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7802994854
* Move from .c to .h as needed for consistency. * When missing from both, copy from pull request or wiki. * When missing entirely, infer functionality from source code.
109 lines
4.4 KiB
C
109 lines
4.4 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2022 Mikhail Svarichevsky https://3.14.by/
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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 all
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* 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 THE
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* SOFTWARE.
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*/
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#ifndef NANOSEC_FACE_H_
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#define NANOSEC_FACE_H_
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/*
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* NANOSEC face
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*
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* The goal of nanosec face is dramatic improvement of SensorWatch accuracy.
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* Minimum goal is <60 seconds of error per year. Full success is if we can
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* reach <15 seconds per year (<0.47ppm error).
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*
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* Best used in conjunction with the FINETUNE face.
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*
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* It implements temperature correction using tempco from datasheet (and
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* allows to adjust these) and allows to introduce offset fix. Therefore
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* requires temperature sensor board.
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*
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* Most users will need to apply profile 3 ("default") or 2 ("conservative
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* datasheet"), and tune first parameter "static offset" (as it's different
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* for every crystal sample).
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*
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* Frequency correction is dithered over 31 correction intervals (31x10
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* minutes or ~5 hours), to allow <0.1ppm correction resolution.
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* * 1ppm is 0.0864 sec per day.
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* * 0.1ppm is 0.00864 sec per day.
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*
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* To stay under 1ppm error you would need calibration of your specific
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* instance of quartz crystal after some "burn-in" (ideally 1 year).
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*
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* Should improve TOTP experience.
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*
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* Default funing fork tempco: -0.034 ppm/°C², centered around 25°C
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* We add optional cubic coefficient, which was measured in practice on my sample.
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*
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* Cadence (CD) - how many minutes between corrections. Default 10 minutes.
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* Every minute might be too much. Every hour - slightly less power
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* consumption but also less precision.
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*
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* Can compensate crystal aging (ppm/year) - but you really should be worrying
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* about it on second/third years of watch calibration.
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*
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* For full usage instructions, please refer to the wiki:
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* https://www.sensorwatch.net/docs/watchfaces/nanosec/
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*/
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#include "movement.h"
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#define nanosec_profile_count 5
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typedef struct {
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// Correction profiles:
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// 0 - static hardware correction.
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// 1 - static correction with dithering.
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// 2 - datasheet quadratic correction (universal).
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// 3 - cubic correction conservative (likely universal).
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// 4 - cubic correction finetuned (sample-specific).
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int8_t correction_profile;
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int16_t freq_correction; // Static correction - multiplied by 100
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int16_t center_temperature; // Multiplied by 100, +25.0 -> +2500
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int16_t quadratic_tempco; // 0.034 -> 3400, multiplied by 100000. Stored positive, used as negative.
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int16_t cubic_tempco; // default 0, 0.000136 -> 1360, multiplied by 10000000. Stored positive, used positive.
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int8_t correction_cadence;
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uint32_t last_correction_time; // Not used at the moment - but will in the future
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int16_t aging_ppm_pa; // multiplied by 100. Aging per year.
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} nanosec_state_t;
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void nanosec_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
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void nanosec_face_activate(movement_settings_t *settings, void *context);
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bool nanosec_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
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void nanosec_face_resign(movement_settings_t *settings, void *context);
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bool nanosec_face_wants_background_task(movement_settings_t *settings, void *context);
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void nanosec_ui_save(void);
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void nanosec_save(void);
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float nanosec_get_aging(void);
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#define nanosec_face ((const watch_face_t) { \
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nanosec_face_setup, \
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nanosec_face_activate, \
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nanosec_face_loop, \
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nanosec_face_resign, \
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nanosec_face_wants_background_task, \
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})
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#endif // NANOSEC_FACE_H_
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