83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Nick Moore for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "lib/timeutils/timeutils.h"
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#include "shared-bindings/rtc/__init__.h"
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#include "supervisor/port.h"
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#include "supervisor/shared/translate.h"
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// This is the time in seconds since 2000 that the RTC was started.
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__attribute__((section(".uninitialized"))) static uint32_t rtc_offset[3];
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// These values are placed before and after the current RTC count. They are
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// used to determine if the RTC count is valid. These randomly-generated values
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// will be set when the RTC value is set in order to mark the RTC as valid. If
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// the system crashes or reboots, these values will remain undisturbed and the
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// RTC offset will remain valid.
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//
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// If Circuit Python is updated or these symbols shift around, the prefix and
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// suffix will no longer match, and the time will no longer be valid.
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#define RTC_OFFSET_CHECK_PREFIX 0x25ea7e2a
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#define RTC_OFFSET_CHECK_SUFFIX 0x2b80b69e
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void common_hal_rtc_init(void) {
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// If the prefix and suffix are not valid, zero-initialize the RTC offset.
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if ((rtc_offset[0] != RTC_OFFSET_CHECK_PREFIX) || (rtc_offset[2] != RTC_OFFSET_CHECK_SUFFIX))
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rtc_offset[1] = 0;
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}
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void common_hal_rtc_get_time(timeutils_struct_time_t *tm) {
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uint64_t ticks_s = port_get_raw_ticks(NULL) / 1024;
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timeutils_seconds_since_2000_to_struct_time(rtc_offset[1] + ticks_s, tm);
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}
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void common_hal_rtc_set_time(timeutils_struct_time_t *tm) {
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uint64_t ticks_s = port_get_raw_ticks(NULL) / 1024;
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uint32_t epoch_s = timeutils_seconds_since_2000(
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec
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);
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rtc_offset[1] = epoch_s - ticks_s;
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// Set the prefix and suffix in order to indicate the time is valid. This
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// must be done after the offset is updated, in case there is a crash or
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// power failure.
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rtc_offset[0] = RTC_OFFSET_CHECK_PREFIX;
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rtc_offset[2] = RTC_OFFSET_CHECK_SUFFIX;
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}
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int common_hal_rtc_get_calibration(void) {
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return 0;
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}
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void common_hal_rtc_set_calibration(int calibration) {
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mp_raise_NotImplementedError(translate("RTC calibration is not supported on this board"));
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}
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