Set RTC clock if present

ThomasFarstrike · ThomasFarstrike · commit a2f583777f86 · 2026-04-10T14:57:56.000+02:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -12,7 +12,7 @@ Frameworks:
 
 OS:
 - LilyGo T-Watch S3 Plus: enable audio input (PDM microphone) and output (I2S speaker)
-- LilyGo T-Watch S3 Plus: get time from battery-powered Real Time Clock at startup
+- LilyGo T-Watch S3 Plus: enable battery-powered Real Time Clock to keep time
 - LilyGo T-Watch S3 Plus: add IMU accelerometer support so IMU app works
 
 
diff --git a/internal_filesystem/lib/mpos/board/lilygo_t_watch_s3_plus.py b/internal_filesystem/lib/mpos/board/lilygo_t_watch_s3_plus.py
@@ -228,6 +228,8 @@ def _handle_pmu_irq(_pin):
 rtc_tuple = (dt[0], dt[1], dt[2], dt[3], dt[4], dt[5], dt[6], 0)
 from machine import RTC
 RTC().datetime(rtc_tuple)
+from mpos import TimeZone
+TimeZone.rtc = rtc
 # Would be good to also do this:
 # rtc.setClockOutput(SensorPCF8563::CLK_DISABLE);   //Disable clock output to conserve backup battery power
 
diff --git a/internal_filesystem/lib/mpos/time.py b/internal_filesystem/lib/mpos/time.py
@@ -20,6 +20,13 @@ def sync_time():
         print('Syncing time with', ntptime.host)
         ntptime.settime()  # Fetch and set time (in UTC)
         print("Time sync'ed successfully")
+        if hasattr(TimeZone, "rtc"):
+            print("Real Time Clock (RTC) found, setting it")
+            try: # RTC driver might throw an exception
+                import time
+                TimeZone.rtc.datetime(time.localtime())
+            except Exception as e:
+                print(f"Exception while setting RTC time: {e}")
         TimeZone.refresh_timezone_preference() # if the time was sync'ed, then it needs refreshing
     except Exception as e:
         print('Failed to sync time:', e)
