118 lines
4.4 KiB
C
118 lines
4.4 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) 2021 Lucian Copeland 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 "py/runtime.h"
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#include "shared-bindings/alarm/time/TimeAlarm.h"
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#include "shared-bindings/time/__init__.h"
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#include "supervisor/port.h"
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#include "peripherals/rtc.h"
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#include STM32_HAL_H
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STATIC volatile bool woke_up;
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STATIC uint32_t deep_sleep_ticks;
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void common_hal_alarm_time_timealarm_construct(alarm_time_timealarm_obj_t *self, mp_float_t monotonic_time) {
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self->monotonic_time = monotonic_time;
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}
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mp_float_t common_hal_alarm_time_timealarm_get_monotonic_time(alarm_time_timealarm_obj_t *self) {
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return self->monotonic_time;
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}
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mp_obj_t alarm_time_timealarm_get_wakeup_alarm(size_t n_alarms, const mp_obj_t *alarms) {
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// First, check to see if we match
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for (size_t i = 0; i < n_alarms; i++) {
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if (mp_obj_is_type(alarms[i], &alarm_time_timealarm_type)) {
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return alarms[i];
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}
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}
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alarm_time_timealarm_obj_t *timer = m_new_obj(alarm_time_timealarm_obj_t);
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timer->base.type = &alarm_time_timealarm_type;
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// TODO: Set monotonic_time based on the RTC state.
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timer->monotonic_time = 0.0f;
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return timer;
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}
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// This is run in the timer task. We use it to wake the main CircuitPython task.
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STATIC void timer_callback(void) {
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woke_up = true;
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}
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bool alarm_time_timealarm_woke_us_up(void) {
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return woke_up;
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}
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void alarm_time_timealarm_reset(void) {
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woke_up = false;
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}
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void alarm_time_timealarm_set_alarms(bool deep_sleep, size_t n_alarms, const mp_obj_t *alarms) {
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// Search through alarms for TimeAlarm instances, and check that there's only one
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bool timealarm_set = false;
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alarm_time_timealarm_obj_t *timealarm = MP_OBJ_NULL;
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for (size_t i = 0; i < n_alarms; i++) {
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if (!mp_obj_is_type(alarms[i], &alarm_time_timealarm_type)) {
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continue;
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}
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if (timealarm_set) {
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mp_raise_ValueError(translate("Only one alarm.time alarm can be set."));
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}
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timealarm = MP_OBJ_TO_PTR(alarms[i]);
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timealarm_set = true;
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}
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if (!timealarm_set) {
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return;
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}
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// Compute how long to actually sleep, considering the time now.
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mp_float_t now_secs = uint64_to_float(common_hal_time_monotonic_ms()) / 1000.0f;
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uint32_t wakeup_in_secs = MAX(0.0f, timealarm->monotonic_time - now_secs);
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uint32_t wakeup_in_ticks = wakeup_in_secs * 1024;
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// In the deep sleep case, we can't start the timer until the USB delay has finished
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if (deep_sleep) {
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deep_sleep_ticks = wakeup_in_ticks;
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} else {
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deep_sleep_ticks = 0;
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}
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// Use alarm B, since port reserves A
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// If true deep sleep is called, it will either ignore or overwrite this depending on
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// whether it is shorter or longer than the USB delay
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stm32_peripherals_rtc_assign_alarm_callback(PERIPHERALS_ALARM_B,timer_callback);
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stm32_peripherals_rtc_set_alarm(PERIPHERALS_ALARM_B,wakeup_in_ticks);
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}
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void alarm_time_timealarm_prepare_for_deep_sleep(void) {
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if (deep_sleep_ticks) {
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// This is used for both fake and real deep sleep, so it still needs the callback
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stm32_peripherals_rtc_assign_alarm_callback(PERIPHERALS_ALARM_B,timer_callback);
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stm32_peripherals_rtc_set_alarm(PERIPHERALS_ALARM_B,deep_sleep_ticks);
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deep_sleep_ticks = 0;
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}
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}
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