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tests/periph_timer: also test for spurious IRQs

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Previously the test only checked if IRQs fired when expected. This
extends the test to also check that IRQs do not fire when not expected.
This commit is contained in:
Marian Buschsieweke 2022-11-24 14:01:23 +01:00
parent e7ee53e6ed
commit 496abf0a4e
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1 changed files with 34 additions and 0 deletions
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34
tests/periph_timer/main.c
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@ -25,6 +25,8 @@
#include "atomic_utils.h"
#include "clk.h"
#include "periph/timer.h"
#include "test_utils/expect.h"
#include "time_units.h"
/**
* @brief Make sure, the maximum number of timers is defined
@ -49,6 +51,15 @@ static void cb(void *arg, int chan)
fired++;
}
static void cb_not_to_be_executed(void *arg, int chan)
{
(void)arg;
(void)chan;
puts("Spurious timer fired");
expect(0);
}
static int test_timer(unsigned num)
{
int set = 0;
@ -117,6 +128,29 @@ static int test_timer(unsigned num)
}
}
/* test for spurious timer IRQs */
expect(0 == timer_init(TIMER_DEV(num), TIMER_SPEED, cb_not_to_be_executed, NULL));
const unsigned duration = 2ULL * US_PER_MS * US_PER_SEC / TIMER_SPEED;
unsigned target = timer_read(TIMER_DEV(num)) + duration;
expect(0 == timer_set_absolute(TIMER_DEV(num), 0, target));
expect(0 == timer_clear(TIMER_DEV(num), 0));
while (timer_read(TIMER_DEV(num)) < target) {
/* busy waiting for the timer to reach it timeout. Timer must not fire,
* it was cleared */
}
/* checking again to make sure that any IRQ pending bit that may just was
* mask doesn't trigger a timer IRQ on the next set */
target = timer_read(TIMER_DEV(num)) + duration;
timer_set_absolute(TIMER_DEV(num), 0, target);
timer_clear(TIMER_DEV(num), 0);
while (timer_read(TIMER_DEV(num)) < target) {
/* busy waiting for the timer to reach it timeout. Timer must not fire,
* it was cleared */
}
return 1;
}