Initial checkin

component/common/mbed/targets/hal/rtl8195a/rtc_api.c

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+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2015, Realtek Semiconductor Corp.
+ * All rights reserved.
+ *
+ * This module is a confidential and proprietary property of RealTek and
+ * possession or use of this module requires written permission of RealTek.
+ *******************************************************************************/
+#include "rtc_api.h"
+
+#if DEVICE_RTC
+#include <time.h>
+#include "timer_api.h"      // software-RTC: use a g-timer for the tick of the RTC
+
+#define SW_RTC_TIMER_ID        TIMER4
+
+static gtimer_t sw_rtc;
+static struct tm rtc_timeinfo;
+static int sw_rtc_en=0;
+
+const static u8 dim[14] = { 
+	31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 28 };
+
+static inline bool is_leap_year(unsigned int year)
+{
+	return (!(year % 4) && (year % 100)) || !(year % 400);
+}
+
+	
+static u8 days_in_month (u8 month, u8 year)
+{
+	u8 ret = dim [ month - 1 ];
+	if (ret == 0)
+		ret = is_leap_year (year) ? 29 : 28;
+	return ret;
+}	
+
+void sw_rtc_tick_handler(uint32_t id)
+{
+    if(++rtc_timeinfo.tm_sec > 59) {                               // Increment seconds, check for overflow
+        rtc_timeinfo.tm_sec = 0;                                   // Reset seconds
+        if(++rtc_timeinfo.tm_min > 59) {                           // Increment minutes, check for overflow
+            rtc_timeinfo.tm_min = 0;                               // Reset minutes
+            if(++rtc_timeinfo.tm_hour > 23) {                      // Increment hours, check for overflow
+                rtc_timeinfo.tm_hour = 0;                          // Reset hours
+                ++rtc_timeinfo.tm_yday;                            // Increment day of year
+                if(++rtc_timeinfo.tm_wday > 6)                     // Increment day of week, check for overflow
+                    rtc_timeinfo.tm_wday = 0;                      // Reset day of week
+                                                        // Increment day of month, check for overflow
+                if(++rtc_timeinfo.tm_mday >
+                    days_in_month(rtc_timeinfo.tm_mon, rtc_timeinfo.tm_year + 1900)) {
+                    rtc_timeinfo.tm_mday = 1;                      // Reset day of month
+                    if(++rtc_timeinfo.tm_mon > 11) {               // Increment month, check for overflow
+                        rtc_timeinfo.tm_mon = 0;                   // Reset month
+                        rtc_timeinfo.tm_yday = 0;                  // Reset day of year
+                        ++rtc_timeinfo.tm_year;                    // Increment year
+                    }                                   // - year       
+                }                                       // - month
+            }                                           // - day
+        }                                               // - hour
+    }                                     
+}
+
+void rtc_init(void)
+{
+    // Initial a periodical timer
+    gtimer_init(&sw_rtc, SW_RTC_TIMER_ID);
+    // Tick every 1 sec
+    gtimer_start_periodical(&sw_rtc, 1000000, (void*)sw_rtc_tick_handler, (uint32_t)&sw_rtc);
+    sw_rtc_en = 1;
+}
+
+void rtc_free(void)
+{
+    sw_rtc_en = 0;
+    gtimer_stop(&sw_rtc);
+    gtimer_deinit(&sw_rtc);
+}
+
+int rtc_isenabled(void)
+{
+    return(sw_rtc_en);
+}
+
+time_t rtc_read(void)
+{
+    time_t t;
+    
+    // Convert to timestamp
+    t = mktime(&rtc_timeinfo);
+
+    return t;
+}
+
+void rtc_write(time_t t)
+{
+    // Convert the time in to a tm
+    struct tm *timeinfo = localtime(&t);
+
+    if (timeinfo == NULL) {
+        // Error
+        return;
+    }
+    
+    gtimer_stop(&sw_rtc);
+
+    // Set the RTC
+    rtc_timeinfo.tm_sec = timeinfo->tm_sec;
+    rtc_timeinfo.tm_min = timeinfo->tm_min;
+    rtc_timeinfo.tm_hour = timeinfo->tm_hour;
+    rtc_timeinfo.tm_mday = timeinfo->tm_mday;
+    rtc_timeinfo.tm_wday = timeinfo->tm_wday;
+    rtc_timeinfo.tm_yday = timeinfo->tm_yday;
+    rtc_timeinfo.tm_mon = timeinfo->tm_mon;
+    rtc_timeinfo.tm_year = timeinfo->tm_year;
+
+    gtimer_start(&sw_rtc);    
+}
+
+#endif  // endof "#if DEVICE_RTC"