start with RTC for G0

G0:G070/RTC/rtc.h

@@ -0,0 +1,36 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+// time, day of week (1 - monday), and date (1 - january)
+typedef struct{
+    uint8_t second;
+    uint8_t minute;
+    uint8_t hour;
+    uint8_t weekday;
+    uint8_t day;
+    uint8_t month;
+    uint8_t year;
+} rtc_t;
+
+void rtc_setup();
+
+void get_curtime(rtc_t *t);