rcttime.cpp: mutex param added

src/rtctime.cpp

@@ -46,14 +46,15 @@ uint8_t rtc_init(void) {
 
 } // rtc_init()
 
-uint8_t set_rtctime(time_t t) { // t is UTC in seconds epoch time
-  if (I2C_MUTEX_LOCK()) {
-    Rtc.SetDateTime(RtcDateTime(t - SECS_YR_2000)); // epoch -> sec2000
+uint8_t set_rtctime(time_t t, mutexselect_t mutex) { // t is sec epoch time
+  if (!mutex || I2C_MUTEX_LOCK()) {
 #ifdef RTC_INT // sync rtc 1Hz pulse on top of second
     Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeNone);  // off
     Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeClock); // start
 #endif
-    I2C_MUTEX_UNLOCK();
+    Rtc.SetDateTime(RtcDateTime(t - SECS_YR_2000)); // epoch -> sec2000
+    if (mutex)
+      I2C_MUTEX_UNLOCK();
     ESP_LOGI(TAG, "RTC time synced");
     return 1; // success
   } else {