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tests: improve calculation in hwtimer_wait

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Kudos to @Kijewski
This commit is contained in:
Ludwig Ortmann 2014-08-29 18:45:55 +02:00
parent 741536a82d
commit 31391622a3
1 changed files with 3 additions and 13 deletions
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16
tests/hwtimer_wait/main.c
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@ -33,20 +33,10 @@ int main(void)
puts("This is a regression test for a race condition in hwtimer_wait.");
puts("When the race condition is hit, the timer will wait for a very very long time.");
int iterations = 10000;
/* `#define I_CHANGED_START_DURATION 1` or update the constant if
* you change start_duration */
int start_duration = 256;
long iterations = 10000;
long start_duration = 256;
long duration = iterations * start_duration * 2L;
long duration = iterations * (
/* geometric series */
#if I_CHANGED_START_DURATION
(1 - pow(2,(log2(start_duration) + 1)))
/ (1 - 2)
#else
511.0
#endif
);
printf("The test should take about %li sec.\n", (HWTIMER_TICKS_TO_US(duration)/1000000));
for (unsigned long r = iterations; r > 0; r--) {