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/*
* The MIT License (MIT)
*
* Copyright (c) 2020 Matthias P. Braendli
*
* 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 "relays.hpp"
#include "pins.hpp"
#include <stdio.h>
#include <math.h>
struct pending_event_t {
timer_t when;
relay_id_t relay;
bool set_not_reset;
bool level;
bool pending;
};
static constexpr uint32_t RELAY_SIGNAL_HOLD_TIME_US = 400000uL;
static constexpr size_t NUM_RELAYS = 3;
static constexpr size_t PENDING_EVENTS_SIZE = NUM_RELAYS * 2; // two events per relay at most
static pending_event_t pending_events[PENDING_EVENTS_SIZE];
void relays_init()
{
for (size_t i = 0; i < PENDING_EVENTS_SIZE; i++) {
pending_events[i].pending = false;
}
}
static void handle_event(pending_event_t& event)
{
switch (event.relay) {
case relay_id_t::K1:
if (event.level) {
PORTD |= (event.set_not_reset ? PIND_K1_SET : PIND_K1_RESET);
}
else {
PORTD &= (event.set_not_reset ? ~PIND_K1_SET : ~PIND_K1_RESET);
}
break;
case relay_id_t::K2:
if (event.level) {
PORTC |= (event.set_not_reset ? PINC_K2_SET : PINC_K2_RESET);
}
else {
PORTC &= (event.set_not_reset ? ~PINC_K2_SET : ~PINC_K2_RESET);
}
break;
case relay_id_t::K3:
if (event.level) {
PORTC |= (event.set_not_reset ? PINC_K3_SET : PINC_K3_RESET);
}
else {
PORTC &= (event.set_not_reset ? ~PINC_K3_SET : ~PINC_K3_RESET);
}
break;
}
event.pending = false;
}
void relays_handle(const timer_t& time_now)
{
for (size_t i = 0; i < PENDING_EVENTS_SIZE; i++) {
if (pending_events[i].pending and pending_events[i].when < time_now) {
handle_event(pending_events[i]);
}
}
}
bool relays_toggle(relay_id_t relay, bool set_not_reset, const timer_t& when)
{
size_t num_free_events = 0;
for (size_t i = 0; i < PENDING_EVENTS_SIZE; i++) {
if (not pending_events[i].pending) {
num_free_events++;
}
}
if (num_free_events < 2) {
return false;
}
for (size_t i = 0; i < PENDING_EVENTS_SIZE; i++) {
if (not pending_events[i].pending) {
pending_events[i].pending = true;
pending_events[i].relay = relay;
pending_events[i].when = when;
pending_events[i].level = true;
pending_events[i].set_not_reset = set_not_reset;
break;
}
}
for (size_t i = 0; i < PENDING_EVENTS_SIZE; i++) {
if (not pending_events[i].pending) {
pending_events[i].pending = true;
pending_events[i].relay = relay;
pending_events[i].when = when +
timer_t{0, RELAY_SIGNAL_HOLD_TIME_US};
pending_events[i].level = false;
pending_events[i].set_not_reset = set_not_reset;
break;
}
}
return true;
}
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