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Fix for issue #8155 (NRF52832: time stops after 35 minutes) 

Low power Timer is used as RTC for platforms that don't have HW RTC capabilities (like NRF52832).
`_rtc_lpticker_read(void)` function currently uses `Timer::read()` function to trace elapsed time.
`Timer::read()` returns seconds represented as `float` value, but this value is calculated from `int` since `Timer::read_us()` returns `int`.
This limits time tracing to ~35 min.
To fix this problem we will use `timer::read_high_resolution_us()` (which returns unsigned 64 bit value) instead of `Timer::read()`.
pull/8165/head
Przemyslaw Stekiel 2018-09-18 09:48:53 +02:00
parent 3da606e586
commit 814940cabe
1 changed files with 3 additions and 1 deletions
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4
platform/mbed_rtc_time.cpp
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@ -33,6 +33,8 @@ static void (*_rtc_write)(time_t t) = rtc_write;
#include "drivers/LowPowerTimer.h" #include "drivers/LowPowerTimer.h"
#define US_PER_SEC 1000000
static SingletonPtr<mbed::LowPowerTimer> _rtc_lp_timer; static SingletonPtr<mbed::LowPowerTimer> _rtc_lp_timer;
static uint64_t _rtc_lp_base; static uint64_t _rtc_lp_base;
static bool _rtc_enabled; static bool _rtc_enabled;
@ -50,7 +52,7 @@ static int _rtc_lpticker_isenabled(void)
static time_t _rtc_lpticker_read(void) static time_t _rtc_lpticker_read(void)
{ {
return (uint64_t)_rtc_lp_timer->read() + _rtc_lp_base; return _rtc_lp_timer->read_high_resolution_us() / US_PER_SEC + _rtc_lp_base;
} }
static void _rtc_lpticker_write(time_t t) static void _rtc_lpticker_write(time_t t)