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Improve clock accuraty and reduce clock drifting over time (before : 1/2h per day, now : 0 minutes in 24h).

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This commit is contained in:
JF 2020-01-31 20:01:33 +01:00
parent dff0d747c4
commit be7be86033
2 changed files with 792 additions and 781 deletions
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15
src/Components/DateTime/DateTimeController.cpp
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@ -29,6 +29,7 @@ void DateTime::SetTime(uint16_t year, uint8_t month, uint8_t day, uint8_t dayOfW
}
void DateTime::UpdateTime(uint32_t systickCounter) {
// Handle systick counter overflow
uint32_t systickDelta = 0;
if(systickCounter < previousSystickCounter) {
systickDelta = 0xffffff - previousSystickCounter;
@ -37,8 +38,18 @@ void DateTime::UpdateTime(uint32_t systickCounter) {
systickDelta = systickCounter - previousSystickCounter;
}
previousSystickCounter = systickCounter;
currentDateTime += std::chrono::milliseconds(systickDelta);
/*
* 1000 ms = 1024 ticks
*/
auto correctedDelta = systickDelta / 1024;
auto rest = (systickDelta - (correctedDelta*1024));
if(systickCounter >= rest) {
previousSystickCounter = systickCounter - rest;
} else {
previousSystickCounter = 0xffffff - (rest - systickCounter);
}
currentDateTime += std::chrono::seconds (correctedDelta);
auto dp = date::floor<date::days>(currentDateTime);
auto time = date::make_time(currentDateTime-dp);

2
src/sdk_config.h
View file

@ -12632,7 +12632,7 @@
// <11=> NRF_CLOCK_LF_ACCURACY_1_PPM
#ifndef NRF_SDH_CLOCK_LF_ACCURACY
#define NRF_SDH_CLOCK_LF_ACCURACY 0
#define NRF_SDH_CLOCK_LF_ACCURACY 7
#endif
// </h>