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drivers: timer: stm32 lptim stops counting on timeout FOREVER

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When setting a timeout K_TICKS_FOREVER,the lptimer clock is stopped
(no reset of the lptim).
Then is the lptim possibly re-started when another source asks for.
The lptim clock must then be re-started and continue counting.
This is the case when wakeup from sleep mode, for example.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2020-06-04 16:57:12 +02:00 • committed by Maureen Helm
commit 0856e99155
1 changed files with 6 additions and 2 deletions
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8
drivers/timer/stm32_lptim_timer.c
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@ -178,12 +178,16 @@ void z_clock_set_timeout(int32_t ticks, bool idle)
}
if (ticks == K_TICKS_FOREVER) {
/* disable LPTIM */
LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_LPTIM1);
/* disable LPTIM clock to avoid counting */
LL_APB1_GRP1_DisableClock(LL_APB1_GRP1_PERIPH_LPTIM1);
return;
}
/* if LPTIM clock was previously stopped, it must now be restored */
if (!LL_APB1_GRP1_IsEnabledClock(LL_APB1_GRP1_PERIPH_LPTIM1)) {
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_LPTIM1);
}
/* passing ticks==1 means "announce the next tick",
* ticks value of zero (or even negative) is legal and
* treated identically: it simply indicates the kernel would like the