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rtt_rtc: add rtc_settimeofday() & rtc_gettimeofday()

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This commit is contained in:
Benjamin Valentin 2021-05-18 18:29:24 +02:00
parent e3b52ff08d
commit 0964a217b5
2 changed files with 85 additions and 1 deletions
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59
drivers/include/rtt_rtc.h Normal file
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@ -0,0 +1,59 @@
/*
* Copyright (C) 2021 ML!PA Consulting GmbH
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @defgroup drivers_rtt_rtc RTC emulation on top of a RTT
* @ingroup drivers_periph_rtc
*
* @{
*
* @file
* @brief Additional functions provided in addition to the normal RTC API.
*
* @author Benjamin Valentin <benjamin.valentin@ml-pa.com>
*/
#ifndef RTT_RTC_H
#define RTT_RTC_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Set the time as epoch with sub-second precision
* This feature is an extension provided by the `rtt_rtc` module.
*
* @note The actual µs precision depends on the underlying hardware.
* The smallest time step will be 1 / @ref RTT_FREQUENCY.
*
* @param[in] s The new epoch timestamp
* @param[in] us Sub-Seconds
*/
void rtt_rtc_settimeofday(uint32_t s, uint32_t us);
/**
* @brief Get the current epoch with sub-second precision
* This feature is an extension provided by the `rtt_rtc` module.
*
* @note The actual µs precision depends on the underlying hardware.
* The smallest time step will be 1 / @ref RTT_FREQUENCY.
*
* @param[out] s The current epoch timestamp
* @param[out] us Sub-Seconds
*/
void rtt_rtc_gettimeofday(uint32_t *s, uint32_t *us);
#ifdef __cplusplus
}
#endif
#endif /* RTT_RTC_H */
/** @} */

27
drivers/rtt_rtc/rtt_rtc.c
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@ -7,7 +7,7 @@
*/ */
/** /**
* @ingroup drivers_periph_rtc * @ingroup drivers_rtt_rtc
* @{ * @{
* *
* @file * @file
@ -29,6 +29,7 @@
#include "periph/rtc.h" #include "periph/rtc.h"
#include "periph/rtt.h" #include "periph/rtt.h"
#include "timex.h" #include "timex.h"
#include "rtt_rtc.h"
#define ENABLE_DEBUG 0 #define ENABLE_DEBUG 0
#include "debug.h" #include "debug.h"
@ -204,3 +205,27 @@ void rtc_poweroff(void)
{ {
rtt_poweroff(); rtt_poweroff();
} }
void rtt_rtc_settimeofday(uint32_t s, uint32_t us)
{
/* disable alarm to prevent race condition */
rtt_clear_alarm();
uint32_t now = ((uint64_t)us * RTT_SECOND) / US_PER_SEC;
rtc_now = s;
rtt_set_counter(now);
/* calculate next wake-up period */
_update_alarm(0);
}
void rtt_rtc_gettimeofday(uint32_t *s, uint32_t *us)
{
uint32_t now;
unsigned state = irq_disable();
now = rtt_get_counter();
*s = _rtc_now(now);
*us = ((uint64_t)SUBSECONDS(now - last_alarm) * US_PER_SEC)
/ RTT_SECOND;
irq_restore(state);
}