mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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ae93d8ee58
Also saved 688 bytes of code.
165 lines
5.1 KiB
C++
165 lines
5.1 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 "baseband_dma.hpp"
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#include <cstdint>
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#include <cstddef>
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#include <array>
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#include "hal.h"
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#include "gpdma.hpp"
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using namespace lpc43xx;
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#include "portapack_dma.hpp"
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#include "thread_wait.hpp"
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namespace baseband {
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namespace dma {
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constexpr uint32_t gpdma_ahb_master_sgpio = 0;
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constexpr uint32_t gpdma_ahb_master_memory = 1;
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constexpr uint32_t gpdma_ahb_master_lli_fetch = 0;
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constexpr uint32_t gpdma_src_peripheral = 0x0;
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constexpr uint32_t gpdma_dest_peripheral = 0x0;
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constexpr gpdma::channel::LLIPointer lli_pointer(const void* lli) {
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return {
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.lm = gpdma_ahb_master_lli_fetch,
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.r = 0,
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.lli = reinterpret_cast<uint32_t>(lli),
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};
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}
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constexpr gpdma::channel::Control control(const baseband::Direction direction, const size_t buffer_words) {
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return {
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.transfersize = buffer_words,
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.sbsize = 0, /* Burst size: 1 */
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.dbsize = 0, /* Burst size: 1 */
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.swidth = 2, /* Source transfer width: word (32 bits) */
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.dwidth = 2, /* Destination transfer width: word (32 bits) */
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.s = (direction == baseband::Direction::Transmit) ? gpdma_ahb_master_memory : gpdma_ahb_master_sgpio,
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.d = (direction == baseband::Direction::Transmit) ? gpdma_ahb_master_sgpio : gpdma_ahb_master_memory,
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.si = (direction == baseband::Direction::Transmit) ? 1U : 0U,
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.di = (direction == baseband::Direction::Transmit) ? 0U : 1U,
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.prot1 = 0,
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.prot2 = 0,
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.prot3 = 0,
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.i = 1,
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};
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}
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constexpr gpdma::channel::Config config(const baseband::Direction direction) {
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return {
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.e = 0,
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.srcperipheral = gpdma_src_peripheral,
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.destperipheral = gpdma_dest_peripheral,
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.flowcntrl = (direction == baseband::Direction::Transmit)
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? gpdma::FlowControl::MemoryToPeripheral_DMAControl
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: gpdma::FlowControl::PeripheralToMemory_DMAControl,
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.ie = 1,
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.itc = 1,
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.l = 0,
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.a = 0,
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.h = 0,
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};
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}
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constexpr size_t buffer_samples_log2n = 13;
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constexpr size_t buffer_samples = (1 << buffer_samples_log2n);
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constexpr size_t transfers_per_buffer_log2n = 2;
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constexpr size_t transfers_per_buffer = (1 << transfers_per_buffer_log2n);
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constexpr size_t transfer_samples = buffer_samples / transfers_per_buffer;
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constexpr size_t transfers_mask = transfers_per_buffer - 1;
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constexpr size_t buffer_bytes = buffer_samples * sizeof(baseband::sample_t);
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constexpr size_t transfer_bytes = transfer_samples * sizeof(baseband::sample_t);
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constexpr size_t msg_count = transfers_per_buffer - 1;
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static std::array<gpdma::channel::LLI, transfers_per_buffer> lli_loop;
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static constexpr auto& gpdma_channel_sgpio = gpdma::channels[portapack::sgpio_gpdma_channel_number];
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static ThreadWait thread_wait;
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static void transfer_complete() {
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const auto next_lli_index = gpdma_channel_sgpio.next_lli() - &lli_loop[0];
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thread_wait.wake_from_interrupt(next_lli_index);
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}
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static void dma_error() {
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thread_wait.wake_from_interrupt(-1);
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disable();
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}
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void init() {
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gpdma_channel_sgpio.set_handlers(transfer_complete, dma_error);
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// LPC_GPDMA->SYNC |= (1 << gpdma_src_peripheral);
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// LPC_GPDMA->SYNC |= (1 << gpdma_dest_peripheral);
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}
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void configure(
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baseband::sample_t* const buffer_base,
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const baseband::Direction direction
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) {
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const auto peripheral = reinterpret_cast<uint32_t>(&LPC_SGPIO->REG_SS[0]);
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const auto control_value = control(direction, gpdma::buffer_words(transfer_bytes, 4));
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for(size_t i=0; i<lli_loop.size(); i++) {
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const auto memory = reinterpret_cast<uint32_t>(&buffer_base[i * transfer_samples]);
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lli_loop[i].srcaddr = (direction == Direction::Transmit) ? memory : peripheral;
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lli_loop[i].destaddr = (direction == Direction::Transmit) ? peripheral : memory;
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lli_loop[i].lli = lli_pointer(&lli_loop[(i + 1) % lli_loop.size()]);
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lli_loop[i].control = control_value;
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}
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}
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void enable(const baseband::Direction direction) {
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const auto gpdma_config = config(direction);
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gpdma_channel_sgpio.configure(lli_loop[0], gpdma_config);
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gpdma_channel_sgpio.enable();
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}
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bool is_enabled() {
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return gpdma_channel_sgpio.is_enabled();
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}
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void disable() {
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gpdma_channel_sgpio.disable();
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}
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baseband::buffer_t wait_for_rx_buffer() {
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const auto next_index = thread_wait.sleep();
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if( next_index >= 0 ) {
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const size_t free_index = (next_index + transfers_per_buffer - 2) & transfers_mask;
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return { reinterpret_cast<sample_t*>(lli_loop[free_index].destaddr), transfer_samples };
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} else {
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return { };
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}
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}
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} /* namespace dma */
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} /* namespace baseband */
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