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cpu/atmega_common: RTC: implement rtc_get_time_ms()

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This commit is contained in:
Benjamin Valentin 2021-05-04 17:27:20 +02:00
parent 40d952bceb
commit 7c1b5630d2
3 changed files with 24 additions and 0 deletions
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1
cpu/atmega_common/Kconfig
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@ -20,6 +20,7 @@ config CPU_COMMON_ATMEGA
select HAS_PERIPH_GPIO
select HAS_PERIPH_GPIO_IRQ
select HAS_PERIPH_PM
select HAS_PERIPH_RTC_MS
select HAS_PERIPH_RTT_SET_COUNTER
select HAS_PERIPH_TIMER_PERIODIC
select HAS_PERIPH_WDT

1
cpu/atmega_common/Makefile.features
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@ -10,6 +10,7 @@ FEATURES_PROVIDED += periph_cpuid
FEATURES_PROVIDED += periph_eeprom
FEATURES_PROVIDED += periph_gpio periph_gpio_irq
FEATURES_PROVIDED += periph_pm
FEATURES_PROVIDED += periph_rtc_ms
FEATURES_PROVIDED += periph_rtt_set_counter
FEATURES_PROVIDED += periph_timer_periodic
FEATURES_PROVIDED += periph_wdt

22
cpu/atmega_common/periph/rtc.c
View File

@ -102,6 +102,28 @@ int rtc_get_time(struct tm *time)
return 0;
}
int rtc_get_time_ms(struct tm *time, uint16_t *ms)
{
uint8_t cnt_before, cnt_after;
/* loop in case of overflow */
do {
cnt_before = TCNT2;
/* prevent compiler from reordering memory access to tm_now,
* including moving it out of the loop
*/
__asm__ volatile ("" : : : "memory");
*time = tm_now;
cnt_after = TCNT2;
} while (cnt_before > cnt_after);
*ms = (cnt_after * 1000UL) >> 8;
return 0;
}
int rtc_get_alarm(struct tm *time)
{
*time = tm_alarm;