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Merge pull request #1625 from LudwigOrtmann/hwtimer_wait_duration

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tests: print expected duration in hwtimer_wait
This commit is contained in:
Ludwig Ortmann 2014-08-28 07:57:34 -07:00
commit 872f8ecfea
1 changed files with 15 additions and 3 deletions
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18
tests/hwtimer_wait/main.c
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@ -21,6 +21,7 @@
#include <stdio.h> #include <stdio.h>
#include <limits.h> #include <limits.h>
#include <stdlib.h> #include <stdlib.h>
#include <math.h>
#include "board_uart0.h" #include "board_uart0.h"
#include "posix_io.h" #include "posix_io.h"
@ -30,13 +31,24 @@
int main(void) int main(void)
{ {
puts("This is a regression test for a race condition in hwtimer_wait."); 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..."); puts("When the race condition is hit, the timer will wait for a very very long time.");
for (unsigned long r = 10000; r > 0; r--) { int iterations = 10000;
for (unsigned long i = 256; i; i = i >> 1) { int start_duration = 256;
long duration = iterations * (
/* geometric series */
(1 - pow(2,(log2(start_duration) + 1)))
/ (1 - 2)
);
printf("The test should take about %li sec.\n", (HWTIMER_TICKS_TO_US(duration)/1000000));
for (unsigned long r = iterations; r > 0; r--) {
for (unsigned long i = start_duration; i; i = i >> 1) {
hwtimer_wait(i); hwtimer_wait(i);
} }
} }
puts("success"); puts("success");
return 0; return 0;
} }