Reduced time drift from 60s/day to 7s/day for ESP32-based repeaters with power saving.

Author: IoTThinks

examples/simple_repeater/main.cpp

@@ -152,10 +152,10 @@ void loop() {
 
   if (the_mesh.getNodePrefs()->powersaving_enabled && !the_mesh.hasPendingWork()) {
 #if defined(NRF52_PLATFORM)
-    board.sleep(1800); // nrf ignores seconds param, sleeps whenever possible
+    board.sleep(0); // nrf ignores seconds param, sleeps whenever possible
 #else
     if (the_mesh.millisHasNowPassed(POWERSAVING_FIRSTSLEEP_SECS * 1000)) { // To check if it is time to sleep
-      board.sleep(1800); // Sleep. Wake up after 30 minutes or when receiving a LoRa packet
+      board.sleep(30); // Sleep. Wake up after a while or when receiving a LoRa packet
     }
 #endif
   }

src/helpers/ESP32Board.h

@@ -69,18 +69,6 @@ class ESP32Board : public mesh::MainBoard {
       return;
     }
 
-    // Use more accurate clock in sleep
-#if SOC_RTC_SLOW_CLK_SUPPORT_RC_FAST_D256
-    if (rtc_clk_slow_src_get() != SOC_RTC_SLOW_CLK_SRC_RC_FAST) {
-
-      // Switch slow clock source to RC_FAST / 256 (~31.25 kHz)
-      rtc_clk_slow_src_set(SOC_RTC_SLOW_CLK_SRC_RC_FAST);
-
-      // Calibrate slow clock
-      esp_clk_slow_boot_cal(1024);
-    }
-#endif
-
     // Set GPIO wakeup
     gpio_num_t wakeupPin = (gpio_num_t)getIRQGpio();