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Add low power timer fallback for platforms without RTC 

Low power timer will be used as RTC for platforms that don't have HW RTC
capabilities.
pull/6878/head
Bartek Szatkowski 2018-05-11 12:26:39 +02:00
parent 2104d8ab5b
commit ac9276499f
1 changed files with 39 additions and 2 deletions
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41
platform/mbed_rtc_time.cpp
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@ -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;
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" {