mirror of
https://github.com/juribeparada/MMDVM_HS.git
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147 lines
3.1 KiB
C++
147 lines
3.1 KiB
C++
/*
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* Copyright (C) 2015,2016,2017,2018 by Jonathan Naylor G4KLX
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* Copyright (C) 2018 by Andy Uribe CA6JAU
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* Copyright (C) 2019 by Florian Wolters DF2ET
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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 "POCSAGTX.h"
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#include "POCSAGDefines.h"
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CPOCSAGTX::CPOCSAGTX() :
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m_buffer(1000U),
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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(POCSAG_PREAMBLE_LENGTH_BYTES),
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m_delay(false),
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m_cal(false)
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{
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}
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void CPOCSAGTX::process()
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{
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if (m_cal) {
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m_delay = false;
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createCal();
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}
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if (m_poLen == 0U && m_buffer.getData() > 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 < POCSAG_FRAME_LENGTH_BYTES; i++)
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m_poBuffer[i] = m_buffer.get();
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m_poLen = POCSAG_FRAME_LENGTH_BYTES;
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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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m_poPtr++;
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writeByte(POCSAG_SYNC);
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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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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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bool CPOCSAGTX::busy()
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{
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if (m_poLen > 0U || m_buffer.getData() > 0U)
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return true;
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else
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return false;
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}
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uint8_t CPOCSAGTX::writeData(const uint8_t* data, uint8_t length)
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{
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//if (length != POCSAG_FRAME_LENGTH_BYTES)
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//return 4U;
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uint16_t space = m_buffer.getSpace();
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if (space < POCSAG_FRAME_LENGTH_BYTES)
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return 5U;
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for (uint8_t i = 0U; i < POCSAG_FRAME_LENGTH_BYTES; i++)
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m_buffer.put(data[i]);
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return 0U;
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}
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void CPOCSAGTX::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 CPOCSAGTX::setTXDelay(uint8_t delay)
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{
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m_txDelay = POCSAG_PREAMBLE_LENGTH_BYTES + (delay * 3U) / 2U;
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if (m_txDelay > 150U)
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m_txDelay = 150U;
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}
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uint8_t CPOCSAGTX::getSpace() const
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{
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return m_buffer.getSpace() / POCSAG_FRAME_LENGTH_BYTES;
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}
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void CPOCSAGTX::setCal(bool start)
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{
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m_cal = start ? true : false;
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}
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void CPOCSAGTX::createCal()
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{
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// 600 Hz square wave generation
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for (unsigned int i = 0U; i < POCSAG_FRAME_LENGTH_BYTES; i++) {
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m_poBuffer[i] = 0xAAU;
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}
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m_poLen = POCSAG_FRAME_LENGTH_BYTES;
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m_poPtr = 0U;
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}
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