You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
147 lines
3.4 KiB
147 lines
3.4 KiB
/**
|
|
* Digital Voice Modem - DSP Firmware (Hotspot)
|
|
* GPLv2 Open Source. Use is subject to license terms.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* @package DVM / DSP Firmware (Hotspot)
|
|
*
|
|
*/
|
|
//
|
|
// Based on code from the MMDVM_HS project. (https://github.com/juribeparada/MMDVM_HS)
|
|
// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
|
|
//
|
|
/*
|
|
* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
|
|
* Serial FIFO Control Copyright (C) 2015 by James McLaughlin KI6ZUM
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
#include "BitBuffer.h"
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Public Class Members
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/// <summary>
|
|
/// Initializes a new instance of the BitBuffer class.
|
|
/// </summary>
|
|
BitBuffer::BitBuffer(uint16_t length) :
|
|
m_length(length),
|
|
m_bits(NULL),
|
|
m_control(NULL),
|
|
m_head(0U),
|
|
m_tail(0U),
|
|
m_full(false),
|
|
m_overflow(false)
|
|
{
|
|
m_bits = new uint8_t[length / 8U];
|
|
m_control = new uint8_t[length / 8U];
|
|
}
|
|
|
|
/// <summary>
|
|
/// Helper to get how much space the ring buffer has for samples.
|
|
/// </summary>
|
|
/// <returns></returns>
|
|
uint16_t BitBuffer::getSpace() const
|
|
{
|
|
uint16_t n = 0U;
|
|
|
|
if (m_tail == m_head)
|
|
n = m_full ? 0U : m_length;
|
|
else if (m_tail < m_head)
|
|
n = m_length - m_head + m_tail;
|
|
else
|
|
n = m_tail - m_head;
|
|
|
|
if (n > m_length)
|
|
n = 0U;
|
|
|
|
return n;
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <returns></returns>
|
|
uint16_t BitBuffer::getData() const
|
|
{
|
|
if (m_tail == m_head)
|
|
return m_full ? m_length : 0U;
|
|
else if (m_tail < m_head)
|
|
return m_head - m_tail;
|
|
else
|
|
return m_length - m_tail + m_head;
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <param name="c"></param>
|
|
/// <returns></returns>
|
|
bool BitBuffer::put(uint8_t bit, uint8_t control)
|
|
{
|
|
if (m_full) {
|
|
m_overflow = true;
|
|
return false;
|
|
}
|
|
|
|
_WRITE_BIT(m_bits, m_head, bit);
|
|
_WRITE_BIT(m_control, m_head, control);
|
|
|
|
m_head++;
|
|
if (m_head >= m_length)
|
|
m_head = 0U;
|
|
|
|
if (m_head == m_tail)
|
|
m_full = true;
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <returns></returns>
|
|
bool BitBuffer::get(uint8_t& bit, uint8_t& control)
|
|
{
|
|
if (m_head == m_tail && !m_full)
|
|
return false;
|
|
|
|
bit = _READ_BIT(m_bits, m_tail);
|
|
control = _READ_BIT(m_control, m_tail);
|
|
|
|
m_full = false;
|
|
|
|
m_tail++;
|
|
if (m_tail >= m_length)
|
|
m_tail = 0U;
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <returns></returns>
|
|
bool BitBuffer::hasOverflowed()
|
|
{
|
|
bool overflow = m_overflow;
|
|
m_overflow = false;
|
|
|
|
return overflow;
|
|
}
|