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SerialBuffer.cpp
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127 lines (96 loc) · 2.28 KB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Digital Voice Modem - Modem Firmware
* GPLv2 Open Source. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright (C) 2015,2016 Jonathan Naylor, G4KLX
* Serial FIFO Control Copyright (C) 2015 by James McLaughlin, KI6ZUM
*
*/
#include "SerialBuffer.h"
// ---------------------------------------------------------------------------
// Public Class Members
// ---------------------------------------------------------------------------
/* Initializes a new instance of the SerialBuffer class. */
SerialBuffer::SerialBuffer(uint16_t length) :
m_length(length),
m_buffer(NULL),
m_head(0U),
m_tail(0U),
m_full(false)
{
m_buffer = new uint8_t[length];
}
/* Finalizes a instance of the SerialBuffer class. */
SerialBuffer::~SerialBuffer()
{
delete[] m_buffer;
}
/* Helper to get how much space the ring buffer has for data. */
uint16_t SerialBuffer::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;
}
/* */
uint16_t SerialBuffer::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;
}
/* Helper to reset data values to defaults. */
void SerialBuffer::reset()
{
m_head = 0U;
m_tail = 0U;
m_full = false;
}
/* Helper to reset and reinitialize data values to defaults. */
void SerialBuffer::reinitialize(uint16_t length)
{
reset();
m_length = length;
delete[] m_buffer;
m_buffer = new uint8_t[length];
}
/* */
bool SerialBuffer::put(uint8_t c)
{
if (m_full)
return false;
m_buffer[m_head] = c;
m_head++;
if (m_head >= m_length)
m_head = 0U;
if (m_head == m_tail)
m_full = true;
return true;
}
/* */
uint8_t SerialBuffer::peek() const
{
return m_buffer[m_tail];
}
/* */
uint8_t SerialBuffer::get()
{
uint8_t value = m_buffer[m_tail];
m_full = false;
m_tail++;
if (m_tail >= m_length)
m_tail = 0U;
return value;
}