mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-09-21 00:26:12 +00:00
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "message_queue.hpp"
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#include "ch.h"
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#include "lpc43xx_cpp.hpp"
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using namespace lpc43xx;
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bool MessageQueue::push(Message* const message) {
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/* Returns true if success:
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* - Message not in use.
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* - FIFO wasn't full.
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*/
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if( message->state == Message::State::Free ) {
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message->state = Message::State::InUse;
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if( enqueue(message) ) {
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signal();
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return true;
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} else {
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// Roll back message state.
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message->state = Message::State::Free;
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}
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}
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return false;
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}
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Message* MessageQueue::pop() {
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/* TODO: Because of architecture characteristics, the two LSBs of the
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* message pointer will always be 0. Other (non-pointer) message types
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* could be encoded by setting these two bits to non-zero values.
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* One of the bits could also be used as an "ack" flag... In fact, a
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* pointer message could be turned into an "ack" message, or something
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* like that...
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* Might be better though to use formal operating structures in the
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* message to do synchronization between processors.
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*/
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Message* message { nullptr };
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const auto success = fifo.out(&message, 1);
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return success ? message : nullptr;
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}
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#if defined(LPC43XX_M0)
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bool MessageQueue::enqueue(Message* const message) {
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return fifo.in(&message, 1);
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}
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void MessageQueue::signal() {
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creg::m0apptxevent::assert();
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}
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#endif
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#if defined(LPC43XX_M4)
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bool MessageQueue::enqueue(Message* const message) {
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return fifo.in(&message, 1);
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}
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void MessageQueue::signal() {
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creg::m4txevent::assert();
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}
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#endif
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