<p><b>@Former</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11258#discussion_r269473791">cpu/stm32_common/periph/rtc.c</a>:</p>
<pre style='color:#555'>> @@ -322,4 +329,257 @@ void ISR_NAME(void)
     cortexm_isr_end();
 }
 
+#elif defined(CPU_FAM_STM32F1)
+
+void rtc_init(void)
+{
+    DEBUG("[RTC rtc_init]\n");
+
+    // Enable APB1 clocks
+    RCC->APB1ENR |= RCC_APB1ENR_PWREN | RCC_APB1ENR_BKPEN;
+
+    // Disable backup domain write protection
+    PWR->CR |= PWR_CR_DBP;
+
+    if ((RCC->BDCR & RCC_BDCR_RTCEN) != RCC_BDCR_RTCEN) // if RTC clock disabled
</pre>
<p>After config RTC drop current time.<br>
Now rtc_init save current time. Config run always.</p>

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