timeout or interval
    executeFunction(); // takes 2s to execute
    sendSignal(); // send a signal e.g. toggle LED
  }

But in my programe ,the interval did behave like timeout.

    while (1)    {
    os_wait (K_IVL, 200, 0);//wait  interval for 2s
    os_wait (K_TMO, 100, 0);//wait  timeout for 1s
    os_send_signal (1);

    }

your programe is in this condition:

except that the specified number of clock ticks is relative to the last time the os_wait function was invoked by the task.

isn't is?

why?

Result of using a periodic timer with value 5 ticks, and having code that takes 3 ticks to execute:

|xxx  |xxx  |xxx  |

Result of using a delay with value 5 ticks, and having code that takes 3 ticks to execute:

|xxx     |xxx     |xxx     |

Changing the delay to 2 ticks, would compensate:

|xxx  |xxx  |xxx  |

But what happens if the code takes 1 to 3 ticks randomly, and you try to compensate with a 2 tick delay?

|x  |xxx  |xx  |xxx  |x  |