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libraries/Rtc_by_Makuna/src/RtcUtility.cpp

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+/*-------------------------------------------------------------------------
+RTC library
+
+Written by Michael C. Miller.
+
+I invest time and resources providing this open source code,
+please support me by dontating (see https://github.com/Makuna/Rtc)
+
+-------------------------------------------------------------------------
+This file is part of the Makuna/Rtc library.
+
+Rtc is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as
+published by the Free Software Foundation, either version 3 of
+the License, or (at your option) any later version.
+
+Rtc is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with Rtc.  If not, see
+<http://www.gnu.org/licenses/>.
+-------------------------------------------------------------------------*/
+
+#include <Arduino.h>
+#include "RtcUtility.h"
+
+uint8_t BcdToUint8(uint8_t val)
+{
+    return val - 6 * (val >> 4);
+}
+
+uint8_t Uint8ToBcd(uint8_t val)
+{
+    return val + 6 * (val / 10);
+}
+
+uint8_t BcdToBin24Hour(uint8_t bcdHour)
+{
+    uint8_t hour;
+    if (bcdHour & 0x40)
+    {
+        // 12 hour mode, convert to 24
+        bool isPm = ((bcdHour & 0x20) != 0);
+
+        hour = BcdToUint8(bcdHour & 0x1f);
+        if (isPm)
+        {
+           hour += 12;
+        }
+    }
+    else
+    {
+        hour = BcdToUint8(bcdHour);
+    }
+    return hour;
+}