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README.md

Expected result

You should see a number of different messages, printed out on certain intervals:

msg -- 14min -- 14 ticks since -> timeout by xtimer_msg every 14 minutes sleep -- 18min -- 18 ticks since -> timeout by xtimer_usleep, every 18 minutes msg -- 3min -- 3 ticks since -> timeout by xtimer_msg, every 3 minutes sleep -- 5min -- 5 ticks since -> timeout by xtimer_usleep, every 5 minutes TICK -- 1min -> event created by aggregation counter every 1 min

Background

This test is supposed to find out, if the xtimer behaves correctly when scheduling multiple long and short term timers. For this we schedule two 'long' and two 'mid'-term timers, while in parallel running one periodic fast timer.

The 'long' term timers are triggering every 14 and 18 min (so in this context we consider this long-term...). The mid-term timers are set to 3 and 5 minutes. Both kind of timers have one that is using xtimer_usleep and one that is using xtimer_set_msg.

The short-term timer is triggered every 50ms and is using xtimer_periodic_wakeup. Each time this timer triggers, it increments a software counter, which triggers then a message every minute. A 50ms interval should be small enough, to trigger also for 16-bit wide timers at least once in every timer period.

On each mid- and long-term timer event, the output shows also the number of fast timer (1min timer) ticks, that have been triggered since a timer was triggered last. This number should be equal to the timers interval.

For reasonable results, you should run this test at least for some hours...