mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-24 23:09:26 -05:00
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
|
|
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
|
|
*
|
|
* This file is part of PortaPack.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "message_queue.hpp"
|
|
|
|
#include "ch.h"
|
|
#include "lpc43xx_cpp.hpp"
|
|
|
|
using namespace lpc43xx;
|
|
|
|
bool MessageQueue::push(Message* const message) {
|
|
/* Returns true if success:
|
|
* - Message not in use.
|
|
* - FIFO wasn't full.
|
|
*/
|
|
if( message->state == Message::State::Free ) {
|
|
message->state = Message::State::InUse;
|
|
|
|
if( enqueue(message) ) {
|
|
signal();
|
|
return true;
|
|
} else {
|
|
// Roll back message state.
|
|
message->state = Message::State::Free;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
Message* MessageQueue::pop() {
|
|
/* TODO: Because of architecture characteristics, the two LSBs of the
|
|
* message pointer will always be 0. Other (non-pointer) message types
|
|
* could be encoded by setting these two bits to non-zero values.
|
|
* One of the bits could also be used as an "ack" flag... In fact, a
|
|
* pointer message could be turned into an "ack" message, or something
|
|
* like that...
|
|
* Might be better though to use formal operating structures in the
|
|
* message to do synchronization between processors.
|
|
*/
|
|
Message* message { nullptr };
|
|
const auto success = fifo.out(&message, 1);
|
|
return success ? message : nullptr;
|
|
}
|
|
|
|
#if defined(LPC43XX_M0)
|
|
bool MessageQueue::enqueue(Message* const message) {
|
|
return fifo.in(&message, 1);
|
|
}
|
|
|
|
void MessageQueue::signal() {
|
|
creg::m0apptxevent::assert();
|
|
}
|
|
#endif
|
|
|
|
#if defined(LPC43XX_M4)
|
|
bool MessageQueue::enqueue(Message* const message) {
|
|
return fifo.in(&message, 1);
|
|
}
|
|
|
|
void MessageQueue::signal() {
|
|
creg::m4txevent::assert();
|
|
}
|
|
#endif
|