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129 lines
2.3 KiB
129 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Digital Voice Modem - Hotspot Firmware
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright (C) 2015,2016 Jonathan Naylor, G4KLX
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* Serial FIFO Control Copyright (C) 2015 by James McLaughlin, KI6ZUM
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* Copyright (C) 2022 Bryan Biedenkapp, N2PLL
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*
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*/
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#include "SerialBuffer.h"
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/* Initializes a new instance of the SerialBuffer class. */
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SerialBuffer::SerialBuffer(uint16_t length) :
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m_length(length),
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m_buffer(NULL),
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m_head(0U),
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m_tail(0U),
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m_full(false)
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{
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m_buffer = new uint8_t[length];
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}
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/* Finalizes a instance of the SerialBuffer class. */
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SerialBuffer::~SerialBuffer()
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{
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delete[] m_buffer;
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}
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/* Helper to get how much space the ring buffer has for samples. */
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uint16_t SerialBuffer::getSpace() const
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{
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uint16_t n = 0U;
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if (m_tail == m_head)
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n = m_full ? 0U : m_length;
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else if (m_tail < m_head)
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n = m_length - m_head + m_tail;
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else
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n = m_tail - m_head;
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if (n > m_length)
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n = 0U;
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return n;
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}
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/* */
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uint16_t SerialBuffer::getData() const
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{
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if (m_tail == m_head)
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return m_full ? m_length : 0U;
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else if (m_tail < m_head)
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return m_head - m_tail;
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else
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return m_length - m_tail + m_head;
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}
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/* Helper to reset data values to defaults. */
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void SerialBuffer::reset()
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{
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m_head = 0U;
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m_tail = 0U;
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m_full = false;
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}
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/* Helper to reset and reinitialize data values to defaults. */
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void SerialBuffer::reinitialize(uint16_t length)
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{
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reset();
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m_length = length;
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delete[] m_buffer;
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m_buffer = new uint8_t[length];
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}
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/* */
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bool SerialBuffer::put(uint8_t c)
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{
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if (m_full)
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return false;
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m_buffer[m_head] = c;
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m_head++;
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if (m_head >= m_length)
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m_head = 0U;
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if (m_head == m_tail)
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m_full = true;
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return true;
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}
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/* */
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uint8_t SerialBuffer::peek() const
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{
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return m_buffer[m_tail];
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}
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/* */
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uint8_t SerialBuffer::get()
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{
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uint8_t value = m_buffer[m_tail];
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m_full = false;
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m_tail++;
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if (m_tail >= m_length)
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m_tail = 0U;
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return value;
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}
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