diff --git a/srv/task.c b/srv/task.c
index 818a8b5..047fca1 100644
--- a/srv/task.c
+++ b/srv/task.c
@@ -26,6 +26,10 @@
 #include "task.h"
 #include "error.h"
 #include "../drv/stk.h"
+#include "../drv/pwr.h"
+#include "../drv/rcc.h"
+#include "../drv/bkp.h"
+#include "../drv/exti.h"
 
 
 //--local definitions-----------------------------------------------------------
@@ -51,7 +55,13 @@ static volatile uint32_t timestamp;
 void task_start_scheduler(void)
 {
 	stk_configure(1000, callback_stk);
-	//TODO: configure RTC
+
+	rcc_configure_lsi(true);
+	pwr_configure_bkp_write(true);
+	bkp_reset();
+	bkp_configure_rtc(1000, BKP_RTC_CLOCK_SRC_LSI, BKP_RTC_IRQ_NONE, nullptr);
+	pwr_configure_bkp_write(false);
+	exti_configure(EXTI_LINE_RTC, EXTI_CONFIG_RISING_EDGE, callback_rtc);
 
 	while (true) {
 		uint8_t triggers = stk_irq << 0 | rtc_irq << 1;
@@ -65,10 +75,13 @@ void task_start_scheduler(void)
 
 		if (stk_needed) {
 			stk_start();
-			__asm("wfi");
+			pwr_sleep();
 		} else {
+			pwr_configure_bkp_write(true);
+			bkp_set_rtc_alam(1);
+			pwr_configure_bkp_write(false);
 			stk_stop();
-			//TODO: enter deep sleep
+			pwr_sleep();
 		}
 	}
 }
@@ -158,4 +171,5 @@ static void callback_stk(void)
 static void callback_rtc(void)
 {
 	rtc_irq = true;
+	timestamp = bkp_read_rtc() * 1000;
 }