portapack-mayhem/firmware/common/gpdma.cpp
2015-07-08 08:39:24 -07:00

115 lines
2.6 KiB
C++

/*
* Copyright (C) 2014 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 "gpdma.hpp"
#include <array>
namespace lpc43xx {
namespace gpdma {
namespace {
struct ChannelHandlers {
TCHandler tc;
ErrHandler err;
constexpr ChannelHandlers(
) : tc(nullptr),
err(nullptr)
{
}
};
}
static std::array<ChannelHandlers, channels.size()> handlers_table { {} };
namespace channel {
void Channel::set_handlers(const TCHandler tc_handler, const ErrHandler err_handler) const {
handlers_table[number].tc = tc_handler;
handlers_table[number].err = err_handler;
}
void Channel::configure(
const LLI& first_lli,
const uint32_t config
) const {
disable_force();
clear_interrupts();
LPC_GPDMA_Channel_Type* const channel = &LPC_GPDMA->CH[number];
channel->SRCADDR = first_lli.srcaddr;
channel->DESTADDR = first_lli.destaddr;
channel->LLI = first_lli.lli;
channel->CONTROL = first_lli.control;
channel->CONFIG = config;
}
} /* namespace channel */
extern "C" {
LOCATE_IN_RAM
CH_IRQ_HANDLER(DMA_IRQHandler) {
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
const auto tc_stat = LPC_GPDMA->INTTCSTAT;
/* TODO: Service the higher channel numbers first, they're higher priority
* right?!?
*/
for(size_t i=0; i<handlers_table.size(); i++) {
if( (tc_stat >> i) & 1 ) {
if( handlers_table[i].tc ) {
handlers_table[i].tc();
}
}
}
LPC_GPDMA->INTTCCLR = tc_stat;
/* Test for *any* error first, before looping, since errors should be
* exceptional and we should spend as little time on them in the common
* case.
*/
const auto err_stat = LPC_GPDMA->INTERRSTAT;
if( err_stat ) {
for(size_t i=0; i<handlers_table.size(); i++) {
if( (err_stat >> i) & 1 ) {
if( handlers_table[i].err ) {
handlers_table[i].err();
}
}
}
LPC_GPDMA->INTERRCLR = err_stat;
}
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
}
} /* namespace gpdma */
} /* namespace lpc43xx */