91 lines
3.0 KiB
C
91 lines
3.0 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/shared/translate.h"
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#include "nrfx_rtc.h"
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#include "nrf_clock.h"
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// We clock the RTC very slowly (8Hz) so that it won't overflow often.
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// But the counter is only 24 bits, so overflow is about every 24 days ...
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// For testing, set this to 32768 and it'll overflow every few minutes
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#define RTC_CLOCK_HZ (8)
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volatile static uint32_t rtc_offset = 0;
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const nrfx_rtc_t rtc_instance = NRFX_RTC_INSTANCE(2);
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const nrfx_rtc_config_t rtc_config = {
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.prescaler = RTC_FREQ_TO_PRESCALER(RTC_CLOCK_HZ),
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.reliable = 0,
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.tick_latency = 0,
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.interrupt_priority = 6
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};
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void rtc_handler(nrfx_rtc_int_type_t int_type) {
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if (int_type == NRFX_RTC_INT_OVERFLOW) {
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rtc_offset += (1L<<24) / RTC_CLOCK_HZ;
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}
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}
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void rtc_init(void) {
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if (!nrf_clock_lf_is_running(NRF_CLOCK)) {
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nrf_clock_task_trigger(NRF_CLOCK, NRF_CLOCK_TASK_LFCLKSTART);
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}
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nrfx_rtc_counter_clear(&rtc_instance);
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nrfx_rtc_init(&rtc_instance, &rtc_config, rtc_handler);
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nrfx_rtc_enable(&rtc_instance);
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nrfx_rtc_overflow_enable(&rtc_instance, 1);
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}
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void common_hal_rtc_get_time(timeutils_struct_time_t *tm) {
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uint32_t t = rtc_offset + (nrfx_rtc_counter_get(&rtc_instance) / RTC_CLOCK_HZ );
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timeutils_seconds_since_2000_to_struct_time(t, tm);
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}
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void common_hal_rtc_set_time(timeutils_struct_time_t *tm) {
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rtc_offset = 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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nrfx_rtc_counter_clear(&rtc_instance);
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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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