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-rw-r--r--os/various/chrtclib.c129
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-/*
- ChibiOS - Copyright (C) 2014 Uladzimir Pylinsky aka barthess
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-*/
-
-/**
- * @file chrtclib.c
- * @brief Time conversion routines.
- *
- * @addtogroup chrtclib
- * @{
- */
-
-#include <time.h>
-
-#include "chrtclib.h"
-
-/**
- * @brief Convert @p RTCDateTime to broken-down time structure.
- *
- * @param[in] timespec pointer to a @p RTCDateTime structure
- * @param[out] timp pointer to a broken-down time structure
- *
- * @api
- */
-void rtcConvertDateTimeToStructTm(const RTCDateTime *timespec,
- struct tm *timp) {
- uint32_t tmp;
-
- timp->tm_year = timespec->year + (1980 - 1900);
- timp->tm_mon = timespec->month - 1;
- timp->tm_mday = timespec->day;
- timp->tm_isdst = timespec->dstflag;
-
- tmp = timespec->millisecond / 1000;
- timp->tm_sec = tmp % 60;
- tmp -= timp->tm_sec;
- timp->tm_min = tmp % 3600;
- tmp -= timp->tm_min * 60;
- timp->tm_hour = tmp / 3600;
-}
-
-/**
- * @brief Convert broken-down time structure to @p RTCDateTime.
- *
- * @param[in] timp pointer to a broken-down time structure
- * @param[in] tv_msec milliseconds value
- * @param[out] timespec pointer to a @p RTCDateTime structure
- *
- * @api
- */
-void rtcConvertStructTmToDateTime(const struct tm *timp,
- uint32_t tv_msec, RTCDateTime *timespec) {
-
- timespec->year = timp->tm_year - (1980 - 1900);
- timespec->month = timp->tm_mon + 1;
- timespec->day = timp->tm_mday;
- timespec->dayofweek = timp->tm_wday + 1;
- if (-1 == timp->tm_isdst)
- timespec->dstflag = 0; /* set zero if dst is unknown */
- else
- timespec->dstflag = timp->tm_isdst;
- timespec->millisecond = tv_msec +
- (timp->tm_hour * 3600 + timp->tm_min * 60 + timp->tm_sec) * 1000;
-}
-
-/*
- * Lookup table for months' length
- */
-static const uint8_t month_len[12] = {
- 31, 30, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-};
-
-/**
- * @brief Get current time in format suitable for usage in FAT file system.
- * @note The information about day of week and DST is lost in DOS
- * format, the second field loses its least significant bit.
- *
- * @param[out] timespec pointer to a @p RTCDateTime structure
- * @return FAT date/time value.
- *
- * @api
- */
-uint32_t rtcConvertDateTimeToFAT(const RTCDateTime *timespec) {
- uint32_t fattime;
- uint32_t sec, min, hour, day, month, tmp;
-
- tmp = timespec->millisecond / 1000;
- sec = tmp % 60;
- min = (tmp - sec) % 3600;
- hour = (tmp - sec - min * 60) / 3600;
- day = timespec->day;
- month = timespec->month;
-
- /* handle DST flag */
- if (1 == timespec->dstflag) {
- hour += 1;
- if (hour == 24) {
- hour = 0;
- day += 1;
- if (day > month_len[month - 1]) {
- day = 1;
- month += 1;
- }
- }
- }
-
- fattime = sec >> 1;
- fattime |= min << 5;
- fattime |= hour << 11;
- fattime |= day << 16;
- fattime |= month << 21;
- fattime |= timespec->year << 25;
-
- return fattime;
-}
-
-/** @} */