mirror of https://github.com/markqvist/MMDVM.git
102 lines
1.9 KiB
C++
102 lines
1.9 KiB
C++
/*
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Serial RB control - Copyright (C) KI6ZUM 2015
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Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "SerialRB.h"
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CSerialRB::CSerialRB(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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void CSerialRB::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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uint16_t CSerialRB::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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uint16_t CSerialRB::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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bool CSerialRB::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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uint8_t CSerialRB::peek() const
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{
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return m_buffer[m_tail];
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}
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uint8_t CSerialRB::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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