From faac7250697466428896e25a1d315e680b0e5ba5 Mon Sep 17 00:00:00 2001
From: Sander Speetjens <sander.speetjens@gmail.com>
Date: Sun, 25 Dec 2022 13:13:50 +0100
Subject: [PATCH] Add some comment headers in my libraries

---
 NTP/Core/Inc/Time.h                 |  6 ++++++
 NTP/Core/Inc/ds3231_for_stm32_hal.h |  8 +++++---
 NTP/Core/Src/Time.c                 | 13 ++++++++++---
 3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/NTP/Core/Inc/Time.h b/NTP/Core/Inc/Time.h
index 32a703c..bee4b76 100644
--- a/NTP/Core/Inc/Time.h
+++ b/NTP/Core/Inc/Time.h
@@ -2,6 +2,12 @@
 #include <stdint.h>
 #include "debug.h"
 
+/*
+ * TimeLib
+ * Based on the Time library by Michael Margolis (make and break time functions)
+ * Additions by: Sani7 (Sander Speetjens)
+*/
+
 // to transform a number of seconds into a current time you need to do some maths
 #define NUMBEROFSECONDSPERDAY 86400UL
 #define NUMBEROFSECONDSPERHOUR 3600UL
diff --git a/NTP/Core/Inc/ds3231_for_stm32_hal.h b/NTP/Core/Inc/ds3231_for_stm32_hal.h
index adb1ab4..a0ce435 100755
--- a/NTP/Core/Inc/ds3231_for_stm32_hal.h
+++ b/NTP/Core/Inc/ds3231_for_stm32_hal.h
@@ -1,7 +1,9 @@
 
-/* An STM32 HAL library written for the DS3231 real-time clock IC. */
-/* Based on a Library by @eepj www.github.com/eepj */
-/* Moddifications by Sani7 */
+/* An STM32 HAL library written for the DS3231 real-time clock IC.
+ * Based on a Library by @eepj www.github.com/eepj
+ * Moddifications by Sani7
+ */
+
 #ifndef DS3231_FOR_STM32_HAL_H
 #define DS3231_FOR_STM32_HAL_H
 #include "main.h"
diff --git a/NTP/Core/Src/Time.c b/NTP/Core/Src/Time.c
index 9f37644..514687d 100644
--- a/NTP/Core/Src/Time.c
+++ b/NTP/Core/Src/Time.c
@@ -1,5 +1,12 @@
 #include "Time.h"
 
+/*
+ * TimeLib
+ * Based on the Time library by Michael Margolis (make and break time functions)
+ * Additions by: Sani7 (Sander Speetjens)
+*/
+
+
 /**
  * @fn uint8_t IsDST(ts*)
  * @brief This function calculates if we are in EDST
@@ -14,13 +21,13 @@ uint8_t IsDST(ts *utc)
     // number of days of each month
     uint8_t days[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
-    // January, february, and december are out.
+    // November, December, January, february are out of DST.
     if (utc->Month < 3 || utc->Month > 10)
     {
         utc->IsDST = 0;
         return utc->IsDST;
     }
-    // April to september are in
+    // April to september are in DST
     if (utc->Month > 3 && utc->Month < 10)
     {
         utc->IsDST = 1;
@@ -32,7 +39,7 @@ uint8_t IsDST(ts *utc)
     days[1] -= (y % 4) || (!(y % 100) && (y % 400));
     d = days[m - 1];
 
-    /* dow is in normal format*/
+    // dow is in normal format
     nextSunday = days[m - 1] - ((d += m < 3 ? y-- : y - 2, 23 * m / 9 + d + 4 + y / 4 - y / 100 + y / 400) % 7);
     // Start: Last Sunday in March
     if (utc->Month == 3)