mirror of
https://github.com/juribeparada/MMDVM_HS.git
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152 lines
3.2 KiB
C++
152 lines
3.2 KiB
C++
/*
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* Copyright (C) 2009-2018,2020,2021 by Jonathan Naylor G4KLX
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* Copyright (C) 2017 by Andy Uribe CA6JAU
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "Config.h"
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#include "Globals.h"
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#include "M17TX.h"
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#include "M17Defines.h"
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const uint8_t M17_SYNC = 0x77U;
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const uint8_t M17_PREAMBLE = 0x77U;
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CM17TX::CM17TX() :
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m_buffer(1500U),
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m_poBuffer(),
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m_poLen(0U),
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m_poPtr(0U),
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m_txDelay(240U), // 200ms
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m_delay(false)
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{
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}
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void CM17TX::process()
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{
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if (m_buffer.getData() == 0U && m_poLen == 0U)
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return;
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if (m_poLen == 0U) {
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if (!m_tx) {
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m_delay = true;
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m_poLen = m_txDelay;
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} else {
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m_delay = false;
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for (uint8_t i = 0U; i < M17_FRAME_LENGTH_BYTES; i++)
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m_poBuffer[m_poLen++] = m_buffer.get();
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}
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m_poPtr = 0U;
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}
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if (m_poLen > 0U) {
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uint16_t space = io.getSpace();
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while (space > 8U) {
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if (m_delay) {
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writeByte(M17_SYNC);
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m_poPtr++;
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} else
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writeByte(m_poBuffer[m_poPtr++]);
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space -= 8U;
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if (m_poPtr >= m_poLen) {
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if (m_delay) {
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m_delay = false;
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m_poPtr = 0U;
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m_poLen = 3U;
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} else {
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m_poPtr = 0U;
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m_poLen = 0U;
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m_delay = false;
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return;
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}
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}
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}
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}
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}
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uint8_t CM17TX::writeLinkSetup(const uint8_t* data, uint8_t length)
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{
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if (length != (M17_FRAME_LENGTH_BYTES + 1U))
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return 4U;
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uint16_t space = m_buffer.getSpace();
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if (space < M17_FRAME_LENGTH_BYTES)
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return 5U;
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for (uint8_t i = 0U; i < M17_FRAME_LENGTH_BYTES; i++)
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m_buffer.put(data[i + 1U]);
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return 0U;
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}
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uint8_t CM17TX::writeStream(const uint8_t* data, uint8_t length)
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{
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if (length != (M17_FRAME_LENGTH_BYTES + 1U))
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return 4U;
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uint16_t space = m_buffer.getSpace();
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if (space < M17_FRAME_LENGTH_BYTES)
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return 5U;
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for (uint8_t i = 0U; i < M17_FRAME_LENGTH_BYTES; i++)
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m_buffer.put(data[i + 1U]);
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return 0U;
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}
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uint8_t CM17TX::writeEOT()
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{
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uint16_t space = m_buffer.getSpace();
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if (space < M17_SYNC_LENGTH_BYTES)
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return 5U;
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for (uint8_t i = 0U; i < M17_SYNC_LENGTH_BYTES; i++)
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m_buffer.put(M17_EOF_SYNC_BYTES[i]);
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return 0U;
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}
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void CM17TX::writeByte(uint8_t c)
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{
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uint8_t bit;
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uint8_t mask = 0x80U;
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for (uint8_t i = 0U; i < 8U; i++, c <<= 1) {
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if ((c & mask) == mask)
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bit = 1U;
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else
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bit = 0U;
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io.write(&bit, 1);
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}
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}
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void CM17TX::setTXDelay(uint8_t delay)
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{
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m_txDelay = 600U + uint16_t(delay) * 12U; // 500ms + tx delay
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}
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uint8_t CM17TX::getSpace() const
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{
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return m_buffer.getSpace() / M17_FRAME_LENGTH_BYTES;
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}
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