circuitpython/supervisor/shared/autoreload.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft 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 "autoreload.h"
#include "py/mphal.h"
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#include "py/reload.h"
#include "supervisor/shared/tick.h"
supervisor_allocation* next_code_allocation;
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static volatile uint32_t autoreload_delay_ms = 0;
static bool autoreload_enabled = false;
static bool autoreload_suspended = false;
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volatile bool reload_requested = false;
inline void autoreload_tick() {
if (autoreload_delay_ms == 0) {
return;
}
if (autoreload_delay_ms == 1 && autoreload_enabled &&
!autoreload_suspended && !reload_requested) {
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mp_raise_reload_exception();
reload_requested = true;
supervisor_disable_tick();
}
autoreload_delay_ms--;
}
void autoreload_enable() {
autoreload_enabled = true;
reload_requested = false;
}
void autoreload_disable() {
autoreload_enabled = false;
}
void autoreload_suspend() {
autoreload_suspended = true;
}
void autoreload_resume() {
autoreload_suspended = false;
}
inline bool autoreload_is_enabled() {
return autoreload_enabled;
}
void autoreload_start() {
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// Enable ticks if we haven't been tracking an autoreload delay. We check
// our current state so that we only turn ticks on once. Multiple starts
// can occur before we reload and then turn ticks off.
if (autoreload_delay_ms == 0) {
supervisor_enable_tick();
}
autoreload_delay_ms = CIRCUITPY_AUTORELOAD_DELAY_MS;
}
void autoreload_stop() {
autoreload_delay_ms = 0;
reload_requested = false;
}
void autoreload_now() {
if (!autoreload_enabled || autoreload_suspended || reload_requested) {
return;
}
mp_raise_reload_exception();
reload_requested = true;
}