circuitpython/ports/atmel-samd/common-hal/alarm/time/TimeAlarm.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Lucian Copeland for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/runtime.h"
#include "hpl/pm/hpl_pm_base.h"
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// #include <stdio.h>
// #include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/alarm/time/TimeAlarm.h"
#include "shared-bindings/time/__init__.h"
#include "supervisor/port.h"
STATIC volatile bool woke_up;
STATIC uint32_t deep_sleep_ticks;
void common_hal_alarm_time_timealarm_construct(alarm_time_timealarm_obj_t *self, mp_float_t monotonic_time) {
// TODO: throw a ValueError if the input time exceeds the maximum
// value of the Compare register. This must be calculated from the
// setup values in port.c. Should be ~3 days. Give it some margin.
//
// UPDATE: for deep sleep at least, it's far more than 3 days since
// prescalar is set to 1024. (2^32)/32 seconds so >1500 days?
self->monotonic_time = monotonic_time;
}
mp_float_t common_hal_alarm_time_timealarm_get_monotonic_time(alarm_time_timealarm_obj_t *self) {
return self->monotonic_time;
}
mp_obj_t alarm_time_timealarm_find_triggered_alarm(size_t n_alarms, const mp_obj_t *alarms) {
// TODO: this function currently assumes you can only have a single TimeAlarm
// If you want to support more, it will need to somehow detect which one went off.
for (size_t i = 0; i < n_alarms; i++) {
if (mp_obj_is_type(alarms[i], &alarm_time_timealarm_type)) {
return alarms[i];
}
}
return mp_const_none;
}
mp_obj_t alarm_time_timealarm_create_wakeup_alarm(void) {
alarm_time_timealarm_obj_t *timer = m_new_obj(alarm_time_timealarm_obj_t);
timer->base.type = &alarm_time_timealarm_type;
// TODO: Set monotonic_time based on the RTC state.
// Or don't, most of the other ports don't have this either.
timer->monotonic_time = 0.0f;
return timer;
}
void timer_callback(void) {
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RTC->MODE0.INTENCLR.reg = RTC_MODE0_INTENCLR_CMP1 | RTC_MODE0_INTENCLR_CMP0 | RTC_MODE0_INTENCLR_OVF; // clear flags
woke_up = true;
}
bool alarm_time_timealarm_woke_this_cycle(void) {
return woke_up;
}
void alarm_time_timealarm_reset(void) {
woke_up = false;
}
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void alarm_time_timealarm_set_alarms(bool deep_sleep, size_t n_alarms, const mp_obj_t *alarms) {
// Turn on debug control
RTC->MODE0.DBGCTRL.bit.DBGRUN = 1;
// Search through alarms for TimeAlarm instances, and check that there's only one
bool timealarm_set = false;
alarm_time_timealarm_obj_t *timealarm = MP_OBJ_NULL;
for (size_t i = 0; i < n_alarms; i++) {
if (!mp_obj_is_type(alarms[i], &alarm_time_timealarm_type)) {
continue;
}
if (timealarm_set) {
mp_raise_ValueError(translate("Only one alarm.time alarm can be set."));
}
timealarm = MP_OBJ_TO_PTR(alarms[i]);
timealarm_set = true;
}
if (!timealarm_set) {
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return;
}
// Compute how long to actually sleep, considering the time now.
mp_float_t now_secs = uint64_to_float(common_hal_time_monotonic_ms()) / 1000.0f;
uint32_t wakeup_in_secs = MAX(0.0f, timealarm->monotonic_time - now_secs);
uint32_t wakeup_in_ticks = wakeup_in_secs * 1024;
// In the deep sleep case, we can't start the timer until the USB delay has finished
// (otherwise it will go off while USB enumerates, and we'll risk entering deep sleep
// without any way to wake up again)
if (deep_sleep) {
deep_sleep_ticks = wakeup_in_ticks;
} else {
deep_sleep_ticks = 0;
}
// Set COMP1 for fake sleep. This will be reset for real deep sleep anyways.
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RTC->MODE0.COMP[1].reg = wakeup_in_ticks;
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while (RTC->MODE0.SYNCBUSY.reg) {
;
}
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// This is set for fake sleep. Max fake sleep time is ~72 hours
// True deep sleep isn't limited by this
port_interrupt_after_ticks(wakeup_in_ticks);
// TODO: set up RTC->COMP[1] and create a callback pointing to
// timer_callback. See atmel-samd/supervisor/port.c -> _port_interrupt_after_ticks()
// for how to set this up. I don't know how you do the callback, though. You MUST use
// COMP[1], since port.c uses COMP[0] already and needs to set that for
// things like the USB enumeration delay.
// If true deep sleep is called, it will either ignore or overwrite the above setup depending on
// whether it is shorter or longer than the USB delay
// printf("set deep alarm finished\n");
}
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void alarm_time_timealarm_prepare_for_deep_sleep(void) {
if (deep_sleep_ticks) {
// TODO: set up RTC->COMP[1] again, since it needs to start AFTER the USB enumeration delay.
// Just do the exact same setup as alarm_time_timealarm_set_alarms(). Note, this
// is used for both fake and real deep sleep, so it still needs the callback.
// See STM32 for reference.
// RTC->MODE0.COMP[1].reg = deep_sleep_ticks;
// while ((RTC->MODE0.SYNCBUSY.reg & (RTC_MODE0_SYNCBUSY_COMP1)) != 0) {
// }
deep_sleep_ticks = 0;
}
}