added comment for Pinout

src/drivers/rtc.rs

@@ -1 +1,28 @@
 
+pub async fn rtc_config(i2c: I2c<'static, Async>) -> DS3231<I2c<'static, Async>> {
+    let mut rtc: DS3231<I2c<'static, Async>> = DS3231::new(i2c, RTC_ADDRESS);
+    let daily_alarm = Alarm1Config::AtTime {
+        hours: 0,   // set alarm every day 00:00:00 to sync time
+        minutes: 0,
+        seconds: 0,
+        is_pm: None, // 24-hour mode
+    };
+    if let Err(e) = rtc.set_alarm1(&daily_alarm).await {
+        error!("Failed to configure RTC: {:?}", e);
+        panic!();
+    }
+    rtc
+}
+
+pub async fn read_rtc_time<'a>(rtc: &'a mut DS3231<I2c<'static, Async>>) -> Result<u64, DS3231Error<esp_hal::i2c::master::Error>> {
+    match rtc.datetime().await {
+        Ok(datetime) => {
+            let utc_time = datetime.and_utc().timestamp() as u64;
+            Ok(utc_time)
+        }
+        Err(e) => {
+            error!("Failed to read RTC datetime: {:?}", e);
+            Err(e)
+        }
+    }
+}