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tests: timer_monotonic: Use volatile for timing variables

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This commit adds the `volatile` qualifier to the timing variables, in
order to ensure that the compiler does not try to optimise the test in
a way that can affect the execution time measurements.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2022-05-16 13:35:37 +09:00 committed by Anas Nashif
parent a195f98265
commit b744130735
1 changed files with 4 additions and 2 deletions
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6
tests/kernel/timer/timer_monotonic/src/main.c
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@ -10,7 +10,8 @@
int test_frequency(void)
{
uint32_t start, end, delta, pct;
volatile uint32_t start, end;
uint32_t delta, pct;
TC_PRINT("Testing system tick frequency\n");
@ -49,7 +50,8 @@ int test_frequency(void)
*/
void test_timer(void)
{
uint32_t t_last, t_now, i, errors;
volatile uint32_t t_last, t_now;
uint32_t i, errors;
int32_t diff;
errors = 0U;