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Merge pull request #1896 from weebl2000/robust-time-esp32

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Keep time in RTC slow memory, prevents date dropping to 1970 date after crash/watchdog/brownout reset on ESP32
This commit is contained in:
Liam Cottle
2026-09-28 23:13:49 +13:00
committed by GitHub
parent b9f519ef5a cb6f2f2255
commit 5d266dcb43
1 changed files with 26 additions and 5 deletions
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src/helpers/ESP32Board.h
+26 -5
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@@ -200,19 +200,30 @@ public:
}
};
static RTC_NOINIT_ATTR uint32_t _rtc_backup_time;
static RTC_NOINIT_ATTR uint32_t _rtc_backup_magic;
#define RTC_BACKUP_MAGIC 0xAA55CC33
#define RTC_TIME_MIN 1772323200 // 1 Mar 2026
class ESP32RTCClock : public mesh::RTCClock {
public:
ESP32RTCClock() { }
void begin() {
esp_reset_reason_t reason = esp_reset_reason();
if (reason == ESP_RST_POWERON) {
// start with some date/time in the recent past
struct timeval tv;
tv.tv_sec = 1715770351; // 15 May 2024, 8:50pm
if (reason == ESP_RST_DEEPSLEEP) {
return; // ESP-IDF preserves system time across deep sleep
}
// All other resets (power-on, crash, WDT, brownout) lose system time.
// Restore from RTC backup if valid, otherwise use hardcoded seed.
struct timeval tv;
if (_rtc_backup_magic == RTC_BACKUP_MAGIC && _rtc_backup_time > RTC_TIME_MIN) {
tv.tv_sec = _rtc_backup_time;
} else {
tv.tv_sec = RTC_TIME_MIN;
}
tv.tv_usec = 0;
settimeofday(&tv, NULL);
}
}
uint32_t getCurrentTime() override {
time_t _now;
time(&_now);
@@ -223,6 +234,16 @@ public:
tv.tv_sec = time;
tv.tv_usec = 0;
settimeofday(&tv, NULL);
_rtc_backup_time = time;
_rtc_backup_magic = RTC_BACKUP_MAGIC;
}
void tick() override {
time_t now;
time(&now);
if (now > RTC_TIME_MIN && (uint32_t)now != _rtc_backup_time) {
_rtc_backup_time = (uint32_t)now;
_rtc_backup_magic = RTC_BACKUP_MAGIC;
}
}
};