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