portapack-mayhem/firmware/baseband/stream_input.hpp
2016-05-09 21:05:11 +02:00

71 lines
2.0 KiB
C++

/*
* Copyright (C) 2016 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.
*/
#ifndef __STREAM_INPUT_H__
#define __STREAM_INPUT_H__
#include "message.hpp"
#include "fifo.hpp"
#include "lpc43xx_cpp.hpp"
using namespace lpc43xx;
#include <cstdint>
#include <cstddef>
#include <memory>
class StreamInput {
public:
StreamInput(CaptureConfig* const config) :
config { config },
K { config->write_size_log2 + config->buffer_count_log2 },
event_bytes_mask { (1UL << config->write_size_log2) - 1 },
data { std::make_unique<uint8_t[]>(1UL << K) },
fifo { data.get(), K }
{
config->fifo = &fifo;
}
size_t write(const void* const data, const size_t length) {
const auto written = fifo.in(reinterpret_cast<const uint8_t*>(data), length);
const auto last_bytes_written = bytes_written;
bytes_written += written;
if( (bytes_written & event_bytes_mask) < (last_bytes_written & event_bytes_mask) ) {
creg::m4txevent::assert();
}
config->baseband_bytes_received += length;
config->baseband_bytes_dropped = config->baseband_bytes_received - bytes_written;
return written;
}
private:
CaptureConfig* const config;
const size_t K;
const uint64_t event_bytes_mask;
uint64_t bytes_written = 0;
std::unique_ptr<uint8_t[]> data;
FIFO<uint8_t> fifo;
};
#endif/*__STREAM_INPUT_H__*/