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cpu/stm32_common: fix rtt registers access

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This commit is contained in:
Vincent Dupont 2019-03-27 16:42:16 +01:00
parent e5c5beaf40
commit 749b291273
1 changed files with 9 additions and 1 deletions
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10
cpu/stm32_common/periph/rtt.c
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@ -95,14 +95,20 @@ void rtt_init(void)
/* enable timer */
LPTIM1->CR = LPTIM_CR_ENABLE;
/* set auto-reload value (timer needs to be enabled for this) */
LPTIM1->ICR = LPTIM_ICR_ARROKCF;
LPTIM1->ARR = RTT_MAX_VALUE;
while (!(LPTIM1->ISR & LPTIM_ISR_ARROK)) {}
/* start the timer */
LPTIM1->CR |= LPTIM_CR_CNTSTRT;
}
uint32_t rtt_get_counter(void)
{
return (uint32_t)LPTIM1->CNT;
uint32_t cnt;
do {
cnt = LPTIM1->CNT;
} while (cnt != LPTIM1->CNT);
return cnt;
}
void rtt_set_overflow_cb(rtt_cb_t cb, void *arg)
@ -125,9 +131,11 @@ void rtt_set_alarm(uint32_t alarm, rtt_cb_t cb, void *arg)
assert(cb && !(alarm & ~RTT_MAX_VALUE));
unsigned is = irq_disable();
LPTIM1->ICR = LPTIM_ICR_CMPOKCF;
to_cb = cb;
to_arg = arg;
LPTIM1->CMP = (uint16_t)alarm;
while (!(LPTIM1->ISR & LPTIM_ISR_CMPOK)) {}
irq_restore(is);
}