Diff: rtc.cpp

Revision:

0:2df78a4443cd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtc.cpp	Sun Apr 10 15:47:33 2016 +1000
@@ -0,0 +1,60 @@
+#include "rtc.h"
+#include "DS1337.h"
+
+// declare reference to interface to the hardware real time clock
+extern DS1337* RTC_DS1337;
+
+// RTC enabled flag
+static int _rtcEnabled;
+
+time_t my_rtc_read()
+{
+    time_t  retval = 0;     // time since start of epoch
+    tm      _time_tm;
+
+    RTC_DS1337->readTime();
+
+    // extract values from RTC to tm struct
+    _time_tm.tm_year = ((int)RTC_DS1337->getYears()) - 1900;       // struct tm stores (year - 1900)
+    _time_tm.tm_mon  = (int)RTC_DS1337->getMonths() - 1;         // struct tm stores months 0 - 11, DS1337 stores 1-12
+    _time_tm.tm_mday = (int)RTC_DS1337->getDays();
+    _time_tm.tm_hour = (int)RTC_DS1337->getHours();
+    _time_tm.tm_min  = (int)RTC_DS1337->getMinutes();
+    _time_tm.tm_sec  = (int)RTC_DS1337->getSeconds();
+
+    // convert to time_t    
+    retval = mktime(&_time_tm);
+    if (retval == (time_t) -1)
+        return (time_t)1;               // error
+    else
+        return retval;
+}
+
+
+//https://developer.mbed.org/teams/Seeed/code/Seeed_Arch_GPRS_V2_RTC_HelloWorld/file/6db7dfbab0f1/main.cpp
+void my_rtc_write(time_t _time)
+{
+    // extract time_t to time info struct
+    tm * timeinfo = localtime(&_time);
+
+    RTC_DS1337->setSeconds   (timeinfo->tm_sec);
+    RTC_DS1337->setMinutes   (timeinfo->tm_min);
+    RTC_DS1337->setHours     (timeinfo->tm_hour);
+    RTC_DS1337->setDays      (timeinfo->tm_mday);           // day of month
+    RTC_DS1337->setDayOfWeek (timeinfo->tm_wday);
+    RTC_DS1337->setMonths    (timeinfo->tm_mon + 1);        // struct tm stores months 0 - 11, DS1337 stores 1-12
+    RTC_DS1337->setYears     (timeinfo->tm_year + 1900);    // struct tm subtracts 1900 from year
+
+    RTC_DS1337->setTime();
+}
+
+void my_rtc_init()
+{
+    RTC_DS1337->start();
+    _rtcEnabled = 1;
+}
+
+int my_rtc_enabled()
+{
+    return _rtcEnabled;
+}