[riot-notifications] [RIOT-OS/RIOT] cpu: RTC implementation for STM32F1 (#11258)

Former notifications at github.com
Wed Apr 10 12:30:18 CEST 2019

Former commented on this pull request.

> +}
+int rtc_set_alarm(struct tm *time, rtc_alarm_cb_t cb, void *arg)
+    /* enable global RTC interrupt */
+    if (cb && !NVIC_GetEnableIRQ(RTC_IRQn)) {
+        NVIC_EnableIRQ(RTC_IRQn);
+        DEBUG("%s enable RTC IRQ\n", __func__);
+    }
+    /* save callback and argument */
+    isr_ctx.cb = cb;
+    isr_ctx.arg = arg;
+    /* set wakeup time */
+    time_t timestamp = mktime(time);

I think that `cd` may be `NULL`. When `rtc_set_alarm()` use for wake up after standby callback not need.
Alarm time save in standby mode. In alarm time in past may encode several bytes data. It is possible to save several bytes in the standby mode. Maybe it can be useful for processor who do not have EEPROM.

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