mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 19:54:39 +00:00
181 lines
5.5 KiB
C++
181 lines
5.5 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 "baseband_dma.hpp"
|
|
|
|
#include <cstdint>
|
|
#include <cstddef>
|
|
#include <array>
|
|
|
|
#include "hal.h"
|
|
#include "gpdma.hpp"
|
|
|
|
using namespace lpc43xx;
|
|
|
|
#include "portapack_dma.hpp"
|
|
|
|
namespace baseband {
|
|
namespace dma {
|
|
|
|
constexpr uint32_t gpdma_ahb_master_sgpio = 0;
|
|
constexpr uint32_t gpdma_ahb_master_memory = 1;
|
|
constexpr uint32_t gpdma_ahb_master_lli_fetch = 0;
|
|
|
|
constexpr uint32_t gpdma_src_peripheral = 0x0;
|
|
constexpr uint32_t gpdma_dest_peripheral = 0x0;
|
|
|
|
constexpr gpdma::channel::LLIPointer lli_pointer(const void* lli) {
|
|
return {
|
|
.lm = gpdma_ahb_master_lli_fetch,
|
|
.r = 0,
|
|
.lli = reinterpret_cast<uint32_t>(lli),
|
|
};
|
|
}
|
|
|
|
constexpr gpdma::channel::Control control(const baseband::Direction direction, const size_t buffer_words) {
|
|
return {
|
|
.transfersize = buffer_words,
|
|
.sbsize = 0, /* Burst size: 1 */
|
|
.dbsize = 0, /* Burst size: 1 */
|
|
.swidth = 2, /* Source transfer width: word (32 bits) */
|
|
.dwidth = 2, /* Destination transfer width: word (32 bits) */
|
|
.s = (direction == baseband::Direction::Transmit) ? gpdma_ahb_master_memory : gpdma_ahb_master_sgpio,
|
|
.d = (direction == baseband::Direction::Transmit) ? gpdma_ahb_master_sgpio : gpdma_ahb_master_memory,
|
|
.si = (direction == baseband::Direction::Transmit) ? 1U : 0U,
|
|
.di = (direction == baseband::Direction::Transmit) ? 0U : 1U,
|
|
.prot1 = 0,
|
|
.prot2 = 0,
|
|
.prot3 = 0,
|
|
.i = 1,
|
|
};
|
|
}
|
|
|
|
constexpr gpdma::channel::Config config(const baseband::Direction direction) {
|
|
return {
|
|
.e = 0,
|
|
.srcperipheral = gpdma_src_peripheral,
|
|
.destperipheral = gpdma_dest_peripheral,
|
|
.flowcntrl = (direction == baseband::Direction::Transmit)
|
|
? gpdma::FlowControl::MemoryToPeripheral_DMAControl
|
|
: gpdma::FlowControl::PeripheralToMemory_DMAControl,
|
|
.ie = 1,
|
|
.itc = 1,
|
|
.l = 0,
|
|
.a = 0,
|
|
.h = 0,
|
|
};
|
|
}
|
|
|
|
constexpr size_t buffer_samples_log2n = 13;
|
|
constexpr size_t buffer_samples = (1 << buffer_samples_log2n);
|
|
constexpr size_t transfers_per_buffer_log2n = 2;
|
|
constexpr size_t transfers_per_buffer = (1 << transfers_per_buffer_log2n);
|
|
constexpr size_t transfer_samples = buffer_samples / transfers_per_buffer;
|
|
constexpr size_t transfers_mask = transfers_per_buffer - 1;
|
|
|
|
constexpr size_t buffer_bytes = buffer_samples * sizeof(baseband::sample_t);
|
|
constexpr size_t transfer_bytes = transfer_samples * sizeof(baseband::sample_t);
|
|
|
|
constexpr size_t msg_count = transfers_per_buffer - 1;
|
|
|
|
static std::array<gpdma::channel::LLI, transfers_per_buffer> lli_loop;
|
|
static constexpr auto& gpdma_channel_sgpio = gpdma::channels[portapack::sgpio_gpdma_channel_number];
|
|
|
|
//static Mailbox mailbox;
|
|
//static std::array<msg_t, msg_count> messages;
|
|
static Semaphore semaphore;
|
|
|
|
static volatile const gpdma::channel::LLI* next_lli = nullptr;
|
|
|
|
static void transfer_complete() {
|
|
next_lli = gpdma_channel_sgpio.next_lli();
|
|
/* TODO: Is Mailbox the proper synchronization mechanism for this? */
|
|
//chMBPostI(&mailbox, 0);
|
|
chSemSignalI(&semaphore);
|
|
}
|
|
|
|
static void dma_error() {
|
|
disable();
|
|
}
|
|
|
|
void init() {
|
|
//chMBInit(&mailbox, messages.data(), messages.size());
|
|
chSemInit(&semaphore, 0);
|
|
gpdma_channel_sgpio.set_handlers(transfer_complete, dma_error);
|
|
|
|
// LPC_GPDMA->SYNC |= (1 << gpdma_src_peripheral);
|
|
// LPC_GPDMA->SYNC |= (1 << gpdma_dest_peripheral);
|
|
}
|
|
|
|
void configure(
|
|
baseband::sample_t* const buffer_base,
|
|
const baseband::Direction direction
|
|
) {
|
|
const auto peripheral = reinterpret_cast<uint32_t>(&LPC_SGPIO->REG_SS[0]);
|
|
const auto control_value = control(direction, gpdma::buffer_words(transfer_bytes, 4));
|
|
for(size_t i=0; i<lli_loop.size(); i++) {
|
|
const auto memory = reinterpret_cast<uint32_t>(&buffer_base[i * transfer_samples]);
|
|
lli_loop[i].srcaddr = (direction == Direction::Transmit) ? memory : peripheral;
|
|
lli_loop[i].destaddr = (direction == Direction::Transmit) ? peripheral : memory;
|
|
lli_loop[i].lli = lli_pointer(&lli_loop[(i + 1) % lli_loop.size()]);
|
|
lli_loop[i].control = control_value;
|
|
}
|
|
}
|
|
|
|
void enable(const baseband::Direction direction) {
|
|
const auto gpdma_config = config(direction);
|
|
gpdma_channel_sgpio.configure(lli_loop[0], gpdma_config);
|
|
|
|
//chMBReset(&mailbox);
|
|
chSemReset(&semaphore, 0);
|
|
|
|
gpdma_channel_sgpio.enable();
|
|
}
|
|
|
|
bool is_enabled() {
|
|
return gpdma_channel_sgpio.is_enabled();
|
|
}
|
|
|
|
void disable() {
|
|
gpdma_channel_sgpio.disable_force();
|
|
}
|
|
|
|
baseband::buffer_t wait_for_rx_buffer() {
|
|
//msg_t msg;
|
|
//const auto status = chMBFetch(&mailbox, &msg, TIME_INFINITE);
|
|
const auto status = chSemWait(&semaphore);
|
|
if( status == RDY_OK ) {
|
|
const auto next = next_lli;
|
|
if( next ) {
|
|
const size_t next_index = next - &lli_loop[0];
|
|
const size_t free_index = (next_index + transfers_per_buffer - 2) & transfers_mask;
|
|
return { reinterpret_cast<sample_t*>(lli_loop[free_index].destaddr), transfer_samples };
|
|
} else {
|
|
return { };
|
|
}
|
|
} else {
|
|
return { };
|
|
}
|
|
}
|
|
|
|
} /* namespace dma */
|
|
} /* namespace baseband */
|