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Add low power timer fallback for platforms without RTC #6878

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Merged
merged 1 commit into from
May 22, 2018
Merged

Add low power timer fallback for platforms without RTC #6878

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41 changes: 39 additions & 2 deletions platform/mbed_rtc_time.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,16 +23,53 @@
static SingletonPtr<PlatformMutex> _mutex;

#if DEVICE_RTC

static void (*_rtc_init)(void) = rtc_init;
static int (*_rtc_isenabled)(void) = rtc_isenabled;
static time_t (*_rtc_read)(void) = rtc_read;
static void (*_rtc_write)(time_t t) = rtc_write;
#else

#elif DEVICE_LOWPOWERTIMER

#include "drivers/LowPowerTimer.h"

static SingletonPtr<mbed::LowPowerTimer> _rtc_lp_timer;
static uint64_t _rtc_lp_base;
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I see that _rtc_lp_base is getting written in the write function below, how is it used?

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_rtc_lp_base is used as a start time and then we add the actual timer value to it as timer starts from 0.

static bool _rtc_enabled;

static void _rtc_lpticker_init(void)
{
_rtc_lp_timer->start();
_rtc_enabled = true;
}

static int _rtc_lpticker_isenabled(void)
{
return (_rtc_enabled == true);
}

static time_t _rtc_lpticker_read(void)
{
return (uint64_t)_rtc_lp_timer->read() + _rtc_lp_base;
}

static void _rtc_lpticker_write(time_t t)
{
_rtc_lp_base = t;
}

static void (*_rtc_init)(void) = _rtc_lpticker_init;
static int (*_rtc_isenabled)(void) = _rtc_lpticker_isenabled;
static time_t (*_rtc_read)(void) = _rtc_lpticker_read;
static void (*_rtc_write)(time_t t) = _rtc_lpticker_write;

#else /* DEVICE_LOWPOWERTIMER */

static void (*_rtc_init)(void) = NULL;
static int (*_rtc_isenabled)(void) = NULL;
static time_t (*_rtc_read)(void) = NULL;
static void (*_rtc_write)(time_t t) = NULL;
#endif
#endif /* DEVICE_LOWPOWERTIMER */

#ifdef __cplusplus
extern "C" {
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