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driver: counter: counter_ll_stm32_rtc.c: Add 1 tick to alarm

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Add +1 tick to alarm in order to compensate the partially started tick.
Alarm will expire between requested ticks and ticks+1.
In case only 1 tick is requested, it will avoid that +1 Tick event
occurs before alarm setting is finished.

Signed-off-by: Alexandre Bourdiol <alexandre.bourdiol@st.com>
This commit is contained in:
Alexandre Bourdiol 2020-05-14 15:49:24 +02:00 • committed by Carles Cufí
commit 5559430654
1 changed files with 6 additions and 1 deletions
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7
drivers/counter/counter_ll_stm32_rtc.c
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@ -143,7 +143,12 @@ static int rtc_stm32_set_alarm(struct device *dev, u8_t chan_id,
data->user_data = alarm_cfg->user_data;
if ((alarm_cfg->flags & COUNTER_ALARM_CFG_ABSOLUTE) == 0) {
ticks += now;
/* Add +1 in order to compensate the partially started tick.
* Alarm will expire between requested ticks and ticks+1.
* In case only 1 tick is requested, it will avoid
* that tick+1 event occurs before alarm setting is finished.
*/
ticks += now + 1;
}
LOG_DBG("Set Alarm: %d\n", ticks);