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