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drivers: nrf_rtc_timer: Fix checking of maximum timeout value

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Align the condition checked in compare_set_no_locks() with what
set_absolute_alarm() actually provides (and slightly correct the
latter function so that it provides what it is supposed to).

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
This commit is contained in:
Andrzej Głąbek 2023-01-03 12:47:47 +01:00 • committed by Carles Cufí
commit a98316ba09
1 changed files with 8 additions and 3 deletions
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11
drivers/timer/nrf_rtc_timer.c
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@ -219,7 +219,7 @@ uint64_t z_nrf_rtc_timer_get_ticks(k_timeout_t t)
/** @brief Function safely sets absolute alarm.
*
* It assumes that provided value is less than COUNTER_HALF_SPAN from now.
* It assumes that provided value is at most COUNTER_HALF_SPAN cycles from now.
* It detects late setting and also handle +1 cycle case.
*
* @param[in] chan A channel for which a new CC value is to be set.
@ -228,6 +228,11 @@ uint64_t z_nrf_rtc_timer_get_ticks(k_timeout_t t)
*/
static void set_absolute_alarm(int32_t chan, uint32_t abs_val)
{
/* Ensure that the value exposed in this driver API is consistent with
* assumptions of this function.
*/
BUILD_ASSERT(NRF_RTC_TIMER_MAX_SCHEDULE_SPAN <= COUNTER_HALF_SPAN);
uint32_t cc_val = abs_val & COUNTER_MAX;
uint32_t cc_inc = 2;
@ -267,7 +272,7 @@ static void set_absolute_alarm(int32_t chan, uint32_t abs_val)
* But if the COMPARE event turns out to be already generated,
* there is obviously no need to continue the loop.
*/
if ((counter_sub(cc_val, now + 2) > COUNTER_HALF_SPAN) &&
if ((counter_sub(cc_val, now + 2) > (COUNTER_HALF_SPAN - 2)) &&
!event_check(chan)) {
cc_val = now + cc_inc;
cc_inc++;
@ -286,7 +291,7 @@ static int compare_set_nolocks(int32_t chan, uint64_t target_time,
uint64_t curr_time = z_nrf_rtc_timer_read();
if (curr_time < target_time) {
if (target_time - curr_time > COUNTER_SPAN) {
if (target_time - curr_time > COUNTER_HALF_SPAN) {
/* Target time is too distant. */
return -EINVAL;
}