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cpu/efm32/timer_series2: sync STATUS register

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Make sure the STATUS register has been synced between the different clock domains.

Especially the LETIMER needs some time to update the STATUS register after it has been enabled. If the LETIMER is started and stopped with just a short delay, pm_layered gets confused because the timer seems to be inactive ...
This commit is contained in:
Jue 2022-10-27 23:48:08 +02:00 committed by Juergen Fitschen
parent e6d18af3ad
commit 54e915e40d
1 changed files with 26 additions and 8 deletions
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34
cpu/efm32/periph/timer_series2.c
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@ -224,26 +224,44 @@ unsigned int timer_read(tim_t dev)
return _is_letimer(dev) ? _letimer_read(dev) : _timer_read(dev);
}
static inline bool _letimer_is_running(LETIMER_TypeDef *tim)
{
/* make sure registers are up-to-date and
* we can rely on the STATS register */
LETIMER_SyncWait(tim);
return tim->STATUS & LETIMER_STATUS_RUNNING;
}
static inline bool _timer_is_running(TIMER_TypeDef *tim)
{
/* make sure registers are up-to-date and
* we can rely on the STATS register */
TIMER_SyncWait(tim);
return tim->STATUS & TIMER_STATUS_RUNNING;
}
static inline void _letimer_stop(tim_t dev)
{
LETIMER_TypeDef *tim = timer_config[dev].dev;
if (tim->STATUS & LETIMER_STATUS_RUNNING) {
if (_letimer_is_running(tim)) {
pm_unblock(LETIMER_PM_BLOCKER);
}
LETIMER_Enable(timer_config[dev].dev, false);
LETIMER_Enable(tim, false);
}
static inline void _timer_stop(tim_t dev)
{
TIMER_TypeDef *tim = timer_config[dev].dev;
if (tim->STATUS & TIMER_STATUS_RUNNING) {
if (_timer_is_running(tim)) {
pm_unblock(TIMER_PM_BLOCKER);
}
TIMER_Enable(timer_config[dev].dev, false);
TIMER_Enable(tim, false);
}
void timer_stop(tim_t dev)
@ -255,22 +273,22 @@ static inline void _letimer_start(tim_t dev)
{
LETIMER_TypeDef *tim = timer_config[dev].dev;
if (!(tim->STATUS & LETIMER_STATUS_RUNNING)) {
if (!_letimer_is_running(tim)) {
pm_block(LETIMER_PM_BLOCKER);
}
LETIMER_Enable(timer_config[dev].dev, true);
LETIMER_Enable(tim, true);
}
static inline void _timer_start(tim_t dev)
{
TIMER_TypeDef *tim = timer_config[dev].dev;
if (!(tim->STATUS & TIMER_STATUS_RUNNING)) {
if (!_timer_is_running(tim)) {
pm_block(TIMER_PM_BLOCKER);
}
TIMER_Enable(timer_config[dev].dev, true);
TIMER_Enable(tim, true);
}
void timer_start(tim_t dev)